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The Removal of Antibiotic Resistant Bacteria and Antibiotic Resistance Genes by Sulfidated Nanoscale Zero-Valent Iron Activating Periodate: Efficacy and Mechanism

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SSRN 2023年

作者： Liang, Li Zhang, Guosheng Dai, Xuening Li, Weiying State Key Laboratory of Pollution Control and Resource Reuse Tongji University Shanghai200092 China College of Environmental Science and Engineering Tongji University Shanghai200092 China Key Laboratory of Yangtze River Water Environment The Ministry of Education Tongji University Shanghai200092 China Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

Antibiotic resistant bacteria (ARB) and antibiotic resistance genes (ARGs) have drawn much more attention due to their high risk on human health and ecosystem. In this study, the performance of sulfidated nanoscale zero-valent iron (S-nZVI)/periodate (PI) system toward ARB inactivation and ARGs removal was systematically investigated. The S-nZVI/PI system could realize the complete inactivation of 1 × 108 CFU/mL kanamycin, ampicillin, and tetracycline-resistant E. coli HB101 within 40 min, meanwhile, possessed the ability to remove the intracellular ARGs (iARGs) (including aphA, tetA, and tnpA) carried by E. coli HB101. Specifically, the removal of aphA, tetA, and tnpA by S-nZVI/PI system after 40 min reaction was 0.31, 0.47, and 0.39 log, respectively. The reactive species attributed to the E. coli HB101 inactivation were HO• and O2•−, which could cause the destruction of E. coli HB101 morphology and enzyme system, the leakage of intracellular substances, and the damage of iARGs. Moreover, the influence of the dosage of PI and S-nZVI, the initial concentration of E. coli HB101, as well as the co-existing substance (such as HCO3–, NO3–, and humic acid (HA)) on the inactivation of E. coli HB101 and its corresponding iARGs removal was also conducted. It was found that the high dosage of PI and S-nZVI and the low concentration of E. coli HB101 could enhance the disinfection performance of S-nZVI/PI system. The presence of HCO3–, NO3–, and HA in S-nZVI/PI system showed inhibiting role on the inactivation of E. coli HB101 and its corresponding iARGs removal. Overall, this study demonstrates the superiority of S-nZVI/PI system toward ARB inactivation and ARGs removal. © 2023, The Authors. All rights reserved.

关键词： Escherichia coli

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Rapid oxidation of black phosphorus induced by copper ions via promoting oxygen bonding and phosphate desorption

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National Science Open 2024年第5期3卷 100-113页

作者： Zhiyu Zhu Sha Yang Kun Lu Shipeng Dong Xiaoyan Sun Jieyin Zheng Shixiang Gao Wei Liu Liang Mao State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentChemistry and Biomedicine Innovation CenterNanjing UniversityNanjing 210093China Nano Structural Materials Center School of Materials Science and EngineeringNanjing University of Science and TechnologyNanjing 210094China School of Environmental Science and Engineering Zhejiang Gongshang UniversityHangzhou 310018China Nanjing Qixia District Hospital Nanjing 210046China Cambridge A-Level Centre Nanjing Jinling High SchoolNanjing 210005China

Black phosphorus(BP)has garnered significant interest in the field of biomedicine because of its exceptional *** oxidation product of BP phosphate has been utilized in numerous studies for the purpose of repairing bone defects and inducing apoptosis and autophagy in cancer ***,this process has drawbacks in terms of low yield and a slow rate of phosphate *** this study,we found that the oxidation rate of BP was increased 120-fold and the yield proportion of phosphate BP product was increased from 30%to 85%with the presence of less than 0.1%copper ions(Cu^(2+))in the reaction *** enhancement was attributed to the fact that the presence of Cu^(2+)promoted the bonding of oxygen on the BP surface and then the desorption of phosphate molecules from the BP *** study offers a novel perspective on the process of BP oxidation and introduces innovative concepts for the development of biological drug delivery systems capable of rapid decomposition.

