Study on the performance and structure of low graphitized biochar prepared by silica template method for adsorbing odorous gases

IF 6.2 2区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Analytical and Applied Pyrolysis Pub Date : 2025-09-30 DOI:10.1016/j.jaap.2025.107411

Ruiying Wang , Fen Li , Hong Yan , Oxana P. Taran , Ying Yang , Dongdong Yang

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Abstract

Research on the removal of sulfur-containing malodorous gases from air via biochar adsorption demonstrates significant application potential. In this study, silicon-modified graphitized carbon was synthesized through pyrolysis using peanut shells, rice husks, and walnut shells as precursors. Among the resulting materials, rice husk-derived biochar (DK-700–5) and walnut shell-derived biochar (HT-800–10) exhibited pronounced targeted adsorption toward CH₃SH and H₂S, respectively. The sulfur adsorption capacity of DK-700–5 was 8.3 times higher than that of unmodified rice husk biochar, while HT-800–10 achieved a 2.45-fold enhancement in H₂S adsorption compared to its unmodified counterpart. Carboxyl and oxygen vacancies on DK-700–5 were identified as critical for CH₃SH adsorption, facilitating its immobilization and gradual oxidation to sulfate (SO₄²⁻), with intermediate sulfur species such as R–SO–R, S⁰, and C–S detected. In parallel, HT-800–10 adsorbed and oxidized H₂S through its porous structure and surface superoxide radicals, converting it into elemental sulfur (S⁰) and sulfate (SO₄²⁻), thereby achieving efficient adsorption and oxidative transformation.

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二氧化硅模板法制备低石墨化生物炭吸附恶臭气体的性能及结构研究

生物炭吸附法去除空气中含硫恶臭气体的研究具有重要的应用潜力。本研究以花生壳、稻壳、核桃壳为前驱体，通过热解法制备了硅改性石墨化碳。所得材料中，稻壳生物炭（DK-700-5）和核桃壳生物炭（HT-800-10）分别对CH₃SH和H₂S具有明显的靶向吸附作用。DK-700-5对硫的吸附能力是未改性稻壳生物炭的8.3倍，HT-800-10对H₂S的吸附能力是未改性稻壳生物炭的2.45倍。DK-700-5上的羧基和氧空位被认为是CH₃SH吸附的关键，促进了CH₃SH的固定和逐渐氧化成硫酸（SO₄²⁻），并检测到中间硫物质，如R-SO-R， S⁰和C-S。同时，HT-800-10通过其多孔结构和表面超氧自由基吸附和氧化H₂S，将其转化为单质硫（S⁰）和硫酸盐（SO₄²⁻），从而实现有效的吸附和氧化转化。

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来源期刊

Journal of Analytical and Applied Pyrolysis 化学-分析化学

CiteScore

9.10

自引率

11.70%

发文量

340

审稿时长

44 days

期刊介绍： The Journal of Analytical and Applied Pyrolysis (JAAP) is devoted to the publication of papers dealing with innovative applications of pyrolysis processes, the characterization of products related to pyrolysis reactions, and investigations of reaction mechanism. To be considered by JAAP, a manuscript should present significant progress in these topics. The novelty must be satisfactorily argued in the cover letter. A manuscript with a cover letter to the editor not addressing the novelty is likely to be rejected without review.