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Enhanced oil/water separation using superhydrophobic nano SiO2-modified porous melamine sponges

Chemosphere 2024年 369卷 143879页

作者： Chen, Yongsheng Xue, Yi Ma, Sijia Shi, Haochuan Wang, Yanru Ren, Hongqiang Xu, Ke State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University Jiangsu Nanjing210023 China

Recent advancements in functional sponge materials have garnered significant interest due to their efficacy and cost-effectiveness in oil spill remediation. This study introduces both silane coupling agent (methyltrichlorosilane and 3-aminopropyltriethoxysilane) and nano-SiO₂ particles into the melamine sponge framework via impregnation. Additionally, polydimethylsiloxane (PDMS) serves a crucial role in curing to fuse the substrate with the coating through robust covalent bonds. The modified sponges (SiMAPs) facilitate the formation of rough surfaces comprising hierarchical structures by the deposition of nano-SiO₂ particles, while the silane coupling agents and PDMS contribute to a reduced surface energy. These SiMAP sponges maintain high stability with a water contact angle of 162.6° and demonstrate an adsorption capacity ranging from 40 to 90 times their weight in oil or organic solvents. Furthermore, they achieve a separation efficiency exceeding 98% and an oil flux of 14.38 L/m2∙s in immiscible oil-water mixtures. Additionally, the sorption of trichloromethane reaches 88.1 g/g, and the separation efficiency for surfactant-stabilized emulsions containing diesel is 62.8%. Remarkably, the oil-water separation efficiency surpasses 99.8% in dynamic continuous oil-water separation cycles, as evidenced by 20 experimental trials. These results underscore the substantial potential of SiMAP-modified sponges for addressing oil pollution by enhancing oil-water separation. © 2024

关键词： Demulsification

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Occurrence, partition behavior, source and ecological risk assessment of nitro-PAHs in the sediment and water of Taige Canal, China

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Journal of Environmental Sciences 2023年第2期124卷 782-793页

作者： Jijie Kong Tao Ma Xiaoyu Cao Weidi Li Fengxiao Zhu Huan He Cheng Sun Shaogui Yang Shiyin Li Qiming Xian School of Environment Nanjing Normal UniversityNanjing 210023China School of Geography Nanjing Normal UniversityNanjing 210023China The State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China Fujian Provincial Key laboratory of Eco-Industrial Green Technology College of Ecological and Resource EngineeringWuyi UniversityWuyishan 354300China Nanjing Institute of Environmental Sciences Ministry of Ecology and EnvironmentNanjing 210042China

Nitrated polycyclic aromatic hydrocarbons(NPAHs)are widespread organic pollutants that possess carcinogenic and mutagenic properties,so they may pose a risk to the environment and human *** this study,the concentrations of 15 NPAHs and 16 polycyclic aromatic hydrocarbons(PAHs)in 30 surface water samples and 26 sediment samples were measured in 2018 from the Taige Canal,one of the main rivers flowing into Taihu Lake,*** total NPAH concentrations in water and sediment ranged from 14.7 to 235 ng/L and 22.9 to 96.5 ng/g dw,respectively.9-nitrophenanthrene(nd–76.3 ng/L)was the dominant compound in surface water,while 2+3-nitrofluoranthene(1.73–18.1 ng/g dw)dominated in *** PAHs,concentration ranging from 1,097 to 2,981 ng/L and 1,089 to 4,489 ng/g dw in surface water and sediment,*** was a strong positive correlation between the log octanol-water partition coefficient(Kow)and log sediment-water partition coefficient due to hydrophobic *** fugacity fraction value increased with the decrease of log Kow,and chrysene was transferred from water into *** residual NPAHs in surface water and sediment of the Taige Canal have partial *** engine and coal combustion emissions were probably the principal sources of NPAHs in surface water and *** results of ecological risk assessment showed that some NPAHs inwater(e.g,1-nitropyrene and 6-nitrochrysene)and sediment(e.g.,2-nitrobiphenyl,5-nitroacenaphthene,9-nitrophenanthrene and 2+3-nitrofluoranthene)had moderate ecological risks,which should be of concern.

