We report a rapid, robust and efficient technique for the fabrication of poly(methyl methacrylate) based microreactors using laser engraver to synthesize ZnS quantum dots. We also present a comparative study of synthesis and photocatalytic activity of ZnS quantum dots by conventional beaker reactor and microfluidic route. The ZnS synthesized in a microfluidic reactor revealed the formation of well dispersed quantum dots with uniform size of 2.51 nm and higher band gap (4.12 eV) as compared to the quantum dots prepared by beaker reactor method. In comparison to the degradation profile in a conventional bulk reactor, a remarkable enhancement in the photocatalytic activity of ZnS quantum dots in microfluidic reactor has also been observed for degradation of organic dyes (Rhodamine B and Methyl orange) under UV irradiation. The degradation efficiency of ZnS can further be tuned by controlling flow rate of dyes through the photocatalyst coated micro-reactor. Instant degradation with efficiency of 93% and 99% for rhodamine B and methyl orange respectively, were achieved when the flow rate was maintained at 50 μl min⁻¹. The microfluidic reactor also offers the prolonged photocatalyst stability, ensuring its reusability without significantly losing its efficiency. The ZnS quantum dots were also observed to have excellent antibacterial property thus inhibiting the growth of E. coli bacterial colonies even at a very low concentration of 10 μg ml⁻¹.

我们报告使用激光雕刻机合成ZnS量子点的聚（甲基丙烯酸甲酯）基微反应器的制造快速，健壮和有效的技术。我们还提供了常规烧杯反应器和微流控路线对ZnS量子点的合成和光催化活性的比较研究。与通过烧杯反应器方法制备的量子点相比，在微流体反应器中合成的ZnS形成了均匀分散的具有2.51 nm尺寸和更高的带隙（4.12 eV）的量子点。与常规本体反应器中的降解曲线相比，微流反应器中ZnS量子点的光催化活性也得到了显着提高，可用于紫外线照射下有机染料（若丹明B和甲基橙）的降解。可以通过控制染料通过光催化剂涂覆的微反应器的流速来进一步调节ZnS的降解效率。当流速保持在50时，若丹明B和甲基橙的即时降解效率分别为93％和99％μ升分钟^-1。微流体反应器还提供了延长的光催化剂稳定性，确保了其可重复使用性，而不会显着降低其效率。硫化锌量子点也观察到具有从而抑制生长良好抗菌性的大肠杆菌即使在10非常低浓度的细菌菌落μ克毫升^-1。