A green and energy-efficient photocatalytic process for the accelerated synthesis of lactic acid esters using functionalized quantum dots,Reaction Chemistry & Engineering

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A green and energy-efficient photocatalytic process for the accelerated synthesis of lactic acid esters using functionalized quantum dots
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2021-3-11 , DOI: 10.1039/d1re00017a
Priyanka Verma _{1,

2,

3,

4} , Ravinder Kumar Wanchoo _{1,

2,

3,

4} , Amrit Pal Toor _{1,

2,

3,

4,

5}

Affiliation

Sulphonate-grafted-titania (SO₃H–TiO₂) quantum dot catalyzed photochemical process offered an energy-efficient, accelerated, and safe approach to synthesize lactic acid esters at ambient temperature conditions. This low-temperature route, conceived in line with green ideas, involves the preparation of a metal oxide-based framework followed by surface grafting using sulphonate groups. These sulphonate grafts, which are characterized using spectroscopy and electron microscopy, decrease the propensity for acid absorption by the bare quantum dot material, which also credits enormous photo-action for lactic acid transformation into lactates. Mechanistically sulphonate species get energized by capturing an electron excited by titania under UV irradiation, consequently stimulating the adsorbed lactic acid molecules. The excess reagent methanol works alongside as a hole-scavenger and was excited to form methoxide ion combining to activate lactic acid-producing desired ester. After a parametric sway, a significant 91 percent methyl lactate yield was obtained at the optimized catalytic catalyst dose of 0.05 g ml⁻¹ and the initial feed ratio of 1 : 10 (lactic acid to alcohol) culminating in no major structural alteration even after many catalytic cycles. Reaction data were modeled using second-order kinetics and the forward rate constant was found to be 9.2 × 10⁻³ L mol min⁻¹. This developed method demonstrated that one can fabulously succeed the traditional homogeneous, thermal heterogeneous, and enzymatic approaches that require high energy, time, and solvent requirements.

中文翻译：

使用功能化量子点加速合成乳酸酯的绿色高效节能光催化工艺

磺酸盐接枝的二氧化钛（SO ₃ H–TiO ₂）量子点催化的光化学过程提供了一种在环境温度条件下合成乳酸酯的节能，快速，安全的方法。根据绿色理念构想的这种低温路线涉及制备基于金属氧化物的骨架，然后使用磺酸盐基团进行表面接枝。这些使用光谱学和电子显微镜表征的磺酸盐接枝物降低了裸量子点材料吸收酸的倾向，这也归功于巨大的光化学作用，可将乳酸转化为乳酸。通过在紫外线辐射下捕获由二氧化钛激发的电子，可以使机械上的磺酸盐物质激发能量，从而刺激所吸附的乳酸分子。过量的试剂甲醇同时作为空穴清除剂起作用，并被激发形成甲醇盐离子，从而活化生成乳酸的所需酯。经过参数摆幅后，在优化的催化催化剂剂量为0.05 g / ml时，可获得91％的乳酸甲酯显着收率^-1和1:10的初始进料比（乳酸与醇）即使经过许多次催化循环也没有重大结构变化。使用二级动力学对反应数据进行建模，发现正向速率常数为9.2×10^-3 L mol min^-1。这种发达的方法表明，可以很好地继承传统的均相，热异质和酶促方法，这些方法需要大量的能量，时间和溶剂。

更新日期：2021-03-30

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