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Organic ligand-induced dissolution kinetics of antimony trioxide

Journal of Environmental Sciences 2017年第6期29卷 87-94页

作者： Xingyun Hu mengchang he State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal University State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesUniversity of Chinese Academy of Sciences

The influence of low-molecular-weight dissolved organic matter （LMWDOM） on the dissolution rate of Sb203 was investigated. Some representative LMWDOMs with carboxyl, hydroxyl, hydrosulfuryl and amidogen groups occurring naturally in the solution were chosen, namely oxalic acid, citric acid, tartaric acid, EDTA, salicylic acid, phthalandione, glycine, thiolactic acid, xylitol, glucose and catechol. These LMWDOMs were dissolved in inert buffers at pH = 3.7, 6.6 and 8.6 and added to powdered Sb203 in a stirred, thermostatted reactor （25℃）. The addition of EDTA, tartaric acid, thiolactic acid, citric acid and oxalic acid solutions at pH 3.7 and catechol at pH 8.6 increased the rate of release of antimony. In the 10 mmol/L thiolactic acid solution, up to 97% by mass of the antimony was released after 120 rain reaction. There was no effect on the dissolution of Sb203 for the other ligands. A weak correlation between dissolution rate with the dissociation constant of ligands and the stability of the dissolved complex was also found. All the results showed that the extent of the promoting effect of ligands on the dissolution of Sb203 was not determined by the stability of the dissolved complex, but by the dissociation constant ofligands and detachment rate of surface chelates from the mineral surface. This study can not only help in further understanding the effect of individual low-molecular-weight organic ligands, but also provides a reference to deduce the effect of natural organic matters with oxygen-bearing functional groups on the dissolution of antimony oxide minerals.

关键词： Antimony pollutionAntimony trioxideDissolutionOrganic ligands

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Efect of dissolved organic matter on sorption and desorption of phenanthrene onto black carbon

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Journal of Environmental Sciences 2013年第12期25卷 2378-2383页

作者： Jinghuan Zhang mengchang he State Key Joint Laboratory of Environment Simulation and Pollution Control Beijing Normal University School of Environment Beijing Normal University College of Environment and Safety Engineering Qingdao University of Science and Technology

Sorption and desorption of phenanthrene （Phe） onto black carbon （BC） extracted from sediments were studied in the presence of three types of dissolved organic matter （DOM）, including L-phenylalanine （L-PH）, peptone and citric acid. The nonlinearity of the sorption isotherms increased in the presence of DOM. The presence of L-PH reduced the sorption capacity and desorption hysteresis because of the solubilization of Phe in L-PH solution. Peptone at 50-500 mg/L also led to a decrease in sorption attributed to solubilization, although the sorbed peptone on the BC surface could slightly increase Phe sorption. Unlike L-PH and peptone, citric acid enhanced the sorption capacity and irreversibility of Phe on BC mainly due to the strong sorption of citric acid on the BC surface. Our results may help to understand the different impacts of DOM on the distribution and transport of PAH in the environment.

关键词： DOM black carbon phenanthrene sorption desorption

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Effects of temperature and surfactants on naphthalene and phenanthrene sorption by soil

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Journal of Environmental Sciences 2009年第5期21卷 667-674页

作者： ZHANG Jinghuan ZENG Jianhui he mengchang State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing 100875 China Faculty of Natural Resource & Information Technology China University of Petroleum Beijing 102200 China

Adsorption experiments were carried out to investigate the sorption behaviors of naphthalene and phenanthrene in six different soils and to determine the effects of temperature, linear alkylbenzene sulfonate （LAS） and cetylrimethyl ammonium bromide （CTAB） on sorption. The results show that for a given sorbent phenanthrene exhibited greater nonlinear and stronger sorption than naphthalene. There was a strong negative correlation for the Koc values with organic carbon content （foc）. The increase of temperature was not favorable to sorption. Sorption decreased along with the increasing aqueous LAS concentration from 0 to 1000 mg/L. At low CTAB concentration （〈 100 mg/L）, the adsorption increased as CTAB hemimicelles formed on the soil surface. At high concentration, CTAB decreased the adsorption by occupying active hydrophobic adsorption sites and solubilization of naphthalene and phenanthrene.

