钙盐辅助热活化煤矸石及其活化PMS降解苯并［a］芘性能研究

doi:10.19964/j.issn.1006-4990.2024-0193

Abstract

Abstract:

Based on the urgent need for the comprehensive utilization of bulk solid waste from coal gangue and the treatment of polycyclic aromatic hydrocarbon organic pollution in coal industry areas，coal gangue-based potassium persulfate composite salt（PMS） catalytic materials（CG/Ca） were prepared by using coal gangue（CG） as the raw material and calcium chloride as the activator under anaerobic calcination conditions.The effects of calcium chloride dosage and calcination temperature on the degradation of benzo［a］pyrene were systematically studied.The phase composition，surface morphology，specific surface area，pore structure，and chemical bond changes of CG and CG/Ca samples were characterized，and the active species in the degradation system were clarified by electron paramagnetic resonance（EPR）.The results showed that after calcining coal gangue with an equal amount of calcium chloride at 750 ℃ for 90 minutes，the prepared CG/Ca could completely remove benzo［a］pyrene within 30 minutes，and its reaction rate constant was about 55 times that of calcined coal gangue（CG/Ca-0）.Furthermore，the silicon-aluminum skeleton contained in CG was combined with Ca²⁺ in calcium chloride to form calcium aluminum garnet containing Si—O—Ca bonds，resulting in an increase in pore volume and average pore size simultaneously.CG/Ca exhibited excellent activation performance in acidic and neutral environments（pH=3~7），and the influence of Cl^- and H₂PO₄^- anions on the degradation of benzo［a］pyrene was limited in the environment，indicating the promising application prospects of CG/Ca materials.In the system，·OH，SO₄^•-，·O₂^- and ¹O₂ all promoted the degradation of benzo［a］ pyrene.

Key words: coal gangue, persulfate activation, advanced oxidation processes, benzo［a］ pyrene, calcium chloride

CLC Number:

HAN Wei, SONG Yongming, LIU Qi, XU Jinling, XU Rong, LI Chunquan, YIN Shuaijun, SUN Zhiming. Study on performance of calcium chloride assisted thermal activation of coal gangue and its peroxymonosulfate activation toward benzo（a）pyrene degradation[J]. Inorganic Chemicals Industry, 2025, 57(1): 103-112.

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样品	S_BET/ （m²·g^-1）	V_Pore/ （cm³·g^-1）	平均孔径/ nm
CG	16.30	0.027	6.7
CG/Ca-0	3.03	0.008	11.0
CG/Ca-1.0	4.04	0.012	12.2
CG/Ca-1.5	3.11	0.024	30.9

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Study on performance of calcium chloride assisted thermal activation of coal gangue and its peroxymonosulfate activation toward benzo（a）pyrene degradation

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