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Sex-dependent effects of rice cadmium exposure on body weight, gut microflora, and kidney metabolomics based on a mouse model

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SCIENCE OF THE TOTAL ENVIRONMENT 2024年 908卷 168498页

作者： Yang, Jin-Lei Chen, Shan Xi, Jin-Feng Lin, Xin-Ying Xue, Rong-Yue Ma, Lena Q. Zhou, Dongmei Li, Hong-Bo Nanjing Univ Sch Environm State Key Lab Pollut Control & Resource Reuse Jiangsu Key Lab Vehicle Emiss Control Nanjing 210023 Peoples R China Zhejiang Univ Inst Soil & Water Resources & Environm Sci Coll Environm & Resource Sci Hangzhou 310058 Peoples R China

Consumption of cadmium (Cd) contaminated rice is the main dietary source of Cd exposure and toxicity. To protect humans from Cd toxicity, it is pivotal to fully understand the sex-dependent toxicity of subchronic rice-Cd exposure. However, the sex-dependent effects of subchronic rice-Cd exposure on body weight gain, gut microflora, and kidney metabolomics are still unclear. In this study, a Cd-free and a Cd-contaminated rice (0.005 and 0.74 mg Cd kg(-1)) were fed to both female and male mice for one month, with changes in body weight gain, Cd accumulation in tissue, bone mineral concentration, expression of intestinal channels involving in Cd and calcium (Ca) absorption, gut microbiota, and kidney metabolites assessed for both genders. Results showed that female mice had normal body weight gain after rice-Cd exposure, while body weight of male mice was decreased from 19.8 to 17.5 g over the one-month consumption of the Cd-contaminated rice (0.74 mg kg(-1)), suggesting specific toxicity on growth of male mice. Rice-Cd exposure had limited effects on gut microbiota for both genders. However, higher Cd accumulation in liver and femur was observed in male mice than in females, which may be due to higher intestinal expression of Ca channels involving in intestinal Cd absorption in male mice with rice-Cd exposure. Greater risk of osteoporosis was also observed in male mice. In addition, kidney metabolomic profiling showed special disruption of adrenocortical hormone homeostasis for male mice with rice-Cd exposure. Particularly, expression of cortisol in kidneys of male mice was elevated 37.1-fold with rice-Cd exposure, likely resulting in Cushing's syndrome and contributing to growth retardation. This study advances our understanding of the sex-dependent toxicity of rice-Cd exposure, and highlights the priority of protecting males from the adrenocortical hormone disrupting effects of rice-Cd exposure.

关键词： Cadmium Rice Mice Sex -dependent toxicity Gut microflora Kidney metabolomics

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Research Hotspots and Trend Analysis in Modeling Groundwater Dense Nonaqueous Phase Liquid Contamination Based on Bibliometrics

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WATER 2024年第19期16卷 2840-2840页

作者： Ju, Mengdie Li, Xiang Wu, Ruibin Xu, Zuxin Yin, Hailong Tongji Univ Key Lab Urban Water Supply Water Saving & Water En Minist Water Resources Shanghai 200092 Peoples R China Tongji Univ State Key Lab Pollut Control & Resource Reuse Res Shanghai 200092 Peoples R China

Groundwater contamination by dense nonaqueous phase liquids (DNAPLs) poses a severe environmental threat due to their persistence and toxicity. Modeling DNAPL contamination is essential for understanding their distribution, predicting contaminant spread, and developing effective remediation strategies, but it is also challenging due to their complex multiphase behavior. Over the past few decades, researchers have developed various models, including multiphase flow, mass transfer, and solute transport models, to simulate the distribution of DNAPLs. To understand the research trends in DNAPL modeling in groundwater, a bibliometric analysis was conducted using CiteSpace based on 614 publications from the WoS Core Collection database (1993-2023). The publications were statistically analyzed, and the research hotspots and trends were summarized. The statistical analysis of the publications indicates that the United states is leading the international research on DNAPL models, followed by China and Canada;the collaboration between countries and disciplines in this field needs to be strengthened. keyword clustering and burst detection reveal that the current research hotspots focus on multiphase flow models, mass transfer models, back diffusion, and practical applications of the models;the research trends are centered on back diffusion mechanisms, the characterization of contamination source zones, and prediction of the contaminant distribution at real-world sites, as well as optimization of the remediation strategies.