关键词： naphthalene phenanthrene sorption soil temperature linear alkylbenzene sulfonate cetylrimethyl ammonium bromide

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Antimony leaching release from brake pads: Effect of pH,temperature and organic acids

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Journal of Environmental Sciences 2015年第3期27卷 11-17页

作者： Xingyun Hu mengchang he Sisi Li State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University

Metals from automotive brake pads pollute water, soils and the ambient air. The environmental effect on water of antimony （Sb） contained in brake pads has been largely untested, The content of Sb in one abandoned brake pad reached up to 1.62 × 10^4 mg/kg. Effects of initial pH, temperature and four organic acids （acetic acid, oxalic acid, citric acid and humic acid） on Sb release from brake pads were studied using batch reactors. Approximately 30% （97 mg/L） of the total Sb contained in the brake pads was released in alkaline aqueous solution and at higher temperature after 30 days of leaching. The organic acids tested restrained Sb release, especially acetic acid and oxalic acid. The pH-dependent concentration change of Sb in aqueous solution was best fitted by a logarithmic function. In addition, Sb contained in topsoil from land where brake pads were discarded （average 9 × 10^3 mg/kg） was 3000 times that in uncontaminated soils （2.7 ± 1 mg/kg） in the same areas. Because potentially high amounts of Sb may be released from brake pads, it is important that producers and environmental authorities take precautions.

关键词： Antimony Brake padLeaching Environmental risks

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Characterization of humic acids extracted from the sediments of the various rivers and lakes in China

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Journal of Environmental Sciences 2008年第11期20卷 1294-1299页

作者： he mengchang SHI Yehong LIN Chunye State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing 100875 China

The humic acids (HAs) isolated from the sediments of the various rivers,lakes,and reservoirs in China were studied using elemental analyzer,fourier transform infrared (FT-IR),and CP/MAS 13C nuclear magnetic resonance (NMR) *** results showed that the HAs were characterized by some common chemical and physicochemical properties,but they also pose some differences in the C-containing functional *** C/N,C/H,O/C,and O/H ratios differ widely for the various HAs,showing that the elemental comp...

关键词： CP/MAS 13C NMR spectroscopy elemental analysis fourier transform infrared spectroscopy humic acids surficial sediment structural characteristics

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A review of removal technology for antimony in aqueous solution

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Journal of Environmental Sciences 2020年第4期32卷 189-204页

作者： Xiaojing Long Xin Wang Xuejun Guo mengchang he State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal UniversityBeijing 100875China

Antimony(Sb)and its compounds,toxic metalloid,have been classified as high-priority *** Sb released into the water environment by natural processes and anthropogenic activities,which exposure threatens to human health and ***,it is of unquestionable importance to remove Sb from polluted *** in view the extreme importance of this issue,we summarize the source,chemistry,speciation,distribution,toxicity,and polluted situation of Sb about aqueous ***,we provide the recent and common technology to remove Sb,which are based on adsorption,coagulation/flocculation,electrochemical technology,membrane technology,ion exchange,*** this review,we focus in detail on the adsorption method,researchers at present have been investigating to discover more advanced,cost-effective,eco-friendly,reusable ***,to date the Sb-containing wastewater treatment technologies are not sufficiently developed and most of research have been tested only in controlled lab *** reports are available that include field studies and *** critically analyzed the salient features and removal mechanisms,evaluating benefits and limitations of these technologies,hoping to provide more references for further ***,we considered the Fe-or Mn-based technologies was the most promising technique to remove Sb for field application.

关键词： Antimony pollution Removal technology Adsorption Coagulation-flocculation Membrane technology Ion exchange

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pH-dependent release characteristics of antimony and arsenic from typical antimony-bearing ores

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Journal of Environmental Sciences 2016年第6期28卷 171-179页

作者： Xingyun Hu Xuejun Guo mengchang he Sisi Li State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University

The pH-dependent leaching of antimony（Sb） and arsenic（As） from three typical Sb-bearing ores（Banxi, Muli and Tongkeng Antimony Mine） in China was assessed using a pH-static leaching experiment. The pH changes of the leached solutions and pH-dependent leaching of Sb and As occurred in different ways. For the Banxi and Muli Sb ores, alkaline conditions were more favorable for the release of Sb compared to neutral and acidic conditions, but the reverse was true for the pH-dependent release of As. For the Tongkeng Sb ore, unlike the previous two Sb-bearing ores, acidic conditions were more favorable for Sb release than neutral and alkaline *** ores with lower Sb and As contents released higher percentages of their Sb and As after 16 day leaching, suggesting that they are the largest potential sources of pollution. This work may provide key information on the geochemistry of Sb and As in the weathering zone.

关键词： Typical antimony ores pH-static leaching Antimony Arsenic

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Comparison of masking agents for antimony speciation analysis using hydride generation atomic fluorescence spectrometry

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Frontiers of Environmental Science & Engineering 2015年第6期9卷 970-978页

作者： Jianhong XI mengchang he Kunpeng WANG Guizhi ZHANG School of Chemistry and Environmental Engineering Shanxi Datong University Datong 037009 China State Key Laboratory of Water Environment Simulation School of Environment Beijing Normal University Beijing 100875 China

A sensitive atomic spectrometric method for the redox speciation analysis of Sb in water is described. The proposed method is based on the selective generation of stibine from Sb（III） in a continuous flow system using non-dispersive atomic fluorescence spectrometry for detection. The effects of the HCI concentration on the fluorescence intensities of Sb（III） and Sb（V） were investigated. The results indicated that atomic fluorescence emission due to Sb（V） can constructively interfere with the determination of Sb（III）. For the determination of Sb（III）, four compounds were tested as masking agents to inhibit the generation of stibine from Sb（V）. The effects of the concentrations of the masking agents and of HC1 on the fluorescence signals from Sb（III） and Sb（V） were studied. The results indicated that citric acid and NaF can successfully suppress hydride generation from Sb（V）. To evaluate the developed methodology and the influence of the matrix, the recovery of Sb（III） from natural water that was spiked with different Sb（III） and Sb（V） concentrations was tested.

关键词： Sb(III) Sb(V) determination maskingagents hydride generation (HG-AFS)

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Insight into removal of dissolved organic matter in post pharmaceutical wastewater by coagulation-UV/H_2O_2

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Journal of Environmental Sciences 2019年第2期31卷 329-338页

作者： Feng Qian mengchang he Jieyun Wu Huibing Yu Liang Duan State Key Laboratory of Water Environment Simulation School of EnvironmentBeijing Normal University State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences

The removal of four dissolved organic matter(DOM) fractions, non-acid hydrophobics,hydrophobic acids, hydrophilics and transphilics, was achieved by coagulation-UV/H_2O_2 oxidation in post-pharmaceutical wastewater(PhW W). Coagulation with Polyferric chloride(PFC), Polymeric ferric sulfate(PFS) and Polymeric aluminum ferric chloride(PAFC) was studied separately to evaluate the effects of the initial pH and coagulant dosage. The coagulation-UV/H_2O_2 oxidation method resulted in much higher reduction rates for dissolved organic carbon(DOC)(by 75%) and UV_(254)(by 92%) than coagulation or UV/H_2O_2 oxidation alone. The proportion of non-acid hydrophobics, hydrophobic acids, transphilics and hydrophilics removed by coagulation was 54%, 49%, 27% and 12 %, while the combined treatment removed 92%, 87%,70% and 39%, respectively. Parallel factor analysis(PARAFAC) of fluorescence measurements revealed that the humic-like fluorescent component C4 showed the highest removal(by 44%)during the coagulation stage. After coagulation-UV/H_2O_2 treatment, the humic-like fluorescent component C3 had the highest removal(by 72%), whereas xenobiotic organic fluorescent components C1 and C4 remained recalcitrant to decomposition. Significant correlations(R2> 0.8)between C1 and the hydrophobic acids and non-acid hydrophobics suggested the possibility of using fluorescence spectroscopy as an effective tool to assess variations in DOM fraction treatment efficacy in coagulation-UV/H_2O_2 systems. After the combined treatment, toxic inhibition of cellular activity by post PhW W decreased from 88% to 47% and biodegradability increased from 0.1 to 0.52.

关键词： Post PhWW Coagulation UV/H2O2 PARAFAC DOM fractionation Toxicity

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Antimony smelting process generating solid wastes and dust:Characterization and leaching behaviors

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Journal of Environmental Sciences 2014年第7期26卷 1549-1556页

作者： Xuejun Guo Kunpeng Wang mengchang he Ziwei Liu Hailin Yang Sisi Li State Key Laboratory of Environment Simulation School of Environment Beijing Normal University

A large amount of solid waste has been produced by the antimony smelting process in the＂World Capital of Antimony＂, Xikuangshan area in China. This study comprehensively investigated the physical and chemical characteristics of the various solid wastes, as well as the leaching behavior of the solid wastes, which included water-quenched slag,arsenic-alkali residue, desulfurized slag and blast furnace dust. These four types of waste were enriched in a variety of heavy metals and metalloids and more specifically with As and Sb levels up to 8.6 × 104 and 3.16 × 105mg/kg, respectively, in arsenic-alkali residue. For desulfurized slag and water-quenched slag, the leaching concentration of Sb significantly exceeded the acceptable limits during the leaching tests using the toxicity characteristic leaching procedure and the synthetic precipitation leaching procedure. In addition, As leaching in arsenic-alkali residue was extraordinarily hazardous, being three orders of magnitude higher than the regulatory level of As. According to the results of the extraction tests, all the tested wastes were classified as hazardous waste.

关键词： Antimony smelter slag Arsenic BCR sequential extraction TCLP SPLP

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