Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Xin Mao,Bin Liu,Liu Yang,Nan Li,Guangchao Li,Pengwei Yan
The persistent presence and detection of pharmaceuticals and personal care products in wastewater pose a significant threat to environmental health and efficient wastewater treatment. Herein, a multiphase activation system of molybdenum disulfide (MoS 2 ) and peroxymonosulfate (PMS) driven by far ultraviolet at 222 nm (UV 222 ) was developed for their removal. This system achieved complete degradation of diatrizoic acid (DTA) within 20 min and significantly reduced total organic carbon in secondary effluent. The high photon energy of UV 222 could efficiently catalyze MoS 2 and activate PMS, thereby enhancing the kinetics. Additionally, the adsorption of PMS onto the active sites of MoS 2 promoted the formation of a multi-radical generation network. Characterization results indicated that the redox cycling of Mo(IV)/Mo(VI) continually drove the decomposition of PMS to generate SO 4 ·⁻, while the low production ratio of Mo(VI) facilitated multiple efficient cycles. Mass spectrometry analysis revealed twelve intermediates formed during the degradation of DTA through deiodination, hydroxylation, iodine substitution, and amide hydrolysis. The generation of SO 4 ·⁻ and ·OH constitutes the main mechanism for DTA degradation. Moreover, ECOSAR predictions revealed that deiodination played a critical role in reducing the ecological toxicity of DTA transformation products. This study presents an innovative UV₂₂₂-driven advanced oxidation process that overcomes the limitations of conventional photocatalysis and Fenton-like systems—such as narrow pH windows, excessive oxidant requirements, and ionic interference, offering a robust and efficient strategy for the removal of emerging contaminants from wastewater.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2025
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IF 11.3
Yu-Jia Nong,Qian-Yuan Wu,Yuan-Chu Qin,Zi-Bo Jing,Er-Dong Wang,Qing Bai,Wen-Long Wang
UV/sulfite technologies offer promising advanced reduction processes (ARPs) for the degradation and dehalogenation of halogenated organic compounds (HOCs), but are limited by the low absorption of sulfite at a conventional wavelength of 254 nm (UV254). This study introduces a wavelength-optimized far-UVC KrCl* lamp (UV222)/sulfite as transformative ARPs. Sulfite exhibited 45.6-fold stronger absorption at 222 nm compared with 254 nm, coupled with a higher innate quantum yield (Φinnate) of 0.128 mol·Ein–1 versus 0.115 mol·Ein–1. This wavelength optimization generated 29.2-fold higher steady-state concentration of eaq–, with optimal performance at basic pH (>9) and moderate sulfite dosages (0.4–0.75 mM). HOC degradation and dehalogenation showed clear structure-dependent patterns. The enhancive effect of UV222 over UV254 negatively correlated with HOCs’ susceptibility to UV photolysis due to competitive absorption between sulfite and target compounds. Electron-withdrawing halogens significantly favored reductive degradation over oxidation, enabling UV222/sulfite to outperform UV222/H2O2 by 1.3–37.1 times in degradation and 1.9–48.6 times in dehalogenation efficiency, with prominent enhancement particularly for polyhalogenated HOCs. In real water matrices, nitrate and nitrite inhibited HOCs’ degradation through UV absorption and eaq– scavenging. Compared with UV254/sulfite, UV222/sulfite reduced energy costs by 92.7% and required lower sulfite doses. This study provides insights into the wavelength-matching mechanism for UV/sulfite, offering an economical and efficient solution for the remediation of recalcitrant HOCs.
研究领域:
环境科学
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光化学
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水处理
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化学工程
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污染修复
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WATER RESEARCH
·
2025
·
IF 12.4
Xiaoxiang Cheng,Yaoyao Feng,Peijie Li,Kunyu Chen,Tao Yang,Yan Jin,Xinsheng Luo,Daoji Wu
Fouling of ultrafiltration (UF) membranes by natural organic matter (NOM) remains a persistent challenge. Herein, far-ultraviolet (Far-UVC) photolysis of chlorine was developed as a pretreatment to solve the membrane fouling problem arising from NOM. The findings demonstrated that Far-UVC/NaClO pretreatment efficiently increased membrane flux while reducing reversible and irreversible fouling resistance by 80.0 % and 47.1 %, individually. Specifically, Cl • , ClO • and HO • were identified by quenching and probing experiments to play key roles in NOM degradation. Interfacial free energy analysis revealed that Far-UVC/NaClO pretreatment markedly enhanced the repulsive force between contaminant and membrane, thus reducing the tendency of membrane pore clogging. Through molecular-level reaction analysis, unsaturated and aromatic compound macromolecules were decomposed into small molecules, thus reducing membrane pore clogging. Mass difference analysis further revealed the degradation pathways of NOM, which mainly included decarboxylation, dealkylation, and oxygen addition reactions. Moreover, chlorine disinfection by-products (Cl-DBPs) such as trichloroacetic acid, dichloroacetic acid, chloral hydrate and trichloromethane were detected following post-chlorination. Subsequent UF process effectively reduced the formation of DBPs by 19.3–34.3 %. This study demonstrates the application potential of Far-UVC-based oxidation technology to mitigate membrane fouling resulting from NOM.
