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Efficiency,mechanism and microbial community of Cd(Ⅱ)removal by mixed bacteria enriched from heavy metals mine soil

Transactions of Nonferrous Metals Society of China 2022年第10期32卷 3404-3419页

作者： Tao-tao ZENG Xiao-ling ZHANG Hai-du NONG Qing HU Liang-qin WANG Ai-jie WANG Hunan Provincial Key Laboratory of Pollution Control and Resources Reuse Technology University of South ChinaHengyang 421001China Key Laboratory of Environmental Biotechnology Chinese Academy of SciencesBeijing 100085China

Mixed bacteria were enriched from heavy metals mine soil for cadmium(Cd(Ⅱ))-containing wastewater treatment. Batch adsorption experiment results showed that the optimal pH, temperature, initial Cd(Ⅱ) concentration, and biomass dosage were 6.0, 30 ℃, 20 mg/L, and 1 g/L, respectively. Living biomass exhibited better Cd(Ⅱ) removal efficiency(91.97%) than autoclaved biomass(79.54%) under optimal conditions. The isotherms and kinetics of living biomass conformed to the Langmuir isotherm model and pseudo-first-order kinetic model, respectively. FTIR results implied that amine groups, hydroxyl groups and phosphoric acid play an important role in the Cd(Ⅱ) adsorption process, while XRD results showed that crystalline Cd(OH)and CdO were obtained. After Cd(Ⅱ)-containing wastewater treatment exposure, the dominant bacteria genera included Comamonas(39.94%), unclassified_f__Enterobacteriaceae(34.96%), Ochrobactrum(14.07%), Alcaligenes(4.84%), Bordetella(2.07%), Serratia(1.04%), and Bacillus(1.01%). Function prediction showed that the abundance of metabolic genes changed significantly. This study proposes the potential application of mixed bacteria for Cd(Ⅱ)-containing wastewater treatment.

关键词： Cd(Ⅱ) wastewater treatment bacterial community function prediction

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Hydrochar-embedded carboxymethyl cellulose-g-poly(acrylic acid)hydrogel as stable soil water retention and nutrient release agent for plant growth

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Journal of Bioresources and Bioproducts 2022年第2期7卷 34-45页

作者： Yufei Zhang Xinyue Tian Qiuyue Zhang Huifang Xie Bingyu Wang Yanfang Feng Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing 210094China Key Laboratory of Agro-Environment in Downstream of Yangtze Plain Ministry of Agriculture and Rural AffairsInstitute of Agricultural Resources and EnvironmentJiangsu Academy of Agricultural SciencesNanjing 210014China

The cellulose-based hydrogel has been widely applied for soil water retention and nutrient re-lease agents for several *** the inorganic materials into hydrogels is an excellent strategy to improve the inherent limits of the cellulose-based ***,municipal sludge-derived hydrochar(HC)has reduced the environmental burden and offered a potential hydrogel carrier to control water-retention and ***,the above function for plant growth of hydrochar-embedded carboxymethyl cellulose-g-poly(acrylic acid)(CMC-g-PAA/HC)is unknown,and relevant reports are *** study investigated the water retention,nutri-ent release behavior,and effect of germination and plant growth of CMC-g-PAA/HC *** results showed that HC was successfully incorporated into CMC-g-PAA/HC with 6.0%higher thermostability,7.2-21.0%lower swelling ratio(SR)in water,and substantial SR in phosphate solution(P-solution).The water loss rate of CMC-g-PAA/HC in P-solution or wa-ter owned a more significant temperature response(7.9-15.0 folds)than CMC-g-PAA(8.2-10.0 folds).Moreover,4.0%higher n value and more 18.5%released P for CMC-g-PAA/HC were also *** phenomena were due to restricting the polymer chains movement and the wa-ter molecules diffusion inside the hydrogels with *** assessments showed that HC in CMC-g-PAA/HC could effectively alleviate the inhibition effects on rape germination retained with 78.3%germination vigor and 80.0%germination ratio,even dramatically improved plant growth to 28 *** results of this study demonstrated a new route for developing eco-friendly CMC-g-PAA/HC hydrogel,advantageous as a water retention agent and nutrient carrier in arid and semiarid regions.

