检索结果-内蒙古大学图书馆

Catalytic Removal of Emerging Contaminants and Phenolic Compounds by Laccase: Transformation Mechanisms in Aquatic Environments—Polymerization or Degradation?

SSRN

引用

SSRN 2024年

作者： Zhang, Pan Xu, Jiahui Zhang, Xiaomeng Hou, Chengsi Wu, Deli State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science & Engineering Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

Employing laccase catalysis offers a green and efficient detoxification process for emerging contaminants. In previous reports, laccases can catalyze oxidative degradation alone or polymerization degradation with phenolic compounds. However, the interactions among emerging contaminants, phenolic compounds, and laccases in aquatic systems are often overlooked. In this study, phenolic compounds were introduced to enhance the polymerization reaction and promote the removal of emerging contaminants. Firstly, the optimal reaction conditions for the laccase-catalyzed SMX+GUA system were explored: at pH 6, with initial concentrations of SMX and GUA at 10 μM and 20 μM, and the addition of 0.05g laccase. Then, different contaminants were contrasted to clarify the regular reaction. In laccase-catalyzed reactions, emerging contaminants with phenolic hydroxyl groups tended to be directly enzymatically degraded, and those with (sub) amino groups tended to undergo polymerization reactions with enzymatic intermediate. Afterward, the possible reaction pathways and products were explored. Polymerization degradation was more prevalent in all systems. The active intermediates of polyphenols are formed to promote the formation of polymerization products through nucleophilic addition and free radical polymerization. Finally, the acute toxicity test of the solutions before and after the reaction indicated that a decrease in substrate concentration does not imply a reduction of toxicity. Therefore, the toxicity should be given more attention after treatment to prevent secondary environmental harm upon discharge. This study is expected to provide a valuable guideline for enzymatic water puriﬁcation. © 2024, The Authors. All rights reserved.

关键词： Free radicals

来源：评论

学校读者我要写书评

暂无评论

Molecular Oxygen-Assisted in Defect-Rich ZnO for Catalytic Depolymerization of Polyethylene Terephthalate

SSRN

引用

SSRN 2023年

作者： Cao, Jingjing Lin, Yuheng Zhou, Tianpeng Wang, Wei Zhang, Quanxing Pan, Bingcai Jiang, Wei State Key Laboratory of Pollution Control and Resources Reuse National Engineering Research Center for Organic Pollution Control and Resource Reuse School of the Environment Nanjing University Nanjing210023 China Department of Chemistry Centre for Pharmacy University of Bergen Bergen5007 Norway

Polyethylene terephthalate (PET) as the most production polyester plastics, its waste has a disruptive impact on the environment and ecosystem. Here, we report a catalytic depolymerization of PET into bis(2-hydroxyethyl) terephthalate (BHET) using molecule oxygen (O2)-assisted in defect-rich ZnO. At air, the PET conversion rate, the BHET yield, and the space-time yield are 3.5, 10.6 and 10.6 times higher than those in nitrogen, respectively. Combining structural characterization with the results of DFT calculations, we conclude that the (100) facet of defect-rich ZnO nanosheets conducive to formation of reactive oxygen species (*O2-) and Zn defect, promotes the PET breakage of the ester bond and thus complete the depolymerization processed. This approach demonstrates a sustainable route for PET depolymerization by molecule-assisted defect engineering. © 2023, The Authors. All rights reserved.

