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首页> 外文期刊>Applied Nanoscience >Photodegradation of odorous 2-mercaptobenzoxazole through zinc oxide/hydroxyapatite nanocomposite
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Photodegradation of odorous 2-mercaptobenzoxazole through zinc oxide/hydroxyapatite nanocomposite

机译：氧化锌/羟基磷灰石纳米复合材料光催化降解2-巯基苯并恶臭

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In this study, ZnO/HAP nanocomposite with excellent photocatalytic activities was successfully synthesized by sol–gel method and used for degradation of 2-mercaptobenzoxazole (MBO) as model of odorous mercaptan compound in water. To optimize the performance of ZnO/HAP photocatalytic capabilities, ZnO/HAP loading (0.05–0.3?g/L), irradiation time (15–180?min), pH (3–11) and initial concentration of MBO (10–100?ppm) were investigated. At neutral pH of 7, the highest amount of the MBO (99.45?%) was degraded by ZnO/HAP nanocomposite through photocatalytic oxidation process within 2?h of irradiation time. A maximum adsorption capacity of 197.64?mg?g?1 was obtained for ZnO/HAP under optimized conditions. BET results indicated that ZnO/HAP had a surface area of 182.36?mg2g?1 which was much greater than pure ZnO nanoparticles (31.2?mg2g?1). TEM image demonstrated a spherical shape structure of ZnO/HAP with average particle size of 25?nm in diameter. The XRD patterns revealed the principal components of ZnO/HAP including HAP and ZnO. FTIR spectrum results supported formation ZnO and HAP by their stretching mode in composite. Comparison of photocatalytic activity of ZnO/HAP with pure ZnO and HAP nanoparticles had clearly recognized that latter is the most active photocatalyst in the degradation of MBO using UV light as source energy. The reason for greater activity of ZnO/HAP was due to its larger specific surface area (182.36?m2g?1) and high generation of active ({ext{HO}}^{cdot}) and ({ext{O}}_{2}^{- 2 cdot}) species
机译：在这项研究中，通过溶胶-凝胶法成功合成了具有优异光催化活性的ZnO / HAP纳米复合材料，并将其用于降解2-巯基苯并恶唑（MBO），作为水中有气味的硫醇化合物的模型。为了优化ZnO / HAP光催化性能的性能，ZnO / HAP的负载量（0.05–0.3？g / L），辐照时间（15–180？min），pH（3–11）和MBO的初始浓度（10–100）进行了研究。在中性pH值为7时，ZnO / HAP纳米复合材料在光照射时间的2小时内，通过ZnO / HAP纳米复合材料降解了最高量的MBO（99.45％）。在最佳条件下，ZnO / HAP的最大吸附量为197.64？mg？g ？1 。 BET结果表明ZnO / HAP的表面积为182.36？mg 2 g ？1 ，远大于纯ZnO纳米颗粒（31.2？mg 2 < / sup> g ？1 ）。 TEM图像显示了ZnO / HAP的球形结构，平均粒径为25？nm。 XRD图谱显示了ZnO / HAP的主要成分，包括HAP和ZnO。 FTIR光谱结果通过其在复合材料中的拉伸方式支持了ZnO和HAP的形成。 ZnO / HAP的光催化活性与纯ZnO和HAP纳米颗粒的比较清楚地认识到，后者是在以紫外线为能源的MBO降解中最活跃的光催化剂。 ZnO / HAP活性较高的原因是由于其较大的比表面积（182.36？m 2 g ？1 ）和高活性（{ text {HO}} ^ { cdot} ）和（{ text {O}} _ {2} ^ {-2 cdot} ）种

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