A strategy-purifying wastewater with waste materials: Zn2+ modified waste red mud as recoverable adsorbents with an enhanced removal capacity of congo red

Dongdong An; Yu Sun; Yan-Ling Yang; Xiao-Lei Shi; Hua-Jun Chen; Li Zhang; Guoquan Suo; Xiaojiang Hou; Xiaohui Ye; Siyu Lu; Zhi-Gang Chen

doi:10.1016/j.jcis.2023.04.176

A strategy-purifying wastewater with waste materials: Zn²⁺ modified waste red mud as recoverable adsorbents with an enhanced removal capacity of congo red

J Colloid Interface Sci. 2023 Sep:645:694-704. doi: 10.1016/j.jcis.2023.04.176. Epub 2023 May 5.

Authors

Dongdong An¹, Yu Sun¹, Yan-Ling Yang², Xiao-Lei Shi³, Hua-Jun Chen⁴, Li Zhang¹, Guoquan Suo¹, Xiaojiang Hou¹, Xiaohui Ye¹, Siyu Lu⁵, Zhi-Gang Chen⁶

Affiliations

¹ School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi'an 710021, China.
² School of Materials Science and Engineering, Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic Materials, Shaanxi University of Science and Technology, Xi'an 710021, China. Electronic address: yangyanling@sust.edu.cn.
³ School of Chemistry and Physics and Center for Materials Science, Queensland University of Technology, Brisbane, QLD 4000, Australia.
⁴ School of Environment and Chemistry, Luoyang Institute of Science and Technology, Luoyang 471023, China.
⁵ Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China.
⁶ School of Chemistry and Physics and Center for Materials Science, Queensland University of Technology, Brisbane, QLD 4000, Australia. Electronic address: zhigang.chen@qut.edu.au.

PMID: 37167918
DOI: 10.1016/j.jcis.2023.04.176

Abstract

The strategy, called purifying wastewater with waste materials (PWWM), can simultaneously improve the secondary utilization of industrial waste materials and in turn, reduce environmental pollution. However, the PWWM strategy has still not been extensively used because of its low purification efficiency of organic pollutants and extremely difficult secondary utilization process. Herein, we use zinc aluminum silicate (ZAS) to modify waste granular red mud (GRM) to form a recoverable adsorbent, called ZAS/GRM adsorbent. The ZAS has been found to exhibit exceptional adsorption performance with the ability to firmly anchor onto the surface of GRM, in which heavy metal ions can effectively solidify and reduce their outflow. Furthermore, many voids have been tactfully designed in the ZAS/GRM adsorbents by using a water vapor project, which provide more active sites for congo red (CR) organic dye, thereby remarkably improving the removal efficiency of CR. From our purification of CR, we find that the CR adsorption capacity of the ZAS/GRM adsorbent is 3.509 mg g^-1, which is four times higher than pure GRM (0.820 mg g^-1). This study demonstrates our PWWM strategy is highly effective and can inspire more research on waste reuse.

Keywords: Adsorbents; Congo red; Red mud; Wastewater; Zinc aluminum silicate.