naa a22 4500 510752691 CHVBK 20180411083110.0 cr unu---uuuuu 180411e20131101xx s 000 0 eng 10.1007/s11270-013-1749-0 doi (NATIONALLICENCE)springer-10.1007/s11270-013-1749-0 Degradation of Humic Acid by Photocatalytic Reaction Using Nano-sized ZnO/Laponite Composite (NZLC) [Elektronische Daten] [Jong Kim, Jawaher Alajmy, Alisson Borges, Jin Joo, Hosang Ahn, Luiza Campos] Humic acids (HA) are known as the precursors of carcinogenic compounds formed by the disinfection of drinking water. While conventional treatments were found to be inefficient HA removal processes in drinking water, advanced oxidation processes have been proven to have a significant effect in the treatment of HA. The degradation of HA was investigated using nano-sized zinc oxide (ZnO)/laponite composite (NZLC). The reactions occurred in a UVC reactor by considering following variables: pH, initial HA concentration, catalyst loading, addition of hydrogen peroxide (H2O2), and catalyst reuse. Water samples containing HA were analysed by ultraviolet/visible spectrophotometer and high-performance size-exclusion chromatography. Initial HA concentrations were tested by the Langmuir-Hinshelwood model with k and K ads values, determined to be 0.126mg/L.min and 0.0257L/mg, respectively. The change in pH affected the HA degradation efficiency by the photocatalytic activity where it was higher under acidic conditions rather than alkaline ones. Optimal catalyst loading was proved to be a constrained factor in influencing the photocatalytic efficiency: the increase of catalyst concentration enhanced the HA decomposition efficiency up to an optimum value of 20g/L, where there was no further degradation with excess loading. The addition of H2O2 was investigated through homogenous and heterogeneous photocatalysis, and, heterogeneous photocatalysis showed higher removal efficiency due to the combined effect of both catalysts and H2O2. Finally, NZLC was effective for reuse and exhibited an excellent stability after six times of usage. Springer Science+Business Media Dordrecht, 2013 Nano-ZnO/laponite composites nationallicence Photocatalysis nationallicence Adsorption nationallicence Humic acid nationallicence Kim Jong Department of Civil, Environmental, and Geomatic Engineering, University College London, London, UK aut Alajmy Jawaher Department of Civil, Environmental, and Geomatic Engineering, University College London, London, UK aut Borges Alisson Department of Agricultural Engineering, Federal University of Viçosa, Viçosa, Brazil aut Joo Jin Water Resource and Environment Research Department, Korea Institute of Construction Technology, Goyang-si, South Korea aut Ahn Hosang Water Resource and Environment Research Department, Korea Institute of Construction Technology, Goyang-si, South Korea aut Campos Luiza Department of Civil, Environmental, and Geomatic Engineering, University College London, London, UK aut Water, Air, & Soil Pollution Springer Netherlands 224/11(2013-11-01), 1-10 0049-6979 224:11<1 2013 224 11270 https://doi.org/10.1007/s11270-013-1749-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11270-013-1749-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kim Jong Department of Civil, Environmental, and Geomatic Engineering, University College London, London, UK aut NATIONALLICENCE 700 1- Alajmy Jawaher Department of Civil, Environmental, and Geomatic Engineering, University College London, London, UK aut NATIONALLICENCE 700 1- Borges Alisson Department of Agricultural Engineering, Federal University of Viçosa, Viçosa, Brazil aut NATIONALLICENCE 700 1- Joo Jin Water Resource and Environment Research Department, Korea Institute of Construction Technology, Goyang-si, South Korea aut NATIONALLICENCE 700 1- Ahn Hosang Water Resource and Environment Research Department, Korea Institute of Construction Technology, Goyang-si, South Korea aut NATIONALLICENCE 700 1- Campos Luiza Department of Civil, Environmental, and Geomatic Engineering, University College London, London, UK aut NATIONALLICENCE 773 0- Water, Air, & Soil Pollution Springer Netherlands 224/11(2013-11-01), 1-10 0049-6979 224:11<1 2013 224 11270 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer