Efficient adsorption of methylene blue from aqueous solution by graphene oxide modified persimmon tannins

被引：112
作者：
Wang, Zhongmin [1 ]
Gao, Mingmin [1 ]
Li, Xiaojuan [1 ]
Ning, Jinliang [1 ]
Zhou, Zhide [2 ]
Li, Guiyin [2 ]
机构：
[1] Guilin Univ Elect Technol, Sch Mat Sci & Engn, Guilin 541004, Guangxi, Peoples R China
[2] Guilin Univ Elect Technol, Sch Life & Environm Sci, Guilin 541004, Guangxi, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS | 2020年 / 108卷
基金：
中国国家自然科学基金;
关键词：
Persimmon tannin; Graphene oxide; Bio-adsorbent; Methylene blue; Adsorption; IONS ADSORPTION; METAL-IONS; REMOVAL; COMPOSITE; ADSORBENT; PERFORMANCE; CARBON; WATER; DYE; MECHANISM;
D O I：
10.1016/j.msec.2019.110196
中图分类号：
TB3 [工程材料学]; R318.08 [生物材料学];
学科分类号：
0805 ; 080501 ; 080502 ;
摘要：
With the rapid development of dye and textile industry, the pollution of dye wastewater has aroused widespread public concern due to the potential risk to human health. Therefore, it is of significance for the removal of dye pollutants from wastewater. In this work, a green and efficient bio-adsorbent, graphene oxide modified persimmon tannin (PT-GO), has been fabricated through glutaraldehyde crosslinking method for efficient adsorption of methylene blue (MB) from aqueous solutions. The prepared PT-GO bio-adsorbent was analyzed by scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, x-ray photoelectron spectra GIPS) and Brunauer-Emmett-Teller (BET) analysis. The adsorption behavior of the VT-GO bio-adsorbent towards MB dye in a batch adsorption process was investigated. The maximum MB adsorption capacity achieved 256.58 mg g(-1) with MB concentration of 35 mg L-1 at 323 K. The Freundlich equilibrium isotherm and the pseudo-second order model fit the adsorption behavior very well. Thennodynamics data revealed that the adsorption of MB onto PT-GO bio-adsorbent was feasible, spontaneous and endothermic. Redox reactions, electrostatic interactions and pi-pi interactions dominated the adsorption of MB onto PT-GO bio-adsorbent. In addition, the regeneration of the PT-GO was efficiently achieved and MB removal efficiency remained high (88.3%) after fifth cycles. All these results indicated that PT-GO bio-adsorbent could be a promising biomass adsorbent for the removal of organic dye contaminants with non-toxic, efficient and low cost.
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页数：9
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