关键词： dense nonaqueous phase liquids mathematical model bibliometrics multiphase flow groundwater

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Co-substrate promoting the biodegradation of refractory DOM in semi-coking wastewater: DOM evolution and microbial community

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JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 2023年第1期11卷

作者： Cai, Min -Hui Tian, Ye -Chao Li, Ai-Min Li, Yan Han, Yu-Ze Li, Jun Sun, Hong-Fang Wang, Xin Zhou, Qing Li, Wen-Tao Nanjing Univ Sch Environm State Key Lab Pollut Control & Resources Reuse Nanjing 210023 Peoples R China Nanjing Univ Sci & Technol Sch Environm & Biol Engn Jiangsu Key Lab Chem Pollut Control & Resources Re Nanjing 210094 Peoples R China

Semi-coking wastewater treatment has become a difficult issue because of its complexity, heterogeneity and toxicity. In this study, co-metabolism with ethanol or sodium acetate as co-substrates was applied to improve the biological degradation of refractory dissolved organic matter (DOM) in semi-coking wastewater. Kinetic model simulation results indicated that both co-substrates addition improved COD removal efficiency and biodegradation rate. Excitation-emission matrix (EEM) spectroscopy and size exclusion chromatography with organic carbon detector (SEC-OCD) analysis were applied to evaluate the DOM biodegradation in terms of fluorescence and molecular weight (MW). Although co-substrates resulted in a comparable enhanced removal efficiency of protein-like and humic-like fluorophores, there are distinct differences in their specific protein-like fluorescent peaks (Peak C1&C2). Ethanol addition was more conducive to the removal of humic substance with apparent molecular weight (AMW) ranging from 1.1 kDa to 20 kDa. Acetate addition resulted in higher removal of building blocks of humic substances (BB, AMW 0.45-1.1 kDa) and proteinaceous biopolymers (BP, AMW >20 kDa). Co-metabolism triggered the shift of microbial community structure and metabolic functions. Using cooccurrence network analysis, nine keystone genera were identified, which maintained the functional stability of bacterial community responding to organic toxicants stress. LefSe analysis elucidated that the potential major genera involved in refractory organics biodegradation with acetate addition were Stenotrophomonas (40.3%) and Pseudomonas (21.2%), while Pseudoxanthomonas (10.4%) with ethanol addition. Phylogenetic investigation of communities by reconstruction of unobserved states (PICRUSt2) analysis showed that benzoate, styrene, xylene and naphthalene degradation pathway were enhanced by acetate addition as compared to ethanol.

关键词： Co-metabolism Refractory dissolved organic matter Size exclusion chromatography PICRUSt2 analysis Microbial community structure

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Promoted electrochemical degradation of triclosan with persulfate on Fe-Ni oxide modified graphite felt cathode

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SEPARATION AND PURIFICATION TECHNOLOGY 2024年 344卷

作者： Teng, Xiaolei Wang, Zunyao Abukhadra, Mostafa R. Mahmoud, Rehab Khaled Qu, Ruijuan Nanjing Univ Sch Environm State Key Lab Pollut Control & Resources Reuse Nanjing 210023 Jiangsu Peoples R China Beni Suef Univ Fac Sci Mat Technol & Their Applicat Lab Beni Suef City Egypt

Advanced oxidation processes (AOPs) based on persulfate (PS) have shown great potential in wastewater treatment. In this work, FeNiO-modified Graphite felts (GF) cathodes (FeNiO/GF) were prepared to construct an activation system for electrochemical activation of persulfate (EA -PS). The effect of condition parameters (current density, PS concentration and pH) on the degradation of triclosan (TCS) in the EA-FeNiO/GF-PS system was investigated. The results showed that FeNiO loaded on the GF enhanced the cathodic activation of PS. The EAFeNiO/GF-PS system showed excellent degradation of various pollutants at PS concentration of 1.0 mM and current density of 10 mA/cm 2 . Electron paramagnetic resonance and free radical quenching experiments showed that center dot OH, SO 4 center dot - , O 2 center dot - and 1 O 2 all contributed to the degradation of triclosan (TCS), with SO 4 center dot - and center dot OH being the major free radicals. The electrochemical performance tests and the XPS characterization of the FeNiO electrode results demonstrated that the valence cycling of Fe and Ni was accelerated under the action of an electric field. In addition, FeNiO/GF had excellent reusability and was unaffected by the actual water matrices. This study provided an effective strategy for the degradation of organic pollutants in water treatment.

