| 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 Publication | JOURNAL OF ENVIRONMENTAL SCIENCES
 |
| ISSN | 1001-0742 |
| Volume | 91Pages:177-188 |
| Abstract | Excessive 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 |
| Keyword | Adsorption Nitrate removal Low concentration Electrical stern layer Magnetic cationic hydrogel |
| Document Type | 期刊论文 |
| Identifier | https://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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