Efficient visible-light responsive TiO₂ nanoparticles incorporated magnetic carbon photocatalysts

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• 作者：Hyun Uk Lee ; Gaehang Lee ; Ji Chan Park ; Young-Chul Lee ; Sang Moon Lee ; Byoungchul Son ; So Young Park ; Changsoo Kim ; SangGap Lee ; Soon Chang Lee ; Bora Nam ; Jae Won Lee ; Doo Ri Bae ; Jae-Sik Yoon ; Jouhahn Lee
• 关键词：TiO2 ; Photocatalytic activity ; Activated carbon ; Ultrasound irradiation
• 刊名：Chemical Engineering Journal
• 出版年：15 March, 2014
• 年：2014
• 卷：240
• 期：Complete
• 页码：91-98
• 全文大小：2333 K

文摘

We developed a photocatalyst (T-FC) that incorporated anatase TiO₂ (T) nanoparticles on magnetically enhanced carbon [iron oxide (F; 伪,纬-Fe₂O₃-Fe₃O₄) supported on activated carbon (C)] for use as a highly visible-light-active, low-cost, recyclable, and photostable catalyst for the degradation of organic dyes and bacterial sterilization. The T-FC photocatalyst with a large Brunauer-Emmett-Teller surface area (564.3 m² g^鈭?) was synthesized by wet-chemical processing and ultrasound irradiation. Under visible-light irradiation, the highest photocatalytic activity for T-FC ([k] = 3.874 h^鈭?) was 32.6 and 3.1 times higher than those of T ([k] = 0.119 h^鈭?) and FC ([k] = 1.259 h^鈭?). The recyclability of T-FC was high, with a dye decolorization rate measured at 鈭?5.8% of the initial value after 15 recycles. Furthermore, T-FC showed more substantial antimicrobial properties against both Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus aureus (S. aureus) than T and FC when exposed to visible-light for 120 min. Even after 10 cycles of use, T-FC killed more than 95.7% of E. coli. These results indicated that T-FC might have utility in several promising applications such as wastewater treatment and as a bactericidal agent.