Processes
·
2023
·Vol. 11
·期 3
·903
·
IF 3.5
Yajie Wang,Xin Dong,Chengfeng Liu,Peng Cheng,Gilles Mailhot
The decolorization of azo dye Orange II using a UVA-Fe3+-PMS-oxalate system was studied. A series of experiments was performed to investigate the effects of several variables, including the pH, PMS dosage, Fe3+concentration, oxalate concentration, and coexisting anions. The results revealed that a lower pH facilitated the decolorization, and relatively high decolorization efficiency (97.5%) could be achieved within 5 min at pH 3.0. The electron paramagnetic resonance (ESR) and radical quenching experiments revealed that SO4•−played a crucial role in the decolorization of Orange II (85.8%),•OH was of secondary importance (9%), and1O2made a small contribution to the decolorization (5.2%). Furthermore, the formation of•OH in the experimental system strongly depended on HO2•/O2•−. These reactive oxidants were able to directly attack the azo bond of the luminescent group in Orange II and initiate the decolorization process. The efficient UVA-Fe3+-PMS-oxalate system showed great application potential in the treatment of wastewater contaminated by azo dyes.Keywords:PMS activation;Orange II;decolorization;UVA irradiation;Fe3+-oxalate complexes
研究领域:
环境科学
·
化学工程
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高影响因子
JOURNAL OF RARE EARTHS
·
2019
·Vol. 38
·期 2
·124-129
·
IF 2.846
Zhiyong Li,Hong Li,Hong-Tao Sun
Long persistent phosphors have received significant attention owing to their attractive photophysical properties. Here, we report a new long persistent phosphor exhibiting strong ultraviolet A (UVA) afterglow . The phosphors were synthesized by a solid-state reaction method. We find that the obtained phosphors demonstrate super long UVA-afterglow emissions after irradiation by X-ray source, and the afterglow can last more than 50 h. A wide range of experimental characterizations indicate that the Tb 3+ doped fluoride elpasolite phosphors are defective and some fluoride ions are replaced by oxygen ions , which creates electron traps with suitable trap depths. Our results establish that Tb 3+ can act as optical emitters in wide-bandgap hosts that can result in the UVA afterglow. This work enriches the bank of UV long persistent phosphors, and may stimulate more efforts for the design and synthesis of this kind of optical materials .
研究领域:
材料科学
·
发光材料
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光学物理
·
固态化学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Shen Zhang,Songnan Hu,Yan Zhou,Minting Xie,Yuhe Liao,Fengxia Yue
Lignin contains benzene rings, carbonyl groups, and phenolic groups that serve as natural macromolecular UV absorber. However, lignin provides insufficient protection in the UVA region because it lacks a long conjugated structure. In this study, we propose a flavonoids-in-lignin coextraction strategy to improve lignin’s UVA protection performance. Flavonoids-containing lignin was isolated from Musa basjoo (Musa basjoo Siebold) and Moso bamboo (Phyllostachys edulis) leaves using l-cysteine (l-cys)-assisted extraction, and the contents of flavonoids in lignin could be further enhanced by employing non-dewaxed sources. Lignin’s UV-protective performance and antioxidant activity were improved as more flavonoids were reserved. Particularly, lignin isolated from non-dewaxed bamboo leaves (NBL) exhibited the best UV protection performance, achieving a sun protection factor (SPF) value of 40.99 with the addition of 5 wt % lignin into SPF 15 commercial sunscreen, representing a 143% enhancement, and a UVA protection factor (PFA) value of 12.17, reflecting a 109% increment. The sunscreens prepared from flavonoid-rich lignin maintained SPF values exceeding 30 and PFA values exceeding 9 (PA+++) even after 8 h of UV irradiation, indicating their long-term UV-protective properties. Furthermore, flavonoids-in-lignin coextraction demonstrated superior UV-protective performance compared to alkali lignin with adscititious flavonoid extracts. This study leverages the inherent advantages of natural plant cell wall components through a straightforward coextraction strategy, further unlocking the potential of lignin for sunscreen applications.