研究领域:
环境工程
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水处理技术
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膜分离科学
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氧化过程
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天然有机物化学
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自由基反应机理
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消毒副产物控制
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WATER RESEARCH
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2024
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IF 11.4
Yu-Jia Nong,Qian-Yuan Wu,Yun-Peng Wu,Ju-Won Lee,Min-Yong Lee,Wen-Long Wang
The KrCl-excimer lamp, emitting far-UVC light at 222 nm (UV222), offers a promising alternative to conventional UVC light at 254 nm (UV254) for the photolysis of organic pollutants and the activation of radical sensitizers. This study was aimed to investigate the efficiencies of UV222 in the treatment of halogenated aromatics, focusing on its performance in degradation, dechlorination and detoxification. Chlorophenols, representative recalcitrant and toxic halogenated aromatics, were used as target pollutants. The pathways of direct photolysis, photooxidation and photoreduction under UV222 illumination were compared. UV222 outperformed UV254 in photolyzing chlorophenols (1.4−34.1 times faster), especially protonated chlorophenols, due to substantially higher UV absorption (17.1−108.0 times) and quantum yields (2.1−3.4 times). The quantum yields of chlorophenols were influenced by the inducive electron-withdrawing effect of Cl-substitutes. Moreover, UV222 improved the dechlorination of chlorophenols to 95 % compared to 60 % by UV254. The introduction of radical sensitizer (e.g., H 2 O 2 , nitrate, and sulfite) reduced 4-chlorophenol photolysis by competing for UV222 absorption, though the sensitizers partially increased radical oxidation via generating • OH or e aq − . UV222 photolysis of 4-chlorophenol increased the toxicity by 88.6 times through forming toxic intermediates (e.g., hydroquinone and resorcinol). Notably, • OH and e aq − (i.e., UV222/H 2 O 2 and UV222/sulfite) increased the dechlorination and • OH (i.e., UV222/H 2 O 2 ) detoxified the mixture solution. Moreover, UV222 photolysis remained effective for 4-chlorophenol removal in real paper-mill wastewater, indicating the potential application of KrCl* lamp UV222.
研究领域:
环境科学
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化学工程
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APPLIED CATALYSIS A-GENERAL
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2018
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IF 4.521
Wenjuan Shuai,Cun Liu,Yuheng Wang,Fengxiao Zhu,Dongmei Zhou,Juan Gao
Diethyl phthalate ester (DEP) can be degraded in Fe 3+ -UV- aliphatic/phenolic carboxyl acids systems, and the degradation can be significantly influenced by different physical chemical properties of the organic acids. In this study, a density function theory (DFT) approach combined with multilinear regression analysis demonstrates that the lowest unoccupied molecular orbital energy ( E LUMO ) significantly negatively influenced DEP degradation. The correlation coefficient of the regression is −19.3 mM L −1 h −1 . The standardized partial correlation coefficient is −0.674. The aliphatic acids group has higher catalytic ability than the phenolic carboxyl acids group, and by shifting the dominant LUMO configuration from C 3s3d to Fe 4s3d orbitals, Fe 3+ significantly accelerates the catalytic reactions of the aliphatic acids/UV systems. Further analysis demonstrates that electron withdrawing hydroxyl group on the aliphatic acids increases the photo catalytic effects of aliphatic acids/UV system. This study highlights the important role of E LUMO of organic acids on their photocatalytic ability towards degradation of organic pollutants .
