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Changing dynamics of river ecosystem from aquatic to terrestrial: A case of Bhairab River, Jashore, Bangladesh

Watershed Ecology and the Environment 2023年第1期5卷 134-142页

作者： Anzum, Hassan Md. Naveed Shaibur, Molla Rahman Nahar, Nazneen Akber, Atika Hossain, Md. Sabbir Mamun, Shamim Al Laboratory of Soil and Water Analysis Department of Climate and Disaster Management Faculty of Applied Science and Technology Jashore University of Science and Technology Jashore 7408 Bangladesh Laboratory of Environmental Chemistry Department of Environmental Science and Technology Faculty of Applied Science and Technology Jashore University of Science and Technology Jashore 7408 Bangladesh Graduate School of Environmental Science Hokkaido University 5 Chome Jonishi Hokkaido Sapporo 060-0810 Japan Department of Environmental Science and Resource Management Mawlana Bhashani Science and Technology University Tangail 1902 Bangladesh

The changing dynamics of river ecosystems from aquatic to terrestrial in the Southwestern areas of Bangladesh have been widely observed in recent years. Nevertheless, there has been no consensus on whether the changes are caused by human activities or by natural processes. For a better understanding of the cause, this study was conducted based on a field survey through a pre-tested structured questionnaire measuring the river water quality. The water quality of the river was assessed to know how much the existing river water was affecting its aquatic ecosystem or not. People's perception was also investigated to assess the factors mostly responsible for changing the river ecosystem. It was found that the most responsible factors are human activities. Among them, the construction of cross embankments over and along the Bhairab River was the most (22%) responsible factor for changing the river ecosystem. The 2nd and 3rd most responsible factors were bridge construction (18%) and illegal encroachment (18%). Other reasons for changing the ecosystem of the river were the diversion (16%), cultivation of the riverside land (12%), the introduction of exotic species (8%), and disposal of wastes and industrial effluents into the river (6%), respectively. Besides, it is also believed that the construction of Farakka Barrage on the River Ganges (the mother of the Bhairab River) is also responsible for changing the aquatic ecosystem into a terrestrial ecosystem. © 2023 The Authors

关键词： Aquatic ecosystem Biodiversity Climate change Human activities South-west of Bangladesh

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n-Type Carbon Nanotubes Doped by Cross-Linked Organic Superbase for Stable Thermoelectric Materials

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Energy Material Advances 2024年第1期5卷 243-251页

作者： Mayuko Nishinaka Qingshuo Wei Yasuko Koshiba Shohei Horike Department of Chemical Science and Engineering Graduate School of EngineeringKobe UniversityKobe 657-8501Japan Nanomaterials Research Institute National Institute of Advanced Industrial Science and Technology(AIST)Tsukuba 305-8565Japan Graduate School of Pure and Applied Science University of Tsukuba1-1-1 TennodaiTsukuba 305-8577Japan Research Center for Membrane and Film Technology Kobe UniversityKobe 657-8501Japan Center for Environmental Management Kobe UniversityKobe 657-8501Japan

Carbon nanotubes(CNTs)are emerging as promising platforms for organic thermoelectric(TE)***,the poor stability of n-doped states often presents a problem for the long-term operation of p-n junction TE *** this study,we synthesized a cross-linked organic superbase,2TBD-C10,as a dopant to create n-type CNTs that are resistant to air,heat,and *** comparing the stability of 2TBD-C10-doped CNTs with those doped by a conventional superbase(TBD),we found that the enhanced stability could be attributed to the unique molecular structure of *** structure aids in effective adsorption on the CNT surfaces through multiple points,reduces volatility because of increased molecular weight,and suppresses water adsorption owing to the presence of hydrophobic alkyl *** results of our study demonstrate that tailoring the primary molecular structures of dopants can remarkably improve the stability of doped states in *** stable n-type materials were integrated into all-CNT TE modules,achieving good-to-excellent performance(power output of approximately 35μW from a temperature difference of approximately 65°C),making them suitable for powering wireless sensors and green light-emitting diodes.

