环境工程学报
環境工程學報
배경공정학보
CHINESE JOURNAL OF ENVIRONMENTAL ENGINEERING
2010年
2期
458-464
,共7页
敏世雄%王芳%魏立强%王永生%冯雷%佟永纯%韩玉琦
敏世雄%王芳%魏立彊%王永生%馮雷%佟永純%韓玉琦
민세웅%왕방%위립강%왕영생%풍뢰%동영순%한옥기
可见光%Fe~(3+)-TiO_2/ATP光催化剂%MB%光催化降解
可見光%Fe~(3+)-TiO_2/ATP光催化劑%MB%光催化降解
가견광%Fe~(3+)-TiO_2/ATP광최화제%MB%광최화강해
visible light%Fe~(3+)-TiO_2/ATP composite photocatalyst%methylene blue%photocatalytic degra-dation
采用酸催化的溶胶-凝胶法制备了一系列Fe~(3+)掺杂TiO_2/凹凸棒(Fe~(3+)-TiO_2/ATP)复合光催化剂材料.在可见光条件下,以亚甲基蓝(MB)溶液的光催化降解反应,评价了样品的光催化性能,研究了TiO_2负载量、Fe~(3+)掺杂量和焙烧温度对复合材料光催化性能的影响.在单凶素实验的基础上,采用正交实验设计(L_25(5~3))优化了催化剂的制备条件.光催化实验结果表明,MB在复合材料卜的光催化降解反应遵循Langmuir-Hinshelwood(L-H)动力学模型.正交实验结果表明,当TiO_2负载量为15%、Fe~(3+)掺杂量为0.5%和焙烧温度为550 ℃时,得到的复合材料对MB的光催化降解效率最佳,测得表观反应速率常数k＿(qpp)为6.09×10~(-3)min~(-1),反应4 h后MB的降解率(D~t)可达75.88%,相同实验条件下与P25(1.51 ×10~(-3)min~(-1))相比较,反应速率提高了4.03倍,降解率提高了45.05%.另外,复合材料的沉降性能优于P25,易于分离,是一类有应用前景的复合光催化剂.
採用痠催化的溶膠-凝膠法製備瞭一繫列Fe~(3+)摻雜TiO_2/凹凸棒(Fe~(3+)-TiO_2/ATP)複閤光催化劑材料.在可見光條件下,以亞甲基藍(MB)溶液的光催化降解反應,評價瞭樣品的光催化性能,研究瞭TiO_2負載量、Fe~(3+)摻雜量和焙燒溫度對複閤材料光催化性能的影響.在單兇素實驗的基礎上,採用正交實驗設計(L_25(5~3))優化瞭催化劑的製備條件.光催化實驗結果錶明,MB在複閤材料蔔的光催化降解反應遵循Langmuir-Hinshelwood(L-H)動力學模型.正交實驗結果錶明,噹TiO_2負載量為15%、Fe~(3+)摻雜量為0.5%和焙燒溫度為550 ℃時,得到的複閤材料對MB的光催化降解效率最佳,測得錶觀反應速率常數k＿(qpp)為6.09×10~(-3)min~(-1),反應4 h後MB的降解率(D~t)可達75.88%,相同實驗條件下與P25(1.51 ×10~(-3)min~(-1))相比較,反應速率提高瞭4.03倍,降解率提高瞭45.05%.另外,複閤材料的沉降性能優于P25,易于分離,是一類有應用前景的複閤光催化劑.
채용산최화적용효-응효법제비료일계렬Fe~(3+)참잡TiO_2/요철봉(Fe~(3+)-TiO_2/ATP)복합광최화제재료.재가견광조건하,이아갑기람(MB)용액적광최화강해반응,평개료양품적광최화성능,연구료TiO_2부재량、Fe~(3+)참잡량화배소온도대복합재료광최화성능적영향.재단흉소실험적기출상,채용정교실험설계(L_25(5~3))우화료최화제적제비조건.광최화실험결과표명,MB재복합재료복적광최화강해반응준순Langmuir-Hinshelwood(L-H)동역학모형.정교실험결과표명,당TiO_2부재량위15%、Fe~(3+)참잡량위0.5%화배소온도위550 ℃시,득도적복합재료대MB적광최화강해효솔최가,측득표관반응속솔상수k＿(qpp)위6.09×10~(-3)min~(-1),반응4 h후MB적강해솔(D~t)가체75.88%,상동실험조건하여P25(1.51 ×10~(-3)min~(-1))상비교,반응속솔제고료4.03배,강해솔제고료45.05%.령외,복합재료적침강성능우우P25,역우분리,시일류유응용전경적복합광최화제.
A series of Fe~(3+) doped TiO_2/attapulgite composite photocatalyst ( Fe~(3+) -TiO_2/ATP) were synthe-sized by acid-catalyzed sol-gel process. Their photocatalytic activity was evaluated by degrading methylene blue ( MB) in aqueous solution under visible light irradiation. The influences of TiO_2 loading amounts, Fe~(3+) doping amounts and calcination temperature were studied. Based on the above results, the preparation condition of com-posite photocatalyst was optimized by the orthogonal experiments ( L_25 ( 5~3) ) . The results of photocatalytic experi-ments showed that the degradation of MB on the composite catalysts followed the Langmuir-Hinshelwood ( L-H) first-order reaction model. The optimal photocatalytic activity of composite particles was realized when the TiO_2 loading amounts was 15% , Fe~(3+) doping amounts was 0.5% and calcination temperature was 550 ℃, and the de-termined kinetic parameters k_(app) and degradation efficiency( D_t) were 6. 09 × 10~(-3)min ~(-1) and 75. 88% after 4 h of visible light irradiation, respectively. Comparing with P25 (1. 51 × 10~(-3)min~(-1)) , the apparent reaction rate con-stant increased about 4. 03 times and the photodegradation efficiency increased about 45. 05% . Furthermore, the Fe~(3+) -TiO_2/ATP composite photocatalyst exhibited easy separation property comparing with P25. The advantages of composite photocatalyst revealed its great practical potential in wastewater treatment.
