Novel insights into the properties of AgBiO3 photocatalyst and its application in immobilized state for 4-nitrophenol degradation and bacteria inactivation
Novel insights into the properties of AgBiO3 photocatalyst and its application in immobilized state for 4-nitrophenol degradation and bacteria inactivation
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DOI：
10.1016/j.jphotochem.2018.11.001
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发表时间：
2019-03-15
影响因子：
4.3
通讯作者：
Madras, Giridhar
中科院分区：
文献类型：
--
作者：
Boruah, Bhanupriya;Gupta, Rimzhim;Madras, Giridhar
本文主要研究了水热法制备新型AgBiO3纳米颗粒，并对其用于废水处理的性能进行了研究。通过XRD测定，水热反应温度和时间分别为150℃和24 h，可获得高活性的纳米颗粒晶体。通过XPS分析确定了材料中各元素的氧化态。通过扫描电镜和透射电镜分析了纳米颗粒的形貌和尺寸。通过UPS和Mott Schottky图研究了材料的光学和电化学性质。通过Tauc图和UV-vis DRS分析，发现AgBiO3具有较低的带隙，有利于更高波长范围的吸收。动力学研究和稳定性试验证实了该固定化材料对4-硝基苯酚的降解和e - coil的失活具有良好的光催化活性。4-NP的最大降解率为90%，活的大肠杆菌细胞在5小时和1小时内降解率分别为5对数。进行了清除率研究，以确定超氧自由基对材料的光催化活性负责。为了减少分离成本和便于材料的重复使用，纳米颗粒被固定在醋酸纤维素上。通过ICP-MS分析，获得了固定和游离AgBiO3纳米颗粒中Ag和Bi离子的浸出。结果表明，由于醋酸纤维素基质的固定作用，在很大程度上控制了银和铋的浸出。
This study focuses on the synthesis of novel AgBiO3 nanoparticles by the hydrothermal route and investigating its properties responsible for waste water treatment. The temperature and time of hydrothermal reaction was optimized to 150 degrees C and 24 h to obtain highly active crystalline nanoparticles, as determined by XRD. The oxidation state of each element in the material was determined from XPS analysis. The morphology and size of the nanoparticles was obtained from SEM and TEM analysis. The optical and electrochemical properties of the material were studied by UPS and Mott Schottky plot. AgBiO3 was found to have a low band gap that facilitates the absorption of higher wavelength range as confirmed by Tauc plots and UV-vis DRS analysis. The excellent photocatalytic activity of the immobilized material towards the degradation of 4-nitrophenol and inactivation of E. coil was confirmed from kinetic studies and stability tests. A maximum degradation of 90% was achieved for 4-NP and a 5-log reduction was observed for viable E. coli cells in 5 h and 1 h respectively. Scavenger studies were performed to identify that superoxide radicals were responsible for the photocatalytic activity of the material. To eliminate the cost of separation and ease the reusability of the material, the nanoparticles were immobilized on cellulose acetate. Leaching of Ag and Bi ions from immobilized as well as free AgBiO3 nanoparticles into water was obtained via ICP-MS analysis. The results indicated that the leaching of Ag and Bi was controlled to a considerable extent due to immobilization on cellulose acetate matrix.