关键词： p n junction modules carbon nanotubes thermoelectric materials organic superbase molecular structure hydrophobic alkyl chains carbon nanotubes cnts n type doping

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Simultaneous immobilization enhances synergistic interactions and crude oil removal of bacterial consortium

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Chemosphere 2023年第1期340卷 139934页

作者： Rungsihiranrut, Adisan Muangchinda, Chanokporn Naloka, Kallayanee Dechsakulwatana, Chutiwan Pinyakong, Onruthai International Postgraduate Programs in Hazardous Substance and Environmental Management Graduate School Chulalongkorn University Bangkok10330 Thailand Department of Microbiology Faculty of Science Chulalongkorn University Bangkok10330 Thailand Bangkok10330 Thailand Institute of Marine Science Burapha University Chonburi20131 Thailand

Oil spillage has serious adverse effects on marine environments. The degradation of crude oil by microorganisms may be an effective and sustainable approach. In this study, the removal of crude oil from seawater by immobilized bacterial consortium was performed and the enhancement of crude oil degradation efficiency by varying immobilization methods and inoculum volume ratio was examined. The nonpathogenic and heavy metal-tolerant bacterial consortium of Sphingobium naphthae MO2-4 and Priestia aryabhattai TL01-2 was immobilized by biofilm formation on aquaporousgels. The simultaneous immobilization of strains MO2-4 and TL01-2 showed better crude oil removal efficiency than independent immobilization, which indicated positive interactions among consortium members in the mixed-culture immobilized systems. Moreover, the immobilized consortium at a 2:1 (MO2-4:TL01-2) inoculum volume ratio showed the best crude oil removal capacity. The immobilized consortium removed 77% of 2000 mg L−1 crude oil in seawater over 7 days. The immobilized consortium maintained crude oil removal efficacy in semicontinuous experiments. In addition, the immobilized consortium was used to remediate seawater contaminated with 1000 mg L−1 crude oil in a 20 L wave tank. After 28 days, the crude oil degradation efficiency of immobilized consortium was approximately 70%, and crude oil degradation through natural attenuation was not observed. Moreover, the genomic features of strains MO2-4 and TL01-2 are reported. Genomic analyses of both strains confirmed the presence of many genes involved in hydrocarbon degradation, heavy metal resistance, biosurfactant synthesis, and biofilm formation, supporting the biodegradation results and characterizing strain properties. The results of this work introduce the potential benefit of simultaneous immobilization of bacterial consortia to improve efficiency of crude oil biodegradation and has motivated further investigations into large-scale remediation of crude

关键词： Bioremediation

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Effect of pH on arsenite (As³⁺) sorption on goethite: Kinetic and equilibrium experiments

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Case Studies in Chemical and environmental Engineering 2024年 9卷

作者： Thongmueang, Kunchalika Boonkaewwan, Satika Chotpantarat, Srilert Department of Geology Faculty of Science Chulalongkorn University Phayathai Road Bangkok 10330 Thailand International Postgraduate Programs in Environmental Management Graduate School Chulalongkorn University Bangkok 10330 Thailand Center of Excellence in Environmental Innovation and Management of Metals (EnvIMM) Environmental Research Institute Chulalongkorn University Phayathai Road Bangkok Pathumwan 10330 Thailand

Sorption on minerals significantly influences the fate and transport of arsenic (As) in subsurface environmental systems. In the study, goethite is widely utilized to remove both arsenate (As(V)) and arsenite (As(III)) species, was the focus. The objectives were to investigate the mechanism and reactions governing the transport of As(III) from the solution to the goethite surface and to evaluate the effects of different pH levels (4, 7, and 10) on its sorption. The sorption experiment evaluated various As(III) concentrations at different pH levels to determine the equilibrium time, while the kinetic experiment involved observing As sorption on goethite at these pH levels until equilibrium was reached. Physiochemical parameters, including pH, contact time, and initial As(III) concentration sorption capacity, were analyzed using Langmuir and Freundlich isotherms, along with pseudo-first and pseudo-second sorption kinetic models. Results showed that the maximum sorption capacity for As(III) was 2.17 mg/g at pH 7. The data fitted better with the Freundlich isotherm than with the Langmuir isotherm model across all pH levels (R² = 0.99 at pH 7). Although the separation factor (R_L) of the Langmuir model was between 0 and 1, indicating favorable sorption. The optimum contact time for As(III) was observed to be 360 mins at all tested pH levels. Kinetic data from As(III) sorption fitted well with the pseudo-second-order model (R² = 0.99), with the equilibrium rates (k₂) being 8.63, 6.08 and 6.48 g/mg⋅min−1 for pH levels 4, 7, and 10, respectively. In conclusion, this study revealed that a pH level of 7 is optimum for the sorption of As(III) from aqueous systems, positioning goethite as a viable As(III) sorbent for further investigation in acidic or alkaline environments. © 2023 The Authors

关键词： Adsorption isotherm Arsenite Goethite Kinetic sorption pH

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Preparation of thin films with densely aggregated zinc phthalocyanine nanowires oriented uniaxially on friction-transferred polytetrafluoroethylene template

