Photocatalytic degradation of broadband antibiotics like tetracycline (TC) under visible-light irradiation is considered as an efficient and cost-effective protocol for eliminating it from the aqueous medium. In this study, highly efficient solution-processable Cd_1−xZn_xS photocatalysts were synthesized using a simple solvothermal route where zinc acetate and cadmium acetate were used as precursors. Composition-tunable alloyed nanorods with bandgap energy tunability ranging from UV (3.7 eV) to Vis (2.5 eV) were synthesized and structural and optical characterization was performed thoroughly. With the increase of Zn content in the Cd_1−xZn_xS crystal, the 1LO phonon shifts notably towards higher wavenumber. The performance of Cd_1−xZn_xS nanorod photocatalyst is strongly related to the ratio of Cd and Zn. The Cd_0.75Zn_0.25S sample exhibits the highest photocatalytic degradation rate constant compared to the other family members. The scavenger experiment revealed that the holes are the main responsible species, whereas hydroxyl radicals have weak roles and electrons have mild effects for the photocatalytic degradation of TC. Our study gives new insight towards the designing of ternary photocatalytic materials for efficient removal of antibiotics from aqueous solution.

宽带抗生素如四环素（TC）在可见光照射下的光催化降解被认为是从水性介质中消除它的有效且具有成本效益的方案。在这项研究中，使用乙酸锌和乙酸镉作为前体的简单溶剂热途径合成了高效的可溶液处理的Cd ₁ - _x Zn _x S光催化剂。合成了能带隙能量可调范围从UV（3.7 eV）到Vis（2.5 eV）的组成可调合金纳米棒，并进行了结构和光学表征。随着Cd _{1− x} Zn _x中Zn含量的增加对于S晶体，1LO声子向较高波数方向明显偏移。Cd _{1- x} Zn _x S纳米棒光催化剂的性能与Cd和Zn的比例密切相关。与其他家族成员相比，Cd _0.75 Zn _0.25 S样品表现出最高的光催化降解速率常数。清除剂实验表明，空穴是主要负责的物种，而羟基自由基的作用较弱，电子对TC的光催化降解作用较小。我们的研究为有效地从水溶液中去除抗生素的三元光催化材料的设计提供了新的见识。