Hydroxyl-functionalized TiO2@SiO2@Ni/nZVI nanocomposites fabrication, characterization and enhanced simultaneous visible light photocatalytic oxidation and adsorption of arsenite
Hydroxyl-functionalized TiO2@SiO2@Ni/nZVI nanocomposites fabrication, characterization and enhanced simultaneous visible light photocatalytic oxidation and adsorption of arsenite
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羟基功能化TiO2@SiO2@Ni/nZVI纳米复合材料的制备、表征以及增强的同步可见光催化氧化和亚砷酸盐吸附
DOI：
10.1016/j.cej.2018.01.019
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发表时间：
2018-04
影响因子：
15.1
通讯作者：
Yunmeng Zhao
中科院分区：
文献类型：
--
作者：
Yang Huang;Weihua Zhang;Maosheng Zhang;Xin Zhang;Yunmeng Zhao
本研究采用原位表面修饰、共沉淀法和溶胶-凝胶法合成了富含羟基的水杨酸acid-TiO2@SiO2@Ni/nZVI （SA-NFST）纳米复合材料。采用扫描电子显微镜（SEM）、x射线粉末衍射（XRD）、振动样品磁强计（VSM）、透射电子显微镜（TEM）、零电荷点（PZC）、紫外-可见漫反射光谱（UV-vis）、红外光谱（FTIR）和x射线光电子能谱（XPS）等多种技术对纳米颗粒的性质进行了表征。结果表明，SA-NFST具有可见光捕获效率高、易于磁分离、羟基和羟基自由基丰富、比表面积大等特点。在不同的实验条件下，包括pH、初始亚砷酸盐浓度、催化剂用量、接触时间和共存阴离子（PO43−、SiO32−、CO32−和SO42−），考察了新材料对亚砷酸盐的吸附和光氧化。根据Langmuir吸附等温线计算出As（III）在SA-NFST上的最大吸附量qm分别为73.9和83.6 mg/g。在1.5 h的可见光照射下，在0.25 g/L的SA-NFST纳米颗粒（NPs）存在下，99.8%的As(III)（5.0 mg/L）被去除。As（III）残留浓度（9.0 µg/L）小于10 µg/L，低于饮用水中最大允许浓度。As（III）的去除可能是由于表面吸附、可见光照射下光催化氧化的协同联合作用。
In this study, salicylic acid-TiO2@SiO2@Ni/nZVI (SA-NFST) nanocomposites with rich hydroxyl groups were synthesized using in situ surface modified, co-precipitation, and sol-gel methods. A variety of techniques, including scanning electron microscopy (SEM), X-ray powder diffraction (XRD), vibrating sample magnetometer (VSM), transmission electron microscopy (TEM), the point of zero charge (PZC), UV–vis diffuse reflectance spectra (UV–vis), infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS), were used to characterize the properties of the nanoparticles.The results showed that the SA-NFST exhibited high visible light-harvesting efficiency, easily magnetic separation, rich hydroxyl groups and hydroxyl radicals, and larger surface area. The adsorption and photo-oxidation of arsenite by the new materials were explored in different experimental conditions, including pH, initial arsenite concentration, catalyst dosage, contact time, and coexisting anions (PO43−, SiO32−, CO32−, and SO42−).The maximum adsorption capacities (qm) of As(III) onto SA-NFST calculated from Langmuir adsorption isotherm were 73.9 and 83.6 mg/g without and with visible light irradiation, respectively. >99.8% of As(III) (5.0 mg/L) was removed in the presence of 0.25 g/L SA-NFST nanoparticles (NPs) under 1.5 h visible light illumination. The residual concentration of As(III) (9.0 µg/L) was less than 10 µg/L, which is below the maximum allowable values in drinking water. As(III) removal may be due to the synergic combined effects of surface adsorption, photocatalytic oxidation under visible light illumination.
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DOI：
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发表时间：
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