白腐菌联合纳米零价铁强化去除水中Cd(II)

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Abstract A combined system of white rot fungus and nanoscale zero-valent iron (nZVI) was used to enhance the removal of Cd(II) from water. The effects of pH, Cd(II) initial concentration, temperature and nZVI dosage on Cd(II) removal were examined, and the impact of nZVI on intracellular and extracellular accumulation of cadmium by white rot fungus was investigated. The removal mechanism was analyzed by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and three-dimensional excitation emission matrix fluorescence spectroscopy (3D-EEM). The results showed that the removal efficiency of 50mg/L Cd(II) reached 99.5% after 180 minutes at the conditions of pH 6, nZVI dosage of 0.1g/L and 30℃. The removal process of Cd(II) was found to follow the pseudo second-order kinetic model, and the extracellular adsorption by white rot fungus accounted for the main removal. The addition of nZVI promoted the extracellular adsorption of Cd(II) by white rot fungus. FTIR and XPS analysis showed that the hydroxyl, carboxyl and amino were involved in the adsorption of Cd(II), and the extracellular polymeric substances (EPS) of white-rot fungus could coordinate with iron in the inner layer to form a P-O-Fe bond, accelerating the formation of iron minerals such as lepidocrocite and magnetite that are rich in hydroxyl functional groups, thereby promoting the adsorption and removal of Cd(II) from the solution.

Key words： white rot fungus nanoscale zero-valent iron extracellular polymeric substances cadmium

Received: 25 December 2021

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X703.1

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	Articles by authors
	ZENG Qiao-jing
	ZHOU Xin
	HUANG Chao
	WANG Ping
	CHENG Hao
	ZHENG Xiao-yu
	WANG Meng-xin
	LIU Hao

Cite this article:

ZENG Qiao-jing,ZHOU Xin,HUANG Chao等. Enhanced removal of Cd(II) from aqueous solution by nanoscale zero-valent iron coupled with white rot fungus[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(7): 3174-3183.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I7/3174

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