Fatima Sabeen, Rizwan Syed
Physics Characterization and Simulations Lab (PCSL), Department of Physics, School of Natural Sciences (SNS), National University of Sciences and Technology (NUST), Islamabad, 54000, Pakistan.
ACS Omega. 2023 Jan 18;8(4):3736-3744. doi: 10.1021/acsomega.2c04971. eCollection 2023 Jan 31.
Because of a rapidly growing need for water, it is essential to find new fast and reliable ways of water purification from organic pollutants. For removing organic azo dyes from water, various catalysts and photocatalysts have been designed to meet crucial water needs. In this study tin (Sn) doped bismuth ferrite (BFO) nanoparticles have been synthesized using the sol-gel technique. Further, BFSO/GNP nanohybrids were synthesized by mixing BFSO nanoparticles with graphene nanoplatelets (GNPs) via a simple and cost effective coprecipitation process. XRD and SEM showed that BFSO/GNP nanohybrids are well grown in crystal structure along with uniform and homogeneous morphology. XPS supported the elemental composition and interface bonding of both materials present inside the nanohybrids. DRS and catalytic activities showed that BFSO/GNP nanohybrids are both dark and light active species for performing dye degradation activities during water purification. The as-synthesized nanohybrids provided efficient dye removal from water even in the absence of light owing to the presence of defects and trap-state carriers (electrons) inside the graphene sheets. The optimized nanohybrid BFSO-15/GNP showed 100% dye removal in 60 min with 90% catalytic activity under dark. The recyclability test showed stable and repeatable performance of BFSO/GNP nanohybrids up to 10 cycles of catalytic activities.
由于对水的需求迅速增长，找到从有机污染物中快速可靠地净化水的新方法至关重要。为了从水中去除有机偶氮染料，人们设计了各种催化剂和光催化剂来满足关键的水需求。在本研究中，采用溶胶-凝胶技术合成了锡（Sn）掺杂的铋铁氧体（BFO）纳米颗粒。此外，通过简单且经济高效的共沉淀过程将BFSO纳米颗粒与石墨烯纳米片（GNP）混合，合成了BFSO/GNP纳米杂化物。XRD和SEM表明，BFSO/GNP纳米杂化物的晶体结构生长良好，形态均匀且同质。XPS支持了纳米杂化物中两种材料的元素组成和界面键合。DRS和催化活性表明，BFSO/GNP纳米杂化物在水净化过程中对于进行染料降解活性既是暗活性物种也是光活性物种。由于石墨烯片内部存在缺陷和陷阱态载流子（电子），所合成的纳米杂化物即使在没有光的情况下也能有效地从水中去除染料。优化后的纳米杂化物BFSO-15/GNP在黑暗条件下60分钟内实现了100%的染料去除率，催化活性为90%。循环利用测试表明，BFSO/GNP纳米杂化物在高达10个催化活性循环中表现出稳定且可重复的性能。
