工业水处理 ›› 2025, Vol. 45 ›› Issue (11): 102-109. doi: 10.19965/j.cnki.iwt.2024-0939

• 试验研究 • 上一篇    

回收混凝土粉末负载TiO2催化剂的制备及光催化性能

贾广征1(), 刘思乐2, 杜文娟3   

  1. 1. 河南建筑职业技术学院工程管理系,河南 郑州 450064
    2. 沈阳科技学院化工与制药学院,辽宁 沈阳 110167
    3. 山东飞洋环境工程有限公司,山东 济南 250000
  • 收稿日期:2025-03-04 出版日期:2025-11-20 发布日期:2025-11-20
  • 作者简介:

    贾广征(1980— ),硕士,讲师,E-mail:

  • 基金资助:
    辽宁省教育厅高等学校基本科研项目面上项目(LJKM20221989)

Preparation and photocatalytic performance of TiO2 supported on recycled concrete powder

Guangzheng JIA1(), Sile LIU2, Wenjuan DU3   

  1. 1. Department of Engineering Management, Henan Technical College of Construction, Zhengzhou 450064, China
    2. College of Chemical and Pharmaceutical Sciences, Shenyang Institute of Science and Technology, Shenyang 110167, China
    3. Shandong Feiyang Environmental Engineering Limited Company, Jinan 250000, China
  • Received:2025-03-04 Online:2025-11-20 Published:2025-11-20

摘要:

以回收混凝土粉末(RCP)作为载体,TiO2作为光催化活性中心,采用机械化学法制备了RCP/TiO2光催化剂。通过X射线衍射谱(XRD)、N2吸附-脱附曲线、紫外可见漫反射光谱(UV-vis DRS)、光致发光光谱(PL)、瞬态光电流谱(TPC)和电化学交流阻抗谱(EIS)表征了RCP/TiO2光催化剂的物相晶型、比表面积、孔隙结构和光电化学性质,评价了光催化剂在紫外光照射下降解有机染料亚甲基蓝(MB)的活性和稳定性,分析了共存无机盐离子和水基质对RCP/TiO2光催化降解MB效果的影响,研究了体系中的活性物种及活性物种的贡献率。结果表明:RCP的引入提高了光催化剂的比表面积、光谱吸收能力和电荷转移速率,实现了光生载流子的高效分离。紫外光照射90 min,RCP/TiO2催化剂对溶液中MB的光催化降解率达到了99.91%,循环使用10次后对MB的光催化降解率仍为99.10%,表现出良好的循环稳定性。共存无机盐离子和水基质会对RCP/TiO2催化剂的催化活性产生抑制作用。O2 ·-、·OH、h+等活性物种协同作用实现了对MB的高效降解,光催化反应遵循Type-Ⅱ机理。

关键词: TiO2, 回收混凝土粉末, 光催化剂, 亚甲基蓝

Abstract:

RCP/TiO2 photocatalyst was prepared by mechanochemical method using recycled concrete powder (RCP) as carrier and TiO2 as photocatalytic activity center. X-ray diffraction (XRD), N2 adsorption-desorption, UV-vis diffuse reflectance spectroscopy (UV-vis DRS), photoluminescence spectroscopy (PL), transient photocurrent spectroscopy (TPC) and electrochemical impedance spectroscopy (EIS) were used to characterize the crystal phase, specific surface area, porosity and photoelectrochemical properties of RCP/TiO2 photocatalyst. The photocatalytic activity and stability of RCP/TiO2 photocatalyst for the degradation of organic dye methylene blue (MB) under ultraviolet light irradiation were evaluated. The effects of coexisting inorganic salt ions and water matrix on the photocatalytic degradation of MB by RCP/TiO2 were analyzed. The active species in the system and the contribution of active species were studied. The results showed that the introduction of RCP increased the specific surface area of photocatalyst, improved the spectral absorption capacity, increased the charge transfer rate, and realized the efficient separation of photogenerated carriers. After 90 min of UV irradiation, the photocatalytic degradation rate of MB in solution by RCP/TiO2 catalyst reached 99.91%. After 10 cycles, the photocatalytic degradation rate of MB was still 99.10%, demonstrating excellent cycle stability. The coexistence of inorganic salt ions and water matrix would inhibit the photocatalytic activity of RCP/TiO2 catalyst. The synergistic effect of active species including O2 ·-,·OH, and h+ achieved efficient degradation of MB, and the photocatalytic reaction followed the Type-Ⅱ mechanism.

Key words: TiO2, recycled concrete powder, photocatalyst, methylene blue

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