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Nitrate wastewater was considered a potential threat to human health and the ecological environment. The adsorption method was regarded as promising for nitrate removal due to its high efficiency and low cost. The interlayer spacing characteristics of layered metal hydroxides were found to be favorable for nitrate adsorption. Nickel-iron layered double hydroxides (NiFe LDHs) was prepared by coprecipitation-hydrothermal method. The optimal preparation conditions were determined through orthogonal experiments as follows: nickel-to-iron molar ratio of 4:1, hydrothermal time of 12hours, and hydrothermal temperature of 1201C. The adsorption capacity of NiFe LDHs for nitrate can reach 37.48mg/g. The adsorption kinetics curve conforms to the quasi second order kinetic equation, and the adsorption process conforms to the Langmuir model. The predicted maximum adsorption capacity is 38.88mg/g. High nitrate adsorption efficiency was maintained by NiFe LDHs within the pH range of 3~10, and a considerable nitrate adsorption capacity was observed even in the presence of high concentrations of coexisting anions, with HCO₃^- identified as having the most significant impact. The optimal desorption of the adsorbent was achieved using 0.1mol/L NaCl solution, and after five consecutive adsorption-desorption cycles, a nitrate removal rate of 87.1% was retained. Characterization results indicated that the layered structure of NiFe LDHs was essentially maintained before and after adsorption, and the primary adsorption mechanisms were determined to be electrostatic attraction, surface complexation, and ion exchange.

, authors=Lu QI¹, Si-zhe CHEN¹, Su-ying DING¹, Yang QIN¹, Xiao-jun WANG², Yu-qian SHI², Guang-wei ZHOU², Guo-hua LIU^{1, *}, authorsList=Lu QI, Si-zhe CHEN, Su-ying DING, Yang QIN, Xiao-jun WANG, Yu-qian SHI, Guang-wei ZHOU, Guo-hua LIU, authorCompany=null, correspAuthors=Guo-hua LIU, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1314918419284190196, articleId=1314918418827011058, tenantId=1146029695717560320, journalId=1234093305789726721, language=CN, title=NiFe LDHs的制备及其吸附去除废水中硝酸盐的性能和机理分析, columnId=1234106386565624579, journalTitle=中国环境科学, columnName=水污染与控制, runingTitle=null, highlight=null, articleAbstract=

硝酸盐废水对人类及生态环境造成潜在威胁,吸附法因高效率、低成本在硝酸盐去除领域具有良好的应用前景.而层状金属氢氧化物的层间距特性,有利于对硝酸盐的吸附.采用共沉淀-水热法制备了镍铁层状双金属氢氧化物（NiFe LDHs）,通过正交试验确定材料最佳制备条件为镍铁摩尔比为4:1,水热时间为12h,水热温度为120℃.NiFe LDHs对于硝酸盐的吸附量能够达到37.48mg/g.吸附动力学曲线符合准二级动力学方程,且吸附过程符合Langmuir模型,预测的最大吸附容量为38.88mg/g.NiFe LDHs在pH值3~10时保持良好的硝酸盐吸附效率,高浓度阴离子共存条件下仍然有较高的硝酸盐吸附容量,其中HCO₃^-对硝酸盐的吸附影响最大.使用0.1mol/L的NaCl溶液进行吸附剂的解吸最佳,5次循环吸附实验后能保持87.1%的硝酸盐去除率.表征结果表明,在吸附前后NiFe LDHs基本层状双金属氢氧化物结构保持不变,吸附机理主要为静电引力、表面络合与离子交换.

, authors=齐鲁¹, 陈思哲¹, 丁素莹¹, 秦杨¹, 王小军², 史玉乾², 周光伟², 刘国华^{1, *}, authorsList=齐鲁, 陈思哲, 丁素莹, 秦杨, 王小军, 史玉乾, 周光伟, 刘国华, authorCompany=null, correspAuthors=刘国华, authorNote=, correspAuthorsNote=, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=L+SPQIaq1/n+CUxO2gAnhQ==, magXml=nfHlavs0Y2o0Q9VchuttHg==, pdfUrl=null, pdf=wV5mm07qPx1hKZzq6l2nbg==, pdfFileSize=2787331, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=rfHVy2pa0QCiplCP0c05VQ==, mapNumber=null, fund=null)}, authors=[Author(id=1314918419741369340, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1314918418827011058, orderNo=0, firstName=null, middleName=null, lastName=null, nameCn=null, orcid=null, stid=null, country=null, authorPic=null, dead=0, email=qilu@ruc.edu.cn, emailSecond=null, emailThird=null, correspondingAuthor=0, authorType=1, ext={EN=AuthorExt(id=1314918419825255422, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1314918418827011058, authorId=1314918419741369340, language=EN, stringName=Lu QI, firstName=Lu, middleName=null, lastName=QI, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=¹, address=^1.Research Center for Low Carbon Technology of Water Environment, School of Chemistry and Life Resources, Renmin University of China, Beijing 100872, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1314918421490394111, tenantId=1146029695717560320, journalId=1234093305789726721, articleId=1314918418827011058, authorId=1314918419741369340, language=CN, stringName=齐鲁, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=¹, address=^1.中国人民大学化学与生命资源学院，低碳水环境技术研究中心，北京 100872, bio={"content":"

齐鲁（1982-），男，山东滨州人，副教授，博士，研究方向为水污染治理理论.发表论文30余篇．qilu@ruc.edu.cn.

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齐鲁（1982-），男，山东滨州人，副教授，博士，研究方向为水污染治理理论.发表论文30余篇．qilu@ruc.edu.cn.

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