4.2 Article

Nitrate removal from aqueous solutions by magnetic cationic hydrogel: Effect of electrostatic adsorption and mechanism

期刊

JOURNAL OF ENVIRONMENTAL SCIENCES
卷 91, 期 -, 页码 177-188

出版社

SCIENCE PRESS
DOI: 10.1016/j.jes.2020.01.029

关键词

Adsorption; Nitrate removal; Low concentration; Electrical stern layer; Magnetic cationic hydrogel

资金

  1. National Key Research and Development Program of China [2017YFC0505303]
  2. China Major Science and Technology Project of Water Pollution Control and Management, China [2017ZX07202003]
  3. National Natural Science Foundation of China [51478041, 51678053]

向作者/读者索取更多资源

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.

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