关键词： Hydrogel Hydrochar Stable phosphorus-release Water retention Plant growth

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Insights into the floatability between spodumene and albite from crystal chemistry standpoint

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International Journal of Mining Science and technology 2022年第6期32卷 1329-1339页

作者： Hepeng Zhou Fanxin Xie Yongbing Zhang Boyuan Zhang Siqi Yang Xianping Luo Engineering Research Center for High-efficiency Development and Application Technology of Tungsten Resources(Jiangxi University of Science and Technology) Ministry of EducationGanzhou 341000China Jiangxi Province Key Laboratory of Mining and Metallurgy Environmental Pollution Control Jiangxi University of Science and TechnologyGanzhou 341000China

Spodumene is a silicate mineral rich in ***,the gangue mineral,albite has similar crystal chemical structure and composition to *** this work,the density functional theory(DFT)calculation was taken to research the floatability from the perspective of crystal *** contact angle test and reagent adsorption test were used to support the simulation *** addition,the weighted total density of broken bonds is proposed for the first time to judge the generation probability of cleavage *** DFT calculation results display that the Na and Al sites on the albite surface are the adsorption sites of water *** the water molecules only bond with Al atom on the surface of spodumene and each Al site can adsorb only one water ***,the wetting effect of water molecules on the albite surface is stronger than that of *** is consistent with the result of contact *** sodium oleate system,the oleic acid anion is adsorbed on the spodumene surface in form of a multicomponent ring while the albite is a single ***,oleic acid anion can be strongly adsorbed on the surface of spodumene and albite under *** adsorption strength of spodumene is higher than that of ***,on hydrated surface,the adsorption strength of oleic acid anion on mineral surface is greatly reduced due to the interaction between water molecules and metal site on mineral ***,spodumene and albite are hard to float without external activated ions in sodium oleate system.

关键词： Spodumene Albite Floatability Crystal chemistry DFT calculation

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Flotation separation of spodumene and albite with activation of calcium ion hydrolysate components

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Rare Metals 2022年第11期41卷 3919-3931页

作者： Xian-Ping Luo Yong-Bing Zhang He-Peng Zhou Fan-Xin Xie Zhi-Zhao Yang Bo-Yuan Zhang Cai-Gui Luo Engineering Research Center for High-Efficiency Development and Application Technology of Tungsten Resources(Jiangxi University of Science and Technology) Ministry of EducationGanzhou341000China Jiangxi Province Key Laboratory of Mining and Metallurgy Environmental Pollution Control Jiangxi University of Science and TechnologyGanzhou341000China

It is difficult to separate spodumene and albite by flotation with calcium ion as *** this study,microflotation experiment,solution chemistry calculation,density functional theory(DFT)calculation and X-ray photoelectron spectroscopy(XPS)analysis were conducted to investigate the effect mechanism of c alcium hydrolysate on the flotation separation of spodumene and *** show that the weak interaction intensity of Ca^(2+)with O atoms on the mineral surface makes it difficult to activate minerals *** O atom in the hydroxyl group of Ca(OH)^(+)and Ca(OH)_(2)can be strongly bonded with Al atom on the mineral surface,which greatly improves the adsorption *** the activation of Ca(OH)^(+),the adsorption forms of collectors on the surface of spodumene and albite are quite different,and the adsorption intensity on the surface of spodumene is higher,which is conducive to the flotation separation of spodumene and *** the action of Ca(OH)_(2),the adsorption of the collector on the albite surface is stronger than that of spodumene,which is not conducive to the flotation separation of the two *** adjusting the initial concentration of calcium ions and pulp pH,Ca(OH)^(+)is the main active component,which is the key to improve the separation effect of spodumene and albite.

