本文系统分析了国内外去除水中药品与个人护理品（PPCPs）的各种工艺，发现可见光响应光催化技术由于具有降解速度快、矿化率高和以太阳光为能源等特点，近年来已引起人们的广泛关注。本文在深入分析了不同光催化剂的基础上，选取了对可见光吸收性能较好的尖晶石型硫化物（CdIn2S4）和酸改性的g-C3N4（ag-C3N4）进行复合，以碳量子点（CQDs）为电子转移媒介，构建Z型异质结，成功合成了碳量子点界面修饰ag-C3N4/CQDs/CdIn2S4复合光催化剂（简写为CN/CQDs/CIS）。以布洛芬作为PPCPs的模型目标污染物，考察了合成的光催化剂的可见光催化降解性能，揭示了光催化降解过程中电子迁移转化机制和污染物降解机理，并通过循环实验测试了光催化剂的稳定性，探究了不同的水质条件（pH、无机阴离子和腐殖酸）对催化剂的光催化效能影响。本研究所得结论如下： （1）优化制备了ag-C3N4/CQDs/CdIn2S4复合光催化剂，CQDs和ag-C3N4的引入，明显提高了复合光催化剂的可见光吸收性能、光催化活性，且该复合催化剂具有较高的稳定性。优化制备的CN-2/CQDs-3/CIS复合催化剂展现了优异的可见光催化活性，在60 min内对布洛芬的去除率达到91.0%，TOC去除率达到85.0%，比单独的CIS分别提高了44.1%和48.6%。这主要是因为碳量子点的负载明显提高了复合催化剂对可见光的吸收能力；碳量子点以共价键的形式将CIS和CN紧密连接在一起，有效提高了光生载流子的分离效率，从而显著提高了CN-2/CQDs-3/CIS复合光催化剂的光催化性能。该催化剂经过四次循环使用后，对布洛芬的去除效率和矿化程度仍然维持在较高水平。 （2）根据能带弯曲理论和碳量子点具有快速转移电子的性能，CN-2/CQDs-3/CIS复合光催化剂遵循Z型异质结电子迁移转化机制。碳量子点可见光催化还原AgNO3溶液和密度泛函理论（DFT）计算表明，碳量子点具有较强的快速转移电子的能力，将碳量子点引入到催化剂中，可以显著降低光生载流子的复合效率。由于碳量子点的费米能级（Ef=-0.08 eV）较低且CIS的导带向下弯曲，CIS导带上的光生电子易于转移至碳量子点上，碳量子点作为高效的电子传输媒介，迅速将从CIS获得的电子转移，与ag-C3N4的价带上的空穴进行复合，从而进一步提高了ag-C3N4导带上的光生电子和CIS价带上的空穴的分离效率。通过Z型异质结分离得到的光生电子和空穴经过一系列光化学反应，生成空穴h+、·OH和·O2-活性自由基，在这些活性物种作用下布洛芬被氧化降解。 （3）CN-2/CQDs-3/CIS复合催化剂在pH=5~9条件下都有着很好的光催化活性，对布洛芬的去除效率较高，但在强酸性（pH=3）和强碱性（pH=11）条件下，其光催化性能大幅下降；在五种常见的无机阴离子中，HCO3-和H2PO4-对催化剂的光催化活性表现出了明显的抑制作用，而Cl-、SO42-和NO3-则对催化剂的降解性能影响不大；低浓度的HA对整个光催化体系的光催化活性无明显影响，但随着HA浓度的增加，则表现为抑制作用。

According to the systematic analysis of various processes for removing pharmaceuticals and personal care products (PPCPs) at home and aboard in this paper, it was found that visible-light-response photocatalytic technology, which has characteristics of fast degradation rate, thorough mineralization and sunlight utilization, has attracted extensive attention in recent years. Based on the in-depth analysis of different photocatalysts, the spinel sulfide (CdIn2S4) and acidified g-C3N4 (ag-C3N4), which have good visible light adsorption properties, were selected to combine each other. Thus the ag-C3N4/CQDs/CdIn2S4 composite photocatalyst of CQDs-based interfacial modification (CN/CQDs/CIS) was synthesized successfully by using carbon quantum dots (CQDs) as electron transfer mediator to construct Z-scheme heterojunction. Ibuprofen was used as a typical pollutant of PPCPs to investigate the visible-light photocatalytic activity of composite. It is demonstrated the electron transfer, conversion pathways and degradation mechanism in photocatalytic process. Cyclic experiments were carried out to determine the stability of photocatslyst. The effect of different water quality conditions (pH, inorganic anion and humic acid) on the photocatalytic efficiency of composite catalyst were investigated. Major findings/conclusions of the study were as follows: (1) The ag-C3N4/CQDs/CdIn2S4 composite photocatalyst was prepared optimally. The introduction of CQDs and ag-C3N4 exhibited significantly increased visible-light absorption property, photocatalytic activity. Besides, the optimized composite catalyst has high stability. The optimized CN-2/CQDs-3/CIS composite exhibited excellent visible-light photocatalytic performance. The removal efficiencies of ibuprofen and TOC were up to 91.0% and 85.0% under 60 min, which increased by 44.1% and 48.6% compared with pure CIS, respectively. The reasons for improved photocatalytic performance of composite catalyst can be ascribed to as follows: i) the loading of CQDs greatly enhanced the visible-light adsorption ability of composite catalyst; ii) CQDs intimately connect CIS with CN by covalent bonds,which could remarkably improved the separation efficiency of photoinduced carriers. After four recycles, it still remained high removal efficiency and mineralization of ibuprofen over CN-2/CQDs-3/CIS composite. (2) According to the theory of energy band bending and fast electron transfer property of CQDs, the proposed electron migration and transformation mechanism of CN-2/CQDs-3/CIS composite is believed to follow a Z-scheme heterojunction. The experiment for visible-light-driven photocatalytic reduction of AgNO3 and calculations of density functional theory (DFT) testified that CQDs have strong ability to transfer electrons rapidly, thus insearting CQDs into catalysts facilitates greatly reduced recombination of photogenerated carriers. The photogenerated electrons in the conduction band of CIS are inclined to transfer into the CQDs due to the lower Fermi level of the CQDs (Ef=-0.08 eV) and the downward-bending conduction band of CIS. CQDs, as an excellent electronic transmission mediator, transfer the as-obtained electrons to recombine with the holes in the valence band of ag-C3N4 fleetly, subsequently leading to enhanced separation efficiency of the photogenerated electrons in the conduction band of ag-C3N4 and holes in the valence band of CIS. The photogenerated electrons and holes separated by Z-scheme heterojunction undergo a series of photochemical reactions, which generate h+、·OH and ·O2- active free radicals. The ibuprofen was degraded under the action of these active species. (3) The CN-2/CQDs-3/CIS composite exhibited good photocatalytic performance and high removal efficiency for ibuprofen at pH=5~9, while its photocatalytic activity decreased significantly under the condition of strong acid (pH=3) and alkali (pH=11). Among five common inorganic anions, HCO3- and H2PO4- showed obvious inhibition on photocatalytic activity of the catalyst, while Cl-, SO42- and NO3- had little effect on photocatalytic performance. Low concentration of humic acid (HA) had no significant effect on photocatalytic activity of whole system, but with the increase of HA concentration, inhibitory effect occurred.