RSC Advances
·
2019
·Vol. 9
·期 1
·450-459
·
IF 3.049
Zhikai Wei,Peng Li,Muhammad Hassan,Pu Wang,Cong Xu,Long-Fei Ren,Yiliang He
Photovoltaic wastewater contains a large amount of thiourea that cannot be directly treated by biological methods because of its biotoxicity. In this study, a novel O3/H2O2 + BiPO4/UV synergy technique was used as a pre-treatment process to degrade thiourea. The effects of H2O2 and catalyst loading were investigated, and the transformation pathway of thiourea was predicted based on the intermediates detected by UPLC-Vion-IMS-QToF. The synergy technique degraded 89.14% thiourea within only 30 min, and complete degradation occurred after 150 min. The TOC removal of O3/H2O2 + BiPO4/UV was 1.8, 1.5, and 1.9 times that of O3/H2O2 and BiPO4/UV/H2O2 single processes and O3/H2O2 + UV process, respectively, which was due to the synergy between H2O2 residues and BiPO4. In addition, thiourea was mainly degraded by ·OH into thiourea dioxide and melamine (polymerized by other intermediates) and then further degraded into biuret and methyl carbamate by the holes of BiPO4, followed by complete mineralization into H2O and CO2. These results confirm that the O3/H2O2 + BiPO4/UV synergy technique is a promising option for the degradation of thiourea.
研究领域:
环境工程
·
水处理
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PLANT GROWTH REGULATION
·
2019
·Vol. 39
·期 1
·358-369
·
IF 2.179
Cui Dandan,Mo Yuncai,Zeng Lingjie,Feng Kai,Feng Xiaoyun,Huang Jialing,He Mengling,Zhang Xiaoyuan,Teng Xifeng
The response of Dendrobium officinale Kimura et Migo ( D. officinale ) to continuous UV-B irradiation at different carbon to nitrogen ratios (C/N ratios) was investigated. Seedlings grown for 60 days were incubated under aseptic conditions with UV-B irradiation (15.6 µW cm −2 ) at different C/N ratios: control group (CK; C/N 30 without UV-B), UV-B + CK (C/N 30 with UV-B irradiation, similarly hereafter), UV-B + C/N 120, UV-B + C/N 60, UV-B + C/N 15, UV-B + C/N 10, UV-B + C/N 7.5. Growth parameters (the defoliation rate and the sprout number), photosynthetic pigments (carotenoids, chlorophyll a and chlorophyll b), total polysaccharides, total alkaloids, and activities of antioxidant enzymes were determined following 4, 8, 12, and 16 days of continuous UV-B exposure. Results indicated that UV-B irradiation increased the defoliation rate and the content of carotenoids, total polysaccharides and total alkaloids, as well as the activities of antioxidant enzymes. Conversely, UV-B irradiation reduced the sprout number and chlorophyll content in D. officinale . Compared with UV-B + CK, lower C/N ratio treatments (UV-B + C/N 15, UV-B + C/N 10 and UV-B + C/N 7.5) enhanced the defoliation rate and sprout number, but decreased antioxidant enzyme activities and total polysaccharide content during the whole period, and reduced total alkaloid content after 4 days of UV-B exposure. Following initial UV-B irradiation, lower C/N ratios increased the contents of carotenoid and chlorophyll b, while after 8 days, a reversal in carotenoid content was observed, and after 12 days, a reversal in chlorophyll b content was observed. Optimizing the C/N ratio (C/N 60) resulted in lower defoliation rate, higher photosynthetic pigments and total polysaccharides, and increased activities of antioxidant enzymes, whereas no significant change in sprout number and total alkaloid content was recorded under long-term UV-B irradiation. Furthermore, the UV-B + C/N 120 treatment negatively affected D. officinale in terms of an increased defoliation rate and reduced sprout number, photosynthetic pigments, and total alkaloids. Therefore, results suggested that an appropriate C/N ratio (C/N 60) could ameliorate the adverse effects of continuous UV-B irradiation on D. officinale .
