Microwave regeneration of spent activated carbon for the treatment of ester-containing wastewater | Zendy

Tianlong Zheng | Zendy; Qunhui Wang | Zendy; Zhining Shi | Zendy; Zhihui Zhang | Zendy; Yuhui Ma | Zendy

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Microwave regeneration of spent activated carbon for the treatment of ester-containing wastewater

Author(s) -

Tianlong Zheng,

Qunhui Wang,

Zhining Shi,

Zhihui Zhang,

Yuhui Ma

Publication year - 2016

Publication title -

rsc advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.746

H-Index - 148

ISSN - 2046-2069

DOI - 10.1039/c6ra05211h

Subject(s) - activated carbon , wastewater , regeneration (biology) , waste management , microwave , microwave irradiation , chemistry , pulp and paper industry , nuclear chemistry , organic chemistry , biology , catalysis , adsorption , engineering , telecommunications , microbiology and biotechnology

In this study, an integrated granular activated carbon (GAC) adsorption/microwave (MW) irradiation process was used for the treatment of ester-containing wastewater from a lithium-ion battery (LIB) factory. Firstly, ester-containing organic matter was adsorbed onto GAC, then the pollutants were decomposed. The GAC was then regenerated by MW irradiation. The efficacy of this procedure was analyzed by determining adsorption effectiveness, adsorption kinetics and the textural properties of GAC in successive GAC adsorption/MW cycles. The mechanism of MW regeneration was investigated by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric (TG) analysis. The results show that the adsorption isotherms and kinetics for the adsorption of ester contaminants are in accordance with Langmuir isotherm and pseudo second-order kinetic models. It was also found that though the adsorption rate constant (k2) of GAC increased with the adsorption/MW regeneration cycles, the adsorption capacity (qm) decreased where the qm of GAC at the 5th regeneration cycle had a 20.4% reduction in comparison to the determined original GAC, which could be explained by changes in the GAC's textural properties. The GAC adsorption/MW process mainly occurred at the peak of 1117 cm−1 by FTIR. Through TG and differential thermogravimetric (DTG) analyses, the weight loss of saturated GAC took place between 120 °C and 260 °C, caused by the decomposition of ester organic molecules.

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