Multi-walled carbon nanotubes facilitated Roxarsone elimination in SR-AOPs by accelerating electron transfer in modified electrolytic manganese residue and forming surface activated-complexes

Mengke Li; Zhiguo He; Hui Zhong; Liang Hu; Wei Sun

doi:10.1016/j.watres.2021.117266

Multi-walled carbon nanotubes facilitated Roxarsone elimination in SR-AOPs by accelerating electron transfer in modified electrolytic manganese residue and forming surface activated-complexes

Water Res. 2021 Jul 15:200:117266. doi: 10.1016/j.watres.2021.117266. Epub 2021 May 19.

Authors

Mengke Li¹, Zhiguo He², Hui Zhong³, Liang Hu¹, Wei Sun¹

Affiliations

¹ School of Minerals Processing and Bioengineering, Key Laboratory of Biohydrometallurgy of Ministry of Education, Central South University, Changsha 410083, China.
² School of Minerals Processing and Bioengineering, Key Laboratory of Biohydrometallurgy of Ministry of Education, Central South University, Changsha 410083, China; Faculty of Materials Metallurgy & Chemistry, Jiangxi University of Science & Technology, Ganzhou, Jiangxi, 341000, China. Electronic address: zghe@csu.edu.cn.
³ School of Life Science, Central South University, Changsha, 410012, China. Electronic address: hmmzhjj@csu.edu.cn.

PMID: 34058487
DOI: 10.1016/j.watres.2021.117266

Abstract

A novel catalyst (MT/EMR) used for SR-AOPs with high removal efficiency toward roxarsone (ROX) (90.96% within 60 min) was prepared for the first time by ball milling multi-walled carbon nanotubes (MWCNTs) with electrolytic manganese residue (EMR). The incorporation of MWCNTs could improve the adsorption capacity and accelerate the transformation of metals in EMR with partial mass loss to facilitate the PDS activation. Additionally, pH test, quenching experiment and electrochemical test verified a two-electron pathway involving surface activated-complex contributed to the directly ROX oxidization. Benefit from the introduction of MWCNTs, the degradation rate (k_obs) of catalytic reaction was increased by 10.1 times compared with that of single-EMR. Additionally, the M-O-C (M=Fe or Mn) bonds in MT/EMR making the catalyst more stable than EMR. This work provided a novel and effective strategy to establish waste solid-based catalysts for green preparation and expanded the adsorption-oxidation technology to solve the problem of organoarsenic pollution.

Keywords: Carbon nanotubes; Electrolytic manganese residue; Electron transfer; Peroxydisulfate; Radical.

MeSH terms

Electrolysis
Electrons
Manganese
Nanotubes, Carbon*
Roxarsone*

Substances

Nanotubes, Carbon
Manganese
Roxarsone