研究领域:
植物学
·
材料科学
·
化妆品科学
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高影响因子
Frontiers in Marine Science
·
2025
·
IF 3
Liu Gao,Yuanyuan Su,Tariq Mehmood,Zezheng Wang,Licheng Peng,Naiming Zhang
During environmental migration, large plastic fragments can undergo degradation into microplastics (MPs), posing a significant threat to ecosystems. A research gap exists in understanding how MPs age in complex environments. We modeled aging by integrating an aging index with degradation kinetics. This study investigated the degradation of MPs (polyethylene (PE), polypropylene (PP), polystyrene (PS) and polyvinyl chloride (PVC)) exposed to ultraviolet radiation in seawater. Aged MPs exhibited cracks, oxidized particles, and wrinkles on their surfaces. The functional groups experienced stretching (e.g., -OH, C-H, C=O) and bending (e.g., X-H in-plane, C-H in-plane), as identified through Fourier transform infrared spectroscopy (FTIR). Meanwhile, the crystallinity of MPs increased initially but decreased over time. The roughness and carbonyl index (CI) of MPs was increased as the weathering time progressed. mPE and mPP exhibited the most pronounced aging. The Elovich kinetic model poorly fitted the CI for aged MPs. A First-order kinetic improvement model fitted well but lacked clear parameter significance. The degradation mechanisms of mPE and mPP were similar. The benzene ring structure in mPS and dechlorination experienced by mPVC render them resistant to degradation. This study provides evidence that that enhances our understanding of the mechanisms underlying the aging process of MPs in seawater.
研究领域:
环境科学
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材料科学
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生态学
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Longji Li,Mengting Wang,Yanru Zhu,Ziyu Zou,Pin Gao,Xiaoran Li,Yajie Qian,Gang Xue
Ultraviolet A (UVA) as the promising light source in disinfection and photochemical applications is less effective in activating peroxides. Iron is wide spread in natural waters, while Fe(III) is less reactive in degrading organics. In this study, Fe(III) was found to be efficient in promoting the effectiveness of UVA/periodate (PI) in degrading various micropollutants, including carbamazepine (CBZ), sulfamethoxazole (SMX), nitrobenzene (NB), benzoic acid (BA) and tetracycline hydrochloride (TC). Among them, TC degraded with the highest rate constants, which was further confirmed to be driven by the generation of Fe(III)-TC complex. Fe(III)-TC complex facilitated the reduction of Fe(III) to Fe(II), and this reduction would be further accelerated by UVA. The generated Fe(II) thereafter enhanced the efficiency of PI activation. Scavenger combined with probing experiments preliminarily demonstrated TC degradation was based on • OH , IO 3 • dominated radical oxidation and 1 O 2 , Fe(IV) dominated nonradical oxidation. Electron paramagnetic resonance (EPR) combined with probing test further confirmed the • OH , IO 3 • , and 1 O 2 , Fe(IV) involved TC oxidation process. The degradation process was little influenced by water matrices. Cl − and NO 3 − even slightly promoted TC degradation through reduction the solution pH, since acidic condition was more favorable by TC degradation. Excessive humic acid (HA) would hinder TC degradation, as UVA transparency would be reduced by HA. The degradation of TC in the Fe(III)/UVA/PI system proceeded through multiple pathways involving oxidation, deamination, demethylation, ring-opening. Ecotoxicity analysis targeting on E. coli . Found the toxicity of TC intermediates increased, while the end products were nontoxic. Fe(III)/UVA/PI was efficient in inactivating E. coli. , which highlighted the application in water purification as the dual roles of oxidation and disinfection.