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Discover Polymers 2025年第1期2卷 1-15页

作者： Chiyonobu, Yuki Koshiba, Yasuko Tomosada, Kana Matsumoto, Takuya Horike, Shohei Nishino, Takashi Ishida, Kenji Funahashi, Masahiro Department of Chemical Science and Engineering Graduate School of Engineering Kobe University Kobe Japan Research Center for Membrane and Film Technology Kobe University Kobe Japan Center for Environmental Management Kobe University Kobe Japan Department of Applied Quantum Physics and Nuclear Engineering Faculty of Engineering Kyushu University Fukuoka Japan

One-dimensional nanostructures of organic semiconductors exhibit distinctive optical and electrical properties. In this study, thin films containing densely aggregated, uniaxially oriented zinc phthalocyanine (ZnPc) nanowires are fabricated through vapor deposition on polytetrafluoroethylene (PTFE) friction-transferred films as orientation-inducing templates. The aggregation behavior of the ZnPc molecules depends on the substrate temperature (Ts) during deposition and the film thickness. Full-coverage aggregated ZnPc nanowires aligned parallel to the friction direction are formed in a film with a thickness of 20 nm deposited at Ts = 120 °C. Within the ZnPc nanowires, α-ZnPc crystals are aligned with the b-axis along the direction of nanowire growth and the a-axis perpendicular to the substrate. This indicates that the longitudinal direction of the ZnPc nanowires corresponds to the π‒π stacking direction of ZnPc molecules. A model detailing the growth of ZnPc nanowires on a PTFE film is proposed, elucidating the crystal growth and orientation through graphoepitaxial and epitaxial-like mechanisms. The PTFE friction-transferred film is demonstrated to be an effective template for the growth of aligned ZnPc nanowires. The uniaxially oriented, full-coverage ZnPc nanowire thin film fabricated on the PTFE template showed anisotropic electrical properties.

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Creating Thermally Stable P-Type Carbon Nanotubes Via Coordination Chemistry For Thermoelectric Materials

Creating Thermally Stable P-Type Carbon Nanotubes Via Coordi...

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Micro and Nanotechnology for Power Generation and Energy Conversion Applications (PowerMEMS)

作者： Kaho Kawasaki Yasuko Koshiba Kouki Akaike Qingshuo Wei Masahiro Funahashi Kenji Ishida Shohei Horike Department of Chemical Science and Engineering Graduate School of Engineering Kobe University JAPAN Research Center for Membrane and Film Technology Kobe University JAPAN Nanomaterials Research Institute National Institute of Advanced Industrial Science and Technology (AIST) JAPAN Graduate School of Pure and Applied Science University of Tsukuba JAPAN Department of Applied Quantum Physics and Nuclear Engineering Faculty of Engineering Kyushu University JAPAN Center for Environmental Management Kobe University Japan

ISBN: (数字)9798350380200

ISBN: (纸本)9798350380217

Carbon nanotube (CNT)-based thermoelectric (TE) materials have the potential to be used for the recovery of low-grade thermal energy. As TE devices are placed on heat sources, thermal stability of the materials-especially, retention ability of the doped states of CNTs- is one of the most important issues. Here, we show that the dopant selection via coordination chemistry allowed for establishing the stable p-doped CNTs lasting for more than 2 years at $100^{\circ} \mathrm{C}$ in air. Based on the less fluctuation of TE power factors of the doped CNTs, our results offer a promising avenue for creating CNT-based TE devices.

关键词： Reactive power Thermal expansion Thermoelectric materials Chemistry Power system stability Conductivity Carbon nanotubes Thermal sensors Thermal stability Thermal energy

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The Voices of Bako: Evaluating Resident Perceptions of Sarawak's National Park Using Best Worst Scaling

SSRN

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SSRN 2025年

作者： Onuma, Ayumi Kriskkumar, Karunanithi Tsuge, Takahiro Farhana, Huda Winnie, Akin Noordyana, Hassan Prasetyo, Nugroho Shinya, Numata Susumu, Takahashi Mufeng, Voon Muslim, Mohamad Graduate School of Economics Keio University Japan Graduate School of Global Environmental Studies Sophia University Japan Selangor Malaysia Sarawak Forestry Corporation Sarawak Malaysia Universiti Teknologi Malaysia Johor Malaysia Department of Geoinformation Faculty of Built Environment and Surveying Universiti Teknologi Malaysia Johor Malaysia Bachelor of Applied Science in Forest Management Vocational College Universitas Gadjah Mada Yogyakarta Indonesia Department of Tourism Science Tokyo Metropolitan University Tokyo Japan Graduate School of Urban Environmental Sciences Tokyo Metropolitan University Tokyo Japan Faculty of Economics Keio University Japan

