Photocatalytic technology can provide a clean, low-cost and highly efficient path to approach the degradation of azo dyes. Tetragonal β-In₂S₃ possesses plenty of vacancies, furnishing dopants with abundant interspace, and can be used as a potential photocatalyst for dyes degradation. In this work, Ca was doped into β-In₂S₃ via a facile one-pot hydrothermal method, which was mainly doped into the crystalline lattices of β-In₂S₃. Ca doped β-In₂S₃ revealed better photo-degradation of Methyl Orange (MO) than undoped β-In₂S₃. The doped Ca ions narrowed band gap and acted as a charge transfer medium, leading to the wider light absorption range and smaller photogenerated charge transfer resistance, respectively. The optimum preparation condition of Ca doped β-In₂S₃ was determined as holding temperature at 120 °C for 8 h, by which 94.97% of MO was degraded in 20 mins under visible light. The outstanding performance could be owed to the full-grown flaky structure with maximal specific surface area. Based on the experimental results, a possible photocatalytic mechanism for MO degradation over Ca doped β-In₂S₃ was proposed.

光催化技术可以提供一种清洁、低成本和高效的途径来处理偶氮染料的降解。四方β-In ₂ S ₃具有大量空位，为掺杂剂提供了丰富的间隙，可用作染料降解的潜在光催化剂。在这项工作中，Ca通过简便的一锅水热法掺杂到 β-In ₂ S _{3 中}，主要掺杂到 β-In ₂ S _{3 的}晶格中。Ca掺杂的β-In ₂ S ₃显示出比未掺杂的β-In ₂ S ₃更好的甲基橙（MO）光降解. 掺杂的 Ca 离子使带隙变窄并充当电荷转移介质，分别导致更宽的光吸收范围和更小的光生电荷转移电阻。Ca掺杂β-In ₂ S ₃的最佳制备条件为120℃保温8小时，可见光下20分钟降解94.97%的MO。优异的性能可能归功于具有最大比表面积的完全生长的片状结构。基于实验结果，提出了Ca掺杂的β-In ₂ S _{3 上}MO降解的可能光催化机制。