Superior adsorption capacity of functionalised straw adsorbent for dyes and heavy-metal ions

Qiming Liu; Yaoyue Li; Huafeng Chen; Jian Lu; Guangsuo Yu; Maxim Möslang; Yanbo Zhou

doi:10.1016/j.jhazmat.2019.121040

Superior adsorption capacity of functionalised straw adsorbent for dyes and heavy-metal ions

J Hazard Mater. 2020 Jan 15:382:121040. doi: 10.1016/j.jhazmat.2019.121040. Epub 2019 Aug 19.

Authors

Qiming Liu¹, Yaoyue Li¹, Huafeng Chen¹, Jian Lu¹, Guangsuo Yu², Maxim Möslang³, Yanbo Zhou⁴

Affiliations

¹ State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, No. 130, Meilong Road, Shanghai, 200237, China.
² Institute of clean coal technology, East China University of Science and Technology, No. 130, Meilong Road, Shanghai, 200237, China.
³ Institut für Umwelt- und Verfahrenstechnik UMTEC, HSR University of Applied Sciences Rapperswil, Oberseestrasse 10, CH-8640, Rapperswil, Switzerland.
⁴ State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, No. 130, Meilong Road, Shanghai, 200237, China; Shanghai Institute of Pollution Control and Ecological Security, No. 1515 Zhongshan Second North Road, Hongkou District, Shanghai, 200092, China. Electronic address: zhouyanbo@ecust.edu.cn.

PMID: 31470294
DOI: 10.1016/j.jhazmat.2019.121040

Abstract

Dyes and heavy-metal ions are common pollutants in printing and dyeing wastewater, and are thus attracting considerable attention. Herein, an eco-friendly straw-based adsorbent, WS-CA-AM, was prepared by grafting with acrylamide (AM) and citric acid (CA) groups to remove representative dyes and heavy metals from aqueous solution. The adsorption capacities of WS-CA-AM for methyl orange (MO) and methylene blue (MB) were 3053.48 and 120.84 mg/g, which were 54 and 3 times those of unmodified straw, respectively. Moreover, the adsorption capacities for MB, MO, Cr₂O₇^2- and Cu²⁺ in the mixed system increased by 210%, 133%, 196% and 151%, respectively, compared with those in the single system. The significant increase in adsorption capacity can be attributed to the collaborative effect through electrostatic attraction. The functional groups and adsorbed pollutants all served as adsorption sites for pollutants. These results indicate that WS-CA-AM is a potential applicant for the removal of dyes and heavy-metal ions from mixed aqueous solution.

Keywords: Adsorption; Dye; Dyeing wastewater; Heavy metals; Straw.

Publication types

Research Support, Non-U.S. Gov't