关键词： Nitrated polycyclic aromatic hydrocarbons(NPAHs) Occurrence Partition behavior Source apportionment Ecological risk assessment

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A study on singlet oxygen generation for tetracycline degradation via modulating the size ofα-Fe_(2)O_(3)nanoparticle anchored on g-C_(3)N_(4) nanotube photocatalyst

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Nano Research 2023年第2期16卷 2236-2244页

作者： Hongjie Zhu Minghui Li Luning Zou Youyou Hu Hongguo Hao Jianmin Dou Junjie Mao Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology School of Chemistry and Chemical EngineeringLiaocheng UniversityLiaocheng 252059China Key Laboratory of Functional Molecular Solids Ministry of EducationCollege of Chemistry and Materials ScienceAnhui Normal UniversityWuhu 241002China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China Gaotang liguo chemical plant Liaocheng 252059China

Photocatalysis is considered as an effective technique for mitigating ecological risks posed by residual tetracycline(TC).To improve the efficiency of this technique,it is necessary to enable photocatalysts to produce highly reactive species,such as singlet oxygen(1O2).However,due to the high activation energy of 1O2,photocatalysts can hardly produce 1O2 without assistance from external ***,we find that the size-reducedα-Fe_(2)O_(3)nanoparticles(~4 nm)that anchored on g-C_(3)N_(4)nanotube(α-Fe_(2)O_(3)@CNNT)can spontaneously generate ^(1)O_(2) for degradation of *** comparison,only hydroxyl radical(·OH)can be produced by g-C_(3)N_(4)nanotube loaded with~14 nmα-Fe_(2)O_(3)nanoparticles(α-Fe_(2)O_(3)/CNNT).Owing to the high reactivity of the ^(1)O_(2) species,the photocatalytic degradation rate(Kapp)of TC withα-Fe_(2)O_(3)@CNNT(0.056 min^(−1))was 1.8 times higher than that ofα-Fe_(2)O_(3)/*** experimental results and theoretical calculations suggested that reducing the size ofα-Fe_(2)O_(3)nanoparticles anchored on g-C_(3)N_(4)nanotube decreased the surface electron density ofα-Fe_(2)O_(3),which induces the generation of high-valent Fe(IV)active sites overα-Fe_(2)O_(3)@CNNT and turns the degradation pathway into a unique ^(1)O_(2) dominated *** study provides a new insight on the generation of ^(1)O_(2) for effective degradation of environmental pollutant.

关键词： singlet oxygen degradation pathway high-valent Fe(IV) tetracycline degradation

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FeCoP sub-nanometric-sheets for electrocatalzing overall water splitting

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Nano Research Energy 2024年第4期3卷 68-76页

作者： Long Zhao Kexin Meng Yibo Guo Qingsheng Wu Quanjing Zhu Tao Zhou Yongqing Fu Ming Wen School of Chemical Science and Engineering School of Environmental Science and EngineeringShanghai Key Laboratory of Chemical Assessment and SustainabilityState Key Laboratory of Pollution Control and Resource ReuseTongji UniversityShanghai 200092China College of Bioengineering East China University of Science and TechnologyShanghai 200237China Faculty of Engineering and Environment Northumbria UniversityNewcastle upon Tyne NE99UK

Renewable electrical energy for electrolysis water can achieve green industrial chains for hydrogen ***,finding efficient electrocatalysts remains a challenge for green ***,sub-nanometric FeCoP nanosheets with average thickness of 0.9 nm is constructed through 2D self-assembly driven by cavitation effect of ultrasonics and following *** from abundant active sites,enhanced H_(2)O molecular adsorption kinetics,and highly enhanced structural stability,the subcrystalline FeCoP shows excellent electrocatalytic activities of hydrogen evolution reaction(HER)and oxygen evolution reactions(OER).Ultralow overpotential of 37 mV is achieved at 10 mA·cm^(-2) for *** the FeCoP catalyst was used as both cathode and anode for overall water splitting using renewable electrical energy,green hydrogen produced is directly applied for hydrogen fuel cell to drive fan for more than 10 *** calculation indicates that subcrystalline FeCoP more easily adsorbs H_(2)O than crystalline one and thus speeds up the kinetics of Volmer step in HER process.

关键词： green hydrogen energy subcrystalline overall water splitting sub-nanometric-sheets

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Mechanism of stabilized sludge-driven remediation in saline-alkali soil: New insights from salt-discharge capacity and microbially mediated carbon/nitrogen cycles

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Science of the Total Environment 2024年 957卷 177588页

作者： Gao, Jun Tian, Haining Dong, Bin Xu, Zuxin State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and Engineering Tongji University Shanghai200092 China

Stabilized sludge products (SSP) are promising conditioners for saline-alkali soils, capable of enhancing soil physicochemical properties and stimulating microbial communities. However, there is limited knowledge regarding the effects of SSP on soil salt-discharge capacity and carbon/nitrogen cycles. Here, a six-month incubation experiment was conducted to evaluate SSP (0 % ~ 60 %) on saline-alkali soil properties, salt leaching, and microbial functions. It was found that after SSP (≥30 %) treatment, saline-alkali soils were significantly remediated (p + leaching rate increased from 1.1 % to 53.3 % ~ 79.3 %, indicating a substantial improvement in salt-discharge capacity. Correlation analysis revealed that SSP organics loosened pore spaces by promoting soil particle agglomeration, which in turn improved salt-discharge capacity. Further, the 30 % SSP significantly increased the microbial functions involved in nutrient cycling, such as carbon fixation (photosynthetic pathway), nitrogen fixation, dissimilatory nitrate reduction, and nitrification (p © 2024 Elsevier B.V.

