Article
Chemistry, Multidisciplinary
Xue Sun, Wenhui Wang, Chaolin Li
Summary: In humid air, VUV/UV photodegradation can efficiently remove organic volatile compounds, especially toluene. Adequate oxygen and water can promote the removal of organic compounds and increase mineralization efficiency.
ARABIAN JOURNAL OF CHEMISTRY
(2022)
Article
Engineering, Environmental
Jiahui Fan, Cun Deng, Yongfang Rao
Summary: This study conducted a comprehensive investigation on NDMA photodegradation under 365nm UV-LED illumination and found that the major degradation pathway is the photooxidation of the excited NDMA in the nonprotonated form.
WATER ENVIRONMENT RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Asma A. Alothman, Mohammad Rizwan Khan, Munirah D. Albaqami, Sonaimuthu Mohandoss, Zeid A. Alothman, Naushad Ahmad, Khadraa N. Alqahtani, Giorgio Vilardi, Linda J. Johnston
Summary: This study investigates the photodegradation of crystal-violet dye using a Ti3C2-MXene/NiO/CsPbI3 composite photocatalyst. The composite shows a significant improvement in the degradation rate and stability of the dye, as well as a reduced band gap. The results suggest the potential of MXene-based perovskite photocatalysts for environmental remediation.
Article
Chemistry, Multidisciplinary
Z. Xu, W. Huang, C. Chen, W. Ye, B. Guo, J. Qiu, J. Zhuang, C. Hu, B. Lei, G. Hu, Y. Liu
Summary: In this study, a novel type of fully UV absorbing carbon dots (QC-CDs) were synthesized using quercetin as the raw material via a one-step hydrothermal method. The prepared QC-CDs showed high absorption efficiency (>98%) in the entire ultraviolet region (200–400 nm) and were nearly transparent in the visible light region. They also exhibited good stability and resistance to photobleaching, maintaining their absorption abilities under different pH and temperature conditions. Furthermore, QC-CDs displayed a wider UV absorption range compared to a commercial water-soluble organic UV absorber, BP-4, and demonstrated similar aging resistance. The UV absorption mechanism of QC-CDs was investigated, and their potential application as a UV absorption system in waterborne coatings was explored. Ultimately, QC-CDs@PU with full UV absorption properties was utilized in a photodegradation prevention experiment of Rhodamine B, showcasing their potential as a new generation of water-soluble UV absorbers.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Chemistry, Analytical
Yueyue Li, Lixiao Wang, Haiyan Xu, Junhe Lu, Jean-Marc Chovelon, Yuefei Ji
Summary: UV254 photolysis is increasingly used for disinfection of water-born pathogens in wastewater, but it also leads to decomposition of organic contaminants in the wastewater. However, caution should be taken as the potential products may have carcinogenic and mutagenic risks.
ENVIRONMENTAL SCIENCE-PROCESSES & IMPACTS
(2022)
Article
Engineering, Environmental
Yixin Zhang, Yingjie Yan, Wenjing Bai, Rui Tang, Kuizu Su, Zhen-Hu Hu
Summary: This study investigated the photodegradation of HAPA under simulated sunlight conditions and its possible mechanism. The results showed that HAPA was not degraded under visible light irradiation, but decomposition occurred under UV254 and UV302 irradiation. However, no degradation of HAPA was observed under UV365 irradiation. UVC light was found to be the main wavelength for the degradation of HAPA under sunlight conditions. HCO3- and NO3- slightly enhanced the photodegradation, while Cl- and SO42- had a marginal influence. During the photodegradation, HAPA was decomposed into organic intermediates, inorganic arsenics, ammonia, and undetermined arsenic species, with arsenite (As(III)) being the dominant inorganic species.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Tutuk Djoko Kusworo, Andri Cahyo Kumoro, Nita Aryanti, Tonni Agustiono Kurniawan, Febio Dalanta, Nur Hashimah Alias
Summary: The addition of ZnO-MnO2@SiO2 photocatalyst composite to the PSf membrane improves its performance and enhances the treatment of NRW. The composite membrane has a well-constructed structure and a uniform dispersion of photocatalyst elementals, and it exhibits stable flux, recyclability, and antifouling properties under UV light irradiation.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Bryan Liu, Lauren Mullen, Emma M. Payne, Karl G. Linden
Summary: Krypton chloride (KrCl*) excimer ultraviolet (UV) light may offer advantages over conventional low-pressure (LP) UV for contaminant degradation. The authors investigated the direct and indirect photolysis as well as UV/hydrogen peroxide-driven advanced oxidation (AOP) of two chemical contaminants in different water samples using KrCl* and 254nm, 222nm UV sources. The results showed that the 222nm excimer lamps significantly improved the degradation of contaminants compared to the conventional 254nm LPUV. Rating: 8/10.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Zhuojuan Li, Jing Zhang, Deming Dong, Liwen Zhang, Heyang Sun, Yakun Wang, Zujian Sun, Sinan He, Zhiyong Guo
Summary: This study investigated the photodegradation of norfloxacin and ofloxacin in water ice with different dissociated species. The results showed that the dissociated species had a significant impact on the photodegradation process, and most degradation products had lower developmental toxicity than the parent drugs.
