利用动态尿素水解法制备了3种不同比例的ZnAlTi型层状双氢氧化物，取部分样品分别在温度为500、600、700和900℃条件下煅烧4h，制得具有光催化性能的材料。研究催化剂不同摩尔比、催化剂用量、煅烧温度等不同因素对光催化降解亚甲基蓝过程的影响。结果表明，紫外光照射下，在反应温度为30℃、催化剂中Ti和Al的摩尔比为2、催化剂投加浓度为1．0g／L、亚甲基蓝初始浓度为10mg／L、煅烧温度为600。C的反应条件下，催化剂对亚甲基蓝的降解效果最好，光照反应12h后亚甲基蓝的降解率为94．4％。
ZnA1Ti layered double hydroxides (LDHs) with different Zn : AI : Ti ratio were synthesized by dy-namic urea hydrolysis method. Part of these samples were calcined at 500, 600, 700 and 900 ℃, respectively tor 4h, obtaining calcined photocatalysts ZnA1Ti-LDHs. The effects of experimental parameters such as the differ- ent molar ratio of catalyst, catalyst dose, and calcination temperature on the photocatalytic degradation of methylene blue (MB) process were evaluated in detail. The results showed that under the conditions of reaction temperature at 30℃, Ti : A1 molar ratio of 2: 1, 1.0 g/L catalyst loading, 10 mg/L initial MB concentration within 12h UV-light irradiation, 94.4% degradation rate of MB was obtained.
参考文献
| [1] | Maitha M.Alnuaimi;M.A.Rauf;S.Salman Ashraf .Comparative decoloration study of Neutral Red by different oxidative processes[J].Dyes and Pigments,2007(26):367-371. |
| [2] | 刘颖,李益民,温丽华,李海洋.铁柱撑膨润土及染料橙二的光催化降解[J].功能材料,2005(01):136-138,141. |
| [3] | 李坤林,陈武强,李小婷,苑宝玲.UV/Si-FeOOH/H2O2氧化降解水中邻苯二甲酸二甲酯[J].环境科学,2010(09):2075-2079. |
| [4] | Chen Q Q;Wu P X;Li Y Y et al.Heterogeneous pho to-Fenton photodegradation of reactive brilliant orange X GN over iron-pillared montmorillonite under visible irradi ation[J].Journal of Hazardous Materials,2009,168(2-3):901-908. |
| [5] | 沈秀红,纪全,夏延致,孔庆山.二氧化钛催化光降解聚对苯二甲酸乙二酯的研究[J].功能材料,2009(07):1137-1139. |
| [6] | 徐航,王建旭,王金福.室温固相法制备纳米氧化锌及光催化降解活性黑5动力学[J].功能材料,2010(04):616-619,622. |
| [7] | Shi LY.;Gu HC.;Fang DY.;Li CZ. .Morphology and properties of ultrafine SnO2-TiO2 coupled semiconductor particles[J].Materials Chemistry and Physics,2000(1):62-67. |
| [8] | Bonamali Pal;Tomohiro Hata;Kouichi Goto;Gyoichi Nogami .Photocatalytic degradation of o-cresol sensitized by iron-titania binary photocatalysts[J].Journal of molecular catalysis, A. Chemical,2001(1/2):147-155. |
| [9] | Seftel E M;Popovici E;Mertens M et al.Zn-AI layered double hydroxides:synthesis,characterization and photo- catalytic application[J].Microporous and Mesoporous Materials,2008,113(1-3):296-304. |
| [10] | Mantilla A;Tzompantzi F;Fernandez J L et al.Photo- degradation of 2,4rdiehlorophenoxyaeetic acid using ZnA1Fe layered double hydroxides as photocatalysts[J].Catalysis Today,2009,148(1-2):119-123. |
| [11] | Valente J S;Tzompantzi F;Prince J et al.Adsorption and photocatalytic degradation of phenol and 2,4 dichlo rophenoxiacetic acid by Mg-Zn-AI layered double hy- droxides[J].Applied Catalysis B:Environmental,2009,90(3-4):330-338. |
| [12] | C. Del Hoyo .Layered double hydroxides and human health: An overview[J].Applied clay science,2007(1/3):103-121. |
| [13] | Seftel E M;Popovici E;Mertens M et al.The influ- ence of the cationic ratio on the incorporation of Ti4+ in the brucite-like sheets of layered double hydroxides[J].Microporous and Mesoporous Materials,2008,111(1-3):12-17. |
| [14] | Tichit D.;Das N.;Coq B.;Durand R. .Preparation of Zr-containing layered double hydroxides and characterization of the acido-basic properties of their mixed oxides[J].Chemistry of Materials,2002(4):1530-1538. |
| [15] | Seftel E M;Popovici E;Mertens M et al.SnW-contai- ning layered double hydroxides as precursors for nano- sized ZnO/SnO2 photocatalysts[J].Applied Catalysis B:Environmental,2008,84(3-4):699-705. |
| [16] | Mantilla A;Tzompantzi F;Fernandez J L et al.Photo- degradation of phenol and cresol in aqueous medium by using Zn/A1 plus Fe mixed oxides obtained from layered double hydroxides materials[J].Catalysis Today,2010,150(3-4):353-357. |
| [17] | Toshiyuki Hibino;Hitoshi Ohya .Synthesis of crystalline layered double hydroxides: Precipitation by using urea hydrolysis and subsequent hydrothermal reactions in aqueous solutions[J].Applied clay science,2009(3):178-184. |
| [18] | Nigamananda Das;Amrendra Samal .Synthesis, characterisation and rehydration behaviour of titanium(IV) containing hydrotalcite like compounds[J].Microporous and Mesoporous Materials,2004(1/3):219-225. |
| [19] | Wang C;Zhao J C;Wang X M et al.Preparation,characterization and photocatalytic activity of nano-sized ZnO/SnO2 coupled photocatalysts[J].Applied Cataly- sis B-Environmental,2002,39(03):269-279. |
| [20] | Titania deposited on soft magnetic activated carbon as a magnetically separable photocatalyst with enhanced activity[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2010(21):P.6191. |
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