WATER ENVIRONMENT RESEARCH
·
2023
·Vol. 95
·期 6
·e10898
·
IF 3.1
Qiang Ren,Juming Liu,Zhilin Yang,Qi Yang
TiO 2 (P25) could significantly accelerate the degradation of carbon tetrachloride (CT) in the UV/K 2 S 2 O 8 system by about 4 times, and 88.5% of the CT was dechlorinated. The presence of dissolved oxygen (DO) could delay the degradation process. The addition of P25 produced •O 2 − through the transformation of DO, so as to prevent the inhibitory effect. In this work, it was proved that P25 could not enhance the persulfate (PS) activation. The presence of P25 delayed the CT degradation in the absence of DO. Furthermore, the results of electron paramagnetic resonance (EPR) and quenching experiments demonstrated that the presence of P25 could produce •O 2 − , which could remove CT. Therefore, this work highlights the function of •O 2 − during the reaction and excludes the possibility that the presence of P25 could activate PS under the UV illumination. Then, the pathway of the CT degradation is discussed. Heterogeneous photocatalysis could provide a new method to deal with the problems caused by DO. Practitioner Points The main reason of the improvement in P25-PS-UV-EtOH system is transformation of dissolved oxygen into superoxide radical in presence of P25. The addition of P25 could not accelerate PS activation in P25-PS-UV-EtOH system. Photo-induced electron, superoxide radical, alcohol radical and •SO 4 − could all contribute to CT degradation, and the pathway is discussed.
研究领域:
环境科学
·
光催化
✓ 已验证
DOI
PubMed
高影响因子
AICHE JOURNAL
·
2022
·Vol. 68
·期 12
·e17852
·
IF 4.167
Yang Zhao,Xinyi Zhang,Jiarui Yang,Mingyu Gao,Pengfei Yang,Qian Wang,Dianqing Li,Junting Feng
In this work, a commercial P25 (TiO 2 ) with phase junctions between (101) and (110) faces supported Pt catalyst was prepared for glycerol selective oxidation, giving a decent 76.8% glyceric acid (GLYA) yield, and good stability. The kinetic experiments calculated apparent activation energy, turnover frequency (TOF), and reaction rates, demonstrating Pt/P25 could facilitate glyceraldehyde (GLYAD) formation and inhibit GLYA over-oxidation. Series of structural techniques confirmed the 101/110 junctions in P25 contributed electronic effect on Pt through metal-support interface, which improved the oxygen activation ability and optimized the GLYAD/GLYA adsorption modes. Furthermore, progressive scale-up reactions were tested and the mass transfer limitations under different conditions were thoroughly studied. The obtained mass transfer factors suggested the gas–liquid and liquid–solid mass transfer were severely limited. Finally, through optimizing the conditions, Pt/P25 catalyst achieved 75.8% GLYA yield at 300 ml-scale reaction, realizing equivalent magnification with the 5 ml-scale experiment.
研究领域:
催化化学
·
材料科学
·
反应动力学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Nini Zhang,Xiangmei Li,Yanglong Guo,Yun Guo,Qiguang Dai,Li Wang,Wangcheng Zhan
Crystal engineering of metal oxide supports represents an emerging strategy to improve the catalytic performance of noble metal catalysts in catalytic oxidation of chlorinated volatile organic compounds (CVOCs). Herein, Pt catalysts on a TiO2 support with different crystal phases (rutile, anatase, and mixed phase (P25)) were prepared for catalytic oxidation of 1,2-dichloroethane (DCE). The Pt catalyst on P25-TiO2 (Pt/TiO2-P) showed optimal activity, selectivity, and stability, even under high-space velocity and humidity conditions. Due to the strong interaction between Pt and P25-TiO2 originating from the more lattice defects of TiO2, the Pt/TiO2-P catalyst possessed stable Pt0 and Pt2+ species during DCE oxidation and superior redox property, resulting in high activity and stability. Furthermore, the Pt/TiO2-P catalyst possessed abundant hydroxyl groups, which prompted the removal of chlorine species in the form of HCl and significantly decreased the selectivity of vinyl chloride (VC) as the main byproduct. On the other hand, the Pt/TiO2-P catalyst exhibited a different reaction path, in which the hydroxyl groups on its surface activated DCE to form VC and enolic species, besides the lattice oxygen of TiO2 for the Pt catalysts on rutile and anatase TiO2. This work provides guidance for the rational design of catalysts for CVOCs.
研究领域:
催化
·
环境化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 6
·065515
·
IF 1.449
Xialin Peng,Yonggang Zhang,Ying Liu
Noble metal Ag nanoparticles were deposited on Ag3PO4/P25 heterojunction structure by ultraviolet (UV) light induction to construct Ag/Ag3PO4/P25 double heterojunction catalyst for efficient decomposition of phenacetin (PNT). X-Ray Diffraction (XRD), x-ray photoelectron spectroscopy (XPS), Raman and photoluminescence (PL) spectroscopy analyses were employed to evaluate the microstructure, chemical structure and photocatalytic activity of synthesized catalyst materials. PL spectroscopy analyses revealed that a considerable enhancement in photochemistry activity of Ag3PO4/P25 due to the deposition of Ag. The effects of Ag3PO4 mass ratios, operating conditions on PNT degradation and catalyst stability were also investigated. Results showed that Ag/10% Ag3PO4/P25 under the operating conditions of catalysts concentration of 0.5 g L−1 and pH of 9.0 with UV light irradiation displayed a better photocatalysis degradation performance. When the concentration of PNT was 20 mg L−1, the removal rate of PNT and TOC obtained from Ag/Ag3PO4/P25 system were up to 97 % and 83%, respectively. The removal rate of PNT drops from 97% to 85% between the first and last cycles after 60-min conversion. Ag/Ag3PO4/P25 with a high catalytic reaction efficiency was ascribed to the deposition of Ag. Ag is an electron acceptor and Ag3PO4 have excellent electron conductivity in a heterostructure, the novel Ag/Ag3PO4/P25 composite catalyst could reduce the recombination rate of electron-hole pairs and prolong the lifetime of photogenerated electrons.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2017
·
IF 1.815
Yuying Dong,Yanqing Jiao,Baojiang Jiang,Chungui Tian
The excellent photocatalytic performance of a commercial ZnO (C-ZnO-1) was demonstrated. This ZnO showed approximately 3.8, 7.4 and 5.2 times greater activity than P25 TiO 2 for the degradation of rhodamine B, methyl orange and methyl blue, respectively. After compounding with Ag, the catalyst showed record-high activities for the degradation of the three dyes (approximately 9.5, 13, and 50 times that of P25). The high activity of C-ZnO-1 is attributed to the low concentration of bulk defects (i.e., a high degree of crystallinity) and the relatively high number of surface defects (i.e., a higher ratio of surface hydroxyl oxygen).
研究领域:
材料科学
·
环境科学
·
纳米技术
·
化学
✓ 已验证
产品关联
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
危险品化学品经营许可证（带存储）