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Photocatalytic kinetics of 2,4-dichloroaniline degradation by NiO-Clinoptilolite nanoparticles
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy ( IF 4.4 ) Pub Date : 2020-11-18 , DOI: 10.1016/j.saa.2020.119228
Fereshteh Iazdani , Alireza Nezamzadeh-Ejhieh

The ball-mill clinoptilolite nanoparticles (CNP) was ion-exchanged in Ni(II) solutions and calcined to obtain NiO-CNP catalysts with various NiO loadings. The resultant CNP was ion-exchanged in 0.1, 0.2, 0.3, and 0.4 M Ni(II) solutions and then calcined at 450 °C. The resultant NiO-CNPs contained 1.9, 2.3, 3.0, and 3.2% NiO, respectively. The XRD, FTIR, and DRS characterization techniques were applied. By applying the Scherrer equation on the XRD results, the average crystallite size for the NiO-CNP samples was estimated in the range of 42-65 nm. The pHpzc of the NiO-CNP species was slightly changed from 6.8 to 7.6 by an increase in the loaded NiO. The band gap energy of the samples was calculated by applying the Kubelka-Munk equation on the DRS results. The band gap energies of 3.81, 4.05, and 3.63 eV were estimated for the direct electronic transitions of the CN2, CN2.3, and CN3.2 samples, respectively. The boosted photoactivity was obtained in 2,4-dichloroanilyne (DCA) degradation when NiO supported onto both micronized clinoptilolite and its nanoparticles. The effects of the most important experimental variables on DCA photodegradation rate were kinetically studied by applying the Hinshelwood model on the results. The faster rate for the DCA photodegradation was achieved at the optimal conditions, including the catalyst dose: 0.5 g/L, CDCA: 5 ppm, and the initial pH: 3. Some new peaks were observed in the HPLC chromatograms for the photodegraded DCA solutions after 180 min and 300 min, which showed 84% and 95% DCA photodegradation.



中文翻译:

NiO-斜发沸石纳米粒子降解2,4-二氯苯胺的光催化动力学

将球磨斜发沸石纳米颗粒(CNP)在Ni(II)溶液中进行离子交换,然后煅烧以获得各种NiO负载量的NiO-CNP催化剂。将所得的CNP在0.1、0.2、0.3和0.4 M的Ni(II)溶液中进行离子交换,然后在450°C下煅烧。所得的NiO-CNP分别包含1.9%,2.3%,3.0%和3.2%的NiO。应用了XRD,FTIR和DRS表征技术。通过在XRD结果上应用Scherrer方程,NiO-CNP样品的平均微晶尺寸估计在42-65 nm范围内。通过增加负载的NiO,NiO-CNP物种的pHpzc从6.8轻微更改为7.6。通过在DRS结果上应用Kubelka-Munk方程计算样品的带隙能。带隙能为3.81、4.05和3。CN2,CN2.3和CN3.2样品的直接电子跃迁分别估计为63 eV。当NiO负载到微粉化斜发沸石及其纳米颗粒上时,在2,4-二氯苯乙炔(DCA)降解中获得了增强的光活性。通过在结果上应用Hinshelwood模型,动力学研究了最重要的实验变量对DCA光降解速率的影响。在最佳条件下,包括催化剂剂量:0.5 g / L,C,DCA的光降解速度更快。通过在结果上应用Hinshelwood模型,动力学研究了最重要的实验变量对DCA光降解速率的影响。在最佳条件下,包括催化剂剂量:0.5 g / L,C,DCA的光降解速度更快。通过在结果上应用Hinshelwood模型,动力学研究了最重要的实验变量对DCA光降解速率的影响。在最佳条件下,包括催化剂剂量:0.5 g / L,C,DCA的光降解速度更快。DCA:5 ppm,初始pH:3。在180分钟和300分钟后,HPLC色谱图中发现了光降解的DCA溶液的一些新峰,显示84%和95%的DCA光降解。

更新日期:2020-11-18
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