关键词： Electrochemical activation Persulfate Layered double oxides Kinetics Reaction mechanism

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Selective hydrodeoxygenation of polyethylene terephthalate plastic wastes into 1;4-dimethylcyclohexane by Ir-ReO_(x)/SiO_(2)+HZSM-5 catalytic system

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Science China Chemistry 2025年第4期68卷 1563-1575页

作者： Nan Wang Jieyi Liu Junde Wei Sibao Liu Guozhu Liu Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and Technology Tianjin 300072China Engineering Research Center of Polymer Green Recycling of Ministry of Education Fujian Key Laboratory of Pollution Control&Resource ReuseCollege of Environmental and ResourcesFujian Normal UniversityFuzhou 350007China Haihe Lab of Sustainable Chemical Transformations Tianjin 300192China

In order to mitigate the environmental impact of polyethylene terephthalate(PET)plastic pollution and enhance waste resource utilization;we developed a novel Ir-ReO_(x)/SiO_(2)+HZSM-5 catalytic system for the hydrodeoxygenation(HDO)of PET plastic wastes into cycloalkanes;particularly 1;4-dimethylcyclohexane(DMCH).Under mild conditions(190℃;3 MPa H_(2))with a certain amount of water in cyclopentane solvent;the highest yield of DMCH reached 95.8%;contributing to an overall yield of cycloalkanes at 98.4%within a reaction time of 4 h from HDO of virgin *** HDO of PET into DMCH involved initial hydrogenation of PET aromatic ring;then depolymerized by direct hydrogenolysis of acyl C-O bond in the ester group and subsequent cascade HDO of alcoholic C-O bond to saturated ester and alcohol intermediates;and further HDO of these oxygenates converting into desired DMCH *** Ir-ReO_(x)/SiO_(2) catalyst exhibits fully reduced metallic Ir nanoparticles along with partially reduced ReO_(x) species that are highly dispersed on both SiO_(2) surface and Ir nanoparticle *** oxophilic nature of ReO_(x) species facilitates the activation of C-O bonds;the acidic HZSM-5 zeolite for the promotion of dehydration reaction;and the protic property of H_(2)O for the enhancement of hydrogenation PET contributed to highly HDO activity of this ***;the catalytic system is applicable for the HDO of diverse real-world PET plastic wastes including Coca-ColaTM bottles;green Sprite bottles and white and red discarded fiber cloths;generating DMCH with a yield of up to 95.9%and cycloalkanes with a yield of up to 99.5%.This innovative process presents a new avenue for efficient hydrodeoxygenation conversion of PET into easily separable DMCH which serves as a crucial building block for the production of terephthalic acid to realize the chemical recycling of PET plastic wastes towards a green circular economy.

关键词： plastic wastes PET hydrodeoxygenation cycloalkane Ir-ReO_(x)/SiO_(2)

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Unravelling relationships between fluorescence spectra, molecular weight distribution and hydrophobicity fraction of dissolved organic matter in municipal wastewater

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CHEMOSPHERE 2022年第Part3期308卷 136359页

作者： Ji, Wen-Xiang Tian, Ye-Chao Li, Ai-min Gu, Xiao-Ming Sun, Hong-Fang Cai, Min-Hui Shen, Shan-Qi Zuo, Yan-Ting Li, Wen-Tao Nanjing Univ Sch Environm State Key Lab Pollut Control & Resources Reuse Nanjing 210023 Peoples R China

The characteristics of dissolved organic matter (DOM) in the influent and secondary effluent from 6 municipal wastewater treatment plants (WWTPs) were investigated with a size exclusion chromatogram (SEC) coupled with multiple detectors to simultaneously detect ultraviolet absorbance, fluorescence, dissolved organic carbon (DOC) and dissolved organic nitrogen (DON) as a function of molecular weight (MW). The SEC chromatograms showed that biopolymers (>6 kDa) and humic substances (0.5-6 kDa) comprised the significant fraction in the influent, while humic substances became the abundant proportion in the secondary effluent. Direct linkages between MW distribution and hydrophobicity of DOM in the secondary effluent were further explored via SEC analysis of XAD resin fractions. DON and DOC with different hydrophobicity exhibited significantly distinct MW distribution, indicating that it was improper to consider DOC as a surrogate for DON. Different from DOC, the order of averaged MW in terms of DON was hydrophobic neutral transphilic neutral > hydrophobic acid > transphilic acid > hydrophilic fraction. Fluorescence spectral properties exhibited a significant semi-quantitative correlation with MW and hydrophobicity of DOC, with Pearson's coefficients of -0.834 and 0.754 (p < 0.01) for biopolymer and humic substances. Meanwhile, regional fluorescence proportion was demonstrated to indicate the MW and hydrophobicity properties of DON at the semi-quantitative level. The fluorescence excitation-emission matrix (EEM) could be explored to provide a rapid estimation of MW distribution and hydrophobic/hydrophilic proportion of DOC and DON in WWTPs.

