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Volume 9 , Issue 6 , December 2021 , Pages: 120 - 126
Study on the Adsorption Performance of Amino-grafted Composite Kaolin for Nickel-containing Wastewater
Chen Dong, School of Environmental and Safety Engineering, Changzhou University, Changzhou, China
Zhang Fenge, School of Environmental and Safety Engineering, Changzhou University, Changzhou, China
Received: Oct. 31, 2021;       Accepted: Nov. 17, 2021;       Published: Nov. 24, 2021
DOI: 10.11648/j.sr.20210906.14        View        Downloads  
Abstract
With the rapid development of industrialization, the pollution of nickel-containing wastewater produced by non-ferrous metal smelting is becoming more and more serious. In order to meet the urgent requirements for the discharge of nickel-containing wastewater, effective and economic treatment technologies and materials are pursued. The experiment used natural kaolin as the main raw material was calcined at 500°C and combined with natural zeolite. Through orthogonal test, the calcined kaolin and natural zeolite 2: 1, N-2-aminoethyl-3-aminopropyl trimethoxy silane coupling agent (KH792) was used to modify the composite sample to obtain the modified composite kaolin adsorbent. XRD, SEM, BET and FT-IR were used for characterization before and after modification. It was found that the amino functional groups in KH792 were successfully grafted onto the surface of the composite kaolin. After modification, the specific surface area of composite kaolin increases from 9.522m2/g to 13.517m2/g, and the pore size expands from 10.022nm to 15.143nm. The adsorption performance of Ni2+ and its influencing factors were studied by using modified composite kaolin. Through the study, it was determined that the concentration of Ni2+ of 30 ml test water was 80 mg·L-1, and the modified kaolin was added 0.2g and adsorbed for 240 min at 25°C and pH 5.45. The removal rate increased from 54.9% to 99.94%. The adsorption process follows the quasi-second-order kinetic model, and the adsorption isotherm corresponds to the Langmuir model.
Keywords
Kaolin, Adsorption, Heavy Metals, Diamino Modification
To cite this article
Chen Dong, Zhang Fenge, Study on the Adsorption Performance of Amino-grafted Composite Kaolin for Nickel-containing Wastewater, Science Research. Vol. 9, No. 6, 2021, pp. 120-126. doi: 10.11648/j.sr.20210906.14
Copyright
Copyright © 2021 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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