Efficient benzo(a)pyrene degradation by coal gangue-based catalytic material for peroxymonosulfate activation

Chunquan Li; Shuaijun Yin; Yutong Yan; Chao Liang; Qingshui Ma; Rui Guo; Yubo Zhang; Jiushuai Deng; Zhiming Sun

doi:10.1016/j.jenvman.2023.119645

Efficient benzo(a)pyrene degradation by coal gangue-based catalytic material for peroxymonosulfate activation

J Environ Manage. 2024 Feb:351:119645. doi: 10.1016/j.jenvman.2023.119645. Epub 2023 Dec 3.

Authors

Chunquan Li¹, Shuaijun Yin¹, Yutong Yan¹, Chao Liang¹, Qingshui Ma², Rui Guo², Yubo Zhang³, Jiushuai Deng¹, Zhiming Sun⁴

Affiliations

¹ School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, PR China.
² Inner Mongolia Mengtai Buliangou Coal Industry Co., Ltd, Ordos, 010399, PR China.
³ Huadian Coal Industry Group Digital Intelligence Technology Co., Ltd, Beijing, 102400, PR China.
⁴ School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing, 100083, PR China. Electronic address: zhimingsun@cumtb.edu.cn.

PMID: 38048711
DOI: 10.1016/j.jenvman.2023.119645

Abstract

A low cost and green peroxymonosulfate (PMS) activation catalyst (CG-Ca-N) was successfully prepared with coal gangue (CG), calcium chloride, and melamine as activator. Under the optimal conditions, the CG-Ca-N can remove 100 % for benzo(a)pyrene (Bap) in an aqueous solution after 20 min and 72.06 % in soil slurry medium within 60 min, which also display excellent reuse ability toward Bap after three times. The removal of Bap is significantly decreased when the initial pH value was greater than 9 and obviously inhibited in the presence of HCO₃^- or SO₄^2-. The characterization results indicated that the addition of calcium chloride could stabilize and increase the content of pyridinic N during thermal annealing, resulting in the production of ^•OH, SO₄^•- and ¹O₂. Based on electron paramagnetic resonance (EPR) and active radical scavenging experiments, ¹O₂ could be identified to be the dominant role in Bap degradation. Overall, this work opened a new perspective for the low cost and green PMS catalysts and offered great promise in the practical remediation of organic pollution of groundwater and soil.

Keywords: Calcium chloride; Coal gangue; Persulfate activation; Soil remediation; benzo(a)pyrene.

MeSH terms

Benzo(a)pyrene*
Calcium Chloride
Peroxides* / chemistry
Soil

Substances

peroxymonosulfate
Benzo(a)pyrene
Calcium Chloride
Peroxides
Soil