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SSRN 2023年

作者： Liu, Xinning Qi, Xiang Gu, Yuyi Huang, Xia Liang, Peng State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

As serious water ecological pollution caused by toxicant leakage occurs frequently, early-warning for toxicity presented in water environment attracts increasing attentions as it saves time to retain water safety and human health. Electrochemically active biofilm (EAB) sensor is a promising device for in situ real-time water toxicity early-warning. To improve the sensitivity of EAB sensor particularly for low-concentration toxicity warning, this study employed titanium mesh (TiM) as the anode to construct an EAB sensor. Compared to traditional EAB sensor with carbon felt (CF) anode, the sensitivity of the TiM sensor was increased upto 37.4 times. The effects of mesh size (TiM50, TiM100, TiM150) and operation mode (flow-by and flow-through) on the sensitivity of TiM sensors were further investigated. Results showed the sensor with TiM100 anode had the highest inhibition rate (IR) in flow-by mode, attributed to low charge transfer resistance (Rct) and fast mass transfer. Flow-through operation could further enhance TiM100 sensor’s sensitivity from flow-by operation and succeeded to signal as low as 0.0025% formaldehyde, the lowest so far tested in EAB sensor with sensing anode. Multiple toxicity shocks on flow-through TiM100 sensor revealed its good recoverability towards all tested formaldehyde concentration from 0.01% to 0.0025%, during which electrochemical activity degradation and biomass accumulation partially impaired the repeatability. This work highlights the great improvement of EAB sensors by utilizing titanium mesh as EAB carrier and provides a reference for the practical application of metallic materials for EAB sensors. © 2023, The Authors. All rights reserved.

关键词： Anodes

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Interface-induced charge transfer pathway switching of a Cu_(2)O-TiO_(2)photocatalyst from p-n to S-scheme heterojunction for effective photocatalytic H_(2)evolution

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Journal of Materials Science & Technology 2024年第26期193卷 98-106页

作者： Kaihui Huang Guijie Liang Shaolong Sun Haobin Hu Xiaoming Peng Rongchen Shen Xin Li Institute of Biomass Engineering Key Laboratory of Energy Plants Resource and UtilizationMinistry of Agriculture and Rural AffairsSouth China Agricultural UniversityGuangzhou 510642China Hubei Key Lab Low Dimens Optoelect Mat&Devices Hubei University of Arts and ScienceXiangyang 441053China College of Natural Resources and Environment South China Agricultural UniversityGuangzhou 510642China Key Laboratory of Efficient Utilization of Oil and Gas Resources in Longdong College of Petroleum and Chemical EngineeringLongdong UniversityQingyang 745000China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China

Photocatalytic hydrogen evolution from water splitting is an appealing method for producing clean chemical ***_(2)O,with a suitable bandgap,holds promise as a semiconductor for this ***,the strong photo-corrosion and rapid charge recombination of Cu_(2)O strongly limit its application in the photocatalytic ***,an S-scheme heterojunction photocatalyst composed of TiO_(2)and Cu_(2)O was rationally designed to effectively avoid the photo-corrosion of Cu_(2)*** introduction of an interfacial nitrogen-doped carbon(NC)layer switches the heterojunction interfacial charge transfer pathway from the p-n to S-scheme heterojunction,which avoids excessive accumulation of photogenerated holes on the surface of Cu_(2)***,the hybrid structure shows a broad spectral response(300-800 nm)and efficient charge separation and transfer ***,the highest photocatalytic hydrogen evolution rate of TiO_(2)-NC-3%Cu_(2)O-3%Ni is 13521.9μmol g^(-1)h^(-1),which is approximately 664.1 times higher than that of pure Cu_(2)***-situ X-ray photoelectron spectroscopy and Kelvin probe confirm the charge transfer mechanism of S-scheme *** formation of S-scheme heterojunctions effectively accelerates the separation of photogenerated electron-hole pairs and enhances redox capacity,thereby improving the photocatalytic performance and stability of Cu_(2)*** study provides valuable insights into the rational design of highly efficient Cu_(2)O-based heterojunction photocatalysts for hydrogen production.

