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镁铝层状双（氢）氧化物对亚铁氰离子的吸附性能研究
- 作者：
- 王晓歌|吴冰|李斌川|刘亚芳|陈建设|孟伟粉|韩庆
- 作者单位：
- 东北大学冶金学院|三门峡职业技术学院|东北大学冶金学院|三门峡市有色金属技术发展中心|东北大学冶金学院|三门峡市有色金属技术发展中心|东北大学冶金学院
基金项目：
- 三门峡市2022年科技攻关项目（2022002001）
详细信息：
- 作者简介：
- 王晓歌(1996—)，女，博士研究生，研究方向为含氰废水资源化处置；E-mail：wxg18437955208@163.com
- 通讯作者：
- 韩庆(1975—)，男，教授，研究方向为冶金环保；E-mail：hanq@smm.neu.edu.cn
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Study on the adsorption performance of MgAl layered double(hydro)oxides for ferrocyanide ions
- English Author：
- School of Metallurgy,Northeastern University|Sanmenxia Polytechnic|School of Metallurgy,Northeastern University|Sanmenxia Nonferrous Metals Technology Development Center|School of Metallurgy,Northeastern University|Sanmenxia Nonferrous Metals Technology Development Center|School of Metallurgy,Northeastern University
- Unit：
- 摘要
- 在线预览
- 参考文献
摘要:
研究采用镁铝层状双（氢）氧化物（MgAl-LDH）及其焙烧产物（MgAl-LDO）去除水溶液中的亚铁氰离子（[Fe(CN)6]4-）。采用共沉淀法制备了不同CO2-3、Cl-插层浓度的MgAl-LDH，并通过焙烧法制备了不同的MgAl-LDO。探究了LDH及LDO对[Fe(CN)6]4-的吸附性能。结果表明:LDH具有较快的吸附速率，可在20 min内实现吸附平衡；LDO具有较高的吸附容量，最高为234.4 mg/g；在pH值为7~12时，吸附剂对[Fe(CN)6]4-均有较好的吸附效果；在含有高浓度SO2-4及SCN-溶液中，吸附剂能实现[Fe(CN)6]4-的选择性吸附。对反应机理的分析表明：在LDH的插层阴离子中，只有Cl-能与[Fe(CN)6]4-发生离子交换产生吸附效果，并生成Al[FeMg(CN)6]；LDO对[Fe(CN)6]4-的吸附作用源于其“记忆效应”，LDH层间CO2-3占比越高，相应LDO的吸附容量越大。
关键词:
镁铝层状双（氢）氧化物；插层阴离子；亚铁氰离子；选择性；吸附机理；废水处理
Abstract:
This study investigates the removal of ferrocyanide ions ([Fe(CN)6]4-) from aqueous solutions using MgAl layered double (hydro)oxides(MgAl-LDH) and their roasting products (MgAl-LDO).MgAl-LDH with different concentrations of CO2-3 and Cl- intercalates were synthesized by co-precipitation, and various MgAl-LDO were prepared by roasting. The adsorption performance of LDH and LDO for [Fe(CN)6]4-was explored.The results show that LDH exhibits a rapid adsorption rate,achieving equilibrium within 20 min. LDO has a higher adsorption capacity,reaching a maximum of 234.4 mg/g.The adsorption is effective at pH values between 7 and 12.The adsorbent also demonstrates selective adsorption of [Fe(CN)6]4-in solutions containing high concentrations of SO2-4 and SCN-.Mechanism analysis indicates that in LDH intercalated anions,only Cl- can exchange with [Fe(CN)6]4-,leading to adsorption and forming Al[FeMg(CN)6].The adsorption of [Fe(CN)6]4-by LDO is attributed to its memory effect with higher CO2-3 content in LDH layers corresponding to greater adsorption capacity of LDO.
Keywords:
MgAl layered double (hydro)oxides;intercalated anion;ferrocyanide ion;selectivity;adsorption mechanism;wastewater treatment
