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Photocatalytic degradation of the diazo dye naphthol blue black in water using MWCNT/Gd,N,S-TiO_2 nanocomposites under simulated solar light

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Journal of Environmental Sciences 2015年第7期27卷 219-228页

作者： Gcina Mamba xavier yangkou mbianda Ajay Kumar Mishra Department of Applied Chemistry University of Johannesburg Faculty of Science DST-NRF Centre of Excellence in Strong Materials School of Physics University of the Witwatersrand Nanotechnology and Water Sustainability Unit College of Engineering Science and Technology University of South Africa Florida Campus

A simple sol-gel method was employed to prepare gadolinium, nitrogen and sulphur tridoped titania decorated on oxidised multiwalled carbon nanotubes（MWCNT/Gd,N,S-Ti O2）, using titanium（IV） butoxide and thiourea as titanium and nitrogen and sulphur source, respectively. Samples of varying gadolinium loadings（0.2%, 0.6%, 1.0% and3.0% Gd3＋） relative to titania were prepared to investigate the effect of gadolinium loading and the amounts of carbon nanotubes, nitrogen and sulphur were kept constant for all the samples. Furthermore, the prepared nanocomposites were evaluated for the degradation of naphthol blue black（NBB） in water under simulated solar light irradiation. Higher degradation efficiency（95.7%） was recorded for the MWCNT/Gd,N,S-Ti O2（0.6% Gd）nanocomposites. The higher photocatalytic activity is attributed to the combined effect of improved visible light absorption and charge separation due to the synergistic effect of Gd,MWCNTs, N, S and Ti O2. Total organic carbon（TOC） analysis revealed a higher degree of complete mineralisation of naphthol blue black（78.0% TOC removal） which minimises the possible formation of toxic degradation by-products such as the aromatic amines. The MWCNT/Gd,N,S-Ti O2（0.6% Gd） was fairly stable and could be re-used for five times,reaching a maximum degradation efficiency of 91.8% after the five cycles.

关键词： Gadolinium MWCNTs NBB Simulated solar light Tridoped titania

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Phosphine functionalised multiwalled carbon nanotubes:A new adsorbent for the removal of nickel from aqueous solution

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Journal of Environmental Sciences 2012年第6期24卷 1133-1141页

作者： Muleja Anga Adolph yangkou mbianda xavier Pillay Kriveshini Krause Rui Department of Chemical Technology University of JohannesburgDoornfontein Campus P.O Box 17011JohannesburgSouth Africa

Synthesised triphenylphosphine-linked multiwalled carbon nanotubes （Tpp-MWCNTs） were used to study the adsorption of nickel in aqueous solutions and their adsorption capabilities were compared with purified *** adsorption capacity increased with an increase in pH for all *** adsorption equilibrium was reached in 40 and 30 min for purified MWCNTs and Tpp-MWCNTs,*** Freundlich and Langmuir isotherms used to investigate the adsorption process fitted the experimental data well with the correlation coefficient R 2 close to 1 for all *** the other hand,the experimental data fitted well with a pseudo secondorder *** speciation of nickel also influenced the adsorption on the purified and *** adsorbents used in this study showed superior adsorption capacity when compared to other adsorbents reported in the literature.

关键词： phosphine functionalised multiwalled carbon nanotubes adsorbent XPS remediation nickel

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