关键词： Photocatalytic hydrogen evolution Cu_(2)O S-scheme heterojunction Charge separation mechanism Nitrogen doped carbon

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Resource utilization of typical biomass wastes as biochars in removing plasticizer diethyl phthalate from water: characterization and adsorption mechanisms

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Frontiers of environmental Science & Engineering 2023年第1期17卷 49-61页

作者： Mei Shi Xiao Wang Mengying Shao Lun Lu Habib Ullah Hao Zheng Fengmin Li Institute of Coastal Environmental Pollution Control College of Environmental Science and EngineeringKey Laboratory of Marine Environment and Ecology(Ministry of Education)Ocean University of ChinaQingdao 266100China State Environmental Protection Key Laboratory of Environmental Pollution Health Risk Assessment South China Institute of Environmental SciencesMinistry of Ecology and EnvironmentGuangzhou 510655China Department of Environmental Science Zhejiang UniversityHangzhou 310058China Marine Ecology and Environmental Science Laboratory Pilot National Laboratory for Marine Science and TechnologyQingdao 266071China Sanya Oceanographic Institution Ocean University of ChinaSanya 572000China

Plastic pollution as a global environmental issue has become a research hotspot,among which the removal of inherent plasticizer(e.g.,phthalic acid esters,PAEs)received increasing ***,the effects of biochars derived from different feedstocks on the adsorption of PAEs are poorly ***,the characteristics of biochars derived from six largely produced biomass wastes in China at 400°C,as well as their performance in adsorption of diethyl phthalate(DEP),one of frequently detected PAEs in aqueous environment,were *** results indicated that the variation in feedstock type showed significant changes in the properties(e.g.,porosity,specific surface area,surface functional groups)of biochars,which affected DEP adsorption and *** order and Freundlich models fitted the adsorption data well,and adsorption mechanisms mainly included hydrophobic effect,followed by micropore filling,hydrogen bonding,andπ-πEDA *** thermodynamics revealed that the adsorption was a spontaneous and exothermic the adsorption capacities of DEP on these biochars slightly decreased with the increasing pH but increased with the increasing ionic *** these biochars,the giant reed biochar with relatively higher DEP adsorption and low desorption exhibited the great efficiency for DEP removal as an environment-friendly *** results highlighted the significant roles of micropore filling and hydrogen bond in determining adsorption capacity of designed biochars prepared from selecting suitable agricultural straws and wetland plant waste to typical *** findings are useful for producing designed biochars from different biomass wastes for plasticizer pollution control.

关键词： Plastic pollution Phthalic acid esters Designed biochar Wetland plant Adsorption

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Surface Uptake of Exogenous Volatile Organic Compounds Enhances the NO2-to-HONO Conversion on Soot

ACS ES&T Air

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ACS ES&T Air 2025年第6期2卷 1107-1114页

作者： Xinyuan Zhao Qiang Wang Peng Zhang Yonghong Wang Shuying Li Zhanyu Su Jun Liu Biwu Chu Qingxin Ma Yujing Mu Hong He College of Environmental Science and Engineering Beijing Forestry University Beijing 100083 China；State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China College of Environmental Science and Engineering Beijing Forestry University Beijing 100083 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China；Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China；State Key Laboratory of Advanced Environmental Technology Institute of Urban Environment Xiamen 361021 China