关键词： Catalysis

来源：评论

学校读者我要写书评

暂无评论

Oligomers from the Synthetic Polymers:Another Potential Iceberg of New Pollutants

引用

Environment & Health 2023年第4期1卷 228-235页

作者： Changzhi Shi Mengjing Wang Zimeng Wang Guangbo Qu Wei Jiang Xiangcheng Pan Mingliang Fang Department of Environmental Science and Engineering Fudan UniversityShanghai 200433China School of Energy and Environment and State Key Laboratory of Marine Pollution City University of Hong KongHong Kong 999077China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China State Key Laboratory of Pollution Control and Resources Reuse School of the EnvironmentNanjing UniversityNanjing 210023China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200438China Institute of Eco-Chongming Shanghai 202162China

pollution generated by synthetic polymers,particularly plastics,has become a significant global environmental ***,when compared to polymer-derived products like microplastics,oligomers have not received the attention they *** are by-products of polymer production and intermediates of *** the industrial advancements leading to an exponential increase in the production of new polymers,a majority of oligomers have remained inadequately *** the exposure and toxic effects of polylactic acid oligomers have been documented,the structures and fundamental properties of oligomers derived from most polymers are still poorly *** knowledge gap presents challenges in establishing effective analytical *** the potential of oligomers to act as new pollutants,it is imperative to investigate their environmental behavior,as well as their absorption,distribution,metabolism,excretion,and toxicity(ADMET)*** perspective highlights the research gap concerning oligomers.

关键词： oligomers polymers microplastic new pollutants ADMET

来源：评论

学校读者我要写书评

暂无评论

Combined Application of Alkaline Materials and Organic Fertilizer Accelerates Nitrification Process of Rare Earth Mining Soil

SSRN

引用

SSRN 2023年

作者： Wang, Min Wu, Song Lu, Yilin Wu, Haotian Si, Dunfeng Zhou, Dongmei State Key Laboratory of Pollution Control & Resources Reuse School of the Environment Nanjing University Nanjing210023 China

The extensive usage of ammonium sulfate as the leaching agent to extract rare earth elements led to widespread ammonia nitrogen (NH4+-N) pollution in the tailing soils of ion-adsorbed rare earth deposits in southern China. However, the cost-effective technologies to tackle with the long-term retention of NH4+-N in the rare earth mining soil have been largely unresolved. In this study, we developed a cost-effective approach to activate soil nitrification by the co-application of alkaline materials and organic fertilizer. The co-application of 0.3% of organic fertilizer and 0.1%~0.2% of CaO or MgO or Mg(OH)2 stimulated a soil NH4+-N removal rate of 2.01~7.58 mg kg-1 d-1 and a soil NO3-N accumulation rate of 1.56~7.09 mg kg-1 d-1. Noting that only if the soil pH was elevated to 8.00~9.00, the NH4+-N removal rate and NO3-N accumulation rate were dependent on the acid neutralization capacity of the alkaline materials. The application of CaCO3 could not stimulate soil nitrification due to the soil pH was uncapable to be elevated to above 7.5. The qPCR, amplicon sequencing, and nitrification inhibitor batch incubation results demonstrated that organic fertilizer supplied active ammonia-oxidizing bacteria Nitrosomonas europaea. The proliferation of Nitrosomonas europaea in the alkaline materials and organic fertilizer co-applied soil was responsible for the soil nitrification. Furthermore, the application of commercial denitrifying bacteria inoculum promoted the removal of accumulated NO3-N. The findings of this study provide a lost-cost technology to remove NH4+-N from the rare earth mining soil. (Image Presented) © 2023, The Authors. All rights reserved.

关键词： Rare earths

来源：评论

学校读者我要写书评

暂无评论

Trade-Off between Sulfidated Zero-Valent Iron Activity and Stability: Regulation of Iron Sulfides by Ammonium Dihydrogen Phosphate

SSRN

引用

SSRN 2024年

作者： Zhang, Yanshi Li, Fengmin Wang, Xiao Zhao, Chengxuan Zhang, Yiqiao Wang, Chunguang Li, Yanlu Xu, Chunhua Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University Qingdao266237 China State Key Lab of Crystal Materials Shandong University Jinan250100 China