研究领域:
植物学
·
药用植物学
·
环境生物学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2014
·
IF 3.902
Hao Li,Bo Pan,Shaohua Liao,Di Zhang,Baoshan Xing
Iron is rich in soils, and is recently reported to form stable complexes with organic free radicals, generating environmentally persistent free radicals (EPFRs). The observation may challenge the common viewpoint that iron is an effective catalyst to facilitate the degradation of various organic chemicals. But no study was specifically designed to investigate the possible inhibited degradation of organic chemicals because of the formation of EPFRs in dry environment. We observed that catechol degradation under UV irradiation was decreased over 20% in silica particles coated with 1% hematite in comparison to uncoated silica particles. Stabilized semiquinone or quinine and phenol radicals were involved in HMT-silica system. EPFR formation was thus the reason for the reduced catechol degradation on HMT-silica surface under UV irradiation at ambient temperature. EPFRs should be incorporated in the studies of organic contaminants geochemical behavior, and will be a new input in their environmental fate modeling.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Xiaoquan Li,Fuping Bian,Shi Li,Xuefeng Gui,Mingfeng Yao,Jiwen Hu,Shudong Lin
UV curing technology is a new green technology developed in the 21st century, and has been widely used in daily life and industrial production. However, a major drawback encountered with UV curing is oxygen inhibition, especially in free radical photopolymerization. As reported herein, three multifunctional silicone acrylate prepolymers were obtained via the one-step hydrosilylation of dipentaerythritol hexaacrylate (DPHA) and hydride-terminated polydimethylsiloxane (H-PDMS). These prepolymers contain five acrylate groups at each end of the polysiloxane chain, and also has a high viscosity, all of which contribute to overcome oxygen inhibition, and thus they have efficient anti-oxygen inhibition abilities. After the addition of a few photoinitiators, each of the prepolymers could be rapidly cured in air to yield a transparent film. The transparency of these cured films is over 95% on the surface of an underlying polyethylene terephthalate (PET) substrate. They remain stable at temperatures reaching up to 352.2 to 364.8 °C, thus demonstrating that they have excellent heat resistance. Water droplets exhibit water contact angles between 103° and 105° on these films, and surface energies of the cured films are from 24.58 to 20.69 mN/m. Finally, the coatings have good anti-smudge and anti-fingerprint properties, and the overall results show that these films have potential applications as UV-curable anti-smudge coatings.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Kun Xu,Zhijia Zhu,Chunyan Hu,Jian Zheng,Huitao Peng,Baojiang Liu
There is currently plenty of emphasis on measures to handle the water pollution spurred on by the misuse of antibiotics. Given its exceptional degradation accomplishment, periodate (PI), a steady solid oxidant, has promising future applications in the breakdown of antibiotics. In this research, PI was activated with UV/CoFe 2 O 4 (CFO) for the first time in an attempt to eliminate oxytetracycline (OTC). The UV/CFO/PI system eliminated 30 mg∙L -1 OTC with a removal effectiveness of almost 100 % in 12 min (OTC 30 mg∙L -1 , CFO 0.2 g∙L -1 , PI 2 mM, pH 5.5). In addition, the ferromagnetism of the CFO assisted to the system's remarkable cycling achievement, with 85.9 % of the OTC still removed after ten cycles. Various organic contaminants, which include reactive blue KN-R (KN-R), ciprofloxacin (CIP), chlortetracycline (CTC), and levofloxacin (LVX), further demonstrated the UV/CFO/PI system to be useful for degrading. The primary active substances for OTC elimination were revealed and recognized through scavenging experiments and EPR analysis as h + , •IO 4 , •IO 3 , 1 O 2 , •OH, and •O 2 – . Simultaneously, redox cycles of Fe(III)/Fe(II) and Co(III)/Co(II) were also observed by XPS test to hasten OTC deterioration. It appeared that this system may be a green approach for antibiotic elimination by investigating the degradation route of OTC and the influence it has on the surroundings employing FuKui functions, LC-MS, and toxicological analysis software (T.E.S.T.), respectively. Additionally, we observed that the CFO (2 2 2) crystal surface has the best adsorption impact on PI by computing Eads from DFT.
研究领域:
环境科学
·
化学工程
·
材料科学
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Leonardo Togar Samosir,Ferry Anggoro Ardy Nugroho,Vivi Fauzia
Electrochemical water splitting, a key process for extracting hydrogen energy from water, is recognized as a promising eco-friendly technology. Molybdenum disulfide (MoS 2 ), especially when possessing abundant defects, emerges as a cost-effective and efficient catalyst for hydrogen evolution reaction (HER), presenting a viable alternative to noble metals such as platinum (Pt). However, the impact of UV-Ozone (UVO) in generating defects in bulk 2H-MoS 2 remains underexplored. Here, we successfully synthesized 2H-MoS 2 using the hydrothermal method on a 3D conductive carbon cloth. Subsequently, the sample underwent UVO treatment for three different durations of 10, 30, and 50 min. Our results demonstrate that a 50-minute exposure to UVO yields the most effective HER performance, with a significant decrease in the onset potential from 189 mV to 116 mV and a low Tafel slope of 64 mV/decade. This enhancement is attributed to increased surface activity, evident in a more than fourfold increase in double-layer capacitance ( C dl ). Importantly, the 50-minute UVO treatment not only significantly improves the purity of MoS 2 and increases the number of edge sites, but also lead to an increase in sulfur vacancies and the formation of amorphous oxygen-incorporated MoS x . These edge sites, along with sulfur vacancies and oxygens incorporation, are considered ideal for hydrogen binding, enhancing electron transport, and improving HER activity.
