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Effects of carbon-silicon structure on photochemical activity of biochars

Chemosphere 2024年 347卷 140719页

作者： Guo, Siwei Lu, Lun Chen, Baoliang Department of Environmental Science Zhejiang University Hangzhou310058 China Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control Hangzhou310058 China State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment South China Institute of Environmental Sciences Ministry of Ecology and Environment Guangzhou510655 China

Biochar has raised increasing concerns because of its great environmental impacts. It is known that the photocatalytic property of biochar is related to its carbon component and dissolved black carbon, but the effect of silicon component is ignored, and the effect of silicon and carbon phases was far less studied. This study systematically explored the photochemistry of silicon-rich and silicon-deficient biochar under light irradiation by using hexavalent chromium (Cr(VI)) and sulfadiazine as representative pollutants for photoreduction and photooxidation, respectively. It was found that biochar had photoreduction activity under the enhancement of electron donors, and 80.1% Cr(VI) can be removed by biochar with crystalline silicon and carbon (i.e., RH900) after 12 h irradiation. Meanwhile after low temperature pyrolysis, biochar with amorphous silicon and carbon (i.e., RH600) had great photooxidation capacity, and 71.90% organic pollutant was degraded within 24 h. The reaction was illustrated by transient photocurrent response, and hydroxyl radical generation measurement, and other tests. A new photochemical mechanism of the synergy between silicon and carbon model was proposed to elucidate the redox reactions of pollutants under the light. Graphitic carbon or crystalline silicon formed under high temperature played a role of valence band which was excited under light irradiation and the effect of electron donors to benefit photoreduction, while amorphous silicon formed under low temperature facilitated photooxidation process by increasing reactive oxygen species concentration. This study provided a gist for biochar production and application in the field of photocatalysis, and contributed to the broader understanding of biochar geochemical behavior in natural sunlit system. © 2023 Elsevier Ltd

关键词： Photooxidation

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A Comparative Study on Aggregation and Sedimentation of Natural Goethite and Artificial Fe3o4 Nanoparticles in Synthetic and Natural Waters

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SSRN 2022年

作者： Wu, Aiming Zhao, Xiaoli Yang, Chunyan Wang, Junyu Wang, Xia Liang, Weigang Zhou, Lingfeng Teng, Miaomiao Niu, Lin Tang, Zhi Hou, Guoqing Wu, Fengchang College of Environment Hohai University Nanjing210098 China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing100012 China State Environment Protection Key Laboratory of Regional Eco-Process and Function Assessment Chinese Research Academy of Environmental Sciences Beijing100012 China

Natural iron oxides nanomaterials have important roles in biogeochemical processes. In this study, the effects of pH, natural organic matter, and cations on aggregation and sedimentation of natural goethite and artificial Fe3O4 nanoparticles in water were investigated to learn more about the environmental behaviors of engineered and natural nanomaterials and how they differ. In addition, a novel extended DLVO theory that considered steric, gravitational, and magnetic attraction forces concurrently was specifically developed to provide mechanisms explanations. Specifically, Fe3O4 NPs were more likely than bulk goethite to aggregate (because of magnetic attraction interactions) at low HA concentrations and disperse at high HA concentrations. Besides, goethite was less prone to settle with the same concentration of NaCl than Fe3O4 NPs, but the opposite trend was found for the same concentration of CaCl2 because of the difference in maximum net energy (barrier) and strong Ca2+ bridging effectiveness of goethite in CaCl2 solution. Statistical models were established to evaluate colloidal stability of the particles. XPS and molecular dynamics simulation results suggested that ions were adsorbed onto particles via ionic polarization and that the binding free energies at high coverage followed the order Ca2+ > Na+ > Cl- and presence of cation bridging between particles. © 2022, The Authors. All rights reserved.

关键词： Positive ions

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Dynamics of Phosphorus Content in the Water-Sediment Interface of Wetlands in a Mid-Temperature Steppe

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Water environment Research 2024年 2019 Feb 10页

作者： He, Jing Su, Derong Lv, Shihai Diao, Zhaoyan Bu, He Zheng, Zhiron Ye, Shengxing State Environmental Protection Key Laboratory of Regional Eco-Process and Function Assessment Chinese Research Academy of Environmental Sciences Beijing100012 China Grassland Resources and Ecology Research Center Beijing Forestry University Beijing100083 China Huihe National Nature Reserve Authority in Inner Mongolia Hailar021199 China

In order to reveal dynamics changes in phosphorus release from the sediments of wetlands in a mid-temperature steppe without external phosphorus input, the relationship between phosphorus content in the overlying water, sediment, and interstitial water was studied using the variables control method. The results showed that, during the incubation period, the content of total phosphorus in the overlying water and the content of total phosphorus in interstitial water both presented in the order of August > September > July. Furthermore, the correlation relationships between phosphorus content in the overlying water, total phosphorus in the interstitial water, and the ratios of sediment Olsen-P to total phosphorus in the interstitial water, indicated that Olsen-P might be a kind of release form of phosphorus - from the sediment to the overlying water of the wetlands in Hulunbeier steppe, without external phosphorus input. This article is protected by copyright. All rights reserved. This article is protected by copyright. All rights reserved.