关键词： Spodumene Albite Calcium ions Hydrolysate components Flotation Separation

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Weakly hydrophobic nanoconfinement by graphene aerogels greatly enhances the reactivity and ambient stability of reactivity of MIL-101-Fe in Fenton-like reaction

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Nano Research 2021年第7期14卷 2383-2389页

作者： Yuwei Zhang Fei Liu Zhichao Yang Jieshu Qian Bingcai Pan Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological EngineeringNanjing University of Science and TechnologyNanjing 210094China State Key Laboratory of Pollution Control and Resource Reuse School of the EnvironmentNanjing UniversityNanjing 210023China Research Center for Environmental Nanotechnology(ReCENT) Nanjing UniversityNanjing 210023China

In the pursuit of heterogeneous catalysts with high reactivity,metal organic framework(MOF)nanomaterials have received tremendous ***,many MOF catalysts especially Fe-based MOFs need to be utilized immediately after synthesis or being activated using high temperature,because of the easy loss of reactivity in humid environments resulting from the occupation of active Fe sites by water ***,we describe an inspiring strategy of growing MIL-101-Fe nanoparticles inside the three-dimensional confined space of graphene aerogel(GA),generating shapeable GA/MIL-101-Fe nanocomposite convenient for practical *** to MIL-101-Fe,GA/MIL-101-Fe as catalyst demonstrates much higher reactivity in Fenton-like reaction,attributing to smaller MIL-101-Fe particle size,presence of active Fe(II)sites,and abundant defects in ***,the weakly hydrophobic nature of the composite greatly inhibits the loss of catalytic reactivity after being stored in humid air and accelerates the recovery of reactivity in mild temperature,by resisting the entrance of water molecules and helping to exclude water *** work demonstrates that a delicate design of nanocomposite structure could not only improve the reactivity of the catalytic component,but also overcome its intrinsic drawback by taking advantage of the properties of *** hope this functional nanoconfinement strategy could be extended to more scenarios in other fields.

关键词： nanoconfinement hydrophobicity MIL-101-Fe graphene aerogel Fenton-like reaction

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Design of copper oxide and oxygen codoped graphitic carbon nitride activator for efficient radical and nonradical activation of peroxymonosulfate

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Chinese Chemical Letters 2023年第6期34卷 184-190页

作者： Lin Wei Jialing Li Chengyun Zhou Biao Song Fanzhi Qin Wenjun Wang Hanzhuo Luo Deyu Qin Cheng Huang Chen Zhang Yang Yang College of Environmental Science and Engineering Hunan University and Key Laboratory of Environmental Biology and Pollution ControlMinistry of Education(Hunan University)Changsha 410082China School of Design Hunan UniversityChangsha 410082China School of Resources and Environment Hunan University of Technology and BusinessChangsha 410205China Department of Chemical and Materials Engineering University of AlbertaEdmontonAlberta T6G 1H9Canada

Rational regulation of stable graphitic carbon nitride(CN)for superior peroxymonosulfate(PMS)activation is important in the catalytic degradation of water *** this work,the copper oxide and oxygen co-doped graphitic carbon nitride(Cu O/O-CN)was prepared via one-step synthesis and applied in activating PMS for oxytetracycline(OTC)degradation,displaying superior catalytic *** characterization and theoretical calculations indicated that the synergistic effect between the oxygen site of CN and CuO can modulate the electronic structure of the whole composite further facilitating the formation of non-radical^(1)O_(2)and various reactive *** of the influencing factor experiments revealed that CuO/O-CN has a strong resistance to the environmental *** degradation efficiency of OTC in the real water environment even exceeded that in the deionized *** four successive runs of the optimal catalyst,the OTC removal rate was still as high as 91.3%.This work developed a high-efficiency PMS activator to remove refractory pollutants via both radical pathway and non-radical pathway,which showed a promising potential in the treatment of wastewaters.

