Due to the high pollution caused by several molecules, it is necessary to develop efficient materials to degrade these contaminants. Activated carbons (ACs) are exceptional and versatile adsorbents, and titanium dioxide (TiO) has remarkable photocatalytic properties. The combination of activated carbon (AC) and TiO provides a system capable of simultaneously adsorbing and degrading several emerging contaminants. This study presents a new absorbent/photocatalyst material by modifying the AC with ethylenediamine (ET) and impregnated with TiO (AC-ET/TiO). AC modified with amine groups keeps the TiO nanoparticles more bound onto its surface. A study exploring the dispersion onto the surface of unmodified AC revealed that the material lacked stability, releasing TiO particles into the solution. The characterization by nitrogen adsorption/desorption isotherms showed a mesoporous material that can have a synergic effect between the adsorption and photocatalysis. The photocatalyst was analyzed by field emission gun scanning electron microscopy (FEG-SEM) and demonstrated the presence of TiO dispersed on the surface. The AC-ET/TiO exhibited an improved photodegradation of sulfamethazine (SMT), superior to the commercial TiO – P25, by removing more than 90% of the SMT in 2 h of UV light irradiation. The reuse of the AC-ET/90TiO showed that this material is active after three photoreactions. In conclusion, amino groups insertion into AC is essential for the stability of the TiO on the surface. Besides, this material has increased photocatalytic activity with speedy degradation of SMT.

中文翻译：

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乙二胺改性活性炭光催化剂，具有最高的 TiO2 附着/分散性，可改善磺胺二甲嘧啶的光降解

由于多种分子造成的高污染，因此有必要开发有效的材料来降解这些污染物。活性炭 (AC) 是特殊且多功能的吸附剂，二氧化钛 (TiO) 具有卓越的光催化性能。活性炭 (AC) 和 TiO 的结合提供了一个能够同时吸附和降解多种新兴污染物的系统。本研究通过用乙二胺 (ET) 改性 AC 并用 TiO 浸渍 (AC-ET/TiO) 提出了一种新型吸收剂/光催化剂材料。用胺基团改性的 AC 可以使 TiO 纳米粒子更好地结合在其表面上。一项探索未改性活性炭表面分散情况的研究表明，该材料缺乏稳定性，会将 TiO2 颗粒释放到溶液中。氮气吸附/解吸等温线的表征表明，介孔材料可以在吸附和光催化之间产生协同效应。通过场发射枪扫描电子显微镜（FEG-SEM）对光催化剂进行分析，并证明表面存在分散的 TiO2。 AC-ET/TiO 对磺胺二甲嗪 (SMT) 的光降解性能优于商用 TiO - P25，在 2 小时的紫外光照射下去除了 90% 以上的 SMT。 AC-ET/90TiO 的重复使用表明该材料在三次光反应后具有活性。总之，AC 中氨基的插入对于 TiO 表面的稳定性至关重要。此外，该材料还提高了光催化活性，可快速降解SMT。