关键词： Carbon sequestration

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In-situ synthesis of layered double hydroxides with tunable basal spacing for efficient iodide over iodate adsorption selectivity

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Science China Chemistry 2025年第6期 2424-2432页

作者： Xiaolu Liu Muliang Xiao Pei Chen Yilun Zhou Yinghui Xie Mengjie Hao Liang Mao Hui Yang Geoffrey I.N.Waterhouse Shengqian Ma Xiangke Wang College of Environmental Science and Engineering North China Electric Power University State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University School of Chemical Sciences the University of Auckland Department of Chemistry University of North Texas

Separating I3-and IO3-from aqueous solutions is technically challenging due to their very similar charge density. Herein, we describe the in-situ synthesis of cobalt-based layered double hydroxides（Co-LDHs） by decomposition of zeolite imidazole framework（ZIF） nanocrystals, whilst modulating the basal spacing in the Co-LDHs through anion intercalation（such as Br-,NO3-, and Cl O4-）. Co-LDH-NO3-possesses an optimal basal spacing of ～4.69 ?, which is slightly smaller than the van der Waals diameter of IO3-（～4.79 ?）, thus enabling selective adsorption of linear I3-（diameter ～4.22 ?） via ion exchange in the LDH interlayer. Co-LDH-NO3-showed ultrafast I3-uptake kinetics involving strong “host-guest” interaction forces, achieving high dynamic uptake capacities of 119.94 and 127.18 mg/g in I3-/IO3-contaminated groundwater and tap water, respectively, and～100% separation efficiencies towards I3-over IO3-. Co-LDH-Br-with a smaller basal spacing（4.06 ?） exhibited much slower separation kinetics, and Co-LDH-ClO4-with a ～5.36 ? basal spacing demonstrated poor separation efficiency under similar conditions. Ab initio molecular dynamics（AIMD） simulations were used to visually simulate the ion exchange process, with the results being consistent with the experimental observations. Furthermore, Co-LDH-NO3-demonstrated excellent reusability during dynamic breakthrough tests and I3-/IO3-separation cycles due to a “special memory effect” of the 2D interlayer. This work guides adsorbent design for the efficient removal and separation of iodine species from contaminated water.

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Toward Systemic Thinking in Managing Environmental Risks

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Engineering 2021年第11期7卷 1518-1522页

作者： Jun Bi Jianxun Yang Miaomiao Liu Zongwei Ma Wen Fang State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China

*** The world today is strongly *** interdependent and complex networks have been formed between environmental,economic,and social systems,through which people,resources,materials,goods,and information are exchanged at unprecedented speeds[1].At the same time,however,such networks are profoundly changing the global risk landscape and making the whole system more vulnerable[2].In particular,there is a growing concern about cascading and systemic *** such cases,a localized initial damaging event(e.g.,the coronavirus disease 2019(COVID-19)pandemic)can spread rapidly and globally,resulting in disruptive influences and countless societal costs[3].

关键词： networks globally aging

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Effect of nitrite on hydrolysis-acidification, biogas production and microbial community in semi-continuous two-phase anaerobic digestion of sewage sludge

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Journal of Environmental Sciences 2023年第4期126卷 434-444页

作者： Qian Sheng Yiqing Lu Shijie Yuan Xiaowei Li Xiaohu Dai Yali Guo Bin Dong State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China School of Environmental and Chemical Engineering Organic Compound Pollution Control EngineeringMinistry of EducationShanghai UniversityShanghai 200444China Shanghai Investigation Design&Research Institute Co.Ltd. Shanghai 200335China YANGTZE Eco-Environment Engineering Research Center China Three Gorges CorporationBeijing 100038China

Previous study found that the pre-treatment of sewage sludge with nitrite improves the biogas production during the mono/two-phase anaerobic digestion (AD) using batch biochemical methane potential *** this study,the effects of nitrite on hydrolysisacidification,biogas production,volatile solids destruction and microbial composition in semi-continuous two-phase AD of sewage sludge were *** addition of nitrite promotes sludge organic matter solubilization (+484%) and VFAs production (+98.9%),and causes an increase in the VS degradation rate during the AD process (+8.7%).The comparison of biogas production from the acidogenic and methanogenic reactors with or without the addition of nitrite implies that the nitrite has no significant effect on the overall biogas production of two-phase sludge AD ***-throughput sequencing analysis shows that the microbial communities of bacteria and archaea in two-phase AD reactors significantly changes after the addition of *** (bacteria) and Candidatus Methanofastidiosum (archaea) become the dominant genera in the acidogenic and methanogenic reactors with the nitrite *** findings provide new insights about using nitrite to promote the organic matter degradation of sewage sludge in a semicontinuous two-phase AD system.

