Journal of Polymers and the Environment ( IF 5.3 ) Pub Date : 2022-04-22 , DOI: 10.1007/s10924-022-02451-z Miaoyang Huang 1 , Wenjing Yan 1 , Linye Zhang 1 , Zehua He 1 , Jiahao Ma 1 , Yifu Ding 1 , Junjin Ou 1 , Shenggui Chen 1 , Wenli Jiang 1 , Xiyi Dai 1 , Zhongmin Li 1, 2 , Guangtao Wei 1, 3
A novel cation–anion adsorbent based on dialdehyde carboxymethyl cellulose (DCMC) and tannin (TA) was produced. The obtained absorbents were characterized by the scanning electron microscopy, energy dispersive spectrometer, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The influences of absorbent dosage, pH values, initial concentration and temperature on Cr(VI) adsorption and Ni(II) adsorption were discussed. Adsorption results were evaluated by four kinetic models and four adsorption isotherms fitting. The adsorption capacities of Cr(VI) and Ni(II) on TA/DCMC were 281.94 mg/g and 43.68 mg/g, respectively. The adsorption kinetics of Cr(VI) and Ni(II) on TA/DCMC were both consistent with the pseudo-second-order kinetics model. Besides, the adsorption data of Cr(VI) fitted into the Langmuir model and the adsorption results of Ni(II) fitted into the Freundlich model. Thermodynamic analysis demonstrated the adsorption was endothermic, spontaneous, and entropy increased process. The restrained adsorption followed the order Cl− > NO− 3 > H2PO− 4 > HCO− 3 for Cr(VI) adsorption and Pb(II) > Ca(II) > Cu(II) > Zn(II) for Ni(II). After 4 recycles, the Cr(VI) and Ni(II) adsorption capacities were 52.89% and 68.95% of the absorbent in first use, respectively. The absorbent shows great potential in water treatment field.
中文翻译:
单宁-二醛羧甲基纤维素的新型阳离子-阴离子吸附剂,用于去除水溶液中的 Cr(VI) 和 Ni(II),具有高吸附能力
制备了一种基于二醛羧甲基纤维素(DCMC)和单宁(TA)的新型阳离子-阴离子吸附剂。用扫描电子显微镜、能量色散光谱仪、傅里叶变换红外光谱仪和X射线光电子能谱仪对所得吸附剂进行了表征。讨论了吸收剂用量、pH值、初始浓度和温度对Cr(VI)吸附和Ni(II)吸附的影响。通过四种动力学模型和四种吸附等温线拟合评估吸附结果。TA/DCMC对Cr(VI)和Ni(II)的吸附量分别为281.94 mg/g和43.68 mg/g。Cr(VI)和Ni(II)在TA/DCMC上的吸附动力学均符合准二级动力学模型。除了,将 Cr(VI) 的吸附数据拟合到 Langmuir 模型和 Ni(II) 的吸附结果拟合到 Freundlich 模型。热力学分析表明吸附是吸热、自发和熵增的过程。受约束的吸附遵循Cl的顺序- > NO - 3 > H 2 PO - 4 > HCO - 3吸附 Cr(VI) 和 Pb(II) > Ca(II) > Cu(II) > Zn(II) 吸附 Ni(II)。4次循环后,Cr(VI)和Ni(II)的吸附量分别为首次使用吸收剂的52.89%和68.95%。该吸附剂在水处理领域显示出巨大的潜力。