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高影响因子
ACS Applied Optical Materials
·
2026
·
IF 3.4
Li Hongyang,Wang Shan,Yuan Meng,Zuo Ling,Meng Xiangdong,Yuan Long
Ultraviolet
A (UVA) irradiation poses a health risk, as excessive
skin exposure may lead to serious skin diseases. Therefore, monitoring
the cumulative dose of UVA radiation received by the human body over
the course of a day is of great importance. In this study, we propose
a dual-phase synergistic photochromic strategy based on crystallinity-regulated
amorphous/crystalline WO 3 for rapid UVA indication and
cumulative UVA dose recording. Benefiting from the synergistic enhancement
mechanism at the amorphous–crystalline interface, the optimized
WO 3 @400 test paper exhibits outstanding photochromic performance.
Upon UVA irradiation, the test paper exhibits a rapid and visually
distinguishable color transition from yellow-green to blue-green.
It shows a high sensitivity (Δ E = 9.6 within
3 s under 10 mW/cm 2 ) and a large color difference (Δ E = 44.65 after 420 s under 120 mW/cm 2 ). Moreover,
the visible/NIR absorption increases markedly after UVA irradiation,
with an absorbance difference of 74% at 885 nm, further confirming
its excellent photochromic coloration capability associated with polaron
absorption. On this basis, two types of test papers with different
dose response ranges were fabricated: the low-dose test paper has
a response range of 0–100 mJ/cm 2 , serving
as a cumulative monitoring threshold for low-intensity UVA exposure
over a short period (e.g., indoors near a window or on a cloudy day);
the high-dose test paper has a response range of 0–1000 mJ/cm 2 , matching the unweighted 8-h occupational exposure limit
for UVA (315–400 nm) established by the International
Commission on Non-Ionizing Radiation Protection (ICNIRP). Both test
papers exhibit progressive and dose-dependent color evolution with
increasing cumulative UVA dose. Furthermore, by mixing samples with
different crystallinities, the color gradient can be further tuned
to meet diverse application requirements. Therefore, the constructed
UVA detection test paper enables visual monitoring of the cumulative
UVA dose, providing a simple, low-cost, portable, and power-free technical
approach for personal UVA protection.
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DOI
高影响因子
Journal of Environmental Sciences
·
2024
·
IF 5.9
Chenyan Hu,Yihui Wu,Zhengyu Dong,Ziyi Dong,Shengjie Ji,Lili Hu,Xinyu Yang,Hao Liu
A mixed oxidant of chlorine dioxide (ClO 2 ) and NaClO was often used in water treatment. A novel UVA-LED (365 nm)-activated mixed ClO 2 /NaClO process was proposed for the degradation of micropollutants in this study. Carbamazepine (CBZ) was selected as the target pollutant. Compared with the UVA 365 /ClO 2 process, the UVA 365 /ClO 2 /NaClO process can improve the degradation of CBZ, with the rate constant increasing from 2.11×10 −4 sec −1 to 2.74×10 −4 sec −1 . In addition, the consumption of oxidants in the UVA 365 /ClO 2 /NaClO process (73.67%) can also be lower than that of UVA 365 /NaClO (86.42%). When the NaClO ratio increased, both the degradation efficiency of CBZ and the consumption of oxidants can increase in the UVA 365 /ClO 2 /NaClO process. The solution pH can affect the contribution of NaClO in the total oxidant ratio. When the pH range of 6.0-8.0, the combination process can generate more active species to promote the degradation of CBZ. The change of active species with oxidant molar ratio was investigated in the UVA 365 /ClO 2 /NaClO process. When ClO 2 acted as the main oxidant, HO• and Cl• were the main active species, while when NaClO was the main oxidant, ClO• played a role in the system. Both chloride ion (Cl – ), bicarbonate ion (HCO 3 – ), and nitrate ion (NO 3 – ) can promote the reaction system. As the concentration of NaClO in the reaction solution increased, the generation of chlorates will decrease. The UVA 365 /ClO 2 /NaClO process can effectively control the formation of volatile disinfection by-products (DBPs), and with the increase of ClO 2 dosage, the formation of DBPs can also decrease.
