Influence factors of photocatalytic activity of the filter media modified by Ti[O.sub.2]/Ispitivanje faktora koji uticu na fotokataliticku aktivnost filtera modifikovanih Ti[O.sub.2]

• Published in: Hemijska industrija Vol. 68; no. 6; p. 809
• Main Authors: Shen, Rongyan, Feng, Guoyong, Liang, Yuting, Zhao, Xingqing, Zhang, Wenyi
• Format: Journal Article
• Language: English
• Published: Association of Chemical Engineers of Serbia 01.11.2014
• Subjects: Observations; Photocatalysis; Properties; Titanium dioxide
• ISSN: 0367-598X
• DOI: 10.2298/HEMIND131017010S

The gangue filter media was modified by the titanium dioxide (Ti[O.sub.2]) through the liquid phase deposition method. Some influence factors of photocatalytic activity were investigated, including the mole ratio of initial solution, the water bath temperature, the deposition time, the calcination temperature and the heat preservation time of calcination. The morphology of the film was examined by SEM, EDS and crystallite structure by X- Ray Diffraction (XRD). The SEM, EDS and XRD data showed that new Ti[O.sub.2] crystal was found in the modified filter media. And the specific surface area of the modified filter media greatly increased. By the orthogonal experiment, the optimum parameters of modification were [(N[H.sub.4]).sub.2]Ti[F.sub.6]:[H.sub.3]B[O.sub.3] = 1:2, water bath temperature of 80°C, deposition time of 5 h, calcination temperature of 500°C, and 1 h heat preservation time of calcination. Under above conditions, the heavy nitrogen wastewater of 1589.94 mg/L COD and 18750 times chroma was treated by the modified filter media. After 1 h catalytic reaction, the decolorization rate and COD removal rate reached 65.89 and 47.87%, respectively. Keywords: Ti[O.sub.2], liquid phase deposition, heavy nitrogen, decolorization rate, COD. Gangue filter je modifikovan pomocu titan-dioksida (Ti[O.sub.2]) metodom depozicije u tecnoj fazi. Ispitivani su neki cinioci koji uticu na fotokataliticku aktivnost, kao sto je molarni odnos pocetnog rastvora, temperatura vodenog kupatila, vreme depozicije, temperatura kalcinacije i duzina kalcinacije. Morfologija filma je ispitivana pomocu SEM i EDS, a kristalna struktura pomocu difrakcije X-zraka (XRD). Podaci dobijeni pomocu SEM, EDS i XRD su pokazali da je u modifikovanom filteru pronadena nova Ti[O.sub.2] kristalna faza. Specificna povrsina modifikovanog filtera je znacajno povecana. Kod vertikalnog eksperimenta optimalni parametri modofikacije su: [(N[H.sub.4]).sub.2]Ti[F.sub.6]:[H.sub.3]B[O.sub.3] = 1:2, temperatura vodenog kupatila 80°C, vreme depozicije 5 h, temperatura kalcinacije od 500°C i duzina kalcinacije 1 h. Pod pomenutim uslovima, otpadna voda teskog azota od 1589,94 mg/L COD i 18750 puta vece koncentracije hroma tretirana je pomocu modifikovanog filtera. Posle 1 h kataliticke reakcije, brzina obezbojavanja i brzina COD odstranjivanja je dostigla 65,89 i 47,87%, redom. Kljucne reci: Ti[O.sub.2] * Depozicija u tecnoj fazi * Teski azot * Brzina obezbojavanja * COD Available online at the Journal website: