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Synthesis of phosphate-embedded calcium alginate beads for Pb(Ⅱ) and Cd(Ⅱ) sorption and immobilization in aqueous solutions

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Transactions of Nonferrous Metals Society of China 2016年第8期26卷 2230-2237页

作者： yun-yan wang Wen-bin YAO Qing-wei wang Zhi-hui yanG Li-fen LIANG Li-yuan CHAI School of Metallurgy and Environment Central South University Changsha 410083 China Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution Central South University Changsha 410083 China

The phosphate-embedded calcium alginate beads were successfully synthesized based on sodium alginate, calcium dihydrogen phosphate and sodium hydrogen carbonate. Scanning electron microscopy, Fourier transformed infrared (FTIR) spectroscopy and X-ray diffraction (XRD) were conducted to characterize the morphology and structure of the phosphate-embedded calcium alginate beads. The effects of pH and the initial concentration of the metal ions on Pb(II) and Cd(II) sorption by the beads were investigated. The optimal pH values for Pb(II) and Cd(II) sorption are 4.0 and 5.5, respectively. The optimal initial concentrations of Pb(II) and Cd(II) are 200 mg/L and 25 mg/L, correspondingly, and the removal efficiencies are 94.2% and 80%,respectively. The sorption mechanism is that the heavy metal ions accessed the beads firstly due to the large surface area, combinedwith OH?, and then precipitated with phosphate radical, which was proven by FTIR and XRD. The sorption of Pb(II) and Cd(II) isfitted to Langmuir isotherm model with R2 values of 0.9957 and 0.988, respectively. The sorption capacities of Pb(II) and Cd(II) are263.16 mg/g and 82.64 mg/g, respectively. The results indicate that the phosphate-embedded calcium alginate beads could be appliedto treating Pb(II)/Cd(II)-containing wastewater and it could be implied that the synthesized beads also could be used as a kind of soil ameliorant for remediation of the heavy metal contaminated paddy soil.

关键词： adsorption immobilization lead cadmium phosphate-embedded calcium alginate beads

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Adsorption of copper ions on porous ceramsite prepared by diatomite and tungsten residue

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Transactions of Nonferrous Metals Society of China 2018年第5期28卷 1053-1060页

作者： Qing-xiu JING yun-yan wang Li-yuan CHAI Chong-jian TANG Xiao-dong HUANG Huan GUO Wei wang Wei YOU School of Metallurgy and Environment Central South University Changsha 410083 China School of Metallurgical and Chemical Engineering Jiangxi University of Science and Technology Ganzhou 341000 China

In order to realize resource utilization of industrial tungsten residue and treatment of heavy metal wastewater in mining and metallurgical area of south China,a novel ceramsite was prepared with the main raw materials of diatomite and tungsten *** adsorption behavior of copper ions in solution on the ceramsite was *** indicated that the surface of the newly-developed ceramsite was rough and *** were lots of pores across the ceramsite from inner to ***2O4 was one of the main components of the *** Cu^2＋adsorption capacity by the ceramsite reached 9.421 mg/g with copper removal efficiency of 94.21%at 303 K,initial Cu^2＋concentration of 100 mg/L and dosage of 0.5 g after 300 min *** increase of ceramsite dosage,the total adsorption amount of Cu^2＋increased,but the adsorption capacity *** adsorption capacity increased with the increase of solution p *** isothermal adsorption of Cu^2＋by the ceramsite fitted the Freundlich model *** adsorption mainly occurred on a heterogeneous surface,and was a favorable *** adsorption process closely followed the pseudo-second kinetic *** initial stage of wastewater treatment,the adsorption process should be controlled mainly by diffusion,and the removal of Cu^2＋can be improved by enhancing agitation.

关键词： tungsten residue ceramsite heavy metal wastewater Cu^2+ adsorption

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Maintaining moderate levels of hypochlorous acid promotes neural stem cell proliferation and differentiation in the recovery phase of stroke

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Neural Regeneration Research 2025年第3期20卷 845-857页

作者： Lin-yan Huang Yi-De Zhang Jie Chen Hai-Di Fan Wan wang Bin wang Ju-yun Ma Peng-Peng Li Hai-Wei Pu Xin-Yian Guo Jian-Gang Shen Su-Hua Qi School of Medical Technology Xuzhou Key Laboratory of Laboratory DiagnosticsXuzhou Medical UniversityXuzhouJiangsu ProvinceChina School of Pharmacy Xuzhou Medical UniversityXuzhouJiangsu ProvinceChina Department of Laboratory Medicine Branch Hospital of Huai’an First People’s HospitalHuai’anJiangsu ProvinceChina Department of Laboratory Medicine the Affiliated Hospital of Xuzhou Medical UniversityXuzhouJiangsu ProvinceChina School of Chinese Medicine The University of Hong KongHong Kong Special Administrative RegionChina

It has been shown clinically that continuous removal of ischemia/reperfusion-induced reactive oxygen species is not conducive to the recovery of late ***,previous studies have shown that excessive increases in hypochlorous acid after stroke can cause severe damage to brain *** previous studies have found that a small amount of hypochlorous acid still exists in the later stage of stroke,but its specific role and mechanism are currently *** simulate stroke in vivo,a middle cerebral artery occlusion rat model was established,with an oxygen-glucose deprivation/reoxygenation model established in vitro to mimic *** found that in the early stage(within 24 hours)of ischemic stroke,neutrophils produced a large amount of hypochlorous acid,while in the recovery phase(10 days after stroke),microglia were activated and produced a small amount of hypochlorous ***,in acute stroke in rats,hypochlorous acid production was prevented using a hypochlorous acid scavenger,taurine,or myeloperoxidase inhibitor,4-aminobenzoic acid *** results showed that high levels of hypochlorous acid(200μM)induced neuronal apoptosis after oxygen/glucose deprivation/***,in the recovery phase of the middle cerebral artery occlusion model,a moderate level of hypochlorous acid promoted the proliferation and differentiation of neural stem cells into neurons and *** suggests that hypochlorous acid plays different roles at different phases of cerebral ischemia/reperfusion *** levels of hypochlorous acid(5 and 100μM)promoted nuclear translocation ofβ-*** transfection of single-site mutation plasmids,we found that hypochlorous acid induced chlorination of theβ-catenin tyrosine 30 residue,which promoted nuclear ***,our study indicates that maintaining low levels of hypochlorous acid plays a key role in the recovery of neurological function.

关键词： cell differentiation cerebral ischemia/reperfusion injury chlorination hypochlorous acid microglia neural stem cell neurogenesis nuclear translocation stroke β-catenin

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Mechanism of lime decomposing Al_(2)O_(3)-containing fayalite melt

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Transactions of Nonferrous Metals Society of China 2024年第11期34卷 3707-3720页

作者： Hui-chuan REN Xiao-bo MIN Yong KE Long-gong XIA yun-yan wang Cong PENG yun LI Rong-he TAN Chuan-fu ZHANG School of Metallurgy and Environment Central South UniversityChangsha 410083China State Key Laboratory of Advanced Metallurgy for Non-ferrous Metals Changsha 410083China Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution Changsha 410083China CINF Engineering Corporation Limited Changsha 410001China

A method to upgrade the iron grade in copper slag was proposed using lime to decompose Al_(2)O_(3)-containing fayalite melt(AFMT).Thermodynamic calculations indicated that adjusting the CaO/AFMT ratio can yield a residual melt with a FeO concentration of 75−88 wt.%and produce Ca_(2)SiO_(4).In-situ observations suggested that the reaction was impeded in some *** experiments revealed that the initial reaction products consisted of calcium ferrite compounds and FeO−CaO *** the FeO−CaO melt/AFMT interface,Ca_(2)SiO_(4) particles precipitated,forming a dense Ca_(2)SiO_(4) film that significantly impeded mass *** trace amounts of Al_(2)O_(3) in AFMT temporarily enhanced mass transfer,they were insufficient to overcome this retardation *** decomposition reaction was far from achieving equilibrium,demonstrating a self-retardation *** must be implemented to eliminate this self-retardation effect and enhance the efficiency of reaction kinetics.