关键词： Dissolved organic matter Size exclusion chromatography Molecular weight distribution Hydrophobic/hydrophilic fractionation Fluorescence property

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Distinct Efficacies of Interlayers in Tailoring Polyamide Nanofiltration Membrane Performance for Organic Micropollutant Removal: Dependent on Substrate Characteristics

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ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024年第31期58卷 14022-14033页

作者： Cheng, Peng Liu, Yanling Wei, Xinxin Fan, Kaiming Xia, Shengji Tongji Univ Tongji Adv Membrane Technol Ctr State Key Lab Pollut Control & Resources Reuse Shanghai 200092 Peoples R China Tongji Univ Key Lab Yangtze River Water Environm Minist Educ Shanghai 200092 Peoples R China

Interlayered thin-film nanocomposite (TFN) membranes have shown the potential to boost nanofiltration performance for water treatment applications including the removal of organic micropollutants (OMPs). However, the effects of substrates have been overlooked when exploiting and evaluating the efficacy of certain kinds of interlayers in tailoring membrane performance. Herein, a series of TFN membranes were synthesized on different porous substrates with identical interlayers of metal-organic framework nanosheets. It was revealed that the interlayer introduction could narrow but not fully eliminate the difference in the properties among the polyamide layers formed on different substrates, and the membrane performance variation was prominent in distinct aspects. For substrates with small pore sizes exerting severe water transport hindrance, the introduced interlayer mainly enhanced membrane water permeance by affording the gutter effect, while it could be more effective in reducing membrane pore size by improving the interfacial polymerization platform and avoiding PA defects when using a large-pore-size substrate. By matching the selected substrates and interlayers well, superior TFN membranes were obtained with simultaneously higher water permeance and OMP rejections compared to three commercial membranes. This study helps us to objectively understand interlayer efficacies and attain performance breakthroughs of TFN membranes for more efficient water treatment.

关键词： nanofiltration thin-film nanocomposite interlayers porous substrates organic micropollutants

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Efficient removal of per- and polyfluoroalkyl substances by a metal-organic framework membrane with high selectivity and stability

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WATER RESEARCH 2024年 265卷 122276页

作者： Zhang, Kunpeng Cheng, Peng Liu, Yanling Xia, Shengji Tongji Univ Tongji Adv Membrane Technol Ctr State Key Lab Pollut Control & Resources Reuse Shanghai 200092 Peoples R China Tongji Univ Key Lab Yangtze River Water Environm Minist Educ Shanghai 200092 Peoples R China

Per- and polyfluoroalkyl substances (PFAS) in water requires sufficient removal due to their extreme chemical stability and potential health risk. Membrane separation can be a promising strategy, while membranes with conventional structures used for PFAS removal often face challenges such as limited efficiency and stability. In this study, a novel metal-organic framework (MOF) membrane with local modification of polyamide (PA) was developed by introducing interfacial polymerization process during the construction of lamellar membranes with MOF nanosheets. Benefiting from the dense structure and strong negative surface charge, the PA-modified MOF membrane could effectively remove 11 types of PFAS (five short-chain and six long-chain ones with molecular weights ranging from 214.0 to 514.1 Da), especially displaying high rejections for short-chain PFAS (over 84%), along with a remarkable water permeance of 21.4 L & sdot;m-2 & sdot;h-1 & sdot;bar-1. & sdot;m- 2 & sdot;h- 1 & sdot;bar- 1 . The membrane removal characteristics for PFAS were deeply analyzed by elucidating various rejection mechanisms, with particularly distinguishing the rejection and adsorption capacity. Moreover, the membrane stability was significantly enhanced, demonstrated by the structural integrity after 10 min of ultrasonic treatment and stable separation efficiency over 120 h of continuous filtration. With enhanced surface hydrophilicity and negative charge as well as dense membrane pores, the novel membrane also exhibited more superior anti-fouling performance compared to conventional lamellar and PA membranes, further manifesting advantages for practical applications. This work provides a promising solution for developing high-performance membranes tailored specifically for efficient PFAS removal, addressing a critical need in water treatment.

