Department of Physics, Nehru Memorial College, Affiliated to Bharathidasan University, Puthanampatti, 621007, Tamil Nadu, India.
Environmental Science and Engineering Laboratory, Department of Civil Engineering, Yeungnam University, Geongsan, 38541, Republic of Korea.
Environ Res. 2022 Jun;209:112819. doi: 10.1016/j.envres.2022.112819. Epub 2022 Jan 25.
In this work, the Ag modified ZnS nanoparticles were synthesized via the hydrothermal method, and used for photocatalytic degradation of organic dyes. Various analytical techniques were utilized to characterize the prepared ZnS and Ag incorporated ZnS nanoparticles. The vibrational and structural properties of the prepared nanoparticles were analyzed by FT-IR and XRD, which confirm the modification of Ag in the ZnS. The broadening of the hydroxyl group after incorporation of Ag in ZnS was observed in the FT-IR spectra. The additional (111), (200), and (220) planes in XRD of Ag-ZnS belong to the silver. The increased absorbance in the entire visible region facilitates the ZnS/Ag photocatalytic performance under direct sunlight. ZnS/Ag nanoparticles showed excellent photocatalytic activity toward degradation of RR 120, DB 15, and AB 1. The ZnS/Ag catalyst efficiently degrades the RR 120 under sunlight with higher pseudo-first order kinetic k = 0.0179 min than the other dyes. The reusability study exhibited ZnS/Ag has highly stable and degraded more than 80% of RR 120 under sunlight irradiation after 4th cycle.
在这项工作中，通过水热法合成了 Ag 修饰的 ZnS 纳米粒子，并将其用于有机染料的光催化降解。利用各种分析技术对制备的 ZnS 和掺入 Ag 的 ZnS 纳米粒子进行了表征。通过 FT-IR 和 XRD 分析了制备的纳米粒子的振动和结构特性，证实了 Ag 在 ZnS 中的修饰。在 FT-IR 光谱中观察到 Ag 掺入 ZnS 后羟基的展宽。Ag-ZnS 的 XRD 中出现的附加（111）、（200）和（220）面属于银。在整个可见光区域吸收的增加有利于 ZnS/Ag 在阳光直射下的光催化性能。ZnS/Ag 纳米粒子对 RR 120、DB 15 和 AB 1 的降解表现出优异的光催化活性。ZnS/Ag 催化剂在阳光下对 RR 120 的降解具有较高的拟一级动力学常数 k = 0.0179 min-1，优于其他染料。在第 4 次循环后，在阳光照射下，ZnS/Ag 的重复使用研究表明具有高度稳定性，可降解超过 80%的 RR 120。