关键词： lime Al_(2)O_(3)-containing fayalite melt Ca_(2)SiO_(4)film self-retardation mass transfer

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Electro-enhanced adsorption of As(V)by activated carbon in three-dimensional electrode reactor

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Transactions of Nonferrous Metals Society of China 2022年第6期32卷 2080-2090页

作者： Yong-jian LUO yun-yan wang Hui XU Jia-li DU Ming-fei ZHU Li-min ZHANG Zhu-mei SUN School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution Central South UniversityChangsha 410083China School of Environment and Safety Engineering North University of ChinaTaiyuan 030051China

This study focused on As(V)removal by electrosorption in a self-made three-dimensional electrode reactor,in which granular activated carbon(GAC)was used as the particle *** the optimal conditions,the removal efficiency of As(V)was 84%,and its residual concentration in solution was 0.08 mg/*** kinetic investigation,the rate determining steps of the entire process may involve more than two processes:membrane diffusion,material diffusion and physical/chemical adsorption *** the desorption process,As(V)can be desorbed from GAC,and the GAC was able to electro-adsorb As(V)again after desorption,which means that the electrode has good cycling performance.

关键词： arsenic removal activated carbon electrosorption three-dimensional electrode reactor

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Physicochemical and environmental properties of arsenic sulfide sludge from copper and lead-zinc smelter

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Transactions of Nonferrous Metals Society of China 2020年第7期30卷 1943-1955页

作者： Li-wei YAO Xiao-bo MIN Hui XU Yong KE yun-yan wang Zhang LIN yan-jie LIANG De-gang LIU Qiu-jing XU Yu-yang HE School of Metallurgy and Environment Central South UniversityChangsha 410083China Chinese National Engineering Research Center for Control&Treatment of Heavy Metal Pollution Central South UniversityChangsha 410083China

Physicochemical properties of arsenic sulfide sludge(ASS) from copper smelter(ASS-I) and lead-zinc smelter(ASS-II) were examined by XRD, Raman spectroscopy, SEM-EDS, TG-DTA, XPS and chemical phase analysis method. The toxicity characteristic leaching procedure(TCLP), Chinese standard leaching tests(CSLT), three-stage sequential extraction procedure(BCR) and batch leaching experiments(BLE) were used to investigate the environmental stability. The ASSs from different smelters had obviously different physicochemical and environmental properties. The phase composition and micrograph analysis indicate that ASS-I mainly consists of super refined flocculent particles including amorphous arsenic sulfide adhered with amorphous sulfur and that ASS-II mainly consists of amorphous arsenic sulfide. The valence state of arsenic in both sludges is trivalent, but the valence composition of sulfur is quite different. The ASSs have thermal instability properties. The results of TCLP and CSLT indicate that the concentrations of As and Pd in the leaching solution exceed the standard limits. More than 5% and 90% of arsenic are in the form of acid soluble and oxidizable fractions, respectively, which explains the high arsenic leaching toxicity and environmental activity of ASS. This research provides comprehensive information for the disposal of ASS from copper and lead-zinc smelter.

关键词： arsenic sulfide sludge heavy metals physicochemical properties environmental availability leaching toxicity

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基于NGA的可见光通信接收系统分析

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光通信研究 2016年第4期4期(23)卷 72-74,77页

作者：张云艳王辉南京工业大学计算机科学与技术学院南京211816

在室内可见光通信MIMO(多输入多输出)系统中,针对用户无法公平享用通信服务的问题,提出了一种寻找光接收机中最优聚光器增益来优化多用户情况下功率分配不均匀的方法。利用改进的NGA(小生境遗传算法)建立与接收光功率相对应的节点模型,... 详细信息

在室内可见光通信MIMO(多输入多输出)系统中,针对用户无法公平享用通信服务的问题,提出了一种寻找光接收机中最优聚光器增益来优化多用户情况下功率分配不均匀的方法。利用改进的NGA(小生境遗传算法)建立与接收光功率相对应的节点模型,通过运算寻找一组最优的聚光器增益组合运用到光接收系统中。仿真结果表明,改进的NGA能高效地找出一组最优聚光器增益组合,从而改善用户接收光功率分配不均匀的现象。