研究领域:
环境科学
·
化学工程
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DOI
PubMed
高影响因子
JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY
·
2025
·
IF 3.1
Lu Hu,Zhenhai Huang,Jiyu Weng,Chujie Huang,Lanyue Zhang
Ultraviolet (UV) radiation often causes skin aging, inflammation, cancer and other related skin diseases. In this study, the main components of Tricholoma matsutake extract (TME) were identified using UPLC-Q-TOF-MS, and their anti-photoaging effects were assessed through UV-induced cell and animal models. The key components identified were D-mannitol (27.41%), DL-malic acid (14%), alginate (12.5%), isoleucine (4.82%), and phenylalanine (4.31%), all of which played roles in anti-aging and UV protection. TME (50-100 mg/ml) significantly alleviated UVA/UVB-induced erythema and wrinkles in mice. Pathological staining showed that TME suppressed UV-induced epidermal hyperplasia ( p < 0.05), reduced collagen damage ( p < 0.01), and decreased mast cell infiltration ( p < 0.01), while down-regulating inflammatory markers such as IL-6, IL-1β, and TNF-α. TME also upregulated type I collagen (COL-1). Flow cytometry results demonstrated that high-dose TME inhibited UV-induced apoptosis and reduced reactive oxygen species (ROS) in HaCaT cells ( p < 0.05). Immunofluorescence and scratch migration assays showed that TME promoted PPAR-α expression, reduced inflammation, and supported skin repair ( p < 0.01). Transcriptomic and metabolomic analyses indicated that TME regulated inflammation-related signaling pathways, helping to prevent skin aging. TME is a promising natural product for skin care and treatment of oxidative stress and inflammation-related diseases.
研究领域:
药理学
·
皮肤病学
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分子生物学
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DOI
PubMed
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 10
·2029
·
IF 4.324
Runqing Geng,Yuanyuan Ren,Rong Rao,Xi Tan,Hong Zhou,Xiangliang Yang,Wei Liu,Qunwei Lu
Titanium dioxide nanoparticles (nano-TiO2), as a common nanomaterial, are widely used in water purification, paint, skincare and sunscreens. Its safety has always been a concern. Prior studies have shown that ultraviolet A (UVA) can exacerbate the toxicity of nano-TiO2, including inducing cell apoptosis, changing glycosylation levels, arresting cell cycle, inhibiting tumor cell and bacterial growth. However, whether the combination of UVA and nano-TiO2cause cell necrosis and its mechanism are still rarely reported. In this study, we investigated the cytotoxicity and phototoxicity of mixture crystalline nano-TiO2(25% rutile and 75% anatase, 21 nm) under UVA irradiation in HeLa cells. Our results showed that the abnormal membrane integrity and the ultrastructure of HeLa cells, together with the decreased viability induced by nano-TiO2under UVA irradiation, were due to cell necrosis rather than caspase-dependent apoptosis. Furthermore, nano-TiO2and UVA generated the reactive oxygen species (ROS) and caused the mitochondrial permeability transition pore (mPTP) of HeLa cells to abnormally open. Cell viability was significantly increased after adding vitamin C (VC) or cyclosporin A (CsA) individually to inhibit ROS and mPTP. Clearance of ROS could not only impede the opening of mPTP but also reduce the rate of cell necrosis. The results suggest the possible mechanism of HeLa cell necrosis caused by nano-TiO2under UVA irradiation through the ROS-mPTP pathway.Keywords:nano-TiO2;UVA;cell necrosis;reactive oxygen species;mitochondrial permeability transition pore
研究领域:
纳米技术
·
细胞生物学
·
毒理学
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·
IF 5.8
Sun Zuyou,Zhou Jiali,Zhang Hui,Liu Zufan,Tao Shiyong,Xu Jing
The widespread used organoarsenicals have drawn attention for decades due to their potential environment risks. In this study, a heterogeneous system of goethite/oxalate irradiated using UVA light ( λ = 365 nm) was applied for the removal of ASA, a kind of organoarsenicals used in animal feeding operations as additives, from the aqueous phase through photodegradation. Results showed that the presence of 5 mM of oxalate significantly enhanced the photodegradation efficiency of ASA in the 0.1 g/L of goethite suspended system from 28 to ~100% within 180 min reaction at pH 5. Acid conditions favored the photoreaction rate, compared with neutral and basic conditions. This reaction process was also influenced by the initial concentration of oxalate and ASA. Furthermore, the mechanism study was conducted by quenching experiments and revealed the important roles of ·OH in the degradation of ASA in the goethite/oxalate/UVA system. By analyzing the reaction products, both inorganic arsenic (As(III) and As(V)) and ammonia were detected during the photodegradation of ASA. These findings help to gain a better understanding of the geochemical behavior of ASA in surface water and can also provide a potential treatment method for the organoarsenicals contaminated water.