The reactivity and stability of zero-valent iron (ZVI) and sulfidated zero-valent iron (S-ZVI) are inherently contradictory. Iron sulfides (FeSX) on the S-ZVI surface play multiple roles including electrostatic adsorption, catalyzing reduction, and acted as protective layer and reaction platform. We proposed to balance the reactivity and stability of S-ZVI by modulating iron sulfides. Benefiting from the superior coordination and accelerate electron transport capabilities of phosphate, environmentally friendly ammonium dihydrogen phosphate (ADP) was employed to regulate the FeSX in this study. Therefore, the N, P, and S-incorporated ZVI (NPS-ZVI) was prepared by liquid-phase precipitation using ADP as the nitrogen and phosphorus source. Raman spectra, FTIR, XPS, and density functional theory (DFT) calculations were combined to reveal that NH3 and HPO42- act as the main N and P species on the Fe surface, respectively. The superior reactivity of NPS-ZVI was quantified by different parameters (kobs, kSA, kM), which were 210.77, 27.44, and 211.17-fold than ZVI, respectively. Compared to S-ZVI, NPS-ZVI demonstrated excellent pH tolerance and reusability, and there was no risk of secondary pollution. Critically, NPS-ZVI could effectively maintain FeSX stability under the combination of diffusion limitation and surface protection mechanisms of ADP which demonstrated excellent long-term stability. The superior reactivity of NPS-ZVI was attributed to that ADP maintains FeSX stability and accelerates electron *** study provides a novel strategy in balancing the reactivity and stability of S-ZVI and offers theoretical support for material modification. © 2024, The Authors. All rights reserved.

关键词： Sulfur compounds

来源：评论

学校读者我要写书评

暂无评论

A nanoscale observation to explain the discrepancy of electron exchange capacities between biochar containing comparable surface redox-active moieties

引用

Biochar 2022年第1期4卷 503-517页

作者： Shasha Li Liming Shao Hua Zhang Xuemin Lu Fan Lü Pinjing He State Key Laboratory of Pollution Control and Resource Reuse Tongji UniversityShanghai 200092People’s Republic of China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092People’s Republic of China Institute of Waste Treatment and Reclamation Tongji UniversityShanghai 200092People’s Republic of China Shanghai Multi-Source Solid Waste Collaborative Treatment and Energy Engineering Technology Research Center ShanghaiPeople’s Republic of China

Biochar,possessing electron exchange capacities(EEC),is generally involved in environmental redox reactions due to the presence of redox-active moieties(RAMs).The phenomenon that chars containing comparable RAMs possess differential EEC revealed that the accessibility of RAMs is important to the redox ***,many studies have focused on the type of RAMs,whereas the distribution has been insufficiently ***,we achieved nanoscale observation of electroactive moieties on the surface of six chars using a conductive atomic force *** the two specific kinds of chars with submicron particles and opposite current distributions,the submicron particles took up only 1-4‰wt of biochar accounting for approximately 30-50%of electron-donating capacity(EDC),and electron-accepting capacity(EAC)became 87%and 1.40 times as before after removing submicron particles,***,the combined impact of RAMs and surface topography(that uneven distribution of RAMs resulted in outstanding EEC by enhancing accessibility)was ***,direct evidence of the link between char structure and EEC(that condensed aromatic structures were indispensable to EAC while both heteroatoms and amorphous aromatics contributed to EDC)was *** findings can aid in understanding the functions of biochar in biotic and abiotic redox processes.

关键词： Biochar Pyrogenic chars Redox property Electron exchange capacity C-AFM

来源：评论

学校读者我要写书评

暂无评论

The occurrence characteristics, removal efficiency, and risk assessment of polycyclic aromatic hydrocarbons in sewage sludges from across China

引用

Chemosphere 2024年 351卷 141033页

作者： Lv, Nan Wang, Bingqing Wang, Hui Xiao, Tingting Dong, Bin Xu, Zuxin State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China YANGTZE Eco-Environment Engineering Research Center China Three Gorges Corporation Beijing100038 China

