藻蓝蛋白合成及氧化锌纳米粒子增强光催化活性去除有机硫污染物。

Phycosynthesis and Enhanced Photocatalytic Activity of Zinc Oxide Nanoparticles Toward Organosulfur Pollutants.

机构信息

Department of Marine Chemistry, Khorramshahr University of Marine Science and Technology, P.O. Box 669, Khorramshahr, Iran.

出版信息

Sci Rep. 2019 May 3;9(1):6866. doi: 10.1038/s41598-019-43368-3.

DOI:10.1038/s41598-019-43368-3

PMID:31053730

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6499781/

Abstract

A novel eco-friendly procedure was developed to produce safer, stable and highly pure zinc oxide nanoparticles (ZnO NPs) using microalgae Chlorella extract. The ZnO NPs were synthesized simply using zinc nitrate and microalgae Chlorella extract which conducted at ambient conditions. In this recipe, microalgae Chlorella extract acted as the reducing agent and a stabilizing layer on fresh ZnO NPs. UV-visible spectrum was confirmed the formation of ZnO NPs showing an absorption peak at 362 nm. XRD results demonstrated that prepared ZnO NPs has a high-crystalline hexagonal (Wurtzite) structure, with average size about 19.44 nm in diameter. FT-IR spectral analysis indicated an active contribution of algae-derived biomolecules in zinc ions bioreduction. According to SEM and TEM observations, ZnO NPs are well dispersed and has a hexagonal shape with the average size of 20 ± 2.2 nm, respectively. Based on gas chromatography analyses, the optimum 0.01 g/L dosage of ZnO catalyst revealed an effective photocatalytic activity toward the degradation (97%) of Dibenzothiophene (DBT) contaminant as an organosulfur model in the neutral pH at the mild condition. Rapid separation and facile recyclability at five consecutive runs were demonstrated high efficiency and durability of green ZnO nanophotocatalyst. The possible mechanisms of green ZnO NPs formation and the photo-desulfurization of DBT were also proposed.

摘要

开发了一种新颖的环保工艺，使用微藻小球藻提取物生产更安全、稳定和高纯的氧化锌纳米粒子（ZnO NPs）。简单地使用硝酸锌和微藻小球藻提取物在环境条件下合成 ZnO NPs。在此配方中，微藻小球藻提取物既作为还原剂，又作为新鲜 ZnO NPs 的稳定层。紫外可见光谱证实了 ZnO NPs 的形成，其在 362nm 处显示出吸收峰。XRD 结果表明，所制备的 ZnO NPs 具有高结晶六方（纤锌矿）结构，平均粒径约为 19.44nm。FT-IR 光谱分析表明藻类衍生生物分子在锌离子生物还原中具有积极的贡献。根据 SEM 和 TEM 观察，ZnO NPs 分散良好，呈六边形，平均尺寸分别为 20±2.2nm。根据气相色谱分析，最佳的 0.01g/L ZnO 催化剂用量在中性 pH 值和温和条件下对二苯并噻吩（DBT）污染物作为有机硫模型显示出有效的光催化降解活性（97%）。在五个连续运行中表现出快速分离和易于回收利用，证明了绿色 ZnO 纳米光催化剂的高效性和耐用性。还提出了绿色 ZnO NPs 形成和 DBT 光脱硫的可能机制。