关键词： black phosphorus reaction pathway reaction efficiency copper ions reaction mechanism

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Synergistic Mechanism of Modified nZVI and Citrobacter Reshaping Sludge Microbiome Drives Co-Removal of HBCD and Nutrients in Municipal Wastewater

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SSRN 2025年

作者： Li, Tianyu He, Yuzhe Zhang, Weixian Peng, Xingxing School of Environmental Science and Engineering Sun Yat-sen University Guangdong Guangzhou510006 China Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology Guangzhou510275 China Tongji University College of Environmental Science & Engineering State Key Lab Pollut Control & Resource Reuse Shanghai Shanghai200092 China

Hexabromocyclododecane (HBCD), a persistent and toxic brominated flame retardant, poses severe ecological and health risks due to its bioaccumulation and endocrine-disrupting effects. Effective removal from wastewater is critical to mitigate risks. Coupling functional microbes with modified nanomaterials represents a robust approach for degrading such recalcitrant organohalides. Based on the research foundation of the functional bacterial strain Citrobacter sp. Y3 and a modified nano-zero-valent iron (nZVI) coupled system, we designed and constructed a novel anaerobic continuous stirred-tank reactor (CSTR) system for the treatment of municipal wastewater in this study. HBCD-contaminated wastewater and actual domestic sewage were fed into this CSTR system. During continuous monitoring of HBCD concentration changes over 360 h, we simultaneously tracked the removal efficiencies of nitrogen (N), phosphorus (P), and chemical oxygen demand (COD). The results demonstrated that the HBCD degradation rate reached 100% within 72 h, while the removal of other nutrients met regulatory discharge requirements. The CSTR system significantly enriched diverse functional bacterial taxa harboring multiple functional genes, including organohalide-respiring bacteria (OHRB) (rdhA/B, PecA/B), iron-reducing bacteria (IRB) (cymA, fur), and nitrogen/phosphorus-removing bacteria (hzoB, haoA, norB and pstA/B/C). Dynamic interactions (synergistic cooperation and competition) among microbial communities drove the decomposition and transformation of pollutants. To our knowledge, this study provides the first demonstration of coupling functional bacteria with modified nanomaterials in activated sludge systems. © 2025, The Authors. All rights reserved.

关键词： Health risks

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Fortifying casein phosphopeptides and Ca in wheat reduces the As, Cd, and Pb bioavailability based on a mouse model: Calcium and phosphate transporters and gut microbiota

Soil and Environmental Health

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Soil and Environmental Health 2024年第4期2卷

作者： Chen, Sheng-Zhi Lin, Xin-Ying Xue, Rong-Yue Duan, Xu Zhou, Dong-Mei Ma, Lena Q. Li, Hong-Bo State Key Laboratory of Pollution Control and Resource Reuse Jiangsu Key Laboratory of Vehicle Emissions Control School of Environment Nanjing University Nanjing 210023 China Institute of Soil and Water Resources and Environmental Science College of Environmental and Resource Sciences Zhejiang University Hangzhou 310058 China

Reducing the oral bioavailability of metal contaminants including As, Cd, and Pb in foods can protect human health. Studies showed reduced metal bioavailability with elevated Ca and Fe intake;however, the effectiveness of enhancing food Ca and Fe bioavailability remains unknown. Based on a mouse bioassay and using metal accumulation in mouse tissues (kidneys and liver) as the bioavailability endpoint, this study investigated the roles of casein phosphopeptides (CPP, food nutrition fortifier) in lowering the As, Cd, and Pb bioavailability from consuming a metal-contaminated wheat. The CPP amendment at 0.10–0.50% in wheat promoted its Ca bioavailability, causing 33–62% and 59–80% decreases in the gene expression encoding for duodenal Ca and phosphate transporters in mice. This limited transcellular transport of Cd²⁺ and inorganic arsenate via Ca and phosphate transporters respectively, thus leading to 27% and 34% decreases in Cd and As contents in mouse kidneys fed with wheat at 0.50% CPP amendment. In addition, CPP promoted the colonization of Feacalibaculum and Bifidobacterium in mouse gut, likely promoting As excretion in feces by 81–112%. In contrast to As, and Cd, CPP failed to reduce Pb contents in mouse tissue after consuming CPP-amended wheat, probably by elevating wheat-Pb solubility in the intestinal fluid by 48–136%. However, co-amendment of 0.30% CPP and 500 μg g⁻¹ Ca as Ca gluconate lowered the As, Cd, and Pb contents in mouse kidneys by 38–71%. The data indicate that fortifying Ca together with CPP in wheat can reduce human exposure to multi-metals via dietary intake. © 2024 The Author(s)

