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Nitrate removal from aqueous solutions by magnetic cationic hydrogel: Effect of electrostatic adsorption and mechanism
Li, Junyi; Dong, Shuoxun; Wang, Yili; Dou, Xiaomin; Hao, Haotian
2020-05
Source PublicationJOURNAL OF ENVIRONMENTAL SCIENCES
ISSN1001-0742
Volume91Pages:177-188
AbstractExcessive nitrate (NO3-) is among the most problematic surface water and groundwater pollutants. In this study, a type of magnetic cationic hydrogel (MCH) is employed for NO3- adsorption and well characterized herein. Its adsorption capacity is considerably pH-dependent and achieves the optimal adsorption (maximum NO3--adsorption capacity is 95.88 +/- 1.24 mg/g) when the pH level is 5.2-8.8. The fitting result using the homogeneous surface diffusion model indicates that the surface/film diffusion controls the adsorption rate, and NO3- approaches the center of MCH particles within 30 min. The diffusion coefficient (D-s) and external mass transfer coefficient (k(F)) in the liquid phase are 1.15 x 10(-6) cm(2)/ min and 4.5 x 10(-6) cm/min, respectively. The MCH is employed to treat surface water that contains 10 mg/L of NO3-, and it is found that the optimal magnetic separation time is 1.6 min. The high-efficiency mass transfer and magnetic separation of MCH during the adsorption-regeneration process favors its application in surface water treatment. Furthermore, the study of the mechanism involved reveals that both -N+(CH3)(3) groups and NO3- are convoluted in adsorption via electrostatic interactions. It is further found that ion exchange between NO3- and chlorine occurs. (C) 2020 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
Department水污染控制实验室
KeywordAdsorption Nitrate removal Low concentration Electrical stern layer Magnetic cationic hydrogel
Document Type期刊论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/45051
Collection水污染控制实验室
Recommended Citation
GB/T 7714
Li, Junyi,Dong, Shuoxun,Wang, Yili,et al. Nitrate removal from aqueous solutions by magnetic cationic hydrogel: Effect of electrostatic adsorption and mechanism[J]. JOURNAL OF ENVIRONMENTAL SCIENCES,2020,91:177-188.
APA Li, Junyi,Dong, Shuoxun,Wang, Yili,Dou, Xiaomin,&Hao, Haotian.(2020).Nitrate removal from aqueous solutions by magnetic cationic hydrogel: Effect of electrostatic adsorption and mechanism.JOURNAL OF ENVIRONMENTAL SCIENCES,91,177-188.
MLA Li, Junyi,et al."Nitrate removal from aqueous solutions by magnetic cationic hydrogel: Effect of electrostatic adsorption and mechanism".JOURNAL OF ENVIRONMENTAL SCIENCES 91(2020):177-188.
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