关键词： Water content

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Redevelopment of urban brownfield sites in China:Motivation,history,policies and improved management

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Eco-environment & Health 2022年第2期1卷 63-72页

作者： Yiming Sun Hong Li Shuo Lei Kirk TSemple Frederic Coulon Qing Hu Jingyang Gao Guanlin Guo Qingbao Gu Kevin C.Jones State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences100012BeijingPR China Lancaster Environment Centre(LEC) Lancaster UniversityLancasterLA14YQUK Centre for Ecology and Hydrology Library AvenueBailriggLancaster LA14APUK State Environmental Protection Key Laboratory of Regional Eco-process and Function Assessment Chinese Research Academy of Environmental Sciences100012BeijingPR China School of Water Energy and EnvironmentCranfield UniversityMK430ALUK Southern University of Science and Technology 518055ShenzhenGuangdongPR China Beijing Huanding Environmental Big Data Institute 100083BeijingPR China Technical Centre for Soil Agricultural and Rural Ecology and EnvironmentMinistry of Ecology and Environment100012BeijingPR China

Rapid urbanisation in China has resulted in an increased demand for land in towns and *** upgrade and modernise,China has also moved many major industries from urban centres to less populated *** the high economic value of urban land,the transformation and utilisation of brownfield areas have become important economically and *** Chinese government has recognised the need for strong frameworks to safeguard soil and groundwater quality,with brownfield sites a key category for *** scientific,regulatory and decision-making frameworks are needed and being adopted to ensure practical,careful and wise use of central and localised government resources,to manage the reuse and regeneration of these brownfield *** paper reviews the context,policies and management procedures of developing brownfield sites in countries with a history of brownfield management and discusses China’s current situation and priorities for brownfield governance and *** include(1)clarification of brownfield site soil contamination risk control standards and risk assessment procedures,(2)the responsibilities of different national and local agencies,(3)the establishment of a national expert committee to advise on best practices,policy and process,(4)the use of registered brownfield databases at national,provincial,municipal and county levels,and(5)the set up of soil pollution prevention fund at the provincial level.

关键词： Brownfield Urban soils Management China USA UK

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Ceratopteris chunii and Ceratopteris chingii(Pteridaceae),two new diploid species from China,based on morphological,cytological,and molecular data

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Plant Diversity 2022年第3期44卷 300-307页

作者： Jun-Hao Yu Rui Zhang Qiao-Ling Liu Fa-Guo Wang Xun-Lin Yu Xi-Ling Dai Yong-Bo Liu Yue-Hong Yan Eastern China Conservation Centre for Wild Endangered Plant Resources Shanghai Chenshan Botanical GardenShanghai 201602China College of Life Science Shanghai Normal UniversityShanghai200234China Shenzhen Key Laboratory for Orchid Conservation and Utilization National Orchid Conservation Center of China and the Orchid Conservation&Research Center of ShenzhenShenzhen518114China Guangdong Provincial Key Laboratory of Applied Botany South China Botanical GardenChinese Academy of SciencesGuangzhou510650China College of Forestry Central South University of Forestry&TechnologyChangshaHunan410004China State Environmental Protection Key Laboratory of Regional Eco-process and Function Assessment Chinese Research Academy of Environmental SciencesBeijing100012China

Understanding how natural hybridization and polyploidizations originate in plants requires identifying potential diploid ***,cryptic plant species are widespread,particularly in Ceratopteris(Pteridaceae).Identifying Ceratopteris cryptic species with different polyploidy levels is a challenge because Ceratopteris *** high degrees of phenotypic ***,two new cryptic species of Ceratopteris,Ceratopteris chunii and Ceratopteris chingii,are described and *** analyses reveal that each of the new species form a well-supported *** and *** are similar to Ceratopteris gaudichaudii *** and ***,respectively,but distinct from their relatives in the stipe,basal pinna of the sterile leaf or subelliptic shape of the fertile leaf,as well as the spore *** addition,chromosome studies indicate that *** and *** are both *** findings will help us further understand the origin of Ceratopteris polyploids in Asia.