关键词： Arsenic excretion Arsenic speciation Bioavailability endpoint Dietary intake Gastrointestinal Gene expression Intestinal epithelial cells Kidneys and liver Metal solubility Oral bioavailability

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Sulfur cycle as an nitrate in a electron mediator between carbon and constructed wetland microcosm

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Frontiers of Environmental Science & Engineering 2020年第4期14卷 17-29页

作者： Wenrui Guo Yue Wen Yi Chen Qi Zhou State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China Key Laboratory of the Three Gorges Region's Eco-Environment Ministry of EducationCollege of Environment and EcologyChongqing UniversityChongqing 400044China

A constructed wetland microcosm was employed to investigate the sulfur cycle-mediated electron transfer between carbon and *** accepted electrons from organics at the average rate of 0.84 mol/(m3·d)through sulfate reduction,which accounted for 20.0%of the electron input *** remainder of the electrons derived from organics were accepted by dissolved oxygen(2.6%),nitrate(26.8%),and iron(III)(39.9%).The sulfide produced from sulfate reduction was transformed into acidvolatile sulfide,pyrite,and elemental sulfur,which were deposited in the substratum,storing electrons in the microcosm at the average rate of 0.52 mol/(m3·d).In the presence of nitrate,the acid-volatile and elemental sulfur were oxidized to sulfate,donating electrons at the average rate of 0.14 mol/(m3•d)and driving autotrophic denitrification at the average rate of 0.30 g N/(m3·d).The overall electron transfer efficiency of the sulfur cycle for autotrophic denitrification was 15.3%.A mass balance assessment indicated that approximately 50%of the input sulfur was discharged from the microcosm,and the remainder was removed through deposition(49%)and plant uptake(1%).Dominant sulfatereducing(i.e.,Desulfovirga,Desulforhopalus,Desulfatitalea,and Desulfatirhabdium)and sulfuroxidizing bacteria(i.e.,Thiohalobacter,Thiobacillus,Sulfuritalea,and Sulfurisoma),which jointly flilfilled a sustainable sulfur cycle,were *** results improved understanding of electron transfers among carbon,nitrogen,and sulfur cycles in constructed wetlands,and are of engineering significance.

关键词： Constructed wetland Sulfur cycle Electron transfer Denitrification

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Combined Toxicity of Microplastics with Different Sizes and Lead on Zebrafish Through Gut-Liver and Gut-Brain Axes

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SSRN 2023年

作者： Yu, Jing Chen, Ling Wu, Bing State Key Laboratory of Pollution Control and Resource Reuse School of Environment Nanjing University Nanjing210023 China School of Food Science and Pharmaceutical Engineering Nanjing Normal University Nanjing210023 China

