School of Nano Sciences, Central University of Gujarat, Gandhinagar, Gujarat, 382030, India.
Dr BR Ambedkar National Institute of Technology, Jalandhar, Punjab, India.
Environ Sci Pollut Res Int. 2021 Sep;28(34):46390-46403. doi: 10.1007/s11356-020-10982-y. Epub 2020 Oct 3.
The industrialization, growing population, and human activities (e.g., liquid waste of households, industrial units, and agricultural lands) are the main causes to contaminate fresh water sources. To overcome this issue, many techniques have been applied for water purification and chemical oxidation is one of the effective ways to treat the wastewater called as advanced oxidation process (AOPs). In the present study, synthesized silver phosphate nanoparticles were employed as catalysts in the photocatalytic advanced oxidation process for the degradation of various dyes (RhB, MB, MO, and OG) and drug (SMZ). The photocatalyst was characterized through different analytical tools, e.g., PXRD, FTIR, UV-Vis DRS, DLS, FESEM, and HRTEM. The chemical behavior or interaction of dye molecule with catalyst surface has also been explored to understand the mechanism of photodegradation reaction. All the organic dyes and drugs showed pseudo first-order rate kinetics and it was found that RhB dye and SMZ drug degraded so fast by the photocatalyst. The maximum observed photodegradation rate was 0.0744 min for SMZ drug and 0.0532 min for RhB dye, respectively. The minimum dye degradation was observed ~ 0.0036 min for OG, which is ~ 15 times lesser than the degradation rate of RhB dye. From the comparative dye degradation study, it was found that the photodegradation efficiency of organic pollutants depends on the surface charge of the photocatalyst. The role of photogenerated reactive species (holes, superoxides, and hydroxyl free radicals) was also studied using different types of scavengers which helped to understand the photochemical reactions and mechanism by photocatalyst. The real sample analysis of textile effluent was also performed using the best photocatalyst in the presence of light.
工业化、人口增长和人类活动（例如，家庭、工业单位和农田的液体废物）是污染淡水资源的主要原因。为了解决这个问题，已经应用了许多技术来进行水净化，而化学氧化是处理废水的有效方法之一，称为高级氧化工艺（AOPs）。在本研究中，合成的磷酸银纳米粒子被用作光催化高级氧化工艺中的催化剂，用于降解各种染料（RhB、MB、MO 和 OG）和药物（SMZ）。通过不同的分析工具，例如 PXRD、FTIR、UV-Vis DRS、DLS、FESEM 和 HRTEM，对催化剂进行了表征。还探讨了染料分子与催化剂表面的化学行为或相互作用，以了解光降解反应的机理。所有有机染料和药物均表现出准一级动力学，并且发现 RhB 染料和 SMZ 药物通过光催化剂快速降解。观察到 SMZ 药物的最大光降解速率为 0.0744 min，RhB 染料的最大光降解速率为 0.0532 min。观察到 OG 的最小染料降解约为 0.0036 min，这比 RhB 染料的降解速率低约 15 倍。通过比较染料降解研究，发现有机污染物的光降解效率取决于光催化剂的表面电荷。还使用不同类型的猝灭剂研究了光生活性物质（空穴、超氧化物和羟基自由基）的作用，这有助于了解光催化剂的光化学反应和机理。还在存在光的情况下，使用最佳光催化剂对纺织废水的实际样品进行了分析。
