Treating waste with waste: Adsorption of anionic dyes in wastewater with surfactant-modified phosphogypsum

Meng Lu; Yao Wang; Junxia Yu; Dezeng Li; Qingbiao Zhao; Ruan Chi

doi:10.1016/j.envres.2023.116963

Treating waste with waste: Adsorption of anionic dyes in wastewater with surfactant-modified phosphogypsum

Environ Res. 2023 Nov 15;237(Pt 1):116963. doi: 10.1016/j.envres.2023.116963. Epub 2023 Aug 23.

Authors

Meng Lu¹, Yao Wang¹, Junxia Yu², Dezeng Li³, Qingbiao Zhao⁴, Ruan Chi⁵

Affiliations

¹ School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200241, PR China.
² School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China.
³ School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200241, PR China. Electronic address: lidz@chem.ecnu.edu.cn.
⁴ School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, PR China; Hubei Three Gorges Laboratory, No. 1 Mazongling Rd, Xiaoting District, Yichang City, Hubei 443007, PR China. Electronic address: 23031701@wit.edu.cn.
⁵ Hubei Three Gorges Laboratory, No. 1 Mazongling Rd, Xiaoting District, Yichang City, Hubei 443007, PR China.

PMID: 37619625
DOI: 10.1016/j.envres.2023.116963

Abstract

Phosphogypsum (PG) is a solid waste generated during the wet process of phosphoric acid production. The environmental-friendly disposal and recycling of PG is vital in the field of environmental solid waste treatment. In this study, PG is used for adsorbent of dyes in wastewater to achieve the goal of recycling waste with waste. Surfactant-modified phosphogypsum (ODBAC@PG) was prepared using octadecyl dimethyl benzyl ammonium chloride (ODBAC) as modifier. ODBAC@PG exhibits high adsorption capability for anionic dyes (methyl blue (MeB) and indocyanine carmine (IC)). The pseudo-second-order kinetic model fits the kinetic experimental data for the adsorption of two organic anionic dyes. Langmuir adsorption isotherm fits the adsorption characteristics of MeB and IC on ODBAC@PG, exhibiting a monolayer adsorption pattern. Thermodynamic parameters indicate the spontaneous and exothermic properties of MeB and IC on ODBAC@PG. MeB and IC have antagonistic effects on each other in binary adsorption system. High adsorption capacity after six cycles of experiments demonstrates the high reusability of ODBAC@PG. The nature for the adsorption includes electrostatic interaction, hydrogen bond and hydrophobic interaction. Using ODBAC@PG for dyes wastewater treatment can accomplish the goal of treating waste with waste and turning waste into treasure.

Keywords: Adsorption; Anionic organic dye; Phosphogypsum; Regeneration; Surfactant modification.