JOURNAL OF HAZARDOUS MATERIALS
(2024)
Article
Engineering, Environmental
Lu Chen, Hongchao Li, Jieshu Qian
Summary: The degradation of roxarsone (ROX) via UV-based advanced oxidation processes (AOPs) was investigated, with UV/PDS being the most effective in removing ROX and UV/H2O2 being the most effective in reducing total organic carbon (TOC). The degradation of ROX follows a pseudo-first-order kinetics model, with a significant enhancement observed at pH 11.0 in UV/PMS process.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Polymer Science
Fiona J. Horne, John J. J. Liggat
Summary: The degradation of poly(diethylene glycol terephthalate) (PDEGT) under accelerated aging conditions was investigated using simulated sunlight and UV lamps. Various spectroscopic techniques were employed to determine the extent of degradation. The results indicate that PDEGT degrades more significantly than poly(ethylene terephthalate) due to the susceptibility of the ether linkage. The diethylene glycol sequences do not act as photochemical weak links but serve as additional sites for secondary free radical chemistry.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Environmental Sciences
Yangtao Wu, Dongxu Qu, Lingjun Bu, Shumin Zhu, Shiqing Zhou
Summary: This study examined the risk of TCNM formation during the chlorine-UV process for nitrite-containing water. It was found that the presence of amino acid enhanced TCNM formation, while pre-chlorination time had no significant effect. The highest TCNM formation occurred at pH 7, and prolonged UV irradiation and increased chlorine to amino acid ratio reduced TCNM formation. Quantum chemical calculations confirmed the attack of NO2· on specific positions of benzoic acid. The findings contribute to understanding the TCNM formation mechanism and optimizing the chlorine-UV process parameters to reduce risk.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Engineering, Environmental
Xiaoming Mao, Min Li, Mengyao Li
Summary: Bi4O5Br2 with irregular flake shape was synthesized via a facile hydrolysis method and exhibited excellent visible-light-induced photocatalytic activity towards carbamazepine oxidation. Photogenerated holes and superoxide radical anions were identified as the main active species during the oxidation process. After 120 min of visible light exposure, the carbamazepine solution was pollution-free, and the as-synthesized Bi4O5Br2 showed good chemical stability and reusability in photodegradation processes.
WATER SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Environmental
Jingjing Yang, Wen Zhu, Qian Yao, Guining Lu, Che Yang, Zhi Dang
Summary: The study showed that nitrogen-doped biochars enhance the photodegradation of sulfamethazine, with pyridinic nitrogen doping decreasing energy and promoting the generation of reactive oxygen species. The results highlight the importance of nitrogen in the photochemical reactivity of chars under simulated light irradiation.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Engineering, Environmental
Ngonidzashe Masunga, Bhekie B. Mamba, Kebede K. Kefeni
Summary: A novel nano composite of CuSm0.06Fe1.94O4@g-C3N4 with exceptional properties was synthesized and showed high efficiency in degrading pollutants under visible light. The nanocomposite also exhibited good degradation effects on various dyes and pharmaceuticals. The influence of reaction parameters on degradation efficiency was investigated, and the nanocomposite showed minimal loss in performance after multiple cycles and could be easily separated from treated water.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