Sewage sludge is considered to be an important sink for polycyclic aromatic hydrocarbons (PAHs) in wastewater treatment plants and the potential risks from sludge contaminated with PAHs during land application has attracted attention. To identify the priority PAHs for control and enhance their removal from sludge, the occurrence characteristics, removal efficiency, and risk assessment of PAHs in sewage sludges from across China were analyzed. Data collection was from 2001 to 2023. Results showed that 16 PAHs were widely detected in Chinese sewage sludge with total amounts (∑16PAHs) between 0.06 and 34.93 mg kg dw−1. Fossil fuel, coal, and biomass combustion are main anthropogenic sources of PAHs in China. In general, phenanthrene (PHE), anthracene (ANT), fluorescein (FL), chrysene (CHR), pyrene (PYR), and benzo[b]fluoranthene (BbF) are regarded as the main components and PAHs with 3–5 rings dominate (84.01%–91.53%) sewage sludge in China. Although aerobic composting and anaerobic treatment significantly improve ∑16PAHs removal, sludge stabilization treatment only reduced the risk by a small amount, especially for high-molecular-weight (HMW) PAHs. The benzo[a]anthracene (BaA), benzo[a]pyrene (BaP), and dibenzo[a,h]anthracene (DahA) are proposed as the priority control contaminants for sewage sludge in China because they have consistently high-risk quotient (RQ) values of 2.42–7.47, 1.28–3.16, 1.06–1.83 before and after sludge stabilization, respectively. More attention should be paid to BaA, BbF, benzo[k]fluoranthene (BkF), BaP, DahA, and indeno[1,2,3-cd]pyrene (IcdP) in Beijing;ANT, BaA, and BaP in Shanghai;and BaA and BaP in Guanghzou. Although the toxic equivalent quotient (TEQ) for PAHs met the limit concentration requirements of the national standard, the potential health risks due to long-term exposure to HMW PAHs cannot be ignored because the incremental lifetime cancer risk (ILCR) was consistently in the risk threshold range (>1 × 10−6). Some suggestions on e

关键词： Risk assessment

来源：评论

学校读者我要写书评

暂无评论

Morphology controlled Supramolecular Self-Assembly Porous Carbon Nitride Nanotube Via C6N6 Ring for Boosting Photocatalytic H2O2 Production

SSRN

引用

SSRN 2023年

作者： Wang, Jie Liu, Haibao Gao, Yue Liu, Bo Yue, Qinyan Xu, Xing Gao, Baoyu Pang, Lijing Guo, Kangying Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University Qingdao266237 China

The solar-driven photocatalytic H2O2 generation is an eco-friendly, energy-saving, and promising technology. Herein, porous g-C3N4 nanotube (TCN) with controllable morphology was successfully synthesized, and it was first reported that the formation of C6N6 ring promoted supramolecular self-assembly. The H2O2 yield of TCN corresponded well (R2=0.978) with the contents of C6N6 ring in TCN, which could be well modulated by the ratio of urea and melamine, and optimal performance was achieved at a ratio of 10:1 (TCN10). The H2O2 was generated on the surface of TCN10 through continuous two-step single-electron oxygen reduction reaction, with its formation kinetic constant and yield 8.29 and 7.25 times higher than those of pristine g-C3N4. The C6N6 ring enriched e- in O2 adsorption area, promoting the transfer of e- from TCN10 to O2, thereby reducing the energy barrier for generating H2O2. This study provided a promising strategy for H2O2 generation with controllable morphology and C6N6 ring. © 2023, The Authors. All rights reserved.

