Controllable synthesis of starch-modified ZnMgAl-LDHs for adsorption property improvement
Controllable synthesis of starch-modified ZnMgAl-LDHs for adsorption property improvement
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DOI：
10.1016/j.apsusc.2018.06.264
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发表时间：
2018-11
影响因子：
6.7
通讯作者：
Xumei Tao;Delu Liu;Wenwen Cong;Liang Huang
中科院分区：
文献类型：
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作者：
Xumei Tao;Delu Liu;Wenwen Cong;Liang Huang
采用共沉淀法制备了ZnMgAl-LDHs，并对其进行了淀粉改性，以改变其结构，提高其吸附性能。采用XRD、BET、SEM、FT-IR等手段对样品进行表征，研究了淀粉溶液用量、MO初始浓度、吸附剂用量对样品吸附性能的影响。当淀粉与Al 3+的摩尔比为0.0625，在450 °C下焙烧5 h后，淀粉改性的LDH样品具有较高的结晶度、较大的比表面积和较多的介孔，有利于吸附过程的进行，对甲基橙子（MO）的吸附容量达到1555 mg/g。吸附动力学数据符合准二级动力学方程，吸附等温线符合Langmuir方程。淀粉掺杂法是提高吸附性能的有效手段。
ZnMgAl-LDHs were prepared by co-precipitation method and modified with starch to transform the structure for the adsorption property improvement. Samples were characterized by XRD, BET, SEM and FT-IR. Effect of starch soluble dosage, initial MO concentration and absorbent dosage on adsorption property of samples was studied. LDH samples modified by starch with starch versus Al3+mole ratio of 0.0625 and calcinated at 450 °C for 5 h, exhibited higher crystallinity, higher surface area and more mesopores, which were beneficial to the adsorption process, the adsorption capacity on methyl orange (MO) reached 1555 mg/g. The kinetic data of adsorption were well fitted by the pseudo-second-order kinetic equation, while the isotherm data were well represented by the Langmuir equation. Starch doped method was a valid means to enhance adsorption performance.