The morphology of a series of Bi–B co-doped titanium oxide photocatalysts and its optical properties were characterized. The results suggested that boron and bismuth as co-dopants were incorporated into the framework of titanium matrix. For the B and Bi-doped TiO₂ samples, surface area decreased while the Bi content increased. Based on the photoluminescence spectra, a decrease in recombination rate of photogenerated carriers was observed with the increasing amount from 0.5 to 3 mol% of Bi in Bi–B–TiO₂ composites. The most active photocatalyst in 5-fluorouracil (5-FU) photodegradation was 3 mol% of Bi in Bi–B–TiO₂. The effects of operating parameters: pH, drug concentration and natural organic matter presence (NOM) in the effluent from wastewater treatment plant, were investigated. The highest efficiency of 5-FU photodegradation was observed at neutral pH for the drug concentration equal to 1 mg/L and photocatalyst of 0.05 g/L. While in distilled water solutions, the catalyst showed good removal efficiency of the drug, the process was totally inhibited by NOM in the complex matrix which was the treated sewage, what could be connected with the internal filter and scavenging effect. Based on the identification of organic and inorganic by-products of the photooxidation, the pathway of 5-FU degradation was proposed. The mineralization was poor (5–7%) in the case of both 3Bi–B–TiO₂ and pure TiO₂ for the drug of 50 mg/L, but photocatalytic oxidation of drug led to non-toxic products toward Lemma minor.

中文翻译：

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Bi-B共掺杂TiO 2在人工阳光下在水环境中光催化降解5-氟尿嘧啶

表征了一系列Bi-B共掺杂二氧化钛光催化剂的形貌及其光学性质。结果表明，硼和铋作为共掺杂剂被掺入钛基体的骨架中。对于B和Bi掺杂的TiO ₂样品，表面积减小而Bi含量增加。根据光致发光光谱，观察到随着Bi–B–TiO ₂复合材料中Bi的含量从0.5 mol％增加到3 mol％，光生载流子的复合率降低。5-氟尿嘧啶（5-FU）光降解中活性最高的光催化剂是Bi–B–TiO ₂中Bi的3 mol％。研究了废水，污水处理厂废水中操作参数的影响：pH，药物浓度和天然有机物的存在（NOM）。当药物浓度等于1 mg / L和光催化剂为0.05 g / L时，在中性pH下观察到5-FU光降解的最高效率。而在蒸馏水溶液中，催化剂显示出良好的药物去除效率，该过程被复杂基质中的NOM完全抑制，该基质是处理后的污水，这可能与内部过滤器和清除效果有关。在鉴定光氧化有机和无机副产物的基础上，提出了5-FU降解的途径。对于3Bi–B–TiO ₂和纯TiO ₂而言，矿化作用很差（5-7％）对于50 mg / L的药物而言，但该药物的光催化氧化导致对未成年人Lemma的无毒产物。