关键词： Graphitic carbon nitride Codoping Peroxymonosulfate Antibiotics Advanced oxidation process

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Construction of Electron-Deficient Co on the Nanotube Arrays Enhances Absorption and Direct Electron Transfer To Accelerate Electrochemical Nitrate Reduction

SSRN

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SSRN 2024年

作者： Gao, Zhifeng Duan, Xueying Yin, Xu Li, Wei Zhu, Hongwei Wei, Kajia Han, Weiqing Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Jiangsu Province Nanjing210094 China

Electrochemical nitrate reduction is a promising remediation strategy for nitrate-contaminated wastewater treatment, and the nitrate adsorption is a prerequisite step in the overall electrochemical process. Herein, the iron-induced cobalt phosphide nanotubes were grown in situ on porous nickel foam (Fe-CoP/NF) for the electrochemical nitrate reduction. Structural characterization verified doping of Fe and the uniform nanotube arrays of Fe0.03CoP/NF. Remarkably, the Fe0.03CoP/NF exhibited a high efficiency nitrate removal efficiency (99.3% within 120 min), 100% ammonia selectivity and excellent nitrogen selectivity (99.8% with anode oxidization). Both experimental and theoretical studies reveal that Fe doping alters the local charge distribution of the Co active centers to form electron-deficient Co. The construction of electron-deficient regions through differences in electronegativity between Co and Fe further enhances the adsorption of nitrate, thereby accelerating the whole electrochemical nitrate reduction process. Furthermore, the formation of electron-deficient centers facilitates the adsorption of nitrate and the reduction of charge transfer resistance. In particular, Fe0.03CoP/NF maintained an excellent conversion efficiency of nitrate to nitrogen (98.4%) with 60 mM Cl− during 10 consecutive cycles and a low electrical consumption of 1.79 kWh·molN-1. This study designed an electrocatalyst for enhancing the electrochemical nitrate reduction activity through enhanced nitrate absorption and H*-mediated and direct electron transfer dominated strategies, thus providing a promising and low-power consumption approach for addressing nitrate pollution. © 2024, The Authors. All rights reserved.

关键词： Nitrates

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Efficient Electrocatalytic Bromine Evolution and Extraction from Wastewater by Oxygen Vacancy Enriched Ti/Ov-Co3O4-NRs Electrode

SSRN

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SSRN 2024年

作者： Yin, Xu Li, Renping Li, Wei Gao, Zhifeng Wei, Kajia Zhu, Hongwei Gu, Liankai Jiang, Yun Han, Weiqing Key Laboratory of Chemical Pollution Control and Resources Reuse School of Environmental and Biological Engineering Nanjing University of Science and Technology Jiangsu Province Nanjing210094 China

Br−-containing wastewater has the risk of increasing Br− levels in receiving bodies if released into aquatic environments. Electrochemical oxidation is regarded as an ideal method for Br− removal and Br2 extraction because of its simple procedure and high efficiency. In this work, a novel oxygen vacancy enriched Ti/Ov-Co3O4-NRs electrode was fabricated and firstly used for Br− removal and Br2 extraction in Br−-containing wastewater. Characterization and experimental results showed that the Ti/Ov-Co3O4-NR electrode has more prominent bromine evolution reaction (BER) performance than do common electrodes (graphite, Ti/RiO2-Ir, Ti/PbO2, etc.). Notably, the construction of oxygen vacancies obviously accelerated the removal of Br− (53% improvement) by facilitating Br− adsorption and electron transfer. In addition, the effects of factors such as initial pH, initial Br− concentration, current density, coexisting ions and temperature on Br− removal were optimized. The Ti/Ov-Co3O4-NRs electrode also exhibited highly stable catalytic activity and conductivity. After 10 cycles, the removal rate of Br− decreased by 2.20%, and the Br2 production decreased by 3.6%. In actual applications, the unit energy consumption reached 1.59-1.76 kJ·g-1 Br, and the current efficiency remained above 70% throughout the whole treatment process. In addition, more than 80% of the TOC could be removed during Br2 extraction, which was more acceptable than the current reported experimental value of electrochemical Br2 extraction and exhibited great application prospects. © 2024, The Authors. All rights reserved.

