Photocatalytic effect of TiO2 and the effect of dopants on degradation of brilliant green

Sustainable Chemical Processes

Shamalah Munusamy¹  Rangabhatla sai laxmi Aparna²  Rangabhatla gunneswara subramanya vara Prasad² 

[1] Faculty of science, Technology and engineering La’ Trobe University, Bendigo, Victoria 3552, Australia

[2] School of Pharmacy, Masterskill University College of Health Science, Kualalumpur, 43200, Malaysia

关键词: Photocatalysis;    Brilliant green;    UV irradiation;    TiO2;    Dopant;   

Others  :  790841
DOI  :  10.1186/2043-7129-1-4

 received in 2013-02-14, accepted in 2013-04-18,  发布年份 2013

【 摘 要 】

Photocatalysis speeds up the photoreaction in the presence of a catalyst. TiO₂ has low toxicity, less resistance and less corrosion and has semiconductor properties. Its strong oxidative potential of the positive holes oxidizes water to create hydroxyl radicals. Moreover, TiO₂ has been proven to be a tremendous photocatalyst compound by which many organic substrates have been shown to be oxidatively degraded under UV irradiation. In this research the photocatalytic effect of TiO₂ on degradation of Brilliant Green (BG) was studied. In conjunction the effect of dopants such as Zn and Cu on photocatalysis of TiO₂ were also studied. Structural and morphological properties of TiO₂ were characterized by SEM and XRD. From this research the initial concentration of sample, pH of samples, chemical structure of dyes and catalyst loading were most valuable parameters for dye degradation. TiO₂ showed excellent result on degradation of BG compared with doped TiO₂. 99% degradation was obtained in presence of TiO₂, followed by TiO₂/Zn for 87% and TiO₂/Cu for 46%. TiO₂ doped with transition metals can increase or decrease photocatalytic degradation of dyes.

【 授权许可】

   
2013 Munusamy et al.; licensee Chemistry Central Ltd.

【 图 表 】

Figure 4.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Figure 7.

【 参考文献 】

• [1]Mekkawy HA, Ali MO, El-Zawahry AM: Toxic effect of synthetic and natural food dyes on renal and hepatic functions in rats. Toxicol Lett 1998, 95:155.
• [2]Song YL, Tai J, Bai B: TiO2-Assisted photodegradation of direct blue 78 in aqueous solution in sunlight. Water Air Soil Pollu 2010, 213:311.
• [3]Wang S: Oxidative degradation of dyes in water using Co2+/H2O2 and Co2+/peroxymonosulfate. Dyes Pigments 2008, 76:714.
• [4]Khehra MS, Saini HS, Sharma DK, Chadha BS, Chimni SS: Comparative studies on potential of consortium and constituent pure bacterial isolates to decolorize azo dyes. Water Res 2005, 39:5135.
• [5]Couto SR: Decolouration of industrial azo dyes by crude laccase from Trametes hirsute. J Hazard Mater 2007, 148:768.
• [6]Elizalde-Gonzailez MP, Pelaiez-Cid AA: Removal of textile dyes from aqueous solutions by adsorption on biodegradable wastes. Environ Technol 2003, 24:821.
• [7]Doll TE, Frimmel FH: Removal of selected persistent organic pollutants by heterogeneous photocatalysis in water. Catal Today 2005, 101:195.
• [8]Tsai WT, Lee MK, Su TY, Chang YM: Photodegradation of bisphenol- A in a batch TiO2 suspension reactor. J Hazard Mater 2009, 168:269.
• [9]Hoffmann MF, Martin ST, Choi W: Environmental application of semiconductor photocatalysis. J Chem Rev 1995, 95:69.
• [10]Tong T, Zhang J, Tian B, Chen F, He H: Preparation of Fe3+−doped TiO2 catalysts by controlled hydrolysis of titanium alkoxide and study on their photocatalytic activity for methyl orange degradation. J Hazard Mater 2008, 155:572.
• [11]The CM, Mohamed AR: Role of Titanium Dioxideand ion-doped Titanium dioxide on photocatalytic degradation of organic pollutants (phenolic compounds and dyes)-A Review. J Alloy Compd 2011, 509:1648.
• [12]Vachálková A, Novotný L, Blesová M: Polarographic reduction of some triphenylmethane dyes and their potential carcinogenic activity. Neoplasma 1996, 43:113.
• [13]Fox M, Dulay M: Heterogenous photocatalysis. Chem Re 1993, 93:341-357.
• [14]Sayılkan F, Asilt¨urk M, Tatar P, Kiraz N, Arpac E, Sayılkan H: Photo-catalytic performance of Sn-doped TiO2 nanostructured mono and double layer thin films for Malachite Green dye degradation under UV and vis- lights. J Hazard Mater 2007, 144:140-146.
• [15]Rahman MA, Muneer M: Photodegradation of norfloxacin in aqueous suspensions of titanium dioxide. J Environ Sci Health 2005, 40:247.
• [16]Gnaser H, Huber B, Ziegler C: Encycl. Nanosci. Nanotechnol. Vol.6 edition. Edited by Nalwa HS. Los Angeles: American Scientific Publishers; 2004:505-535.
• [17]Sohrabi MR, Ghavami M: Photocatalytic degradation of Direct Red 23 dye using UV/TiO2: Effect of operational parameters. J Hazard Mater 2008, 153:1235.
• [18]Concalves MST, Oliveira-Campos AMF, Pinto MMS, Plasencia PMS, Queiroz MJRP: Chemosphere. 1991, 39:781.
• [19]Barakat MA, Schaeffer H, Hayes G, Ismat-Shah S: Photocatalytic … Metal ions in photocatalytic systems. Appl. Catal. B Environ 2004, 57:23.
• [20]Pouretedal H, Norozi A, Keshavarz MH, Semnani A: Nanoparticles of zinc sulfide doped with manganese, nickel and copper as nanophotocatalyst in the degradation of organic dyes. J Hazard Mater 2009, 162:674.
• [21]Akpan UG, Hameed BH: Parameters affecting the photocatalytic degradation of dyes using TiO2-based photocatalysts: a review. J Hazard Mater 2009, 170:520.
• [22]Chiang K, Amal R, Tran T: Photocatalytic degradation of cyanide using titanium dioxide modified with copper oxide. Adv Environ Res 2002, 6:471.