Synthesis of Fe-doped ZnO by parallel flow precipitation method and its photocatalytic denitrification performance

doi:10.11949/j.issn.0438-1157.20161231

Abstract

Abstract:

The Fe-doped ZnO was synthesized by a parallel flow precipitation method with Zn(NO₃)₂·6H₂O and NH₃·H₂O as raw materials.The morphology and structure of as-synthesized products were characterized by X-ray diffraction(XRD), field emission scanning electron microscopy(FE-SEM), transmission electron microscopy(TEM), UV-visible diffuse reflectance spectra(UV-vis DRS) and Brunauer-Emmett-Teller(BET) for surface area analysis.Pyridine(Py) petroleum ether solution was used as model pollutant to investigate the denitrification performance of Fe-doped ZnO.The results illustrated that all of the Fe-doped ZnO products only comprise hexagonal wurtzite structure when the molar ratio of Fe/Zn from 0 to 1.0%.Fe doped ZnO photocatalysts exhibit much higher photocatalytic performance, which is ascribed to the decreased crystal size, increased specific surface area and reinforced absorbance ability in visible light range.When the concentration of Py is 10 μg·g^-1 and dosage of 0.50% Fe photocatalyst is 0.6 g·L^-1, the degradation efficiency of Py is 65.3% under the irradiation of a 150 W mercury lamp with illumination distance of 10 cm for 50 min.

Key words: Fe-doped ZnO, synthesis, denitrification, photocatalyst, nanoparticles, powders

摘要：

以Zn（NO₃）₂·6H₂O与NH₃·H₂O为原料，采用并流沉淀法合成了Fe掺杂ZnO，通过X射线衍射（XRD）、场发射扫描电镜（FE-SEM）、透射电子显微镜（TEM）、紫外可见漫反射（UV-vis DRS）及比表面积（BET）等测试方法对产物的结构与形貌进行了表征；并以吡啶（Py）石油醚溶液为模拟污染物，考察了其光催化脱氮性能。结果表明，当Fe掺杂量不高于1.0%时，所有复合物均拥有单一的六方晶系纤锌矿结构，尚未出现其他物相。Fe掺杂可有效抑制ZnO晶粒的生长，增大产品的比表面积，并拓宽其光响应范围，显著提高催化剂的光催化活性。处理初始浓度为10 μg·g^-1的Py石油醚溶液，0.50% Fe光催化剂投加量为0.6 g·L^-1，光照距离10 cm，经150 W高压汞灯照射50 min，Py的降解率达到65.3%。

关键词: Fe掺杂ZnO, 合成, 脱氮, 光催化剂, 纳米粒子, 粉体

CLC Number:

O643

MENG Qingming, WANG Jian. Synthesis of Fe-doped ZnO by parallel flow precipitation method and its photocatalytic denitrification performance[J]. CIESC Journal, 2017, 68(1): 437-443.

孟庆明, 王鉴. 并流沉淀法合成Fe掺杂ZnO及其光催化脱氮性能[J]. 化工学报, 2017, 68(1): 437-443.

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