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<p>A SnS₂/SnO₂ heterojunction composite was successfully synthesized via a facile low-temperature solid-state reaction using novel tin hydroxychloride as the precursor and S powderas the reactant. Characterization results demonstrated that XRD patterns confirmed the coexistence of both SnS₂ and SnO₂ phases in all samples, with varying sulfur content showing no significant influence on their phase composition. HRTEM analysis clearly revealed well-bonded heterojunction interfaces between the two phases. N₂ adsorption-desorption measurements indicated the material possessed a moderate specific surface area of 59.50&#xa0;m²/g with a well-developed mesoporous structure. UV-Vis DRS spectra showed the composite had a tunable narrow band gap ranging from 1.93 to 2.08&#xa0;eV and enhanced visible-light absorption capability. XPS analysis further revealed the presence of trace Sn²⁺ defects and oxygen vacancies in the material. Photocatalytic performance tests showed that the samples exhibited excellent photocatalytic activity, with the optimized sample achieving complete degradation of methyl orange (MO) within 6&#xa0;min under visible-light irradiation, corresponding to a degradation rate constant of approximately 0.715&#xa0;min⁻¹. Free radical trapping experiments confirmed that superoxide radicals (•O₂⁻) and hydroxyl radicals (•OH) served as the primary active species in the degradation process, with the addition of their scavengers reducing the degradation efficiency to 11% and 44%, respectively. Based on these findings, a corresponding photocatalytic degradation mechanism was proposed.</p>

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Construction of SnS₂/SnO₂ hierarchical heterostructures based on solid-phase synthesis and their enhanced photocatalytic performance mechanism

  • 期刊论文

  • 发表日期：

    2026年3月31日

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  • Chong Wang,
  • Jieting Zhao,
  • Nan Wang,
  • Jingtao Wu,
  • Baoyan Liang

摘要

A SnS₂/SnO₂ heterojunction composite was successfully synthesized via a facile low-temperature solid-state reaction using novel tin hydroxychloride as the precursor and S powderas the reactant. Characterization results demonstrated that XRD patterns confirmed the coexistence of both SnS₂ and SnO₂ phases in all samples, with varying sulfur content showing no significant influence on their phase composition. HRTEM analysis clearly revealed well-bonded heterojunction interfaces between the two phases. N₂ adsorption-desorption measurements indicated the material possessed a moderate specific surface area of 59.50 m²/g with a well-developed mesoporous structure. UV-Vis DRS spectra showed the composite had a tunable narrow band gap ranging from 1.93 to 2.08 eV and enhanced visible-light absorption capability. XPS analysis further revealed the presence of trace Sn²⁺ defects and oxygen vacancies in the material. Photocatalytic performance tests showed that the samples exhibited excellent photocatalytic activity, with the optimized sample achieving complete degradation of methyl orange (MO) within 6 min under visible-light irradiation, corresponding to a degradation rate constant of approximately 0.715 min⁻¹. Free radical trapping experiments confirmed that superoxide radicals (•O₂⁻) and hydroxyl radicals (•OH) served as the primary active species in the degradation process, with the addition of their scavengers reducing the degradation efficiency to 11% and 44%, respectively. Based on these findings, a corresponding photocatalytic degradation mechanism was proposed.