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Combined effects of adsorption and photocatalysis by hybrid TiO2/ZnO-calcium alginate beads for the removal of copper.
J Environ Sci (China). 2017 May; 55:214-223.JE

Abstract

The use of nanosized titanium dioxide (TiO2) and zinc oxide (ZnO) in the suspension form during treatment makes the recovering and recycling of photocatalysts difficult. Hence, supported photocatalysts are preferred for practical water treatment applications. This study was conducted to investigate the efficiency of calcium alginate (CaAlg) beads that were immobilized with hybrid photocatalysts, TiO2/ZnO to form TiO2/ZnO-CaAlg. These immobilized beads, with three different mass ratios of TiO2:ZnO (1:1, 1:2, and 2:1) were used to remove Cu(II) in aqueous solutions in the presence of ultraviolet light. These beads were subjected to three cycles of photocatalytic treatment with different initial Cu(II) concentrations (10-80ppm). EDX spectra have confirmed the inclusion of Ti and Zn on the surface of the CaAlg beads. Meanwhile, the surface morphology of the beads as determined using SEM, has indicated differences of before and after the photocatalytic treatment of Cu(II). Among all three, the equivalent mass ratio TiO2/ZnO-CaAlg beads have shown the best performance in removing Cu(II) during all three recycling experiments. Those TiO2/ZnO-CaAlg beads have also shown consistent removal of Cu, ranging from 7.14-62.0ppm (first cycle) for initial concentrations of 10-80ppm. In comparison, bare CaAlg was only able to remove 6.9-48ppm of similar initial Cu concentrations. Thus, the potential use of TiO2/ZnO-CaAlg beads as environmentally friendly composite material can be further extended for heavy metal removal from contaminated water.

Authors+Show Affiliations

Department of Chemistry, Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia. Electronic address: kdevagi@unimas.my.Department of Chemistry, Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia.School of Chemistry and Environment, Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28477816

Citation

Kanakaraju, Devagi, et al. "Combined Effects of Adsorption and Photocatalysis By Hybrid TiO2/ZnO-calcium Alginate Beads for the Removal of Copper." Journal of Environmental Sciences (China), vol. 55, 2017, pp. 214-223.
Kanakaraju D, Ravichandar S, Lim YC. Combined effects of adsorption and photocatalysis by hybrid TiO2/ZnO-calcium alginate beads for the removal of copper. J Environ Sci (China). 2017;55:214-223.
Kanakaraju, D., Ravichandar, S., & Lim, Y. C. (2017). Combined effects of adsorption and photocatalysis by hybrid TiO2/ZnO-calcium alginate beads for the removal of copper. Journal of Environmental Sciences (China), 55, 214-223. https://doi.org/10.1016/j.jes.2016.05.043
Kanakaraju D, Ravichandar S, Lim YC. Combined Effects of Adsorption and Photocatalysis By Hybrid TiO2/ZnO-calcium Alginate Beads for the Removal of Copper. J Environ Sci (China). 2017;55:214-223. PubMed PMID: 28477816.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Combined effects of adsorption and photocatalysis by hybrid TiO2/ZnO-calcium alginate beads for the removal of copper. AU - Kanakaraju,Devagi, AU - Ravichandar,Shantini, AU - Lim,Ying Chin, Y1 - 2016/10/06/ PY - 2016/03/07/received PY - 2016/05/07/revised PY - 2016/05/16/accepted PY - 2017/5/8/entrez PY - 2017/5/10/pubmed PY - 2017/6/6/medline KW - Alginate KW - Heavy metals KW - Immobilization KW - Photocatalyst KW - Titanium dioxide KW - Zinc oxide SP - 214 EP - 223 JF - Journal of environmental sciences (China) JO - J Environ Sci (China) VL - 55 N2 - The use of nanosized titanium dioxide (TiO2) and zinc oxide (ZnO) in the suspension form during treatment makes the recovering and recycling of photocatalysts difficult. Hence, supported photocatalysts are preferred for practical water treatment applications. This study was conducted to investigate the efficiency of calcium alginate (CaAlg) beads that were immobilized with hybrid photocatalysts, TiO2/ZnO to form TiO2/ZnO-CaAlg. These immobilized beads, with three different mass ratios of TiO2:ZnO (1:1, 1:2, and 2:1) were used to remove Cu(II) in aqueous solutions in the presence of ultraviolet light. These beads were subjected to three cycles of photocatalytic treatment with different initial Cu(II) concentrations (10-80ppm). EDX spectra have confirmed the inclusion of Ti and Zn on the surface of the CaAlg beads. Meanwhile, the surface morphology of the beads as determined using SEM, has indicated differences of before and after the photocatalytic treatment of Cu(II). Among all three, the equivalent mass ratio TiO2/ZnO-CaAlg beads have shown the best performance in removing Cu(II) during all three recycling experiments. Those TiO2/ZnO-CaAlg beads have also shown consistent removal of Cu, ranging from 7.14-62.0ppm (first cycle) for initial concentrations of 10-80ppm. In comparison, bare CaAlg was only able to remove 6.9-48ppm of similar initial Cu concentrations. Thus, the potential use of TiO2/ZnO-CaAlg beads as environmentally friendly composite material can be further extended for heavy metal removal from contaminated water. SN - 1001-0742 UR - https://www.unboundmedicine.com/medline/citation/28477816/Combined_effects_of_adsorption_and_photocatalysis_by_hybrid_TiO2/ZnO_calcium_alginate_beads_for_the_removal_of_copper_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1001-0742(16)30442-9 DB - PRIME DP - Unbound Medicine ER -