Enhanced Photocatalytic Degradation of 4-chlorophenol using Lanthanum Oxide Nano-particles under UVC/Vis Irradiation

IF 1.4 Q4 NANOSCIENCE & NANOTECHNOLOGY

Journal of Nanostructures Pub Date : 2021-01-01 DOI:10.22052/JNS.2021.01.018

Z. Ghaedrahmat, M. Moussavi, S. Jorfi, Mehrnoosh Abtahi, N. Jaafarzadeh

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引用次数: 1

Abstract

ABSTRACTPhotocatalytic oxidation using novel photo-catalysts has been considered as an effective method for destruction of recalcitrant organics. In this study, photocatalytic degradation of 4-chlorophenol (4-CP) using lanthanum Oxide nanoparticles (LONPs) was investigated under UVC/Vis irradiation. Effect of operational parameters including pH (2 – 11), catalyst content (250-3000 mg L-1), contact time (20 - 180 min) 4-CP concentration (25- 400 mgL-1) were investigated according to one factor at the time experimental procedure. Highest removal efficiency of 4-CP was observed at pH =7. Result was indicated that the removal of 4-CP was increased from 76% to 92%, with increasing catalyst dosage from 0.25 to 1 g L-1. Then, a decrease was observed in 4-CP removal with an enhancement in catalyst dosage from 1 to 3 g L-1. Highest 4-CP removal (98%) was observed at the initial concentration of 25 mg L-1. At the contact time from 20 to 60 min, removal efficiency of 4-CP was increased from 24% to 64%, respectively. The contact time was increased to 120 min, removal efficiency of 4-CP was increased to 100%. Therefore, the optimal reaction time was 100 min. The AOS indices was showed an increasing trend of mineralization. In other words, the process of degradation of 4-CP was improved with photocatalytic degradation by UVC-La2O3. Among the kinetic models, the pseudo-first order model due to the highest correlation coefficient of R2 = 0.991 for the La2O3-UVC process.

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UVC/Vis辐照下氧化镧纳米颗粒光催化降解4-氯苯酚的研究

摘要利用新型光催化剂进行光催化氧化是一种有效的降解难降解有机物的方法。在UVC/Vis照射下，研究了氧化镧纳米颗粒(LONPs)光催化降解4-氯苯酚(4-CP)。考察了pH(2 ~ 11)、催化剂用量(250 ~ 3000 mgL-1)、接触时间(20 ~ 180 min)、4-CP浓度(25 ~ 400 mgL-1)等操作参数对反应的影响。pH =7时4-CP去除率最高。结果表明，当催化剂用量由0.25 g L-1增加到1 g L-1时，4-CP的去除率由76%提高到92%。然后，随着催化剂用量从1 g - L-1增加到3 g - L-1，观察到4-CP去除率下降。在初始浓度为25 mg L-1时，4-CP去除率最高(98%)。当接触时间为20 ~ 60 min时，4-CP的去除率分别由24%提高到64%。将接触时间延长至120 min, 4-CP的去除率提高到100%。因此，最佳反应时间为100 min。AOS指标呈矿化增加趋势。也就是说，UVC-La2O3光催化降解改善了4-CP的降解过程。其中，La2O3-UVC过程的拟一阶动力学模型相关系数最高，R2 = 0.991。

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来源期刊

Journal of Nanostructures NANOSCIENCE & NANOTECHNOLOGY-

CiteScore

2.60

自引率

0.00%

发文量

审稿时长

7 weeks

期刊介绍： Journal of Nanostructures is a medium for global academics to exchange and disseminate their knowledge as well as the latest discoveries and advances in the science and engineering of nanostructured materials. Topics covered in the journal include, but are not limited to the following: Nanosystems for solar cell, energy, catalytic and environmental applications Quantum dots, nanocrystalline materials, nanoparticles, nanocomposites Characterization of nanostructures and size dependent properties Fullerenes, carbon nanotubes and graphene Self-assembly and molecular organization Super hydrophobic surface and material Synthesis of nanostructured materials Nanobiotechnology and nanomedicine Functionalization of nanostructures Nanomagnetics Nanosensors.