研究领域:
材料科学
·
能源技术
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Yanan Liu,Guangyan Wang,Shuaishuai Lu,Siqi Wang,Peijuan Jiang,Huan Chen,Fang Jiang
Pollution caused by per - and polyfluoroalkyl substances (PFASs) has raised global health concerns and there is an urgent need for researchers to find effective treatment methods. The covalent triazine framework (CTF) adsorbent materials with different structures based on various precursors using the ionothermal method were prepared and characterized in this study. Among them, F-doped CTF (F-CTF) is favorable for effective mass transfer in the adsorption process due to its rich microporous structure and large specific surface area. The maximum adsorption capacity (q max ) for PFOA reached 769.2 mg/g under the synergistic effect of electrostatic force and the interaction of F F. After six cycles of adsorption-desorption experiments, the adsorption and desorption rates of the F-CTF 400°C were stable at >90 %. This result indicates that F-CTF 400°C possesses high stability and recyclability. Furthermore, the desorption solution containing a high concentration of PFOA was treated directly by a UV/Na 2 SO 3 system, utilizing the e aq − within the system to decompose PFOA. The reduction and defluorination efficiencies for the desorption solution with high concentrations of PFOA reached 90 % and 40 %, respectively. The study results indicate that by leveraging the high adsorption selectivity and stable recoverability of F-CTF 400°C , the UV/Na 2 SO 3 system can completely remove PFOA. This approach offers a novel solution for the elimination of PFOA pollution in the environment.
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
PROGRESS IN ORGANIC COATINGS
·
2024
·
IF 6.5
Lei Xia,Tianyi Lu,Miqiu Kong,Jingke Pei,Yajiang Huang,Yanhua Niu,Yadong Lv,Guangxian Li
Despite extensive research on the impact of environmental weathering on the degradation of electromagnetic wave absorbing (EWA) coatings, the influence of material composition on their service stability remains underexplored. In this study, we prepared EWA coatings with epoxy resin as the matrix and flaky carbonyl iron (FCI) as the absorber, at concentrations of 50 wt%, 60 wt%, and 70 wt%. These coatings underwent a 192-h combined UV irradiation-salt spray accelerated aging test to examine the effects of varying absorber concentrations on their corrosion behavior and mechanisms. Surface morphology, chemical structure evolution, and corrosion diffusion were analyzed using X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM) with energy-dispersive X-ray spectroscopy (EDX). Corrosion behaviors and their impact on wave absorption performance were further investigated using electrochemical impedance spectroscopy (EIS) and electromagnetic simulations. Our results show that increasing FCI content accelerates the corrosion rate of the composite coating. This acceleration is attributed to the reduced protective effect of the epoxy matrix at higher FCI concentrations and the defects caused by FCI corrosion, which facilitate the penetration of corrosive media. This study elucidates the influence of varying absorber concentrations on the weather resistance of the coatings and their microscopic mechanisms, providing valuable insights for optimizing the service stability of EWA coatings.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
Chemical Engineering Journal Advances
·
2020
·
IF 0
Hanlu Yan,Minghan Luo,Qiuwen Chen,Taeseop Jeong,Jianyun Zhang,Li Wang
Eliminating tetracycline antibiotics from waste streams by conventional water treatment techniques remains challenging. Vacuum-ultraviolet/ultraviolet (VUV/UV)-based advanced oxidation technique is a promising, environment-friendly alternative to remove micropollutants from wastewater without adding chemicals. This study carried out flow-through experiments and numerical modeling to determine the efficiency and mechanism of VUV/UV process in degrading oxytetracycline (OTC) via a newly developed photoreactor with tangential inlet and outlet. OTC degradation pathway and reaction rate constant were identified through semi-batch experiments at various initial OTC concentrations in different water matrices. The decomposition of OTC by the VUV/UV process was as effective as that by the H 2 O 2 /UV approach but generated less byproducts and thus could be beneficial for process control. Removal of organic matter and inorganic ions were suggested before VUV/UV process to improve the treatment efficiency. Flow characteristics simulated by computational fluid dynamics (CFD) revealed that a special bidirectional spiral flow was formed in the new reactor, which improved the mixing efficiency of fluids and thus enhanced the contact between hydroxyl radicals and the contaminant. The distribution profiles of OTC and hydroxyl radicals confirmed that the target contaminant was decomposed following the flow direction, and the degradation efficiency could be further increased by decreasing the internal diameter of the photoreactor. The electrical energy-per-order analysis of the photoreactor proved the high-energy utilization efficiency and cost-effectiveness of the VUV/UV process.
