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Plasmonic silver nanoparticles decorated surface functionalized Zirconia Doped quantum dots - for enhanced photochemical synthesis of lactic acid esters
Chemical Engineering Journal ( IF 15.1 ) Pub Date : 2021-09-21 , DOI: 10.1016/j.cej.2021.132550
Priyanka Verma 1 , Ravinder Kumar Wanchoo 1 , Amrit Pal Toor 1, 2
Affiliation  

Lactic acid, or 2-hydroxypropionic acid (CAS 50-21-5), a natural organic acid immensely engaged in agricultural industry, pharmacy, garment and chemical industry with a long history of practice. Lactic acid generated in fermentation necessitates an extra purification step that must be cost-effective. A green and energy derivatization of lactic acid into corresponding esters was carried out under photocatalytic conditions in this study to render them volatile for distillation separation. Esterification reaction was carried out under low energy photocatalytic system under solvent free conditions using a range of Zirconium impregnated-activated Titanium dioxide photocatalysts (1-0.005Ag/1.9-4.4%S-2.5-12.5%Zr@TO). Both physical and chemical events in the reaction grid have been studied and thermodynamic and kinetic parameters have been established expending pseudo-homogeneous (PH), Eley-Rideal (ER) and Langmuir-Hinshelwood-Haugen-Watson (LHHW) models and the different adsorption of components were proposed to fit the intrinsic kinetic data. Reaction mechanism for the process have been proposed based on the kinetic modelling results as well as FT-IR, TGA, Ammonia-TPD and photo-Electrochemical characterizations, as well as radical trapping tests, were also used to effectively support the reaction mechanism. The findings will be beneficial in the design of industrial photo-reactors for low temperature ester synthesis strategies.



中文翻译:

等离子银纳米粒子装饰表面功能化氧化锆掺杂量子点 - 用于增强乳酸酯的光化学合成

乳酸,又称2-羟基丙酸(CAS 50-21-5),一种天然有机酸,在农业、制药、服装和化工行业有着悠久的实践历史。发酵中产生的乳酸需要额外的纯化步骤,必须具有成本效益。本研究在光催化条件下将乳酸绿色和能量衍生化为相应的酯,使它们具有挥发性以进行蒸馏分离。使用一系列锆浸渍活化二氧化钛光催化剂(1-0.005Ag/1.9-4.4%S-2.5-12.5%Zr@TO)在无溶剂条件下在低能光催化体系下进行酯化反应。研究了反应网格中的物理和化学事件,并建立了热力学和动力学参数,扩展了拟均相 (PH)、Eley-Rideal (ER) 和 Langmuir-Hinshelwood-Haugen-Watson (LHHW) 模型以及不同的吸附提出了适合固有动力学数据的组分。基于动力学建模结果以及 FT-IR、TGA、Ammonia-TPD 和光电化学表征以及自由基捕获测试,已经提出了该过程的反应机理,也用于有效支持反应机理。这些发现将有助于设计用于低温酯合成策略的工业光反应器。提出了 Eley-Rideal (ER) 和 Langmuir-Hinshelwood-Haugen-Watson (LHHW) 模型以及组分的不同吸附来拟合内在动力学数据。基于动力学建模结果以及 FT-IR、TGA、Ammonia-TPD 和光电化学表征以及自由基捕获测试,已经提出了该过程的反应机理,也用于有效支持反应机理。这些发现将有助于设计用于低温酯合成策略的工业光反应器。提出了 Eley-Rideal (ER) 和 Langmuir-Hinshelwood-Haugen-Watson (LHHW) 模型以及组分的不同吸附来拟合内在动力学数据。基于动力学建模结果以及 FT-IR、TGA、Ammonia-TPD 和光电化学表征以及自由基捕获测试,已经提出了该过程的反应机理,也用于有效支持反应机理。这些发现将有助于设计用于低温酯合成策略的工业光反应器。也被用来有效地支持反应机制。这些发现将有助于设计用于低温酯合成策略的工业光反应器。也被用来有效地支持反应机制。这些发现将有助于设计用于低温酯合成策略的工业光反应器。

更新日期:2021-09-21
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