关键词：可见光通信聚光器增益小生境遗传算法

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气相色谱-质谱法同时测定绿茶中28种农药残留

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食品研究与开发 2017年第1期38卷 152-157页

作者：胡强王延云王燕李超豪竹类病虫防控与资源开发四川省重点实验室四川乐山614000 乐山师范学院生命科学学院四川乐山614000 乐山市产品质量监督检验所四川乐山614000

建立绿茶中28种农药残留同时测定的气相色谱-质谱分析方法。绿茶样品采用乙腈超声提取,经Cleanert TPT(2 g/12 m L)复合固相萃取小柱净化,气相色谱-质谱分析,内标法定量。方法的添加回收试验表明:在0.05、0.15 mg/kg两个添加水平,28种... 详细信息

建立绿茶中28种农药残留同时测定的气相色谱-质谱分析方法。绿茶样品采用乙腈超声提取,经Cleanert TPT(2 g/12 m L)复合固相萃取小柱净化,气相色谱-质谱分析,内标法定量。方法的添加回收试验表明:在0.05、0.15 mg/kg两个添加水平,28种农药的平均回收率为82.5%~106.7%,相对标准偏差为2.6%~7.1%;方法的检出限为0.005 mg/kg^0.040 mg/kg。该方法样品前处理简单,适合批量前处理,准确度、精密度和灵敏度均符合农药多残留检测的技术要求。

关键词：绿茶气相色谱-质谱法(GC-MS) 农药残留内标法固相萃取

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房地产投资信托与房地产私募股权基金的辨析与应用初探

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特区经济 2011年第12期 274-276页

作者：花蕴汪红艳王烨哈尔滨工业大学深圳研究生院城市规划与管理学院广东深圳518000 花样年集团(中国)有限公司

近年来房地产面临更加严峻的信贷政策,传统融资渠道受限。房地产投资信托(REITs)及房地产私募股权基金(REPE)成为关注的新型融资渠道。本文详细辨析了REITs与REPE的概念,探讨了REITs与REPE在国内应用的可行性,分析其在国内应用存在的障... 详细信息

近年来房地产面临更加严峻的信贷政策,传统融资渠道受限。房地产投资信托(REITs)及房地产私募股权基金(REPE)成为关注的新型融资渠道。本文详细辨析了REITs与REPE的概念,探讨了REITs与REPE在国内应用的可行性,分析其在国内应用存在的障碍并提出建议。

关键词：房地产投资信托私募股权 REITs

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Regeneration of activated carbon adsorbed EDTA by electrochemical method

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Transactions of Nonferrous Metals Society of China 2013年第3期23卷 855-860页

作者：尤翔宇柴立元王云燕苏艳蓉赵娜舒余德中南大学冶金科学与工程学院长沙410083 国家重金属污染防治工程技术研究中心长沙410083 湖南省环境保护科学研究院长沙410004 中机国际工程设计研究院有限责任公司长沙410007 长沙有色冶金设计研究院长沙410011

Activated carbon after saturated adsorption of EDTA was used as particle electrode in a three-dimensional electrode reactor to treat EDTA-containing *** method was used to regenerate activated carbon after many times of *** on the analysis of infrared spectra of activated carbon after adsorption and repeated electrolysis,EDTA was degraded into glycine,and then non-catalytic activated associated complex was formed with N—H bond on the activated *** catalytic ability of the activated carbon vanished and the EDTA degradation efficiency was *** carbon could be effectively regenerated by electrochemical method in the three-dimensional *** of electric current,conductivity and pH on activated carbon regeneration were investigated,and the optimum conditions were concluded as follows：100-300 mA of current intensity,1.39 mS/cm of electric conductivity,60 min of electrolysis time and pH *** the optimized conditions,the activity of the activated carbon can be recovered and the residual total organic carbon（TOC） was below 10 mg/L（the initial TOC was 200 mg/L） in the three-dimensional electrode reactor.

关键词： activated carbon electrochemical regeneration three-dimensional electrode EDTA

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