Natural polymer konjac glucomannan mediated assembly of graphene oxide as versatile sponges for water pollution control

Tao Chen; Peiheng Shi; Jian Zhang; Yi Li; Tao Duan; Lichun Dai; Liang Wang; Xiaofang Yu; Wenkun Zhu

doi:10.1016/j.carbpol.2018.08.133

Natural polymer konjac glucomannan mediated assembly of graphene oxide as versatile sponges for water pollution control

Carbohydr Polym. 2018 Dec 15:202:425-433. doi: 10.1016/j.carbpol.2018.08.133. Epub 2018 Sep 5.

Authors

Tao Chen¹, Peiheng Shi², Jian Zhang², Yi Li², Tao Duan¹, Lichun Dai³, Liang Wang⁴, Xiaofang Yu⁵, Wenkun Zhu⁶

Affiliations

¹ State Key Laboratory of Environmentally Friendly Energy Materials, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, PR China; Sichuan Co-Innovation Center for New Energetic Material, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, PR China.
² State Key Laboratory of Environmentally Friendly Energy Materials, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, PR China.
³ Biogas Institute of Ministry of Agriculture, Chengdu, Sichuan, 610041, PR China.
⁴ Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, PR China. Electronic address: wangliang@caep.cn.
⁵ Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, Sichuan, 621900, PR China. Electronic address: yuxf_caep@sina.com.
⁶ State Key Laboratory of Environmentally Friendly Energy Materials, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, PR China; Sichuan Co-Innovation Center for New Energetic Material, Southwest University of Science and Technology, Mianyang, Sichuan, 621010, PR China. Electronic address: zhuwenkun@swust.edu.cn.

PMID: 30287019
DOI: 10.1016/j.carbpol.2018.08.133

Abstract

Three-dimensional network structure of konjac glucomannan/graphene oxide (KGM/GO) sponges was successfully prepared by ice template method. The KGM/GO sponges was rich in functional groups, negatively charged under pH 2 to 10. Batch adsorption experiment was conducted to investigate the adsorption performance of the as-prepared KGM/GO sponges for organic dye (malachite green (MG)) and radionuclide (uranium U(Ⅵ)). The results showed that the maximum adsorption capacities of KGM/GO sponges were 266.97, 189.96 mg/g for U(Ⅵ) and MG, respectively. Moreover, the KGM/GO sponges exhibited an excellent selectivity for capturing U(Ⅵ) in multi-ion system. The adsorption process was fitted better to pseudo-second order model, while adsorption isotherms for these pollutants were well matched up to Langmuir models. In addition, KGM/GO sponges can be easily separated from the aqueous solution and could be effectively reused for 5 times without obvious loss in adsorption performance. The advantages of eco-friendliness, low cost, simple preparation process, controllable shape and size, as well as high adsorption capacities for MG and U(Ⅵ), suggested that KGM/GO sponges promising in water pollution control.

Keywords: Adsorption; Graphene oxide; Konjac glucomannan; Malachite green; Uranium.