有效去除水中As（V）的Al-Mg-Ca层状双氧化物：酰胺的作用,Journal of Chemical & Engineering Data

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有效去除水中As（V）的Al-Mg-Ca层状双氧化物：酰胺的作用
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2019-03-14 , DOI: 10.1021/acs.jced.8b01154
Sukanya Kundu ₁ , Milan Kanti Naskar ₁

Affiliation

Al-Mg-Ca层状双氧化物（LDO）通过在甲酰胺（F），二甲基甲酰胺（DMF）和二乙基甲酰胺（DEF）存在下于160°C / 24 h的溶剂热过程合成，然后在500°C下煅烧C。研究了不同酰胺在Al–Mg–Ca LDO的形成方面的作用，包括微观结构，结构特性以及从地下水中去除As（V）的表面元素分析。微观结构分析显示菊花花状形态（2-4μm），纳米棒/花瓣状颗粒（10-15 nm）有序排列。DEF改性的Al–Mg–Ca LDO的最大表面积为251 m ²/ g，导致最大的As（V）吸附容量为100 mg / g。XPS研究表明，吸附As（V）后，Al-O和Mg-O的峰移动到更高的结合能，这表明化学环境发生了变化，即与相邻原子共享元素。研究了As（V）吸附的不同参数（如接触时间，剂量浓度，pH和温度）的影响。合成的Al-Mg-Ca LDO用于从印度西部恒河平原地区（印度西孟加拉邦Murshidabad区的Hariharpara区块）收集的地下水中去除As（V）（0.7 ppm），直至<10 ppb。

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Al–Mg–Ca-Layered Double Oxides for Efficient Removal of As(V) from Water: The Role of Amides

Al–Mg–Ca-layered double oxides (LDO) were synthesized by solvothermal process at 160 °C/24 h in the presence of formamide (F), dimethylformamide (DMF), and diethylformamide (DEF), followed by calcination at 500 °C. The role of different amides for the formation of Al–Mg–Ca LDOs in terms of their microstructural behaviors, textural properties, and surface elemental analysis toward the removal of As(V) from groundwater was investigated. Microstructural analysis shows chrysanthemum flower-like morphology (2–4 μm) with orderly arrangement of nanorod/petal-like particles (10–15 nm). DEF-modified Al–Mg–Ca LDO exhibited the highest surface area of 251 m²/g, resulting in the maximum As(V) adsorption capacity of 100 mg/g. The XPS study shows peak shifting of Al–O and Mg–O to a higher binding energy after adsorption of As(V), indicating the change in chemical environment, i.e., sharing of elements with the neighboring atoms. The effects of different parameters, like contact time, dose concentration, pH, and temperature, were investigated for As(V) adsorption. The synthesized Al–Mg–Ca LDOs were used for the removal of As(V) (0.7 ppm) from the groundwater collected from the lower Indo-Gangetic plain area (Hariharpara block at Murshidabad district in West Bengal of India) down to <10 ppb.

更新日期：2019-03-15

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