腐殖酸负载对凹凸棒土吸附Zn(Ⅱ)的影响  

Effect of Humic Acid Loading on Palygorskite's Adsorption of Zn(Ⅱ)

作　　者：唐玉婷[1,2] 丁思淳 韩承霖 TANG Yuting;DING Sichun;HAN Chenglin(School of Electric Power, South China University of Technology, Guangzhou 510640, Guangdong, China;Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization, Guangzhou 510640, Guangdong, China)

机构地区：[1]华南理工大学电力学院,广东广州510640 [2]广东省能源高效清洁利用重点实验室,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2022年第4期110-118,共9页Journal of South China University of Technology(Natural Science Edition)

基　　金：广东省自然科学基金资助项目(2114050000829);广州市科技创新发展专项(202002030105)。

摘　　要：我国对含锌(Zn)废水的排放有着严格的规定,在高效去除废水中Zn(Ⅱ)的吸附材料中,凹凸棒土(PAL)被认为极具应用前景。为验证腐殖酸(HA)对PAL吸附Zn(Ⅱ)的影响,文中采用静态吸附实验,对比腐殖酸/凹凸棒土(HA/PAL)与纯PAL对Zn(Ⅱ)的吸附率,并对PAL和HA/PAL去除水中Zn(Ⅱ)的性能与机理进行了研究。实验结果表明:PAL达到吸附平衡的时间为120 min,温度对吸附过程的影响很小,增加PAL投加量和减少Zn(Ⅱ)的初始质量浓度使PAL对Zn(Ⅱ)的吸附率增大;HA/PAL在120 min时达到吸附平衡,HA/PAL对Zn(Ⅱ)的吸附过程受温度的影响同样不大,投加量的增加和Zn(Ⅱ)初始质量浓度的减小提高了HA/PAL对Zn(Ⅱ)的吸附率;PAL对Zn(Ⅱ)的吸附过程符合Langmuir模型,准一级动力学模型能更好地拟合PAL的实验数据;而HA/PAL对Zn(Ⅱ)的吸附过程更符合Freundlich模型,准一级动力学模型同样能更好地拟合HA/PAL的实验数据;根据热力学参数,PAL和HA/PAL对Zn(Ⅱ)的吸附过程均为吸热过程。在相同工况下,PAL的吸附率均高于HA/PAL,且所有实验工况对PAL的影响均大于其对HA/PAL的影响;SEM、BET和FT-IR的表征结果表明,HA成功负载在了PAL表面,减小了PAL的比表面积。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 pro-mising 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 120 min,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.

关 键 词：Zn(Ⅱ) 腐殖酸 吸附 凹凸棒土 等温线 动力学 热力学 

分 类 号：O647.33[理学—物理化学]