关键词： Ceratopteris Phylogeny Chromosome Taxonomy Cryptic species

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Biodiversity conservation in China:A review of recent studies and practices

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environmental Science and Ecotechnology 2020年第2期2卷 30-39页

作者： Wei Wang Chunting Feng Fangzheng Liu Junsheng Li State Key Laboratory of Environmental Criteria and Risk Assessment State Environmental Protection Key Laboratory of Regional Eco-process and Function AssessmentChinese Research Academy of Environmental SciencesBeijing100012China Biodiversity Research Center Chinese Research Academy of Environmental SciencesBeijing100012China

Biodiversity conservation plays an important role in the sustainable development of human *** had made significant progress in biodiversity conservation studies and *** paper reviews major achievements in China in the past decades,especially those since *** terms of the science behind biodiversity conservation,Chinese scholars have made significant contributions to priority research subjects,including mechanisms for maintaining biological communities and the relationship between biodiversity and ecosystem ***,biodiversity conservation and management systems specific to China have been basically *** Chinese Government and researchers have undertaken a number of investigations,scientific studies,and monitoring,and have established relevant *** efforts taken to protect and restore biodiversity and ecosystems,the concept of biodiversity has gradually become popular in *** review is an attempt to share with the world the learning from China’s progress towards becoming an ecological civilization and highlights that the efforts towards biodiversity conservation need to be organically integrated with sustainable development goals.

关键词： Ecological civilization Mainstreaming Mobile supervising system Sustainable development Protected areas

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Full-scale studies are closer to reality than lab-scale ones: Tertiary treatment constructed wetlands maintain robust removal capability for pharmaceuticals and personal care products in cold weather conditions

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Bioresource Technology 2025年 432卷 132661页

作者： Wang, Jiaxi Ye, Beibei Yu, Xia Yan, Ruiqi Lin, Hui Man, Ying Sui, Qian State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process School of Resources and Environmental Engineering East China University of Science and Technology Shanghai200237 China Beijing100015 China School of Chemistry and Environment Guangdong Ocean University Zhanjiang524088 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

In contrast to previous lab-scale studies, full-scale studies show that low temperatures do not significantly hinder pharmaceutical and personal care product (PPCP) removal in tertiary treatment constructed wetland (CW) systems. This study investigated PPCP removal pathways (substrate adsorption, plant uptake, microbial degradation) in two full-scale CWs, highlighting the differences between full-scale and lab-scale study outcomes. Results demonstrated that low temperatures did not adversely affect PPCP removal in full-scale CWs. Substrate adsorption was minimally impacted at a relevant concentration of 100 ng/L, unlike lab-scale studies with typically higher concentrations (1 mg/L). Plant uptake was not affected, as mature plants in CWs exhibited a lower PPCP uptake capacity compared to seedlings in lab-scale studies. Furthermore, low temperatures did not reduce microbial biodegradation performance. However, low temperatures increased dissolved oxygen concentrations in the influent, supporting aerobic microbial activity. These findings emphasize the value of full-scale CWs for stable PPCP removal under low-temperature conditions. © 2025

关键词： Inclusions

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Plasticity Response Of Desert Shrubs To Extreme Drought Events At Different Phenophases Under the Context of Climate Change

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SSRN 2024年

作者： Wang, Chunyuan Yu, Minghan Ding, Guodong Quan, Zhanjun State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences Beijing100012 China State Key Laboratory of Environmental Protection for Regional Eco-Process and Function Assessment Chinese Research Academy of Environmental Sciences Beijing100012 China Institute of Ecology Chinese Research Academy of Environmental Sciences Beijing100012 China Yanchi Research Station School of Soil and Water Conservation Beijing Forestry University Beijing100083 China Key Laboratory of State Forestry Administration on Soil and Water Conservation Beijing Forestry University Beijing100083 China

Desert ecosystems are expected to suffer from extreme drought events with unprecedented frequency and magnitude amidst the current situation of severe droughts and erratic seasonal rainfall induced by global climate change. Against this background, it is essential to elucidate the differences in the plasticity response of typical desert vegetation to extreme drought events at different phenophases for predicting the response of desert ecosystems to climate change. Taking the typical subshrub Artemisia ordosica community in the Mu Us Desert as the research object, this study simulated the extreme drought events via controlling rainfall at the sample plot scale, setting up three extreme drought treatment gradients in phenophases. This paper aimed to investigate the differences in the impacts of extreme drought events at different phenophases on the phenotypic characteristics and functional traits of A. ordosica, as well as the trade-off response mechanism of its twig number and length, and nutrient reproduction allocation to extreme drought events. Results showed that (1) Phenotypic characteristics of A. ordosica decreased significantly under extreme drought events at each phenophase, while the number and length of twigs declined, thereby lowering the accumulation of ANPP;the impacts of the extreme drought events on ANPP accumulation of A. ordosica at each phenophase were as follows: flowering and fruiting stage > sprouting stage > vegetative growth stage. (2) The number and length of twigs of the current year showed a significant positive correlation under extreme drought conditions. (3) A. ordosica would adapt to extreme drought via increasing the proportion of reproductive growth and decreasing the proportion of vegetative growth during both sprouting and vegetative growth stages. This study has demonstrated the varying impacts on phenotypic characteristics and functional traits of A. ordosica by extreme drought at each phenophase, and A. ordosica possesses a plast

