A green approach: scalable dry media synthesis of a γ-TaON photocatalyst for solar H2 production and rhodamine B degradation,Sustainable Energy & Fuels

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A green approach: scalable dry media synthesis of a γ-TaON photocatalyst for solar H2 production and rhodamine B degradation
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-06-29 , DOI: 10.1039/d0se00791a
Supriya K. Khore _{1,

2,

3,

4} , Sunil R. Kadam _{5,

6,

7,

8} , Bharat B. Kale _{1,

2,

3,

4} , Ravindra S. Sonawane _{1,

2,

3,

4}

Affiliation

Extending the light absorption range and facilitating the separation of photo-induced charge carriers are effective strategies to improve the performance of the photocatalytic process. Here, we report a new, scalable and low temperature solid state method for the synthesis of different TaON polymorphs. Tantalum oxynitride (TaON), a visible light active photocatalyst, was investigated for photocatalytic H₂ production as well as degradation of Rhodamine B under artificial solar light (Xe lamp) and natural sunlight. XPS confirms substitutional (N_s) as well as interstitial (N_i) nitrogen incorporation into the Ta₂O₅ lattice. Optical characterization reveals a red shift in absorption from the UV to visible region for TaON samples. XRD confirms the crystalline phase of different polymorphs of TaON such as γ, β etc. The results of the photocatalytic activity of the synthesized catalysts for hydrogen (H₂) production via H₂O splitting and degradation of the Rhodamine B pollutant show that among the series of synthesized catalysts, the pure γ-TaON phase displays the highest H₂ production of 1393.6 μmol per 0.1 g per hour under natural solar light, whereas under similar experimental conditions 833.6 μmol per 0.1 g hour under a xenon lamp using triethanolamine as a sacrificial electron donor is observed. Likewise, the synthesized γ-TaON photocatalyst decomposes 99.8% of 10 ppm Rhodamine B solution in just 100 min under natural solar light.

中文翻译：

绿色方法：可扩展的干法合成γ-TaON光催化剂，用于产生太阳能H2和若丹明B降解

扩大光吸收范围并促进光诱导载流子的分离是提高光催化过程性能的有效策略。在这里，我们报告了一种新的，可扩展的低温固态方法，用于合成不同的TaON多晶型物。研究了可见光活性光催化剂氧氮化钽（TaON）的光催化H ₂生成以及在人工太阳光（氙灯）和自然阳光下降解罗丹明B的能力。XPS证实了置换（N _s）和间隙（N _i）氮已掺入Ta ₂ O _5中格子。光学表征显示TaON样品的吸收从紫外到可见光区域发生红移。XRD证实了TaON的不同多晶型（如γ，β等）的晶相。合成的催化剂通过H ₂ O裂解和罗丹明B污染物的降解产生氢气（H ₂）的光催化活性的结果表明，系列合成催化剂，纯的γ-TaON相显示出最高的H ₂在自然太阳光下，每0.1 g每小时可产生1393.6μmol/小时，而在类似的实验条件下，使用三乙醇胺作为牺牲电子供体的氙气灯下，每0.1 g每小时可产生833.6μmol/小时。同样，合成的γ-TaON光催化剂在自然光下仅用100分钟即可分解99.8％的10 ppm罗丹明B溶液。

更新日期：2020-08-25

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