One-step preparation of lignin-based magnetic biochar as bifunctional material for the efficient removal of Cr(VI) and Congo red: Performance and practical application

Yongchang Sun; Tingting Wang; Caohui Han; Lu Bai; Xiaoyin Sun

doi:10.1016/j.biortech.2022.128373

One-step preparation of lignin-based magnetic biochar as bifunctional material for the efficient removal of Cr(VI) and Congo red: Performance and practical application

Bioresour Technol. 2023 Feb:369:128373. doi: 10.1016/j.biortech.2022.128373. Epub 2022 Nov 21.

Authors

Yongchang Sun¹, Tingting Wang², Caohui Han², Lu Bai², Xiaoyin Sun²

Affiliations

¹ Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, School of Water and Environment, Chang'an University, Xi'an 710054, China; Department of Environmental Engineering, School of Water and Environment, Chang'an University, Xi'an 710054, China. Electronic address: sunyongchang60@163.com.
² Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, School of Water and Environment, Chang'an University, Xi'an 710054, China; Department of Environmental Engineering, School of Water and Environment, Chang'an University, Xi'an 710054, China.

PMID: 36423759
DOI: 10.1016/j.biortech.2022.128373

Abstract

The lignin-based magnetic biochar (LMB) was fabricated with a facile one-step solvothermal method. The spherical Fe₃O₄ was successfully loaded on the lignin-based biochar. LMB could efficiently remove Cr(VI) and Congo red (CR) synergistically with the adsorption of biochar and the catalytic/reduction of Fe₃O₄. LMB showed a removal efficiency of 100 % for Cr(VI) (100 mg/L) at 30 min. The LMB could be a catalyst to activate persulfate (PS) to degrade CR. The LMB + PS system showed a removal efficiency of 94.3 % for CR at 60 min. Moreover, LMB could simultaneously remove 41.5 % of Cr(VI) and 91.5 % of CR in the mixed Cr(VI) and CR solution. The simulated wastewater studies showed that LMB exhibited superior high Cr(VI) (100 %) and CR (82 %) removal efficiencies with the coexistent of anions, cations, and organic matter. LMB can be effectively applied to remove Cr(VI) and CR and purify different contaminated water bodies.

Keywords: Biochar; Cr(VI); Dyes; Fe(3)O(4); Lignin.

MeSH terms

Adsorption
Charcoal
Chromium
Congo Red*
Lignin
Magnetic Phenomena
Water Pollutants, Chemical* / analysis

Substances

biochar
chromium hexavalent ion
Congo Red
Lignin
Water Pollutants, Chemical
Charcoal
Chromium