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Investigation of the photocatalytic potential enhancement of silica monolith decorated tin oxide nanoparticles through experimental and theoretical studies
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2020-07-13 , DOI: 10.1039/d0nj00996b Idrees Khan 1, 2, 3, 4 , Adnan Ali Khan 1, 3, 4, 5 , Ibrahim Khan 6, 7, 8, 9 , Muhammad Usman 7, 8, 9, 10 , Muhammad Sadiq 1, 3, 4, 5 , Faiz Ali 1, 3, 4, 5 , Khalid Saeed 1, 2, 3, 4
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2020-07-13 , DOI: 10.1039/d0nj00996b Idrees Khan 1, 2, 3, 4 , Adnan Ali Khan 1, 3, 4, 5 , Ibrahim Khan 6, 7, 8, 9 , Muhammad Usman 7, 8, 9, 10 , Muhammad Sadiq 1, 3, 4, 5 , Faiz Ali 1, 3, 4, 5 , Khalid Saeed 1, 2, 3, 4
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Photodegradation of organic pollutants is considered to be the most suitable and cheaper technique to counter decontamination issues. Metal nanoparticles are considered the most effective heterogeneous photocatalysts for photodegradation of organic pollutants, but neat nanoparticles agglomerate in the reaction medium and display less photocatalytic efficiency. Herein, silica monolith particles (SiO2) were synthesized and utilized as a support medium for the synthesis of SnO2 nanoparticles to retard their agglomeration. Silica-supported tin oxide nanoparticles (SnO2/SiO2 NPs) and neat tin oxide nanoparticles (SnO2 NPs) were prepared through chemical reduction method and characterized by AFM, SEM, TEM, EDX and mapping, XRD, FTIR and zeta sizer. Morphological and mapping analyses revealed that SiO2 increases the surface area of SnO2 NPs and magnificently enhances their photocatalytic activity. The neat SnO2 NPs are highly agglomerated and hence show less photocatalytic activity. XRD and FTIR analyses confirm the synthesis of SnO2 NPs. The neat SnO2 NPs have a PDI of 0.51, which reveal much variation in the particles’ size and have a surface charge of −11.2 ± 0.87 mV, which is not enough for the NPs’ repulsion in suspended form and hence are agglomerated. The SnO2/SiO2 NPs degraded about 94.58% and 93.73% orange II (O II) dye while SnO2 NPs degraded 65.93% and 46.11% dye within 30 min irradiation under UV and visible light respectively. The enhanced photocatalytic activity of SnO2/SiO2 NPs is due to the synergistic effect of rapid adsorption followed by drastic photodegradation of dye. The SnO2/SiO2 NPs are much more sustainable than SnO2 NPs due to easy recycling and washing and the recovered SnO2/SiO2 NPs degraded about 83.38% of dye while SnO2 degraded 21.91% within 30 min. In addition, the density functional theory (DFT) calculations show that the SnO2/SiO2 NPs have greater adsorption capacity then pristine SiO2 and SnO2 surfaces, having shorter binding distances, a larger Eads value (4.29 eV) and a larger reduction in band gap.
中文翻译：
通过实验和理论研究研究二氧化硅整体装饰的氧化锡纳米粒子的光催化电势增强
光解有机污染物被认为是解决去污问题的最合适，最便宜的技术。金属纳米颗粒被认为是有机污染物光降解的最有效的非均相光催化剂，但是纯净的纳米颗粒在反应介质中聚集并且显示出较低的光催化效率。在此，合成了二氧化硅整体颗粒（SiO 2），并用作合成SnO 2纳米颗粒以阻止其团聚的载体。二氧化硅负载的氧化锡纳米颗粒（SnO 2 / SiO 2 NPs）和纯净的氧化锡纳米颗粒（SnO 2NPs是通过化学还原法制备的，并通过AFM，SEM，TEM，EDX和作图，XRD，FTIR和zeta sizer进行表征。形态学和作图分析表明，SiO 2增加了SnO 2 NPs的表面积，并极大地增强了它们的光催化活性。纯净的SnO 2 NP高度聚集，因此显示较少的光催化活性。XRD和FTIR分析证实了SnO 2 NP的合成。纯净的SnO 2 NP的PDI为0.51，表明颗粒尺寸变化很大，并且表面电荷为-11.2±0.87 mV，这不足以使NP悬浮形式的排斥，因此会聚结。SnO 2 / SiO 2NPs降解了约94.58％和93.73％的橙色II（O II）染料，而SnO 2 NPs分别在30分钟的紫外线和可见光照射下降解了65.93％和46.11％的染料。SnO 2 / SiO 2 NPs的增强的光催化活性归因于快速吸附和随后染料的剧烈光降解的协同作用。所述的SnO 2 /二氧化硅2的NP比的SnO更加可持续2周的NP由于易于回收和洗涤，并将回收的SnO 2 /二氧化硅2的NP降解约染料的83.38％，而的SnO 2在30分钟内降解21.91％。此外，密度泛函理论（DFT）计算表明SnO 2/ SiO 2 NPs比原始的SiO 2和SnO 2表面具有更大的吸附能力，具有更短的结合距离，更大的E ads值（4.29 eV）和更大的带隙减小。
更新日期：2020-08-11
中文翻译：
通过实验和理论研究研究二氧化硅整体装饰的氧化锡纳米粒子的光催化电势增强
光解有机污染物被认为是解决去污问题的最合适，最便宜的技术。金属纳米颗粒被认为是有机污染物光降解的最有效的非均相光催化剂，但是纯净的纳米颗粒在反应介质中聚集并且显示出较低的光催化效率。在此，合成了二氧化硅整体颗粒（SiO 2），并用作合成SnO 2纳米颗粒以阻止其团聚的载体。二氧化硅负载的氧化锡纳米颗粒（SnO 2 / SiO 2 NPs）和纯净的氧化锡纳米颗粒（SnO 2NPs是通过化学还原法制备的，并通过AFM，SEM，TEM，EDX和作图，XRD，FTIR和zeta sizer进行表征。形态学和作图分析表明，SiO 2增加了SnO 2 NPs的表面积，并极大地增强了它们的光催化活性。纯净的SnO 2 NP高度聚集，因此显示较少的光催化活性。XRD和FTIR分析证实了SnO 2 NP的合成。纯净的SnO 2 NP的PDI为0.51，表明颗粒尺寸变化很大，并且表面电荷为-11.2±0.87 mV，这不足以使NP悬浮形式的排斥，因此会聚结。SnO 2 / SiO 2NPs降解了约94.58％和93.73％的橙色II（O II）染料，而SnO 2 NPs分别在30分钟的紫外线和可见光照射下降解了65.93％和46.11％的染料。SnO 2 / SiO 2 NPs的增强的光催化活性归因于快速吸附和随后染料的剧烈光降解的协同作用。所述的SnO 2 /二氧化硅2的NP比的SnO更加可持续2周的NP由于易于回收和洗涤，并将回收的SnO 2 /二氧化硅2的NP降解约染料的83.38％，而的SnO 2在30分钟内降解21.91％。此外，密度泛函理论（DFT）计算表明SnO 2/ SiO 2 NPs比原始的SiO 2和SnO 2表面具有更大的吸附能力，具有更短的结合距离，更大的E ads值（4.29 eV）和更大的带隙减小。
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