ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
·
2017
·Vol. 43
·期 1
·423-432
·
IF 0.865
Yamani Zain Hassan
While most technologists use lamp light for the evaluation of catalysts synthesized for photocatalytic processes, some researchers prefer laser light. To conform in judgement, a comparative study of photocatalytically degrading methylene blue is reported, using a model catalyst Degussa P25, under different energies of 355 nm pulsed laser and under lamp (visible light and broader lamp light) irradiations. The used amounts of Degussa P25 after each batch of experiments were characterized by X-ray diffractometry, BET surface area analysis, field emission scanning electron microscopy, energy dispersive X-ray spectrometry and diffuse reflectance spectroscopy. The spectral photocatalytic degradation efficiencies, between broad lamp light and UV pulsed laser light, were comparable. Larger and spherical nanoparticles formation and reduction of BET surface area were noticed under pulsed UV laser beam irradiation of Degussa P25, while such trends were not observed under lamp irradiation for similar incident light intensities. The carbon contents on the surface, even after calcination of used samples at \(500\, ^{\circ }\) C, and the red shift in absorption spectra, were recorded in Degussa P25 used samples for both pulsed UV laser and lamp photocatalysis. Moreover, no change in the phases of Degussa P25 resulted under either types of irradiations during photocatalysis evaluation.
研究领域:
材料科学
·
环境化学
·
光催化
·
纳米材料
·
表面科学
·
分析化学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2015
·
IF 1.173
Lu Mao,Jiaojun Shen,Xiaoliang Ma,Zhonghui Lan,Xu Zhang
Photocatalytic degradation of 2,4-dinitrophenol in two commercial TiO2 (Degussa P25 and Hombikat UV-100) was investigated in this work. The properties of two TiO2 were systematically studied and described in detail. The observed photoactivity of Degussa P25 was 6–12 times higher than Hombikat UV-100 although the specific surface area of Hombikat UV-100 was 5.7 times more than that of Degussa P25. The photodegradation of 2,4-dinitrophenol was favored at neutral pH in Degussa P25, while its degradation was preferred at pH 3.0 in Hombikat UV-100 dispersion. The observed kinetic constant (kobs) for the photodegradation of 2,4-dinitrophenol in 20 mg/L humic acid solution was found to be 15% (Degussa P25) and 21% (Hombikat UV-100) of the values obtained from the corresponding pure aquatic solutions. The suppression effects of β-cyclodextrin on the photodegradation of 2,4-dinitrophenol over Degussa P25 (50%) was much more significant than that of Hombikat UV-100 because of the different adsorption behavior of β-cyclodextrin over two TiO2. Hydroxyl radical and valance band hole was found to be the predominant reactant during the degradation of 2,4-dinitrophenol using P25 and UV-100, respectively. Formic acid, acetic acid, oxalic acid, and were detected as advanced oxidation products.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2017
·
IF 3.33
Fei Chen,Feng Wang,Qing Li,CaiYuan Cao,Xiang Zhang,Hua Ma,Yu Guo
Different catalyst supports, namely: commercial Degussa P25 TiO 2 , anatase TiO 2 (CC), γ-Al 2 O 3 , and lab-synthesized AlOOH were used to prepare Pt-based catalysts for the room temperature formaldehyde oxidation. XRD, BET and XPS were conducted to characterize the bulk structure of support, the oxidation state of surface elements and the ratio of oxygen in hydroxyls to the total surface oxygen, as well as textural properties of catalysts. For the first time, a long-term activity test at 0% relative humidity was conducted to investigate relationships between the activity of the Pt-based catalysts with Pt dispersion and oxidation state and the relative abundance of surface OH groups. Pt/AlOOH showed the best activity, whereas Pt/P25 TiO 2 gave the worst activity. We consider that both the surface hydroxyl groups and the Pt dispersion are indispensable, and both act synergistically. The specific surface area is not the decisive factor for the present reaction.
研究领域:
催化化学
·
环境催化
·
材料化学
·
表面科学
·
大气污染控制
✓ 已验证
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2023
·
IF 4.3
Bo Wang,Jianhua Sha,Shuaishuai Chen,Weiyan Yin,Yude Li,Qinyan Yue,Haiyan Yu,Shiping Xu
Floating photocatalytic materials provide an effective way for the practical application of photocatalytic technology. In this study, a highly efficient and stable polypropylene photocatalytic floating ball (CC-P25/BC@PP) was designed and synthesized via firstly coupling Degussa P25 with biochar (BC) through click chemical reaction, followed by loading the composites on PP hollow ball with help of titanate coupling agent. Statistical analysis found that, compared to the PP ball decorated with simple P25/BC mixture (denoted as Mix-P25/BC@PP), click chemistry connection not only significantly increased the effective loading limit of P25/BC composites on PP ball, but also enhanced the adsorption-photocatalysis synergy between TiO 2 and biochar. As a result, the degradation rate constant of ciprofloxacin (CIP) was nearly doubled. Moreover, due to the strengthened connection between P25/BC composite with PP ball, stability of CC-P25/BC@PP was improved significantly, and the shedding rate of active ingredients from PP ball during cycling experiment, acid/alkali soak and ultrasonic oscillation were suppressed 3.80–6.71 times compared to Mix-P25/BC@PP. Therefore, the highly efficient and stable PP photocatalytic floating ball based on click chemistry reaction showed strong practical application potentials.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）