Bloch Khalida, Mohammed Shahansha M, Karmakar Srikanta, Shukla Satyajit, Asok Adersh, Banerjee Kaushik, Patil-Sawant Reshma, Mohd Kaus Noor Haida, Thongmee Sirikanjana, Ghosh Sougata
Department of Microbiology, School of Science, RK University, Rajkot, Gujarat, India.
Functional Materials Section (FMS), Materials Science and Technology Division (MSTD), CSIR-National Institute for Interdisciplinary Science and Technology (NIIST), Council of Scientific and Industrial Research (CSIR), Thiruvananthapuram, Kerala, India.
Front Chem. 2022 Oct 31;10:1013077. doi: 10.3389/fchem.2022.1013077. eCollection 2022.
Phytofabrication of the nanoparticles with exotic shape and size is an attractive area where nanostructures with noteworthy physicochemical and optoelectronic properties that can be significantly employed for photocatalytic dye degradation. In this study a medicinal plant, leaf extract (PALE) was used to synthesize zinc oxide particles (ZnOPs) and silver mixed zinc oxide particles (ZnOAg1Ps, ZnOAg10Ps, ZnO10Ag1Ps) by varying the concentration of the metal precursor salts, i.e. zinc acetate and silver nitrate. The PALE showed significantly high concentrations of polyphenols, flavonoids, reducing sugar, starch, citric acid and plumbagin up to 314.3 ± 0.33, 960.0 ± 2.88, 121.3 ± 4.60, 150.3 ± 3.17, 109.4 ± 2.36, and 260.4 ± 8.90 μg/ml, respectively which might play an important role for green synthesis and capping of the phytogenic nanoparticles. The resulting particles were polydispersed which were mostly irregular, spherical, hexagonal and rod like in shape. The pristine ZnOPs exhibited a UV absorption band at 352 nm which shifted around 370 in the Ag mixed ZnOPs with concomitant appearance of peaks at 560 and 635 nm in ZnO10Ag1Ps and ZnOAg1Ps, respectively. The majority of the ZnOPs, ZnOAg1Ps, ZnOAg10Ps, and ZnO10Ag1Ps were 407, 98, 231, and 90 nm in size, respectively. Energy dispersive spectra confirmed the elemental composition of the particles while Fourier transform infrared spectra showed the involvement of the peptide and methyl functional groups in the synthesis and capping of the particles. The composites exhibited superior photocatalytic degradation of methylene blue dye, maximum being 95.7% by the ZnOAg10Ps with a rate constant of 0.0463 s following a first order kinetic model. The present result clearly highlights that Ag mixed ZnOPs synthesized using leaf extract (PALE) can play a critical role in removal of hazardous dyes from effluents of textile and dye industries. Further expanding the application of these phytofabricated composites will promote a significant complementary and alternative strategy for treating refractory pollutants from wastewater.
利用药用植物制备具有奇异形状和尺寸的纳米颗粒是一个极具吸引力的领域，其中具有显著物理化学和光电特性的纳米结构可有效地用于光催化降解染料。在本研究中，使用一种药用植物的叶提取物（PALE），通过改变金属前驱体盐（即醋酸锌和硝酸银）的浓度来合成氧化锌颗粒（ZnOPs）以及银混合氧化锌颗粒（ZnOAg1Ps、ZnOAg10Ps、ZnO10Ag1Ps）。PALE显示出显著高浓度的多酚、黄酮类化合物、还原糖、淀粉、柠檬酸和白花丹素，分别高达314.3±0.33、960.0±2.88、121.3±4.60、150.3±3.17、109.4±2.36和260.4±8.90μg/ml，这可能在植物源纳米颗粒的绿色合成和包覆过程中发挥重要作用。所得到的颗粒多分散，形状大多为不规则、球形、六边形和棒状。原始的ZnOPs在352nm处呈现紫外吸收带，在银混合的ZnOPs中该吸收带移至约370nm，同时在ZnO10Ag1Ps和ZnOAg1Ps中分别在560和635nm处出现峰。大多数的ZnOPs、ZnOAg1Ps、ZnOAg10Ps和ZnO10Ag1Ps的尺寸分别为407、98、231和90nm。能量色散光谱证实了颗粒的元素组成，而傅里叶变换红外光谱表明肽和甲基官能团参与了颗粒的合成和包覆。这些复合材料对亚甲基蓝染料表现出优异的光催化降解性能，其中ZnOAg10Ps的降解率最高，为95.7%，遵循一级动力学模型，速率常数为0.0463s⁻¹。目前的结果清楚地表明，使用叶提取物（PALE）合成的银混合ZnOPs在去除纺织和染料工业废水中的有害染料方面可以发挥关键作用。进一步拓展这些植物制备的复合材料的应用将促进一种重要的互补和替代策略，用于处理废水中的难降解污染物。
