Nanocomposite material from TiO2 and activated carbon for the removal of pharmaceutical product sulfamethazine by combined adsorption/photocatalysis in aqueous media
Nanocomposite material from TiO2 and activated carbon for the removal of pharmaceutical product sulfamethazine by combined adsorption/photocatalysis in aqueous media
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DOI：
10.1007/s11356-020-08939-2
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发表时间：
2020-04-29
影响因子：
5.8
通讯作者：
Rafqah, Salah
中科院分区：
文献类型：
--
作者：
Briche, Samir;Derqaoui, Mohammed;Rafqah, Salah
这项工作致力于研究以活性碳和二氧化钛为基础的新型复合材料，作为净化被药用污染物污染的水的生态解决方案。这种新型复合材料可以将吸附和光催化过程相结合，从而可以实现低成本的清洁过程，使它们成为有前途的材料。纳米二氧化钛在活性碳(AC)表面进行功能化处理，形成了纳米复合材料的核心。这是使用溶胶凝胶法完成的，摩尔比R-n(n(Ti)/n(AC))在1/10到7/10的范围内，然后进行焙烧步骤(400℃，N-2，2 h)。利用各种表征技术，证实了AC表面的功能化，并观察到以其独特的锐钛矿晶型在AC表面形成了一层TiO2膜。对磺胺二甲嘧啶类抗生素的吸附和光催化降解研究表明，最具光活性的纳米复合材料对应于R-n=0.5的纳米复合材料。Freundlich模型与实验结果吻合较好，表明吸附在吸附剂表面具有多层性质，吸附在其表面的污染物之间存在相互作用。光催化降解溶液中残留的药物污染物，主要是通过光催化剂激发形成的羟基自由基来进行的。LC/MS分析表明，产物的形成意味着磺酰胺桥的断裂，以及芳香环和嘧啶基团的羟基化。
This work was dedicated to the elaboration of new composite materials based on activated carbon and titanium oxide as an ecological solution for the cleaning of water contaminated with pharmaceutical pollutants. Such new composite materials allowed the combining of adsorption and photocatalytic process, which allows a cleaning process that is low cost making them promising materials. The functionalization of the surface of activated carbon (AC) by TiO2 nanoparticles forms the core of the nanocomposite material. This was accomplished using sol-gel process with molar ratios R-n (n(Ti)/n(AC)) in the range of 1/10 to 7/10 followed by a calcination step (400 degrees C, N-2, 2 h). Using various characterization techniques, AC surface functionalization was confirmed and the formation of a TiO2 coating on the AC was noticed with TiO2 under its unique anatase crystallographic form. The study of adsorption and photocatalytic degradation of the sulfamethazine antibiotic demonstrated that the most photoactive nanocomposite corresponds to the one with R-n = 0.5. Freundlich model was proved to be a perfect fit with the experimental results stating that the adsorption is of multilayer nature on the surface of the adsorbent and with interactions between the pollutants adsorbed on its surface. The photocatalytic degradation of the remaining pharmaceutical pollutant in the solution was evidenced and essentially occurred through the involvement of hydroxyl radicals formed by the excitation of the photocatalyst. The formation of the photoproducts analyzed by the LC/MS technique implies the splitting of the sulfonamide bridge, and by the hydroxylation of the aromatic ring and the pyrimidine group.