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Increased photo-catalytic removal of sulfur using titania/MWCNT composite

Journal of Central South University 2016年第5期23卷 1066-1070页

作者： molood barmala Abdolsamad Zarringhalam Moghadam Mohammad Reza Omidkhah Chemical Engineering Department Tarbiat Modares UniversityJalal Ale Ahmad Highway

Titania coating of multi wall carbon nano tube(MWCNT) was carried out by sol-gel method in order to improve its photo catalytic *** effect of MWCNT/TiO_2 mass to volume ratio on adsorption ability,reaction rate and photo-catalytic removal efficiency of dibenzothiophene(DBT) from n-hexane solution was investigated using a 9 W UV *** results show that the addition of nanotubes improves the photo-catalytic properties of TiO_2 by two factors;however,the DBT removal rate versus MWCNT content is found to follow a bimodal *** factors are observed to affect the removal rate of DBT and produce two optimum values for MWCNT ***,large quantities of MWCNTs prevent light absorption by the solution and decrease removal *** contrast,a low dosage of MWCNT causes recombination of the electron holes,which also decreases the DBT removal *** optimum MWCNT contents in the composite are found to be 0.25 g and 0.75 g MWCNT per 80 m L of sol.

关键词： photo oxidation desulfurization sol-gel titania multi wall carbon nano tube (MWCNT)

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Photo oxidation of DBT using carbon nanotube titania composite as visible light active photo catalyst

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Journal of Central South University 2018年第7期25卷 1642-1650页

作者： barmala molood BEHNOOD Mohammad OMIDKHAH Mohammad Reza Chemical Engineering Department Dezful BranchIslamic Azad University Department of Petroleum and Chemical Engineering Science and Research BranchIslamic Azad University Chemical Engineering Department Tarbiat Modares University

Sulfur removal from liquid fuels has increased in importance in recent years. Although hydrodesulfurization is the usual method for removing sulfur, the elimination of thiophene compounds using this process is difficult. Photocatalysis is an alternative method being developed for thiophene removal at ambient conditions. Among semiconductors, titania has shown good potential as a photo-catalyst; however, quick recombination of electron holes hinders its commercial use. One way to decrease the recombination rate is to combine carbon nanotubes with a semiconductor. In this work, multiwall carbon nanotube （MWCNT） / titania composites were prepared with different mass ratios of MWCNT to titania using tetraethyl orthotitanate （TEOT） and titanium tetra isopropoxide （TTIP） as precursors of titania. Dibenzothiophene （DBT） photocatalytic removal from n-hexane was measured in both the presence and absence of oxygen. The results indicated that the best removal occurred when the MWCNT to titania ratio was 1. When the ratio exceeded this number, DBT removal efficiency decreased due to light scattering. Also, the composites prepared by TEOT exhibited better efficiency in DBT removal. The research findings suggested that the obtained composite was a visible light active photocatalyst and exhibited better performance in the presence of oxygen. Kinetics of photocatalytic DBT removal was a first-order reaction with removal rate constant 0.7 h–1 obtained at optimum conditions.

关键词： advanced oxidation processes carbon nanotube photocatalysis UV kinetics semiconductor sol-gel process

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