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A comparison of the influence of synthesis methods on the photocatalytic activity of nitrogen doped titania-carbon nanotube nanohybrids
Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2020-08-14 , DOI: 10.1016/j.apcata.2020.117776
Sithembela A. Zikalala , Alex T. Kuvarega , Heena Madhav , Bhekie B. Mamba , Sabelo D. Mhlanga , Edward N. Nxumalo

The effect of the solgel and hydrothermal synthesis methods on the physicochemical properties and photocatalytic activity of nanohybrids consisting of nitrogen-doped TiO2 supported on varying ammounts (0 – 5 wt.%) of oxidized carbon nanotubes (NTiO2oxCNT) are compared. Hydrothermal synthesis promotes the formation of cylindrical pores independent of oxCNT content while solgel synthesis results in closed pores which transition to an open cone shape upon incorporation of oxCNTs. The point of zero charge for the nanohybrids is in the acidic range. Hydrothermally synthesized nanohybrids demonstrated high photocatalytic decolorization (up to 99.8 %) of Reactive red 120 (RR 120) than their solgel-synthesized counterparts (up to 93.1 %). A 97.4 % decolorization and 84 % TOC removal was achieved by the nanohybrid NTiO2oxCNT 5 wt.% oxCNT (5H) at 30 ppm RR 120. The LC−OCD-OND technique demonstrates that the nanohybrid (5H) is selective for the degradation of the biopolymers and low molecular weight neutrals in real industrial textile wastewater under 150 min under visible light.



中文翻译:

合成方法对氮掺杂二氧化钛-碳纳米管纳米杂化物光催化活性影响的比较

比较了溶胶凝胶法和水热合成方法对由掺杂在不同量(0 – 5 wt。%)的氧化碳纳米管(NTiO 2ox CNT)上的氮掺杂TiO 2组成的纳米杂化物的理化性质和光催化活性的影响。。水热合成促进圆柱形的形成独立细孔的CNT含量而溶胶-凝胶合成在封闭的孔,其过渡到后掺入的开放圆锥形状的结果碳纳米管。纳米杂化物的零电荷点在酸性范围内。与溶胶凝胶合成的对应物(高达93.1%)相比,水热合成的纳米混杂物显示出活性红120(RR 120)具有较高的光催化脱色(高达99.8%)。纳米杂化NTiO 2 - ox CNT 5 wt。%ox CNT(5H)在30 ppm RR 120下可实现97.4%的脱色和84%的TOC去除。LC-OCD-OND技术表明纳米杂化(5H)是选择性的在可见光下150分钟内降解实际工业纺织废水中生物聚合物和低分子量中性物质的过程。

更新日期:2020-08-26
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