Microplastics (MPs) can adsorb heavy metals, inducing combined toxicity to aquatic organisms. However, the combined effects of MPs and heavy metals on gut-liver and gut-brain axes are not fully understood. Thus, the combined effects of polystyrene microplastics (PS-MPs) with two concentrations (20 and 200 μg/L) and three sizes (0.1, 10, and 250 μm) and Pb (50 μg/L) on the gut-liver and gut-brain axes of zebrafish were investigated. Results demonstrated that combined exposures of 0.1 μm PS-MPs and Pb resulted in the most dramatic changes to gut microbial community diversity. The expression of zo-1 and occludin were significantly down-regulated in 0.1 μm and 250 μm PS-MPs combined exposures. The lipopolysaccharide content significantly increased in the liver of 0.1 μm and 250 μm PS-MP combined groups than PS-MPs or Pb alone exposures, indicating impaired gut barrier function. Subsequent studies revealed that 0.1 μm and 250 μm PS-MP combined groups induced liver inflammation through the TLR4/NF-κB pathway. Meanwhile, all exposure groups had an impact on the expression of genes related to bile acid metabolism (cyp7a1, fgf19, abcb11b, and slc10a2) and neurotransmitters (tph1a, tph2, pink, and trh). This study sheds new light on the understanding of the toxicity mechanism of MPs and metal. © 2023, The Authors. All rights reserved.

关键词： Microplastic

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Simultaneous and Long-Term Effective Immobilization of Lead, Cadmium and Arsenic in Multi-Contaminated Soil by Ferrihydrite-Supported Animal-Derived Biochar

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SSRN 2022年

作者： Hong, Chengyi Zhang, Jichen Liu, Tingran Teng, Wei Fu, Rongbing Qiu, Yuping Department of Environmental Science College of Environmental Science and Engineering Tongji University State Key Laboratory of Pollution Control and Resources Reuse Shanghai Institute of Pollution Control and Ecological Security Shanghai200092 China

The multi-contaminants of cationic Pb/Cd and anionic As in soils is difficult to simultaneously immobilize by common chemical amendments. Here, a novel ferrihydrite-supported animal-derived biochar (FAB) was prepared and added to pristine Pb/Cd/As-contaminated soil for incubation of 150 days. The amendment using FAB elevated soil pH and reduced soil electric conductivity and the release of soil dissolved organic carbon. After the addition of 3%w/w FAB (FAB3%), the bioavailability of Pb, Cd, and As decreased to 9.2, 57.5, and 7.6 mg/kg, respectively, which were 96%, 47%, and 36% lower than that of the control soil (CK). The exchangeable Pb and Cd and specifically sorbed As were transformed into residual Pb, carbonate- and Fe-Mn oxide-bound Cd, and well-crystallized Fe-Al oxide-bound As, respectively. The diversity of soil bacterial community increased after FAB treatment. Dynamic leaching and first-order attenuation simulation experiments showed that FAB3% can shorten the leaching time of heavy metals in real soil to 3–6 years, whereas that in CK soil was 12–15 years. X-Ray adsorption near edge structure analysis showed that FAB immobilized heavy metals in soil by forming pyromorphite coprecipitate with Pb(II), ion exchange between Cd(II) and Ca(II) in the hydroxyapatite component, and complexation between the ferrihydrite component and As(V). © 2022, The Authors. All rights reserved.

关键词： Heavy metals

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Synergical Effects of Nb and Sio2 on Enhanced No Elimination and Sulfur Resistance of Fe2o3-Scr Catalyst

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SSRN 2024年

作者： Zhao, Wenrui Li, Lulu Jiang, Peiting Zou, Weixin College of Environmental and Chemical Engineering Jiangsu University of Science and Technology Zhenjiang212000 China State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Jiangsu Key Laboratory of Vehicle Emissions Control Nanjing University Nanjing210023 China College of Environmental and Chemical Engineering Jiangsu University of Science and Technology Zhenjiang212000 China

Fe2O3-based catalysts have attracted increasing interests for their use in NH3-SCR (selective catalytic reduction) reaction, while the wide application of Fe2O3-based catalysts is limited by its unsatisfying NO conversion at low temperature and poor anti-SO2 ability. In this study, by virtue of FeSi composite oxide with large specific surface area as support obtained by doping Si into pristine Fe2O3, and NbOx species was used for surface modification to improve its NH3-SCR activity. The optimal Nb/FeSi catalyst exhibited over 90% NO conversion in the temperature interval of 250-400 oC and displayed excellent SO2 resistance at 225 oC. For the contribution of different components to the catalytic activity, Si contributes large specific surface area and more Brønsted acid sites, facilitating the dispersion of active components and the activation of NH3 species. Nb could promote the generation of more oxygen vacancies and abundant Brønsted acid sites while inhibits the adsorption of NOx. © 2024, The Authors. All rights reserved.