关键词： Nanotubes

来源：评论

学校读者我要写书评

暂无评论

Variation characteristics of fine particulate matter and its components in diesel vehicle emission plumes

引用

Journal of Environmental Sciences 2021年第9期33卷 138-149页

作者： Xianbao Shen Jiateng Hao Lei Kong Yue Shi Xinyue Cao Jiacheng Shi Zhiliang Yao Xin Li Bobo Wu Yiming Xu Kebin He State Environmental Protection Key Laboratory of Food Chain Pollution Control Beijing Technology and Business UniversityBeijing 100048China Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry Beijing Technology and Business UniversityBeijing 100048China School of Ecology and Environment Beijing Technology and Business UniversityBeijing 100048China State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex Beijing 100084China

A rapid reaction occurs near the exhaust nozzle when vehicle emissions contact the *** diesel vehicles were studied using a new multipoint sampling system that is suitable for studying the exhaust plume near the exhaust *** variation characteristics of fine particle matter(PM_(2.5)) and its components in diesel vehicle exhaust plumes were *** PM_(2.5) emissions gradually increased with increasing distance from the nozzle in the *** carbon emissions remained basically unchanged, organic carbon and total carbon(TC) increased with increasing *** concentrations of SO_(4)^(2-),NO_(3)^(-) and NH_(4)^(+) (SNA) directly emitted by the vehicles were very low but increased rapidly in the exhaust *** selective catalytic reduction(SCR) reduced 42.7% TC, 40% NO_(3)^(-) emissions, but increased 104% SO_(4)^(2-) and 36% NH_(4)^(+) emissions, *** summary,the SCR reduced 29% primary PM_(2.5) emissions for the tested diesel *** NH_(4)NO_(3) particle formation maybe more important in the plume, and there maybe other forms of formation of NH_(4)^(+) (***4Cl).The generation of secondary organic carbon(SOC) plays a leading role in the generation of secondary PM_(2.5).The SCR enhanced the formation of SOC and SNA in the plume, but comprehensive analysis shows that the SCR more enhanced the SNA formation in the plume, which is mainly new particles formation *** inconsistency between secondary organic aerosol(SOA) and primary organic aerosol definitions is one of the important reasons for the difference between SOA simulation and observation.

关键词： Variation characteristics Diesel vehicle Emission plume PM2.5 Components

来源：评论

学校读者我要写书评

暂无评论

Insight into the control Mechanism of Polymeric Ferric Titanium Composite Coagulant on Membrane Fouling: Role of Nom

SSRN

引用

SSRN 2023年

作者： Liu, Haigang Liu, Beibei Gao, Yue Wang, Yan Yue, Qinyan Guo, Kangying Gao, Baoyu Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University Shandong Qingdao266000 China

To make up for the defects of traditional coagulants, a series of polymerized ferric titanium coagulants (PFTC) with different Ti/Fe molar ratio and basicity were prepared and used to remove different natural organic matters (NOM). The effects of the basicity and Ti/Fe molar ratio on the structure of PFTC hydrolysates was preliminarily explored through the changes in the peak intensity of OH- and adsorbed water in Fourier transform infrared (FTIR) spectra, as well as the peak displacement of the lattice oxygen and hydroxyl oxygen in X-ray photoelectron spectroscopy (XPS) spectra. According to the results of the hydrolysis polymerization curve and chemical species distribution of PFTC, the hydrolysis processes of Fe(III) and Ti(IV) were proposed. The results of coagulation experiment indicated that PFTC with low basicity and moderate Ti/Fe molar ratio could efficiently remove UV254, DOC and turbidity. When the amount of OH- or Ti(IV) was excessively high, the hydrolysates of PFTC transferred from the oligomers to the medium polymerized or colloidal species. Therefore, although PFTC with high B value exhibited relatively low removal efficiency for UV254 and DOC, they could efficiently remove the hydrophilic small molecule substances through the hydrogen bonding or sweeping effects of the amorphous hydroxyl complexes. Finally, it was found that the control performance of PFTC on membrane fouling mainly depended on its efficiency in removing NOM. This study will provide new ideas for the development of composite coagulant and the precise control of membrane fouling. © 2023, The Authors. All rights reserved.

关键词： Molar ratio

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：