Department of Energy Science, Alagappa University, Karaikudi, India.
Department of Energy Science, Alagappa University, Karaikudi, India; Department of Microbiology, Alagappa University, Karaikudi, India.
J Photochem Photobiol B. 2019 Apr;193:118-130. doi: 10.1016/j.jphotobiol.2019.02.011. Epub 2019 Feb 27.
TiO-ZnO heterogeneous catalytic system provides a good replacement of a homogeneous catalytic reaction due to its easier recovery. In this study, biodiesel was produced from Ulva lactuca seaweeds using TiO-ZnO nanocomposite catalysts with particle size of ~12 nm. The size controlled TiO-ZnO nanocomposite was characterized by powder XRD analysis and TEM. The result of that TiO-ZnO catalyst is a promising catalyst for the production of biodiesel under mild reaction conditions and high yield of hydroxydecanoic acid conversion of 82.8%. The various conditions optimized for the higher conversion to FAME (15.8 ml of FAME) were 4 wt% catalysts at 4 h under 60 °C and further there is no increase of conversion to FAME above 60 °C-80 °C. The total product yield was calculated as 82.8% of conversion to FAME. The evaluated biodiesel was found to be up to the mark of ASTM standards. The silver nanoparticles (AgNPs) were synthesized by using leftover biomass of algae obtaining after lipid extraction of U.lactuca. AgNPs particle size was achieved as ~12 nm and was confirmed by UV-Visible spectroscopy, XRD and TEM analysis. Antibacterial activities of the synthesized AgNPs were analyzed and compared. The antibacterial activity was excellent against bacterial pathogens and treatment against P. vulgaris shows the maximum zone of inhibition (13.8 mm). The present work identified that the unutilized bioresource such as U.lactuca can be effectively utilized for biodiesel production so as to replace fossil fuel usage.
TiO-ZnO 多相催化体系由于易于回收，因此是均相催化反应的良好替代品。本研究采用粒径约为 12nm 的 TiO-ZnO 纳米复合材料催化剂从浒苔中生产生物柴油。通过粉末 XRD 分析和 TEM 对尺寸可控的 TiO-ZnO 纳米复合材料进行了表征。结果表明，TiO-ZnO 催化剂是一种很有前途的催化剂，可在温和的反应条件下和 82.8%的羟基癸酸转化率下高效生产生物柴油。为了提高 FAME（15.8ml FAME）的转化率，优化了各种条件，最佳条件为 4wt%的催化剂在 60°C 下反应 4 小时，在 60°C-80°C 以上进一步提高 FAME 的转化率没有增加。总产物收率计算为 FAME 转化率的 82.8%。评估的生物柴油符合 ASTM 标准。银纳米粒子（AgNPs）是通过从浒苔中提取脂质后剩余的藻类生物质合成的。AgNPs 的粒径约为 12nm，并通过紫外可见光谱、XRD 和 TEM 分析得到证实。分析并比较了合成的 AgNPs 的抗菌活性。抗菌活性对细菌病原体非常有效，对 P. vulgaris 的治疗显示出最大的抑菌圈（13.8mm）。本研究表明，浒苔等未充分利用的生物资源可以有效地用于生产生物柴油，从而替代化石燃料的使用。
