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<p>In this study, SnO₂/SnS₂ heterojunctions were successfully constructed in situ via a low-temperature solid-phase method using synthesized tin oxide hydroxide sulfate precursors and thiourea as raw materials. During heating, the precursors progressively transformed into SnS₂/SnO₂ heterojunctions while retaining their agglomerated structure. The regulatory role of NH₄Cl additive in product phase formation was systematically investigated. Furthermore, the structure–property relationship between microstructure, optical characteristics, and photocatalytic performance of the composite was elucidated. Phase and microstructure characterization (XRD, SEM, TEM, XPS, Raman) confirmed that introducing NH₄Cl promoted the close integration of SnO₂ and SnS₂ phases and heterojunction formation through a chemical vapor transport mechanism. The composite exhibited a hierarchical nanostructure, suitable mesoporous characteristics, and significant interfacial electron interaction. UV–Vis absorption spectroscopy and photoluminescence analysis indicated that the heterojunction effectively broadened the light response range and facilitated the separation of photogenerated carriers. Photocatalytic degradation experiments of MO demonstrated that the as-prepared SnS₂/SnO₂ composites exhibited good performance under both UV and visible light. The optimized composite (S2) achieved complete degradation of MO within 6&#xa0;min under UV light and within 20&#xa0;min under visible light. Free-radical trapping experiments confirmed that superoxide radicals (•O₂⁻) and hydroxyl radicals played dominant roles in the photocatalytic process.</p>

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In situ fabrication of SnO2/SnS2 heterojunction derived from tin oxide hydroxide sulfate and its photocatalytic performance

  • 期刊论文

  • 发表日期：

    2026年3月4日

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  • JingXian Han,
  • Hao Chang,
  • CongChao Zhang,
  • BaoYan Liang,
  • JingTao Wu

摘要

In this study, SnO₂/SnS₂ heterojunctions were successfully constructed in situ via a low-temperature solid-phase method using synthesized tin oxide hydroxide sulfate precursors and thiourea as raw materials. During heating, the precursors progressively transformed into SnS₂/SnO₂ heterojunctions while retaining their agglomerated structure. The regulatory role of NH₄Cl additive in product phase formation was systematically investigated. Furthermore, the structure–property relationship between microstructure, optical characteristics, and photocatalytic performance of the composite was elucidated. Phase and microstructure characterization (XRD, SEM, TEM, XPS, Raman) confirmed that introducing NH₄Cl promoted the close integration of SnO₂ and SnS₂ phases and heterojunction formation through a chemical vapor transport mechanism. The composite exhibited a hierarchical nanostructure, suitable mesoporous characteristics, and significant interfacial electron interaction. UV–Vis absorption spectroscopy and photoluminescence analysis indicated that the heterojunction effectively broadened the light response range and facilitated the separation of photogenerated carriers. Photocatalytic degradation experiments of MO demonstrated that the as-prepared SnS₂/SnO₂ composites exhibited good performance under both UV and visible light. The optimized composite (S2) achieved complete degradation of MO within 6 min under UV light and within 20 min under visible light. Free-radical trapping experiments confirmed that superoxide radicals (•O₂⁻) and hydroxyl radicals played dominant roles in the photocatalytic process.