This study examines the perceived benefits and concerns of native communities living near Bako National Park, Sarawak’s oldest national park, using the best–worst scaling (BWS) approach. This study aims to rank these perceptions and identify the sociodemographic influencing factors of these rankings, providing better insights into the community’s priorities. Using a Case-1 BWS design, the study ranks ecotourism and conservation-related benefits highly, while concerns such as confrontations with authorities and the loss of economic opportunities, particularly in fishing, are ranked as the most concerning. An in-depth analysis using a latent class conditional logit model revealed significant heterogeneity in community perceptions, with non-natives expressing greater concerns over social stability and economic well-being, whereas natives were more concerned about the potential loss of income from fishing and resource access limitations. These findings highlight the importance of engaging local communities in non-confrontational dialogues and tailoring conservation strategies to address their diverse needs and concerns. These results provide crucial insights for policymakers in developing countries seeking to expand their network of protected areas (PAs). © 2025, The Authors. All rights reserved.

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Three out of one: revising the species delimitation of the tree fern Gymnosphaera salletii (Cyatheaceae), with particular reference to the foliar nectary

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Botanical Journal of the Linnean Society 2024年第1期204卷 63-75页

作者： Li, Shu-Han Zuo, Zheng-Yu Chen, Cheng-Wei Pham, Van The Luu, Hong Truong Dong, Shi-Yong Key Laboratory of Plant Resources Conservation and Sustainable Utilization South China Botanical Garden Chinese Academy of Sciences Guangzhou 510650 China Guangdong Provincial Key Laboratory of Applied Botany South China Botanical Garden Chinese Academy of Sciences Guangzhou 510650 China University of Chinese Academy of Science Beijing 100049 China Germplasm Bank of Wild Species Kunming Institute of Botany Chinese Academy of Sciences Kunming 650201 China Biodiversity Program Taiwan International Graduate Program Academia Sinica National Taiwan Normal University Taipei 115 Taiwan Biodiversity Research Center Academia Sinica Taipei 115 Taiwan Department of Life Science National Taiwan Normal University Taipei 106 Taiwan Laboratory of Ecology and Environmental Management Science and Technology Advanced Institute Van Lang University Ho Chi Minh City Viet Nam Faculty of Applied Technology School of Technology Van Lang University Ho Chi Minh City Viet Nam Southern Institute of Ecology Vietnam Academy of Science and Technology Ho Chi Minh City Viet Nam

In Indochina the species diversity of Cyatheaceae remains insufficiently known. Here we demonstrate the scaly tree fern Gymnosphaera salletii in Vietnam to be an assemblage of three distinct species based on molecular and morphological data, and report for the first time the occurrence of foliar nectaries in Gymnosphaera. The true G. salletii is morphologically unique based on the protuberant glands present on the petiole. Gymnosphaera phankelocii sp. nov. and Gymnosphaera vietnamensis sp. nov. are recognized as new species;G. phankelocii is characterized by its distant two-rowed sori and G. vietnamensis by the sub-tripinnate fronds. Our phylogenetic analyses indicated that G. phankelocii is a relatively isolated species, while G. vietnamensis is a member of the G. salletii clade along with G. austroyunnanensis, G. salletii, and G. saxicola. The two new species and members of the G. salletii clade are all local endemics, and provide good examples to understand the frequent local endemics and their evolution in scaly tree ferns. Eleven species of Gymnosphaera are now known from Indochina;we provide a diagnostic key to these species. © The Author(s) 2023. Published by Oxford University Press on behalf of The Linnean Society of London. All rights reserved.

关键词： Indochina morphology new species phylogeny taxonomy

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Human health risk assessment of microbial contamination and trace metals in water and soils of Chileka Township, Blantyre, Malawi

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Discover Environment 2024年第1期2卷 1-24页

作者： Dzinjalamala, Gunseyo Dickson Kaonga, Chikumbusko Chiziwa Kumwenda, Save Kosamu, Ishmael Bobby Mphangwe Thulu, Fabiano Gibson Daud Chitete-Mawenda, Upile Makwinja, Rodgers Kanyerere, Thokozani Sakugawa, Hiroshi Malawi Bureau of Standards (MBS) Blantyre Malawi Malawi University of Business and Applied Sciences (MUBAS) Blantyre 3 Malawi Department of Geography Environmental Management and Energy Studies University of Johannesburg Auckland Park South Africa Department of Fisheries Ministry of Natural Resources & Climate Change Lilongwe Malawi University of the Western Cape Cape Town South Africa Graduate School of Biosphere Science Hiroshima University Higashi-Hiroshima Japan