研究领域:
环境科学
·
水处理
·
光化学
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DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Bo-Mei Liu,Yue Lin,Yingchun Liu,Shanqing Zhang,Jing Wang,Hui Zhang,Jesse Zhu
Ultraviolet (UV) emitting persistent luminescence (PersL) materials have aroused significant interest, owing to their unique self-illuminating high-photo-energy feature under excitation-free conditions. In particular, the advent of X-rays as a charging source for UV PersL has facilitated the control of PersL properties and triggered a breakthrough in possible applications such as X-ray imaging techniques, phototherapy, photocatalysis, and optical information storage. Here, we present novel PersL materials that exhibit ultra-long UV emission for over 2000 h, as detected with a spectrometer. Experimental characterization revealed that the intrinsic oxygen vacancies associated with the local structure of the perovskite LaGaO3 can function as traps, which have super capabilities in energy collection and storage triggered by X-ray irradiation. Notably, this design concept is guided by utilizing an oxygen-defect perovskite as a host, which can serve as powerful guidance for expediting the discovery of new PersL materials. Moreover, due to excellent UV PersL performances, the proposed photodynamic therapy (PDT) platform LaGaO3:Bi,Sb@g-C3N4 demonstrates excellent PDT efficiency in vivo using low-dose X-ray irradiation. Our discovery of this UV PersL material is expected to provide directional solutions and novel perspectives for the development and application of UV luminescence technology.
研究领域:
材料科学
·
医学
·
光学工程
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DOI
高影响因子
Journal of Hazardous Materials Advances
·
2026
·
IF 9.1
Wenqi Li,Ying Cao,Quanzhen Yang,He Liu,Stefanos Giannkis,Jin Jiang
UVA-driven iron-mediated sulfite advanced oxidation processes have demonstrated high efficiency in degrading organic pollutants, yet their potential for microbial inactivation remains underexplored. This study systematically investigates the disinfection performance and mechanism of a UVA/Fe(III)/sulfite system using Escherichia coli ( E. coli ) as a model bacterium. The ternary system exhibited synergistic bactericidal activity, achieving complete inactivation of 10 6 CFU/mL E. coli within 45 min at pH 5.6, significantly outperforming individual or binary controls. Radical quenching and electron paramagnetic resonance (EPR) analyses identified sulfate radicals ( SO 4 • − ) , hydroxyl radicals ( • OH ) , superoxide ( O 2 • − ) , and peroxymonosulfate radicals ( SO 5 • − ) as the primary reactive species, generated via a sustained photochemical Fe(II)/Fe(III) redox cycle. Mechanistic investigations revealed a multi-target oxidative cascade: initial disruption of cell envelope integrity and lipid peroxidation facilitated intracellular radical influx, leading to rapid adenosine triphosphate (ATP) depletion, inactivation of antioxidant enzymes (superoxide dismutase (SOD) and catalase (CAT)), and oxidative deoxyribonucleic acid (DNA) lesions. Disinfection efficiency increased with decreasing pH, and was promoted by elevated dissolved oxygen. While chloride and nitrate exhibited moderate interference, phosphate and humic acid severely inhibited inactivation through Fe(III) precipitation and radical scavenging/light screening, respectively. These findings elucidate the inactivation pathways of the UVA/Fe(III)/sulfite system, establishing a theoretical foundation for its application as a cost-effective, solar-driven water disinfection strategy.
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高影响因子
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