摘要
包载型光催化剂可有效解决粉末催化剂处理水中污染物时的回收和再循环问题。以P25TiO_(2)为原料制备alg Ca/Ti O_(2)凝珠,利用XRD、UV-Vis、FESEM、EDX等技术手段获得催化剂的结构、组成和光吸收性能,研究alg Ca/Ti O_(2)吸附-光催化协同去除水中Cr(Ⅵ)的性能。结果表明,alg Ca裸珠对Cr(Ⅵ)的吸附去除率为14.5%;在30 W紫外汞灯照射下,alg Ca/Ti O_(2)-9通过吸附-光催化将Cr(Ⅵ)还原为Cr(Ⅲ)的效率为66.9%。alg Ca/Ti O_(2)表面基团与Cr(Ⅲ)产生的静电引力使催化剂表面残留Cr(Ⅲ),4次循环利用的alg Ca/Ti O_(2)活性为53.8%。同时,提出了吸附-光催化反应机理。
A supported photocatalyst is preferred for practical water treatment applications of photocatalytic technology,which can solve the recovery and recycle problems of powder photocatalyst in photocatalytic degradation of pollutants in water. Alg Ca/TiO_(2) beads are prepared with P25 TiO_(2),sodium alginate and calcium chloride as raw materials. The composition,structure and light absorption properties of Alg Ca/TiO_(2) beads photocatalyst are characterized by means of XRD,UV-Vis DRS,TEM,FESEM and EDS,and the adsorption-photocatalytic performance to remove aqueous Cr( Ⅵ) are investigated. Experimental results show that adsorption removal rate of aqueous Cr( Ⅵ) by alg Ca bare beads is 14. 5%. The reduction efficiency of Cr( Ⅵ) to Cr( Ⅲ) reaches 66. 9% through synergy of adsorption and photocatalysis over alg Ca/TiO_(2)-9 beads under 30 W of ultraviolet light irradiation. The electrostatic attraction between surficial groups of alg Ca/TiO_(2)-9 beads and Cr( Ⅲ) causes residual Cr( Ⅲ) to leave on the surface of the beads. The activity of alg Ca/TiO_(2) after four cycles of uses remains 53. 8%. The adsorption-photocatalysis mechanism is revealed.
作者
李靖
王瑜
余艳
邱超
吴光亮
陈艳
杨华美
LI Jing;WANG Yu;YU Yan;QIU Chao;WU Guang-liang;CHEN Yan;YANG Hua-mei(School of Materials and Chemical Engineering,Xuzhou University of Technology,Xuzhou 221018,China)
出处
《现代化工》
CAS
CSCD
北大核心
2021年第8期128-132,138,共6页
Modern Chemical Industry
基金
江苏省自然科学基金(BK20171168,BK20190156)
江苏高校青蓝工程资助项目(2018)
江苏省高校自然科学基金重大项目(18KJA430015)
大学生创新训练计划项目(xcx2020132,xcx2021002)。
关键词
吸附-光催化
协同作用
六价铬
固载
TiO_(2)
absorption-photocatalysis
synergistic effect
hexavalent chromium
immobilization
titanium dioxide