CO2作为温室气体的主要成分,其捕集与光催化利用已成为减排的主要手段。高效节能的 CO2吸附剂和光催化剂的制备成为近年来研究的热点。本文采用共沉淀法,制备了一系列类水滑石 Li/Al-LDHs(Li/Al-layered double hydroxides)催化剂。通过原子吸收光谱(AAS)、X射线衍射(XRD)、扫描电镜(SEM)、热重分析(TG)、紫外可见分光光度计(UV)等技术对样品进行表征。考察了不同制备条件(p H 值、水浴时间)及 Ti4＋的添加对类水滑石的结构、形貌及CO2光催化性能的影响。结果表明,pH 值在7~8,水浴时间为36 h 时的 Li3 Al1-LDHs结晶度最好。不同摩尔比的 Li/Al-LDHs 均具有光催化反应活性；Ti1 Li3 Al1-LDHs 的光催化性能较好, CH4产率较高。
CO2 (Carbon dioxide)is the main greenhouse gases.The capture and photocatalysis is considered to be one of the effective approaches for reducing carbon dioxide emission.So,the preparation of CO2 adsorption and photocatalysis materials is being a research hot spot,which is of high efficiency and low enregy consumption.A series of Hydrotalcite like Li/Al-LDHs catalytic materials were prepared by coprecipitation method and charac-terized by atoimc absorption spectrophotometer (AAS),X ray diffraction (XRD),scanning electron microscopy (SEM),thermal gravimetric analysis (TG)and ultraviolet visible spectrophotometer (UV),etc.The influence of preparation condition(contain ph and water bath time)and adding Ti4+on the structure,morphology and CO2 photocatalytic properties of LDHs was discussed.The results showed that,the Li3 Al1-LDHs displays the highest crystallinity when the ph in 7-8 and water bath time for 3 6 h.Meanwhile,all the moles ratios of Li/Al-LDHs were photocatalytic activities.The photocatalytic activity and the productivity of CH4 were improved of Ti1 Li3 Al1-LDHs obtained by adding Ti4+.
参考文献
| [1] | Wang, J.;Stevens, L.A.;Drage, T.C.;Wood, J..Preparation and CO _2 adsorption of amine modified Mg-Al LDH via exfoliation route[J].Chemical Engineering Science,20121(1):424-431. |
| [2] | Ortrud Aschenbrenner;Paul McGuire;Suzanne Alsamaq.Adsorption of carbon dioxide on hydrotalcite-like compounds of different compositions[J].Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers,20119(9):1711-1721. |
| [3] | Hadnadjev-Kostic, M.;Vulic, T.;Ranogajec, J.;Marinkovic-Neducin, R.;Radosavljevic-Mihajlovic, A..Thermal and photocatalytic behavior of Ti/LDH nanocomposites[J].Journal of thermal analysis and calorimetry,20132(2):1155-1162. |
| [4] | Walspurger, S.;Cobden, P.D.;Safonova, O.V.;Wu, Y.;Anthony, E.J..High CO_2 storage capacity in alkali-promoted hydrotalcite-based material: In situ detection of reversible formation of magnesium carbonate[J].Chemistry: A European journal,201042(42):12694-12700. |
| [5] | Xinfang Yang;Lifeng Zhao;Yunhan Xiao.Effect of NaNO_3 on MgO-CaCO_3 Absorbent for CO_2 Capture at Warm Temperature[J].Energy & Fuels,2013Nov./Dec.(Nov./Dec.):7645-7653. |
| [6] | Keling Zhang;Xiaohong S. Li;Yuhua Duan;David L. King;Prabhakar Singh;Liyu Li.Roles of double salt formation and NaNO_3 in Na_2CO_3-promoted MgO absorbent for intermediate temperature CO_2 removal[J].International Journal of Greenhouse Gas Control,2013:351-358. |
| [7] | M.H. Halabi;M.HJ.M. de Croon;J. van der Schaaf;P.D. Cobdcn;J.C Schouten.High capacity potassium-promoted hydrotalcite for CO_2 capture in H_2 production[J].International journal of hydrogen energy,20125(5):4516-4525. |
| [8] | Lwin, Y;Abdullah, F.High temperature adsorption of carbon dioxide on Cu-Al hydrotalcite-derived mixed oxides: kinetics and equilibria by thermogravimetry[J].Journal of thermal analysis and calorimetry,20093(3):885-889. |
| [9] | Ken-ichi Katsumata;Kazuya Sakai;Kei Ikeda;Gabriela Carja;Nobuhiro Matsushita;Kiyoshi Okada.Preparation and photocatalytic reduction of CO_2 on noble metal (Pt, Pd, Au) loaded Zn-Cr layered double hydroxides[J].Materials Letters,2013Sep.15(Sep.15):138-140. |
| [10] | Abhoyjit S. Bhown;Brice C. Freeman.Analysis and Status of Post-Combustion Carbon Dioxide Capture Technologies[J].Environmental Science & Technology: ES&T,201120(20):8624-8632. |
| [11] | Shan-Li Wang;Cheng-Hsien Lin;Ya-Yi Yan;Ming K. Wang.Synthesis of Li/Al LDH using aluminum and LiOH[J].Applied clay science,2013Feb.(Feb.):191-195. |
| [12] | 成娅;周家斌;王磊;张忠;刘艳丽.焙烧态锂铝水滑石对水中氟离子吸附性能研究[J].环境污染与防治,2012(2):34-38. |
| [13] | Abdelkrim Azzouz;Vasilica-Alisa Arus,;Nicoleta Platon.Polyol-modified layered double hydroxides with attenuated basicity for a truly reversible capture of CO2[J].Adsorption,20135(5):909-918. |
| [14] | Mingfei Shao;Jingbin Han;Min Wei.The synthesis of hierarchical Zn-Ti layered double hydroxide for efficient visible-light photocatalysis[J].Chemical engineering journal,20112(2):519-524. |
| [15] | Laura Teruel;Younes Bouizi;Pedro Atienzar;Vicente Fornes;Hermenegildo Garcia.Hydrotalcites of zinc and titanium as precursors of finely dispersed mixed oxide semiconductors for dye-sensitized solar cells[J].Energy & environmental science: EES,20101(1):154-159. |
| [16] | Iguchi, Shoji;Teramura, Kentaro;Hosokawa, Saburo;Tanaka, Tsunehiro.Photocatalytic conversion of CO2 in an aqueous solution using various kinds of layered double hydroxides[J].Catalysis Today,2015:140-144. |
| [17] | Gabriele Centi;Siglinda Perathoner.Opportunities and prospects in the chemical recycling of carbon dioxide to fuels[J].Catalysis Today,20093/4(3/4):191-205. |
| [18] | Hosni, Khaled;Abdelkarim, Omar;Frini-Srasra, Najoua;Srasra, Ezzeddine.Synthesis, structure and photocatalytic activity of calcined Mg-Al-Ti-layered double hydroxides[J].The Korean journal of chemical engineering,20151(1):104-112. |
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