Identifying adsorption sites for Cd(II) and organic dyes on modified straw materials

Wei Liu; Jie Huang; Anthony J Weatherley; Wenjun Zhai; Fuya Liu; Zhiling Ma; Yunhong Jiao; Chao Zhang; Bing Han

doi:10.1016/j.jenvman.2021.113862

Identifying adsorption sites for Cd(II) and organic dyes on modified straw materials

J Environ Manage. 2022 Jan 1:301:113862. doi: 10.1016/j.jenvman.2021.113862. Epub 2021 Oct 4.

Authors

Wei Liu¹, Jie Huang², Anthony J Weatherley³, Wenjun Zhai², Fuya Liu², Zhiling Ma², Yunhong Jiao², Chao Zhang⁴, Bing Han⁵

Affiliations

¹ Key Laboratory of Analytical Science and Technology of Hebei Province, College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, PR China; Institute of Life Science and Green Development, Hebei University, Baoding, 071002, PR China.
² Key Laboratory of Analytical Science and Technology of Hebei Province, College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, PR China.
³ Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, VIC, 3010, Australia.
⁴ College of Civil Engineering, Hunan University, Changsha, 410082, China.
⁵ Key Laboratory of Analytical Science and Technology of Hebei Province, College of Chemistry and Environmental Science, Hebei University, Baoding, 071002, PR China; Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, VIC, 3010, Australia; Institute of Life Science and Green Development, Hebei University, Baoding, 071002, PR China. Electronic address: bing.han@unimelb.edu.au.

PMID: 34619583
DOI: 10.1016/j.jenvman.2021.113862

Abstract

Turning agricultural waste into effective remediation materials is a highly promising approach for reducing in-field crop burning and promoting affordable wastewater treatment. This comparative study aims to identify active adsorption sites for methylene blue (MB), crystal violet (CV), and cadmium (Cd) as model pollutants on wheat straw materials modified by a thermal partial-oxidation process. The optimal modification temperature was found to be 160-180 °C for MB and CV adsorption, which is much lower than that of Cd(II) at 220-240 °C. A strong linear correlation exits between total surface group concentrations and Cd(II) uptake, indicating that both acidic and basic functional groups are favourable adsorption sites of Cd(II). By contrast, basic groups generated at higher modification temperatures might have adverse effects on MB and CV adsorption. These results provided mechanistic insights and predictive approach into reuse of agricultural waste for environmental remediation.

Keywords: Adsorption; Cadmium; Dye; Heavy metal; Modification; Straw; Waste management.

MeSH terms

Adsorption
Cadmium
Charcoal
Coloring Agents
Environmental Restoration and Remediation*
Water Pollutants, Chemical*
Water Purification*

Substances

Coloring Agents
Water Pollutants, Chemical
Cadmium
Charcoal