The speedy recombination of photoelectrons and holes is a frustrating issue in photocatalysis. Delicate design and simple synthesis of heteroarchitectures by tightly integrating two or more nanosemiconductors with well-matched electronic and geometrical structure is an effective strategy to improve the light-absorption and charge-separation. A novel MnIn₂S₄/In(OH)₃ type-II heterojuncture with compact contact is fabricated firstly by in-situ growth of MnIn₂S₄ nanosheets onto In(OH)₃ surface via an one-pot hydrothermal synthesis. Benefiting from the increased specific surface area, visible-light absorption and charge-separation due to the formation of nano-heterojunctions among the ingredients, MnIn₂S₄/In(OH)₃ heterostructures demonstrate extraordinarily improved photocatalytic performance for MB degradation and Cr(VI) reduction relative to its single counterparts. The optimal MnIn₂S₄/In(OH)₃ (R = 6) manifests a removal percentage of MB (93.9%) and Cr(VI) (97.2%) under visible light illumination. Based on the band-structure analyses, PL, TPC, EIS measurements as well as the predominating active species trapping/detecting experiments, the charge-transfer pathways for MB degradation and Cr(VI) reduction over MnIn₂S₄/In(OH)₃ heterostructures are proposed. This work offers an eco-friendly, viable pathway for in-situ growth of heterostructured photocatalysts with good performance for removing recalcitrant substances in environmental rectification.

光电子和空穴的快速复合是光催化中令人沮丧的问题。通过紧密集成两个或多个具有良好匹配的电子和几何结构的纳米半导体来进行异质结构的精细设计和简单合成是改善光吸收和电荷分离的有效策略。_{首先通过在In(OH) 3}上原位生长MnIn ₂ S ₄纳米片制备具有紧密接触的新型MnIn ₂ S ₄ /In(OH) _{3 II型异质结}表面通过一锅水热合成。_{MnIn 2} S ₄ /In(OH) ₃异质结构由于成分之间形成纳米异质结而增加了比表面积、可见光吸收和电荷分离，因此对 MB 降解和 Cr( VI) 相对于其单一对应物的减少。最佳MnIn ₂ S ₄ /In(OH) ₃(R = 6) 在可见光照射下显示出 MB (93.9%) 和 Cr(VI) (97.2%) 的去除百分比。基于能带结构分析、PL、TPC、EIS 测量以及主要的活性物质捕获/检测实验，MB 降解和 Cr(VI) 在 MnIn ₂ S ₄ /In(OH)上还原的电荷转移途径提出了₃种异质结构。这项工作为异质结构光催化剂的原位生长提供了一条生态友好、可行的途径，在环境整改中具有良好的去除顽固物质的性能。