Heterogeneous reduction of nitrogen dioxides (NO2) on soot has been suggested to be a source of nitrous oxide (HONO) in the atmosphere. However, conventional wisdom says that the contribution of NO2reduction on soot to HONO formation is limited due to the rapid deactivation of surface reductive sites in the atmosphere. On the contrary, we show that adsorbed anthropogenic and biogenic volatile organic compounds (VOCs), collectively called exogenous VOCs (EVOCs), can persistently promote the heterogeneous conversion of NO2to HONO on soot. The surface uptake of NO2driven by H2O, coupled with the hydrogen reduction of NO2supported by EVOCs on elemental carbon (EC), is proposed to be the key pathway causing the persistent production of HONO. Furthermore, field observation conducted during biomass burning seasons in the North China Plain also showed that the presence of EVOCs promotes HONO production significantly. Our results imply that the continuous adsorption and conversion of EVOCs on soot surfaces may have a remarkable enhancing impact on the persistent conversion of NO2to HONO in the atmosphere.

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Mnnx-Carbon-Silica-Framework for Highly Efficient Heterogeneous Catalytic Ozonation of Electron-Rich Organics Through Nonradical Pathway

SSRN

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SSRN 2023年

作者： Chen, Shuning Ren, Tengfei Lu, Kechao Ouyang, Changpei Huang, Xia Zhang, Xiaoyuan State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

Heterogeneous catalytic ozonation (HCO) is considered as a powerful technique for wastewater treatment and tuning the active sites of catalysts can adjust the HCO pathway of removing organics. The traditional hydroxyl radical pathway may be affected by wastewater matrix. In comparison, nonradical pathway such as 1O2 pathway and intra-electron transfer makes it a promising choice for electron-rich organics. In this study, we proposed MnNx loaded Carbon-Silica-Framework (MnNx-CSF) for selective removal for electron-rich organics and stable mechanical strength for catalytic ozonation. The results showed that the TOC removal for p-HBA was 81% in MnNx -CSF HCO within 30 min, while only 44% and 22% of TOC was removed after 30 min in the Mn-SiO2 HCO process and ozonation process. The N species were considered to be related to catalytic efficiency, and the graphitic N and pyridine N might be the relevant active N species in MnNx-CSF. Pyridine N could coordinate with Mn atoms, and the active site MnN4 showed a high tendency to adsorb O3 and decompose it into *Oads and 1O2. Graphitic N could also enhance the electron transfer pathway to degrade organics. Modulating N species and metal doping is considered to be a promising strategy to regulate the catalysts to achieve catalytic ozonation through a nonradical way. The results highlighted that experiments with theoretical calculations clearly showed that metal/N catalysts were effective for catalytic ozonation to degrade electron-rich organics. © 2023, The Authors. All rights reserved.

关键词： Silica

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Modelling the thresholds of nitrogen/phosphorus concentration and hydraulic retention time for bloom control in reclaimed water landscape

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Frontiers of environmental Science & Engineering 2022年第10期16卷 53-63页

作者： keying Song Shufeng Zhu Yun Lu Guohua Dao Yinhu Wu Zhuo Chen Shengnan Wang Junhan Liu Wenguang Zhou Hong-Ying Hu Environmental Simulation and Pollution Control State Key Joint Laboratory State Environmental Protection Key Laboratory of Microorganism Application and Risk Control(SMARC)School of EnvironmentTsinghua UniversityBeijing 100084China Beijing Laboratory for Environmental Frontier Technologies Beijing 100084China Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China Key Laboratory of Poyang Lake Environment and Resource Utilization Ministry of Educationand School of ResourcesEnvironmental&Chemical EngineeringNanchang UniversityNanchang 330031China Research Institute for Environmental Innovation(Suzhou)Tsinghua JiangsuSuzhou 215163China

The risks posed by algal blooms caused by nitrogen and phosphorus in reclaimed water used in urban water landscapes need to be carefully *** this study,the combined effects of the nitrogen and phosphorus concentrations and the light intensity and temperature on the specific growth rates of algae were determined using Monod,Steele,and Arrhenius models,then an integrated algal growth model was *** algae biomass,nitrogen concentration,and phosphorus concentration mass balance equations were used to establish a new control model describing the nitrogen and phosphorus concentration and hydraulic retention time thresholds for algal *** model parameters were determined by fitting the models to data acquired ***,the control model and numerical simulations for six typical algae and mixed algae under standard conditions were used to determine nitrogen/phosphorus concentration and hydraulic retention time thresholds for landscape water to which reclaimed water is supplied(i.e.,for a reclaimed water landscape).

