Controllable synthesis of starch-modified ZnMgAl-LDHs for adsorption property improvement

• Published in: Applied surface science Vol. 457; pp. 572 - 579
• Main Authors: Tao, Xumei, Liu, Delu, Cong, Wenwen, Huang, Liang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.11.2018
• Subjects: Controllable synthesis; MO adsorption; Starch soluble; ZnMgAl-LDHs; Starch soluble; MO adsorption; ZnMgAl-LDHs; Controllable synthesis
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2018.06.264

[Display omitted] •Starch modification was effective for adsorption property improvement.•ZnMgAl-LDHs (LDO-S2) exhibited high adsorption capacity of 1555 mg/g.•Langmuir equation gave more satisfactory fitting to the MO adsorption on ZnMgAl-LDHs. 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.