Diatom Biochar Recovered Au(III) Efficiently from Both Synthetic and Real Electroplating Wastewaters

Wang，Lijuan; Li，Jiawei; Zhong，Gansheng; Li，Jiangpeng; Lu，Xiao; Wang，Siqing; Tang，Yuanyuan

2022

10.1021/acsestwater.3c00066

ACS ES and T Water   影响因子和分区

2690-0637

To face the current critical challenges of gold recovery and beneficial utilization of solid waste, this study synthesized diatom biochar from the anoxic pyrolysis of diatoms and proved the superiority of the diatom biochar as a novel adsorbent for Au(III) in both synthetic and real electroplating wastewaters. The diatom biochar was found to have a high adsorption capacity of 443.0 mg/g and a superior recovery efficiency of up to 92.1%. The Au(III) adsorption kinetics followed the pseudo-second-order and intraparticle diffusion models. Electrostatic attraction and reduction were detected as the major adsorption mechanisms. An exceptional selectivity was also observed for the diatom biochar toward Au(III) with other coexisting heavy metals. Even in the presence of CN in the solution, the diatom biochar still exhibited superiority in Au(III) adsorption. Owing to its high affinity to Au(III), the diatom biochar was successfully applied in real electroplating wastewater containing trace Au(III), with an adsorption efficiency as high as 96.7%. These findings sufficiently demonstrate the excellent performance and economic feasibility of diatoms for Au(III) recovery from electroplating wastewater, which also promoted solid waste minimization of diatom biorefineries.

adsorption Au(III) diatom biochar industrial electroplating wastewater recovery reduction

ESCI

英语

第一 ; 通讯

National Natural Science Foundation of China["41977329","42277403"] ; Natural Science Foundation of Guangdong Province[2021B1515020041]

Environmental Sciences & Ecology ; Water Resources

Environmental Sciences ; Water Resources

WOS:000985548300001

AMER CHEMICAL SOC

2-s2.0-85159577185

Scopus

State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,1088 Xueyuan Blvd,518055,China

Wang，Lijuan,Li，Jiawei,Zhong，Gansheng,et al. Diatom Biochar Recovered Au(III) Efficiently from Both Synthetic and Real Electroplating Wastewaters[J]. ACS ES and T Water,2022,3(5).

Wang，Lijuan.,Li，Jiawei.,Zhong，Gansheng.,Li，Jiangpeng.,Lu，Xiao.,...&Tang，Yuanyuan.(2022).Diatom Biochar Recovered Au(III) Efficiently from Both Synthetic and Real Electroplating Wastewaters.ACS ES and T Water,3(5).

Wang，Lijuan,et al."Diatom Biochar Recovered Au(III) Efficiently from Both Synthetic and Real Electroplating Wastewaters".ACS ES and T Water 3.5(2022).