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摘要
In China, there are strict regulations on the discharge of wastewater containing Zn(Ⅱ). Among adsorptive materials that can efficiently remove Zn(Ⅱ) from wastewater, palygorskite (PAL) is considered to be a promising one. To verify the effect of humic acid (HA) on PAL's adsorption of Zn(Ⅱ), this paper carried out static adsorption experiments and compared the adsorption rates of Zn(Ⅱ) by humic acid/palygorskite (HA/PAL) and pure PAL. And the performance and mechanism of removing Zn(Ⅱ) from aqueous solution by PAL and HA/PAL was studied. The results show that the adsorption equilibrium time of PAL is 120 min, and temperature had little effect on the adsorption process;the adsorption rate of Zn(Ⅱ) by PAL increases with the increase of the dosage and the decrease of the Zn(Ⅱ) initial mass concentration. The adsorption equilibrium of HA/PAL is achieved at 120min, and the adsorption process of Zn(Ⅱ) by HA/PAL is also not affected by temperature, and the increase of the dosage and the decrease of the Zn(Ⅱ) initial mass concentration can improve the adsorption rate of Zn(Ⅱ) by HA/PAL. The adsorption process of Zn(Ⅱ) by PAL fits the Langmuir model, and the pseudo-first-order kinetic model can better fit the experimental data of PAL. However, the adsorption process of Zn(Ⅱ) by HA/PAL is more consistent with Freundlich model, and the pseudo-first-order kinetic model also fits better the experimental data of HA/PAL. According to thermodynamic parameters, the adsorption of Zn(Ⅱ) by PAL and HA/PAL is endothermic. Under the same conditions, the adsorption rate of Zn(Ⅱ) by PAL is higher than that of Zn(Ⅱ) by HA/PAL, and the influence of all experimental conditions on PAL is greater than that of HA/PAL. The characterization results of SEM, BET and FT-IR show that HA is successfully loaded on PAL surface and reduced PAL specific surface area.
? 2022, Editorial Department, Journal of South China University of Technology. All right reserved.
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