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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received April 1, 2019
Accepted June 27, 2019

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Nitrate removal from water phase using Robinia pseudoacacia bark for solving eutrophication

Min-Ji Kim Suk Soon Choi^1† Phani Brahma Somayajulu Rallapalli² Jeong Hyub Ha² Seung-Mok Lee³ Young-Seak Lee^†

Department of Applied Chemistry and Biological Engineering, Chungnam National University, Daejeon 34134, Korea ¹Department of Biological and Environmental Engineering, Semyung University, Jecheon 27136, Korea ²Department of Integrated Environmental Systems, Pyeongtaek University, Pyeongtaek 17869, Korea ³Department of Health and Environment, Catholic Kwandong University, Gangneung 25601, Korea

Korean Journal of Chemical Engineering, September 2019, 36(9), 1450-1454(5), 10.1007/s11814-019-0331-x

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Abstract

The bio-absorbent of Robinia pseudoacacia (R. pseudoacacia) bark was modified with sulfuric acid and their nitrate removal efficiency in water phase was investigated. At 2.5 ppm, the nitrate removal efficiency of R. pseudoacacia bark modified with 2, 4, 6, 8 and 10 M H2SO4 was 54, 61, 69, 72 and 72%, respectively, and the maximum removal efficiency was increased by 100% as compared with the raw R. pseudoacacia bark. The XPS analysis results reveal that the acidic functional groups such as carboxylic, carbonyl and phenol groups were increased by 48% in the 8M H2SO4 modified R. pseudoacacia bark, and the specific surface area and the total pore volume increased by twotimes to 4.94m2/g and 0.0113 cc/g, respectively. In addition, 0.1M sodium hydroxide performed as the best desorption agent for desorption rates using hydrochloric acid, sodium hydroxide and ethylenediamine tetraacetic acid (EDTA), in order to recover the nitrate. Collectively, these results could be employed as economical and practical engineering data for the development of nitrate removal process.

Keywords

Robina pseudoacacia Bark Nitrate Removal Modified with Sulfuric Acid

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