关键词： Nanofiltration membrane Per and polyfluoroalkyl substances Metal-organic frameworks Removal efficiency Interfacial polymerization

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Ecological risks in downstream lakes exacerbated by the three Gorges reservoir

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ECOLOGICAL INDICATORS 2025年 170卷

作者： Chen, Xinxin Guo, Yaxin Zhang, Junhong Han, Xiao Huang, Weiya Yue, Yao South Cent Minzu Univ Coll Resources & Environm Sci Key Lab Resources Convers & Pollut Control State Ethn Affairs Commiss Wuhan 430074 Peoples R China Nanjing Univ Sch Environm State Key Lab Pollut Control & Resource Reuse Nanjing 210023 Peoples R China Wuhan Blue Sky & Green Field Consulting Design Co Wuhan 430070 Peoples R China

River regulation through reservoir construction is one of the greatest challenges to the natural flow state and ecological health of river systems globally. The Three Gorges Dam (TGD), the largest dam in the world, has been in operation since 2003 to regulate water resources downstream. However, most of the current research on the TGD compares the post-2003 hydrologic patterns downstream of the TGD with the pre-2003 hydrologic patterns and lacks direct evidence of the TGD impacts on the downstream areas. In this paper, the ecological impacts of TGD on downstream large lakes are explored in terms of hydrological alteration degree, biodiversity, connectivity, and ecological surplus and ecological deficit by building a 1/2-dimensional nested model to simulate the hydrological processes with and without the TGD from 2008 to 2011. The results showed that (1) TGD storage led to a decrease in the number of high pulses at downstream stations, resulting in wetland degradation in the riverine region;(2) the SI (Shannon's diversity index) based on hydrological calculations became smaller, indicating that the downstream biodiversity showed a decreasing trend;(3) the diversion ratio and the confluence ratio of Dongting Lake and the Yangtze River decreased at the same time, and the connectivity decreased, which would lead to an increase in the degree and frequency of droughts during the dry season;(4) after the regulation of the TGD, the low-risk months were transformed into medium-risk months of the Dongting Lake basin, indicating a deterioration of the ecological situation in this region. The study demonstrates that the construction of the TGD has exacerbated downstream water stress, while the degradation of wetlands and the reduction in biodiversity highlight the heightened pressure on ecological and environmental protection downstream of the TGD. The results of this study provide necessary information for evaluating the impact of the TGD project on large lakes downstream and

关键词： Hydrological alteration Connectivity Biodiversity Ecological surplus and ecological deficit

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Enhancing separation performance of thin film nanocomposite membranes by self-etching of polydopamine-modified calcium carbonate during interfacial polymerization process

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JOURNAL OF MEMBRANE SCIENCE 2025年 715卷

作者： Wei, Xinxin Wang, Xuelin Fan, Kaiming Liu, Yanling Xia, Shengji Tongji Univ Adv Membrane Technol Ctr State Key Lab Pollut Control & Resources Reuse Shanghai 200092 Peoples R China Tongji Univ Key Lab Yangtze River Water Environm Minist Educ Shanghai 200092 Peoples R China Shanghai Inst Pollut Control & Ecol Secur Shanghai Peoples R China

The acid-accepting and gas-generating properties, along with the formation of extensive nanovoids, make CaCO3 nanoparticles attractive as sacrificial nanofillers for fabricating thin-film composite (TFN) nanofiltration membranes. However, challenges such as severe agglomeration and limited acid etching efficiency of the nanoparticles hinder the pursuit of superior membrane performance. In this study, the dispersion and compatibility of CaCO3 nanoparticles within the membrane matrix were improved by modifying them with a polydopamine (PDA) coating. The abundant phenolic hydroxyl groups of PDA enhanced the hydrophilicity and negative charges of membrane surface. Additionally, the PDA capsule increased the etching extent of the CaCO3 nanoparticles by improving the nanoparticle dispersion and generating additional acid, which created sufficient water channels within the polyamide layer. It was demonstrated that incorporating 45 mu g/cm2 of PDA-modified CaCO3 nanoparticles doubled the water permeance to 16.7 LMH/bar, while maintaining a low molecular weight cut-off of 249 Da and achieving rejections over 90 % for five types of per- and polyfluorinated substances. The PDA modification also overcame the membrane stability issue caused by the agglomerated CaCO3 nanoparticles. This study provides a novel strategy for applying properly modified self-etching nanofillers in TFN membrane development, showing great potential for water treatment applications.

关键词： Calcium carbonate Dopamine Thin-film nanocomposite membrane Acid etching per- and polyfluorinated substances

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