关键词： Drought

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Enhanced Nutrient Cycling in Solar Park Induced by Soil Indicator Taxa, Microbial Biomass and Metabolic Efficiency Improve the Ecosystem Multifunctionality in Arid Region

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SSRN 2023年

作者： Liu, Yu Ding, Chengxiang Wang, Tiemei Su, Derong Li, Zhuoqing Feng, Chaoyang Quan, Zhanjun Institute of Ecology Chinese Research Academy of Environmental Sciences Beijing100012 China State Environmental Protection Key Laboratory of Regional Eco-process and Function Assessment Beijing100012 China State Key Laboratory of Environmental Criteria and Risk Assessment Beijing100012 China School of Grassland Beijing Forestry University Beijing100083 China Academy of Animal Science and Veterinary Medicine Qinghai University Xining810016 China

The drive towards clean energy sources has prompted the worldwide construction of emerging photovoltaic solar parks. The intense Despite the advantages of lower pollutant and greenhouse gas emissions, the construction of solar parks (SP) is not without environmental and ecological consequences due to changes in land use and impacts on regional climate. Previous studies have reported that SP construction impacts microclimate, plant biomass, biodiversity, soil physicochemical properties, and soil microbial community structure. However, our understanding of how SP influences a wide range of ecosystem functions simultaneously remains incomplete. To address this gap, we assessed the changes in ecosystem multifunctionality (EMF) in SP habitats in arid ecosystem, by measuring twenty-three indicators related to ecosystem functions comprising primary production, soil nutrient pool, carbon cycling, nitrogen cycling, phosphorus cycling and oxidation-reduction. Furthermore, we identified the primary driving factors and regulatory mechanism of EMF in different periods since SP installation. The results showed that SP had positive effects on EMF indices, the positive effect size was higher in initial installation period (5.4%-149.0%) than in constant running period (0.4%-15.3%). The enhancement in EMF were mainly due to the enhanced nutrient cycling induced by increased abundance of fungal indicator taxa (Indicator) as well as microbial biomass and metabolic efficiency (MBM) according to the results of variance decomposition analysis and multiple linear regression. Moreover, the structural equation model revealed distinct regulatory mechanism between the two period, and a transition in the primary driving factors of EMF from Indicator to MBM. Together, our study reveals the different effect size of SP on EMF and changes in driving factor and regulatory mechanism of EMF during the different periods following SP installation. These findings complement the environmental impact analy

关键词： Ecosystems

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Waterbird Diversity and Influencing Factors in Various Types of Coastal Wetlands Around the Bohai Sea

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SSRN 2024年

作者： Mengdi, Fu Chunfei, Hou Jun, Wang Yuanyuan, Zhang Jiade, Bai Key Laboratory of Regional Eco-Process and Function Assessment and State Environment Protection Chinese Research Academy of Environmental Sciences 8 Anwai Dayangfang Chaoyang District Beijing100012 China Center for Biodiversity and Nature Reserve Chinese Academy of Environmental Planning Beijing100041 China Beijing Biodiversity Conservation Research Center Beijing100076 China Beijing Milu Ecological Research Center Beijing100076 China

China's coastal wetlands provide important breeding, migratory stopover and wintering areas for birds in the East Asian-Australasian flyway, and the Bohai Rim wetlands are one of the most important distribution areas for waterbirds. Seventeen coastal wetlands around the Bohai Sea were selected to investigate the diversity of waterbirds, clarify the community composition and its temporal and spatial changes, and analyze the main factors influencing waterbird diversity in different types of coastal wetlands. The results showed that 133 species of waterbirds, representing 18 families from 8 orders, were observed, mainly in the families Scolopacidae, Charadriidae and Laridae. From 2018 to 2023, the species, abundance and diversity of waterbirds fluctuated and increased, while the evenness showed a fluctuating and decreasing trend. PM2.5 and the construction of protected areas were the key factors influencing waterbird diversity, and vegetation cover, macroinvertebrates biodiversity index, population density and temperature were the main factors influencing waterbird diversity. PM2.5 was the most important factor influencing waterbird diversity in estuarine wetlands, followed by population density. Population density and vegetation cover were the most important factors influencing waterbird diversity in island wetlands, followed by the establishment of nature reserves. Population density was the most important factor influencing waterbird diversity in tidal wetlands, followed by the establishment of nature reserves. PM2.5 was the most important factor influencing waterbird diversity in shallow sea wetlands, followed by eutrophication. The results of this study are intended to provide a basis for scientific decision-making and precise policy implementation for the conservation of wetland bird diversity. © 2024, The Authors. All rights reserved.

关键词： Wetlands

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