巯基改性玉米秸秆对水中Cu（Ⅱ）的吸附特性

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Abstract The influences of different conditions on the adsorption of mercaptoacetyl corn straw (MACS) for Cu(Ⅱ) in water sample were studied in this work. The removal efficiency of Cu(Ⅱ) could reach 97.94% at the oscillation rate of 250r/min, the adsorption temperature of 40℃, the adsorption time of 60min, and the initial pH value of 6.0. The quasi-second-order kinetics could accurately describe the adsorption process when the adsorption reached equilibrium at 60min, and the R² value could reach 0.9994 at 45℃. Furthermore, the adsorption process conformed to Freundlich isotherm adsorption model at the low temperatures of 25~35℃, and the adsorption process was non-spontaneous and exothermic. At the high temperatures of 40~60℃, the adsorption process conformed to Langmuir isothermal adsorption model, and the adsorption process was spontaneous and endothermic. Scanning electron microscopy analysis showed that lots of pores and channels in MACS were filled after the adsorption of Cu(Ⅱ). Energy dispersive spectroscopy analysis detected Cu existed in MACS after adsorption. Fourier transform infrared spectroscopy analysis showed that the S-H vibrational peak and hydrogen bond of MACS weakened after adsorption. The main adsorption mechanism of MACS for Cu(Ⅱ) was the chemical coordination between oxygen-containing and sulfur-containing groups on the surface of MACS and Cu(Ⅱ), accompanied by physical adsorption and electrostatic adsorption.

Key words： corn straw mercaptoacetic acid Cu(Ⅱ) adsorption model adsorption mechanism

Received: 03 August 2021

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X703

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	LIU Xiu-yun
	WANG Gang
	LEI Yu-xin
	XU Min
	ZHANG Yong-ping

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LIU Xiu-yun,WANG Gang,LEI Yu-xin等. Adsorption performance and mechanism of mercaptoacetyl corn straw for Cu（Ⅱ） in aqueous solution[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(3): 1220-1229.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I3/1220

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