研究领域:
环境科学
·
水处理工程
·
化学工程
✓ 已验证
DOI
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2025
·
IF 7.8
Zhuowen Yang,Ke Feng
The Fe 0 /H 2 O 2 system, which is capable of removing organic matter from wastewater, suffers from limited efficiency because of slow Fe 2+ release and restricted Fe 2+ /Fe 3+ cycling. This study investigated the performance and mechanism of a UV-enhanced Fe 0 /H 2 O 2 system for the removal of organics in semiaerobic aged refuse biofilter (SAARB) effluent from landfill leachate, with HO • identified as the primary reactive oxygen species. UV not only initiates a homogeneous Fenton reaction through direct photolysis of H 2 O 2 and promotes Fe 2+ release from Fe 0 but also accelerates surface corrosion of Fe 0 to form more iron oxides, which react with H 2 O 2 in a heterogeneous Fenton reaction, thereby generating HO • at a faster rate. HO • preferentially reacts with organics containing chromophores or auxochromes, attacks humus with abundant conjugated structures, converts them into smaller organic molecules, and even achieves mineralization. Increasing the Fenton reagent ratio and dosage enhances the removal performance of the UV/Fe 0 /H 2 O 2 system, with optimal organic removal observed under acidic conditions. Ultimately, optimal conditions of the UV power (10 W), Fe 0 (2 mM) and H 2 O 2 (12 mM) dosages at pH 3.0 achieved 84.48% CN, 90.06% UV 254 , and 62.84% TOC removal. This study provides a feasible solution for achieving discharge standards for landfill leachate.
研究领域:
环境科学
·
废水处理
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
·
2016
·Vol. 54
·期 16
·1612-1623
·
IF 3.318
Yunjiao Gu,Shuxue Zhou,Huali Luo,Limin Wu,Wei Gao,Jinlong Yang
Controllable phase segregation adjustment for immiscible polymer blends has always been tough, which hinders the development of amphiphilic antifouling coatings from more accessible blends. Herein, methacrylated poly(dimethylsiloxane) (PDMS-MA) was synthesized and mixed with poly(ethylene glycol)methylether methacrylate (PEG-MA). It was interestingly discovered that these PDMS-MA/PEG-MA blends displayed upper critical solution temperatures (UCST) due to thermo-induced conformational change of PEG-MA and the UCST changed with PDMS-MA/PEG-MA mass ratios. Micro-/nano-phase segregation, nanophase segregation, or homogenous morphology were therefore achieved. These PDMS-MA/PEG-MA blends with different mass ratios were UV-cured under varying temperatures to fabricate coatings. Their surface morphology and wettability are readily adjusted by phase segregation. For the first time, highly hydrophilic surface was achieved for coatings with microphase segregation because of the exposure of PEG-rich domains, which exhibited an enhanced protein resistance against bovine serum albumin (BSA). Anti-bacterial performance ( Shewanella loihica ) was also observed for these PDMS/PEG coatings. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016 , 54 , 1612–1623
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 43
·55636-55647
·
IF 0
Yao Zhenxing,Sun Shaohua,Wang Mingquan,Jia Ruibao
The existence of natural organic matter (NOM) causes many problems in drinking water treatment processes. The degradation of different fractions of NOM in drinking water was studied using the ultraviolet/persulfate (UV/PS) process. The NOM was separated into hydrophobic (HPO), transition hydrophilic (TPI) and hydrophilic (HPI) fractions by reverse osmosis and XAD series resins. The effects of degradation were evaluated by dissolved organic carbon (DOC), UV 254 , three-dimensional fluorescence-parallel factor analysis (EEM-PARAFAC), and trihalomethane formation potential (THMFP). The results showed that UV/PS process could remove the three fractions of DOC, UV 254 , as well as the fluorescent components humic acid-like (C1 and C2) and protein-like (C3). The maximum removal rates of DOC of HPO, TPI, and HPI fractions were 34.6%, 38.4%, and 73.9%, respectively, and the maximum removal rates of UV 254 were 72.1%, 86.3%, and 86.8%, respectively. The removal rate of the three fluorescent components can reach 100%, and C3 is easier to remove than C1 and C2 under the low PS dosage conditions. The order of kinetic degradation rate constant of UV 254 first-order reaction is HPI > TPI > HPO. The optimum pH conditions for the degradation of HPO, TPI, and HPI fractions were acidic, basic, and neutral, respectively. The specific THMFP of HPO was higher than that of TPI and HPI. The specific THMFP of HPO and TPI fractions increased with the increase of radiation time, while the HPI fraction showed the opposite trend. THMFP has different degrees of correlation with DOC, UV 254 , C1, and C2. This study can provide a theoretical basis for the selection of the UV/PS process for drinking water sources containing NOM with different characteristics.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
PubMed
危险品化学品经营许可证（带存储）