Enhanced photocatalytic degradation of dyes using a novel waste tonerbased TiO_(2)/Fe_(2)O_(3)@nanographite nanohybrid:A sustainable approach  

作　　者：Kenneth Mensah Hassan Shokry Marwa Elkady Hamada BHawash Mahmoud Samy 

机构地区：[1]Department of Civil and Environmental Engineering,University of Maine,Orono,ME 04469,USA [2]Environmental Engineering Department,Egypt-Japan University of Science and Technology,New Borg El-Arab City,Alexandria 21934,Egypt [3]Chemical and Petrochemical Engineering Department,Egypt-Japan University of Science and Technology,New Borg El Arab City,Alexandria 21934,Egypt [4]Environmental Division,National Institute of Oceanography and Fisheries,Cairo 11516,Egypt [5]Public Works Engineering Department,Faculty of Engineering,Mansoura University,Mansoura 35516,Egypt

出　　处：《Water Science and Engineering》2024年第3期226-235,共10页水科学与水工程(英文版)

基　　金：supported by the Faculty of Engineering,Mansoura University.

摘　　要：This study synthesized a ferric oxide-nanographite(NG)nanocomposite(Fe_(2)O_(3)@NG)from waste toner powder through carbonization.Subsequently,a TiO_(2)/Fe_(2)O_(3)@NG nanohybrid was fabricated using the sol-gel technique to improve the photocatalytic degradation of dyes.TiO_(2)/Fe_(2)O_(3)@NG nanocomposites were prepared at TiO_(2):Fe_(2)O_(3)@NG ratios of 2:1(Ti:T-21),1:1(Ti:T-11),and 1:2(Ti:T-12).The porosity,morphology,surface chemistry,and chemical interactions between TiO_(2),Fe_(2)O_(3),and graphite in the prepared TiO_(2)/Fe_(2)O_(3)@NG nanocomposites were characterized using the Brunauer-Emmett-Teller(BET)method and microscopic and spectroscopic analyses.The TiO_(2)/Fe_(2)O_(3)@NG nanohybrid exhibited a reduced bandgap(2.4-2.9 eV)and enhanced charge carrier separation through charge transfer at the junction of the hetero-structured TiO_(2)/Fe_(2)O_(3)@NG nanohybrid.Preliminary experiments revealed that Ti:T-21 was the most effective photocatalyst for degrading acid blue-25(AB-25)compared to Ti:T-11,Ti:T-12,sole TiO_(2),and Fe_(2)O_(3)@NG.This study also investigated the impacts of catalyst dose and initial dye concentration on the AB-25 photocatalytic degradation.Notably,97%of 5-mg/L AB-25 was removed using 1.25-g/L Ti:T-21 at an unmodified pH of 6.4 within 120 min.Furthermore,Ti:T-21 exhibited remarkable recyclability in its immobilized form,achieving degradation ratios of 74.7%-71.8%over five consecutive runs,compared to removal efficiencies of 85.0%e62.3%in the suspended mode.Trapping experiments identified hydroxyl radicals,holes,and superoxide as the principal reactive radicals.The TiO_(2)/Fe_(2)O_(3)@NG/light system was effective in disintegrating and mineralizing other synthetic dyes such as Congo red,methylene blue,and methyl red,indicating its potential for industrial-scale degradation of authentic dye wastewater.The utilization of waste toner for water treatment is highlighted as a strategy to promote environmental sustainability,foster a circular economy,and contribute to pollution remediation.

关 键 词：Advanced oxidation Circular economy HETEROJUNCTIONS Photocatalysis Pollution remediation Degradation mechanism 

分 类 号：TB3[一般工业技术—材料科学与工程]