研究领域:
环境科学
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化学
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CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
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2024
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IF 1.2
Guofen Zhou,Linlin Yu,Wenlong Guo,Zhongwei Jiang,Lianzhe Hu,Min Wang
In this study, nanozyme is used for monitoring the dose of ultraviolet (UV) in sunlight for the first time. We find that nitrogen-doped carbon dots (N-doped C-dots) can effectively catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) under different UV region including UVA, UVB, and UVC. In comparison, the N-doped C-dots fail to show the catalytic activity under visible light. The finding is applied for distinguishing UV light and visible light through the color change of TMB. More importantly, the photo-oxidation TMB catalyzed by N-doped C-dots can work well in a near neutral pH, which is beneficial for its application in wearable device due to the reducing of acid corrosion. Finally, a wearable bracelet is fabricated by integrating N-doped C-dots and TMB into hydrogels. The bracelet is used for monitoring the UV exposure in sunlight. The color change of TMB in the bracelet can be clearly observed by naked eyes or quantified by a smartphone. The bracelet is also used for distinguishing different weather condition such as sunny/cloudy or different place such as indoor/outdoor during a sunny day. This study provides the first example of nanozyme in wearable UV sensor and will stimulate the applications of nanozyme in wearable device.
CAS / MDL:
研究领域:
材料科学
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纳米技术
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可穿戴技术
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环境监测
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光化学
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高影响因子
MOLECULES
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2024
·Vol. 29
·期 8
·1872
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IF 4.2
Daihua Hu,Yulin Wang,Fanshu Kong,Danni Wang,Chingyuan Hu,Xu Yang,Xiaohua Chen,Wang Chen,Zili Feng
Further assessment of ultraviolet C light-emitting diode (UVC-LED) irradiation for influencing shiitake mushrooms’ (Lentinus edodes) volatile and sensory properties is needed. In this study, a comparison of UVC-LED irradiation treatment on the flavor profiles in various parts of shiitake mushrooms was conducted using gas chromatography–ion mobility spectrometry (GC-IMS) and sensory analysis. Sixty-three volatile compounds were identified in shiitake mushrooms. The fresh shiitake mushrooms were characterized by the highest values of raw mushroom odors. After UVC-LED treatment, the content of C8 alcohols decreased, especially that of 1-octen-3-ol, while the content of aldehydes increased, especially the content of nonanal and decanal. The score of fatty and green odors was enhanced. For fresh samples, the mushroom odors decreased and the mushroom-like odors weakened more sharply when treated in ethanol suspension than when treated with direct irradiation. The fruit odors were enhanced using direct UVC-LED irradiation for fresh mushroom samples and the onion flavor decreased. As for shiitake mushroom powder in ethanol suspension treated with UVC-LED, the sweaty and almond odor scores decreased and the vitamin D2content in mushroom caps and stems reached 668.79 μg/g (dw) and 399.45 μg/g (dw), respectively. The results obtained from this study demonstrate that UVC-LED treatment produced rich-flavored, quality mushroom products.
研究领域:
食品科学
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农业工程
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分析化学
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感官评价
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高影响因子
LANGMUIR
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2022
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IF 4.331
Yiping Chen,Zhenze Lou,Zihao Chen,Shuangye Yang,Jiashuo Hu,Jie Wei
In this study, we fabricate magnetic–fluorescent responsive Janus photonic crystal beads (JPCBs) based on poly(styrene-methyl methacrylate-acrylic acid) (p(St-MMA-AA)) colloidal nanoparticles, Fe3O4, and photobase generators used for self-destructive anti-counterfeiting. We synthesize two kinds of photobase generators that can react with fluorescamine to produce various fluorescence colors. A microfluidic method is used to obtain the Janus photonic crystal beads. The upper portions of the JPCBs are photonic crystals assembled with colloidal spheres, whereas the Fe3O4 settles down to the bottom of the JPCBs due to its higher density. Photobase generators are distributed in photonic crystal gaps. Because of the magnetism of the Fe3O4, the JPCBs could be flipped from one side to the other in the presence of a magnet. After being exposed to UVC light and fluorescamine, the JPCBs can fluoresce under UVA light. Then, we create Janus microbeads arrays with various types of beads and apply them to the visitor card, bracelet, and box label to provide irreversible and self-destructive anti-counterfeiting. The JPCBs are capable of being encoded and angle-independently displayed, which are crucial to their applications in anti-counterfeiting, information coding, and array display.
研究领域:
材料科学
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纳米技术
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防伪技术
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光学
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化学
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高影响因子
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