关键词： Sewage sludge Bioenergy Methane production Nitrite Semi-continuous two-phase anaerobic digestion

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Evaluation of N-acetylcysteine and glutathione as quenching agents for the analysis of halogenated disinfection by-products

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Journal of Environmental Sciences 2022年第7期34卷 71-79页

作者： Shunke Ding Menglin Wu Rong Xiao Chao Fang Qi Wang Bin Xu Wenhai Chu State Key Laboratory of Pollution Control and Resource Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Key Laboratory of Yangtze River Water Environment Ministry of EducationTongji UniversityShanghai 200092China School of Life and Environmental Science Wenzhou UniversityZhejiang 325035China

Disinfection by-products(DBPs), formed from the reactions of disinfectants with natural organic matter and halides in drinking water, were considered to be cytotoxic and genotoxic, and might trigger various cancers. The relatively low concentration of DBPs in finished water(low μg/L or even ng/L levels) and the interference from water matrix inhibited in situ determination of DBPs. Moreover, the further formation and degradation of DBPs by disinfectants during the holding time(several hours to several days) from sample collection to analysis could adversely affect the determination of DBPs. To obtain accurate, precise and reliable data of DBP occurrence and formation, robust and reliable sample preservation is indispensable. However, the commonly used quenching agents(e.g., sodium sulfite, sodium thiosulfate, and ascorbic acid) for sample preservation can decompose reactive DBPs by reductive dehalogenation. This study evaluated the performance of N-acetylcysteine(NAC) and glutathione(GSH) as quenching agents for the analysis of halogenated DBPs by investigating the stoichiometry of the disinfectant-quenching agent reaction, the formation of DBPs during chlor(am)ination of NAC or GSH, and the effects of NAC or GSH on the stability of 18 individual DBPs and total organic halogen(TOX). Based on the results of this study, NAC and GSH were considered to be ideal quenching agents for the analysis of most DBPs and TOX, except halonitromethanes.

关键词： Disinfection by-products Total organic halogen Quenching agents N-acetylcysteine Glutathione

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Highly stable carbon-coated nZVI composite Fe0@RF-C for efficient degradation of emerging contaminants

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Environmental Science and Ecotechnology 2024年第6期22卷 233-244页

作者： Guizhou Xu Lin Sun Yizhou Tu Xiaolei Teng Yumeng Qi Yaoyao Wang Aimin Li Xianchuan Xie Xueyuan Gu State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing210023China Key Laboratory of Poyang Lake Environment and Resource Utilization Engineering Research Center of Watershed Carbon NeutralizationMinistry of EducationSchool of Resource and EnvironmentNanchang UniversityNanchang330031China Nanjing University&Yancheng Academy of Environment Protection Technology and Engineering Nanjing210023China Jiangxi Nanxin Environmental Protection Technology Co.LTD Jiujiang CityJiangxi Province330300China

Nanoscale zerovalent iron(nZVI)has garnered significant attention as an efficient advanced oxidation activator,but its practical application is hindered by aggregation and *** nZVI with carbon can effectively addresses these issues.A simple and scalable production method for carbon-coated nZVI composite is highly *** anti-oxidation and catalytic performance of carbon-coated nZVI composite merit in-depth *** this study,a highly stable carbon-coated core-shell nZVI composite(Fe0@RF-C)was successfully prepared using a simple method combining phenolic resin embedding and carbothermal ***0@RF-C was employed as a heterogeneous persulfate(PS)activator for degrading 2,4-dihydroxybenzophenone(BP-1),an emerging *** to commercial nZVI,Fe0@RF-C exhibited superior PS activation performance and oxidation *** 95%of BP-1 was removed within 10 min in the Fe0@RF-C/PS *** carbon layer promotes the enrichment of BP-1 and accelerates its degradation through singlet oxygen oxidation and direct electron transfer *** study provides a straightforward approach for designing highly stable carbon-coated nZVI composite and elucidates the enhanced catalytic performance mechanism by carbon layers.

关键词： Nanoscale zerovalent iron Carbon-coated nZVI Persulfate BP-1 Enhanced degradation

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