关键词： Selective catalytic reduction

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Lanthanide Mofs Based Portable Fluorescence Sensing Platform: Quantitative and Visual Detection of Ciprofloxacin and Al3+

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SSRN 2023年

作者： Meng, Shuang Liu, Jiaxiang Yang, Yuanyuan Mao, Shun Li, Zhuo State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science & Engineering Shanghai Institute of Pollution Control and Ecological Security Tongji University 1239 Siping Road Shanghai200092 China Shanghai Advanced Research Institute Chinese Academy of Sciences Shanghai200120 China

In the current context of water environmental monitoring and pollution control, there's a crucial need for rapid and simple methods to detect multi-pollutant. We herein report an easy one-step hydrothermal synthesis method to produce Eu-based metal-organic frameworks (Eu MOFs), which was used as a fluorescent probe to detect the aquatic environmental pollutants of ciprofloxacin (CIP) and aluminum ions (Al3+). This fluorescent sensor enabled the cascade detection of CIP and Al3+ through fluorescence enhancement and ratio fluorescence response, respectively. The introduction of CIP significantly turned on the characteristic fluorescence of Eu MOFs at 595 nm and 616 nm through the "antenna effect". Based on this, the sensor enables quantitative detection of CIP within a linear range of 0-120 μM with a LOD as low as 50.421 nM. In the presence of Al3+, the fluorescence emission of Eu MOFs-CIP was sharply turned off due to strong Al3+ coordination with CIP, while the blue fluorescence emission of CIP was remarkably enhanced. And thus allowing ratio fluorescence quantitative detection of Al3+ (LOD = 2.681 μM). The introduction of CIP and Al3+ in cascade resulted in distinct fluorescence color changes from colorless to red and eventually to blue, exhibiting pronounced fluorescence characteristics. This observable phenomenon enables the visual detection of CIP and Al3+ in both liquid phase and paper test strips. By combining the analysis of fluorescence chromaticity with the use of a smartphone, the test paper fluorescence color allows for simple quantitative determination, which provides a convenient and accessible approach for quantifying CIP and Al3+ in water environments. © 2023, The Authors. All rights reserved.

关键词： Fluorescence

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Overlooked Oxidative Role of Ni(Iii) in the Enhanced Mineralization of Ni(Ii)–Edta Complex by Ozonation

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SSRN 2022年

作者： Zong, Yang Ji, Wenjie Xie, Yu 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

The mineralization of organic pollutant by O3 is prone to be restricted by the accumulative production of hydroxyl radical (•OH)-recalcitrant oxalate (OA). Herein, it was interestingly found that the presence of 0.5 mM Ni(II) enhanced the mineralization efficiency of EDTA by O3 under alkaline conditions by 22.8%, and the promoting effect of Ni(II) augmented with the increased loading of Ni(II). Based on the results from scavenging experiment, chemical probe detection and XPS characterization, it was verified that except for the commonly recognized reactive oxidants (i.e., •OH and O3) in EDTA mineralization, the overlooked Ni(III) species (i.e., NiOOH) also played an indispensable role in the enhanced mineralization of EDTA. The Ni(III) species was formed via the oxidation of decomplexed Ni(II) by •OH and in turn collaborated with •OH to decompose EDTA. More importantly, the generated Ni(III) species exerted higher affinity towards •OH and O3-resistent oxalate, hence elevating EDTA mineralization. This study elucidated the significant role of Ni(III) species in enhancing the mineralization efficiency of EDTA, and also proposed a new insight into promoting the treatment performance of ozonation via the collaborative oxidation mechanism-co-mediated by •OH and Ni(III) species. © 2022, The Authors. All rights reserved.

关键词： Ozonization

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