This study assessed nutrients and microbial contamination in water and soil samples from Chileka Township, Blantyre City, Malawi. Elevated total and fecal coliforms (1300 cfu/100 mL and 290 cfu/100 mL) in groundwater (GW), and (34,000 cfu/100 mL and 8000 cfu/100 mL) in surface water (SW) were found, representing a risk of exposure to water-borne disease. While the criteria in the Malawi Standard for raw groundwater was mostly met, water from only 20% of the boreholes complied with the WHO requirements. Nitrate (NO3─) and Cl─ (47.8 mg/L and 263 mg/L) exceeded the WHO limits in GW. Cadmium (Cd) occurred in a few cases at concentrations up to 0.217 mg/L and 0.138 mg/L in GW and SW. Lead (Pb) and Cr were below detection limits, while Mn (0.319 mg/L and 0.640 mg/L) in GW and SW, and Fe (6.92 mg/L) in SW compromised taste. Though bacteriologically unfit for raw consumption by humans, both GW and SW chemically met FAO-acceptable limits for irrigation, and standards for livestock watering. The NO3─ and PO43─ maximum concentrations in soil were 58.9 mg/kg and 506 mg/kg, respectively. Lead (Pb) and Cd were not detected whereas Cr, Zn, Cu, Mn and Fe in soil were 27.7 mg/kg, 190 mg/kg, 60.4 mg/kg, 1307 mg/kg and 6552 mg/kg, respectively. Magnesium (Mg), Ca, Na and K were 20,523 mg/kg, 22,334 mg/kg, 544 mg/kg and 5758 mg/kg, respectively in soil. The human health risk assessment results, on the other hand, showed that at least 30% (6 out of 20) of the GW samples and 60% (3 out 8) of the SW samples had HI > 1 for adults, children and infants, indicating existence of non-carcinogenic risk. Similarly, at least 15% (3 out 20) of the GW samples and 18% (1 out of 8) of the SW samples had CR > 0.001 for adults, children and infants, suggesting a risk of developing cancer during a lifetime due to Cd exposure. Though both GW and SW are generally of good

关键词： Fecal coliforms Groundwater Likhubula River Microbial contamination Nutrients Trace metals

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Boosting methanol electro-oxidation to formate by trace iron induced suppression of cobalt(IV) formation

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Nano Research 2025年第5期18卷 230-239页

作者： Lin, Jialong Wang, Xinlin Cheng, Bingxue Zhou, Ruiheng Li, Yuhang Ishida, Tamao Xiu, Guangli Murayama, Toru Lin, Mingyue State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process Shanghai Environmental Protection Key Laboratory on Environmental Standard and Risk Management of Chemical Pollutants School of Resources and Environmental Engineering East China University of Science and Technology Shanghai200237 China School of Materials Science and Engineering East China University of Science and Technology Shanghai200237 China Department of Applied Chemistry for Environment Graduate School of Urban Environmental Sciences Tokyo Metropolitan University Tokyo192-0397 Japan Institute for Catalysis Hokkaido University Hokkaido 001-0021 Japan Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

Converting methanol to high-value formate through electrochemical methods can significantly reduce the energy consumption associated with conventional production processes. In this study, we directly synthesized iron-doped cobalt phosphate (Fe-CoPO) on nickel foam (NF) to achieve excellent activity for the methanol electro-oxidation reaction (MOR). Our results demonstrated that Fe-CoPO produced a current density of 100 mA·cm−2 at a significantly low operating potential of 1.436 V (vs. reversible hydrogen electrode (RHE)) and operated steadily for 16 h at this current density with a Faradaic efficiency (FE) of 97%. Furthermore, Fe-CoPO maintained a high FE of 100% even at an extremely high current density of 300 mA·cm−2 for 8 h. We found that the high MOR activity of Fe-CoPO results from electrochemical reconstruction to generate the Co2+/3+–O bond. The heterogeneous interface between Fe and Co inhibits the formation of Co4+, which significantly enhances the MOR activity. Thus, this work not only provides insights into the mechanism of MOR over Co-based catalysts but also offers a novel direction for developing highly active MOR catalysts. © The Author(s) 2025.

关键词： Electrochemical oxidation

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