关键词： Reclaimed water landscape Algal bloom Nitrogen and phosphorus Hydraulic retention time Threshold control model

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Review on heterogeneous oxidation and adsorption for arsenic removal from drinking water

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Journal of environmental Sciences 2021年第12期33卷 178-188页

作者： Ruiping Liu Jiuhui Qu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China

The long term exposure of arsenic via drinking water has resulted in wide occurrence of arsenisim globally, and the oxidation of the non-ionic arsenite(As(Ⅲ)) to negatively-charged arsenate(As(Ⅴ)) is of crucial importance for the promising removal of arsenic. The chemical oxidants of ozone, chlorine, chlorine dioxide, and potassium permanganate may achieve this goal;however, their application in developing countries is sometimes restricted by the complicate operation and high cost. This review paper focuses on the heterogeneous oxidation of As(Ⅲ) by solid oxidants such as manganese oxide, and the adsorption of As(Ⅴ)accordingly. Manganese oxide may be prepared by both chemical and biological methods to achieve good oxidation performance towards As(Ⅲ). Additionally, manganese oxide may be combined with other metal oxides, e.g., iron oxide, to improve the adsorption capability towards As(Ⅴ). Furthermore, manganese oxide may be coated onto porous materials of metal organic frameworks to develop novel adsorbents for arsenic removal. To achieve the application in engineering works, the adsorbents granulation may be achieved by drying and calcination, agglomeration, and the active components may also be in situ coated onto the porous materials to maintain the oxidation and adsorption activities as much as possible. The novel adsorbents with heterogeneous oxidation and adsorption capability may be carefully designed for the removal of arsenic in household purifiers, community-level decentralized small systems, and the large-scale drinking water treatment plants(DWTPs).This review provides insight into the fundamental studies on novel adsorbents, the development of innovative technologies, and the demonstration engineering works involved in the heterogeneous oxidation and adsorption, and may be practically valuable for the arsenic pollution control globally.

关键词： Arsenic Heterogeneous oxidation Adsorption Manganese oxide Drinking water

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Performance of a Mixed Inoculum of Sludge and Pit Mud for Short-And Medium-Chain Fatty Acids Production: Insight into key Microbiome and Functional Potential in Anaerobic Fermentation Inoculum

SSRN

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SSRN 2023年

作者： Yu, Peng Wu, Menghan Bao, Wanyiin Wang, Hui State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

In this study, medium-chain fatty acids (MCFA) production from food waste with ethanol as electron donor using three different inoculants (active sludge, pit mud and mixture of sludge and pit mud). The results show that the R3 (mixed inoculum of sludge and pit mud) produced 8539.1 mg COD/L of MCFA, which is significantly higher than that produced by R1 (active sludge, 2712.6 mg COD/L) and R2 (pit mud, 3585.9 mg COD/L). The major MCFAs were caproate and heptanoate, and the SCFA and MCFA selectivity reaches 59.2%. Microbial community analysis revealed that the relative abundance levels of Clostridium_sensu_stricto_1, Clostridium_sensu_stricto_12 and Oscibacter were positively correlated with MCFA production. Further analysis of the enzymes related genes involved in the MCFA biosynthesis indicates that they were mainly related to enzymes of Clostridium, Oscibacter and Ruminiclostridium. These were the key genera involved in the chain elongation process. Metagenomic analysis revealed that fatty acid biosynthesis (FAB) pathway was the main pathway of MCFA synthesis in all three fermentation reactors. The abundance levels of all FAB pathway related-genes and MCFA functional microorganism were higher in R3. Additionally, the enrichment of the main gene abundance of metabolic pathway revealing that the mixed inoculum of sludge and pit mud combined the ability of fatty acid biosynthesis and carbohydrate metabolism, with higher fermentation potential. Overall, this study provides new strategies and insights for MCFA production. © 2023, The Authors. All rights reserved.