关键词： Nanorods

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An application of hierarchical MgAl hydrotalcite in the highly efficient treatment of oilfield macromolecular contaminants

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Environmental Science and pollution Research 2024年第30期31卷 42792-42809页

作者： Yang, Chenye Liu, Qi Li, Tao Zhou, Rui Qu, Chengtun Tang, Ying Shaanxi Province Key Laboratory of Environmental Pollution Control and Reservoir Protection Technology of Oilfields Xi’an Shiyou University Xi’an China Shaanxi University Engineering Research Center of Oil and Gas Field Chemistry Xi’an Shiyou University Xi’an710065 China Xi’an Alberta Resources & amp Environment Analysis and Testing Technology Co. Ltd Xi’an710000 China

In this work, salicylic acid (SA) was used to induce the self-assembly of octadecyl trimethyl ammonium chloride (OTAC), a cationic surfactant, into three-dimensional wormlike micelle aggregates. These aggregates act as a soft template for hierarchical MgAl hydrotalcite (LDH) to create a multi-level pore structure adsorption material. Scanning electron microscopy characterization showed that the surface of the hierarchical hydrotalcite exhibited a dense layered structure, unlike the monolayer structure of ordinary hydrotalcite. Furthermore, the hierarchical MgAl-LDH possesses a significantly larger specific surface area (113.94 m2/g) and wide pore size distribution ranging more extensively from 2 to 80 nm, which significantly has an impressive adsorption effect on sulfonated lignite (SL), with a maximum adsorption capacity of 192.7 mg/g at pH = 7. Extensive research has been conducted on the adsorption mechanism of hierarchical MgAl-LDH, attributing it to surface adsorption due to the unique multi-level structure of the adsorbent. After two cycles of regeneration experiments, the adsorption capacity of the adsorbent remained at a high level of 179.1 mg/g, demonstrating the excellent renewability of hierarchical MgAl-LDH. Moreover, the hierarchical hydrotalcite showed high adsorption capacity in the adsorption of sulfonated lignite, which was attributed to its larger specific surface area and superior pore structure to expose more active sites. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Adsorption

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Electrophotocatalytic Reductive 1,2-Diarylation of Alkenes with Aryl Halides and Cyanoaromatics

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Chinese Journal of Chemistry 2023年第16期41卷 1921-1930页

作者： Liang Zeng Jing-Hao Qin Gui-Fen Lv Ming Hu Qing Sun Xuan-Hui Ouyang De-Liang He Jin-Heng Li State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan UniversityChangshaHunan 410082China Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle NanchangJiangxi 330063China State Key Laboratory Base of Eco-Chemical Engineering College of Chemical EngineeringQingdao University of Science and TechnologyQingdaoShandong 266042China State Key Laboratory of Applied Organic Chemistry Lanzhou UniversityLanzhouGansu 730000China School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiangHenan 453007China

Comprehensive Summary The radical-mediated reductive functionalization of aryl halides has been extensively ***,the related radical-mediated intermolecular reductive 1,2-diarylation of alkenes,using aryl halides as aryl radical sources,remains ***,a new electrophotocatalytic intermolecular reductive 1,2-diarylation of alkenes is reported using aryl halides and cyanoaromatics to produce polyarylated *** synergistic cathodic reduction and visible-light photoredox catalysis,various electron-rich and electron-deficient aryl halides are combined with various alkenes and cyanoaromatics to characterize the broad substrate scope,excellent functional group compatibility,and excellent selectivity of this *** investigations reveal that this reaction may proceed via a radical process initiated by the reductive generation of aryl radicals from aryl halides and terminated by radical-radical coupling with cyanoaromatic radical anions.

关键词： Alkenes Difunctionalization Organohalides Radical ions Electrophotocatalysis

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