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第 36 卷第 6 期                             精   细   化   工                                  Vol.36, No.6
             201 9 年 6 月                             FINE CHEMICALS                                 June    2019


              水处理技术与环境保护
                    CuO/TiO 纳米纤维可见光催化 CO 合成甲醇
                                     2
                                                                                   2

                                                                                 *
                                       谈   恒,肖   洒,姚淑荣,熊春荣
                   (海南大学  南海海洋资源利用国家重点实验室,海南省特种玻璃重点实验室,海南  海口    570228)


                 摘要:以介孔 SiO 2 球为模板、TiCl 4 为前驱体,  采用气相生长法制备了直径为 8~10  nm 的 TiO 2 纳米纤维,然后
                 采用浸渍法制备了具有异质结结构的 CuO/TiO 2 纳米纤维,  在可见光照射下催化 CO 2 合成甲醇。通过 SEM、TEM、
                 XPS、UV-Vis、XRD、荧光光谱(PL)对催化剂进行了表征。结果表明:TiO 2 纳米纤维较锐钛矿 TiO 2 纳米颗粒
                 和商业 TiO 2 纳米颗粒(P25)荧光强度明显降低,光生电子-空穴对更加稳定。通过在 TiO 2 纳米纤维上负载 CuO
                 形成异质结结构后,进一步降低了催化剂的荧光强度,也增强了在可见光区的吸收。在 300 W 氙灯照射 5 h 进
                 行光催化 CO 2 合成甲醇实验中,P25 负载 CuO 后,催化合成甲醇产量为 676 μmol/g-cat,而负载了 CuO 的 TiO 2
                 纳米纤维,甲醇产量达 1791 μmol/g-cat,较 CuO/P25 提高了 165%。
                 关键词:TiO 2 纳米纤维;CO 2 ;甲醇;可见光;水处理技术
                 中图分类号:O69 TQ032      文献标识码:A      文章编号:1003-5214 (2019) 06-1210-07


                              Visible Light Driven Reduction of CO 2 to Methanol

                                            Over CuO/TiO 2 Nanofibers

                                                                                      *
                                  TAN Heng, XIAO Sa, YAO Shu-rong, XIONG Chun-rong
                 (State Key Laboratory of Marine Resource Utilization in  the South China Sea, Key Laboratory of Special Glass in
                 Hainan Province, Hainan University, Haikou 570228, Hainan, China)


                 Abstract: TiO 2 nanofibers with diameter of 8~10 nm were successfully prepared by vapor-phase growth
                 with mesoporous SiO 2 spheres as template and TiCl 4 as precursor. Subsequently, CuO/TiO 2 nanofibers with
                 a heterojunction structure were prepared through impregnation method for visible-light driven reduction of
                 CO 2 to methanol. SEM、TEM、XPS、UV-Vis、XRD and photoluminescence (PL) were used to characterize the
                 crystal  structure,  morphology,  chemical  valence,  visible  light  absorption  intensity  and  electron-hole
                 recombination rate, respectively. Compared with commercial TiO 2 nanoparticles (P25) and anatase TiO 2
                 nanoparticles,  the  prepared  TiO 2  nanofibers  show  much  lower  fluorescence  intensity  and  more  stable
                 photogenerated electron-hole pair. Loading of CuO onto TiO 2 nanofibers further reduce the fluorescence
                 intensity  and  enhance  absorption  of  visible  light.  In  the  photocatalytic  CO 2  to  methanol  synthesis
                 experiment  under  300  W  xenon  lamp  irradiation  for  5  h,  the  yield  of  methanol  over  CuO/P25  was
                 676 μmol/g-cat,  while  that  over  CuO/TiO 2  nanofibers  reached  1791 μmol/g-cat,  which  was  165%  higher
                 than that over CuO/P25.
                 Key words: TiO 2 nanofibers; CO 2; methanol; visible light; water treatment technology
                 Foundation items: Major Scientific and Technological Project of Hainan Province (ZDKJ2017011); Key
                 Research and Development Project of Hainan Province (ZDYF2016017)


                 环境恶化和一次性能源日益枯竭是人类目前面                          转化为燃料资源成为许多科学家研究的重点                      [1-2] 。
                                                                            [3]
            临的两大问题,传统能源产生的温室气体 CO 2 对环                         1980 年 Ulman  等制备了 SrTiO 3 催化剂,首次进行
            境构成了严重的威胁,利用可持续的太阳能将 CO 2                          紫外光催化还原 CO 2 合成甲醇。之后大量学者开始


                 收稿日期:2018-09-25;  定用日期:2019-02-02; DOI: 10.13550/j.jxhg.20180713
                 基金项目:海南省重大科技计划项目(ZDKJ2017011);海南省重点研发计划项目(ZDYF2016017)
                 作者简介:谈   恒(1993—),男,硕士生,E-mail:936525712@qq.com。联系人:熊春荣(1973—),教授,E-mail:bearcr_82@hotmail.com。
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