关键词： Genes

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Enhancement of Medium-Chain Fatty Acids Production from Sludge Anaerobic Fermentation Liquid Under Moderate Sulfate Reduction

SSRN

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SSRN 2023年

作者： Gao, Shan Chen, Zhan Zhu, Shihui Yu, Jinlan Wen, Xianghua State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua University Beijing100084 China

In this study, batch tests for chain elongation (CE) process of sludge anaerobic fermentation liquid (SAFL) under different SCOD/SO42- ratios were performed. The effects of sulfate reduction on the performance of medium-chain fatty acids (MCFAs) production, fermentation liquid properties and microbial communities were systematically investigated. The moderate sulfate reduction under the optimum SCOD/SO42- of 20:1 enhanced the n-caproate production, giving the maximum n-caproate concentration, selectivity and production rate of 5.49 g COD/L, 21.4% and 4.87 g COD/L/d, respectively. The excessive sulfate reduction under SCOD/SO42- ≤ 5 completely inhibited the CE process, resulting in almost no n-caproate generation. The variations in n-caproate production under different conditions of SCOD/SO42- were all well fitted with the modified Gompertz kinetic model. Alcaligenes and Ruminococcaceae_UCG-014 were the dominant genus-level biomarkers under moderate sulfate reduction (SCOD/SO42- = 20), which enhanced the n-caproate production by increasing the generation of acetyl-CoA and the hydrolysis of difficult biodegradable substances in SAFL. The findings in this work provide a strategy and a theoretical basis for the further enhancement of MCFAs production from excess sludge. © 2023, The Authors. All rights reserved.

关键词： Sulfur compounds

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Coupling magnetic particles with flocculants to enhance demulsification and separation of waste cutting emulsion for engineering applications

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Journal of environmental Sciences 2021年第7期33卷 173-183页

作者： Yongjiao Xiong Baoqiang Wu Xiangfeng Huang Chenlu Li Bin Lu Jia Liu Lijun Lu Shiyang Li Kaiming Peng College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource ReuseMinistry of Education Key Laboratory of Yangtze River Water EnvironmentShanghai Institute of Pollution Control and Ecological SecurityTongji UniversityShanghai 200092China

Magnetic particles were coupled with a flocculant to enhance the demulsification and separation of waste cutting *** optimal magnetic particle size and critical magnetic field conditions were investigated to achieve large-scale engineering application of magnetic demulsification separation for waste cutting emulsion *** micro-scale magnetic particles were found to show comparable effects to nano-scale magnetic particles on enhancing the demulsification and separation of cutting emulsions,which are beneficial for broadening the selectivity of low-cost magnetic *** critical magnetic separation region was determined to be an area 40 mm from the magnetic field *** to the flocculant demulsification,the magnetic demulsification separation exhibited a significant advantage in accelerating flocs-water separation by decreasing the separation time of flocs from 180-240 min to less than 15 min,compressing the flocs by reducing the floc volume ratio from 60%-90%to lower than 20%,and showing excellent adaptability to the variable properties of waste cutting *** with the design of the magnetic disk separator,continuous demulsification separation of the waste cutting emulsion was achieved at 1.0 t/hr for at least 10 hr to obtain clear effluent with 81%chemical oxygen demand removal and 89%turbidity *** study demonstrates the feasibility of applying magnetic demulsification separation to large-scale continuous treatment of waste ***,it addresses the flocs-water separation problems that occur in practical flocculant demulsification engineering applications.

关键词： Waste cutting emulsion Magnetic particles Demulsification and separation Magnetic disk separator Large-scale treatment

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