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首页> 外文期刊>RSC Advances >A novel multifunctional Ag and Sr2+ co-doped TiO2@rGO ternary nanocomposite with enhanced p-nitrophenol degradation, and bactericidal and hydrogen evolution activity
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A novel multifunctional Ag and Sr2+ co-doped TiO2@rGO ternary nanocomposite with enhanced p-nitrophenol degradation, and bactericidal and hydrogen evolution activity

机译：一种新型的多功能Ag和Sr2 +共掺杂的TiO2 @ rGO三元纳米复合材料，具有增强的对硝基苯酚降解，杀菌和析氢活性

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In the present study, a novel multifunctional Sr ~(2+) /Ag–TiO _(2) @rGO ternary hybrid photocatalyst was prepared via facile sol–gel and hydrothermal methods. The prepared catalyst was well characterized by UV-vis, XRD, Raman, HRTEM and XPS. The synthesized composite was utilised for p -NP degradation, E. coli disinfection and H _(2) generation under visible light. The Sr ~(2+) /Ag–TiO _(2) @rGO catalyst showed enhanced photocatalytic H _(2) evolution rate (64.3 μmol h ~(?1) ) compared with Ag–TiO _(2) @rGO (30.1 μmol h ~(?1) ) and TiO _(2) (no activity). Nearly complete degradation of 15 mg l ~(?1) p -NP was achieved over Sr ~(2+) /Ag–TiO _(2) @rGO after 3 h, while only 66% and 5% was achieved by Ag–TiO _(2) @rGO and TiO _(2) respectively. Furthermore, TEM analysis was carried out on Escherichia coli ( E. coli ) before and after visible light irradiation to understand the inactivation mechanism and DNA analysis indicated no fragmentation during inactivation. Radical quantification experiments and ESR analysis suggested that ·OH and O _(2) ˙ ~(?) were the main ROS in the degradation and disinfection processes. The superior photocatalytic H _(2) evolution rate of Sr ~(2+) /Ag–TiO _(2) @rGO was attributed to the synergetic effect between the Ag, Sr ~(2+) and TiO _(2) components on the rGO surface. The localized SPR effect of Ag induced visible light generated charge carriers into the conduction band of the TiO _(2) and Sr ~(2+) which further transfer to the rGO for the reduction of H ~(+) ions into H _(2) . The results suggest that Sr ~(2+) /Ag–TiO _(2) @rGO structures could not only induce separation and migration efficiency of charge carries, but also improve charge collection efficiency for enhanced catalytic activity. Thus, we believe that this work could provide new insights into multifunctional nanomaterials for applications in solar photocatalytic degradation of harmful organics and pathogenic bacteria with clean energy generation during wastewater treatment.
机译：在本研究中，通过简便的溶胶-凝胶法和水热法制备了新型多功能Sr〜（2+）/ Ag-TiO _（2）@rGO三元杂化光催化剂。通过UV-vis，XRD，拉曼，HRTEM和XPS对制备的催化剂进行了很好的表征。合成的复合物在可见光下用于p -NP降解，大肠杆菌消毒和H_（2）生成。与Ag–TiO _（2）@rGO（）相比，Sr〜（2+）/ Ag-TiO _（2）@rGO催化剂显示出更高的光催化H _（2）析出速率（64.3μmolh〜（？1））。 30.1μmol·h〜（η1））和TiO_（2）（无活性）。 3h后，在Sr〜（2+）/ Ag-TiO _（2）@rGO上，几乎完全降解了15 mg l〜（？1）p -NP，而Ag–仅达到66％和5％。 TiO _（2）@rGO和TiO _（2）。此外，在可见光照射之前和之后在大肠杆菌（E.coli）上进行TEM分析以了解灭活机理，并且DNA分析表明灭活过程中没有碎片。自由基定量实验和ESR分析表明，·OH和O _（2）˙〜（？）是降解和消毒过程中的主要ROS。 Sr〜（2+）/ Ag–TiO _（2）@rGO的优异的光催化H _（2）演化速率归因于Ag，Sr〜（2+）和TiO _（2）组分之间的协同作用在rGO表面上。 Ag诱导的可见光的局部SPR效应将电荷载流子带入TiO _（2）和Sr〜（2+）的导带中，并进一步转移到rGO中，以将H〜（+）离子还原成H _（ 2）。结果表明，Sr〜（2+）/ Ag-TiO _（2）@rGO结构不仅可以诱导电荷载流子的分离和迁移效率，而且可以提高电荷收集效率以增强催化活性。因此，我们相信这项工作可以为多功能纳米材料提供新的见解，这些多功能纳米材料可在废水处理过程中利用清洁能源在太阳能光催化降解有害有机物和病原细菌中应用。

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