ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2026
·
IF 0
Zhou Baochang,Li Guifang,Pan Zhangbin,Dong Bin,Du Zhenqi,Zhang Baiqiang,Li Mei,Wang Yonglei,Jia Ruibao
At present, the most commonly used advanced oxidation technology for drinking water treatment has the disadvantage of low utilization rate of oxidant. After research and comparison, the UV/H 2 O 2 /Fe(III) combined process selected in this study can effectively degrade sulfamethoxazole (SMX) in water and improve the utilization rate of hydrogen peroxide. The results showed that the removal rate of SMX by UV/H 2 O 2 /Fe(III) process was 96.7%, and the utilization rate of H 2 O 2 was increased by 25%; the UV/H 2 O 2 /Fe(III) combined process also had a good effect on the degradation of fluorescent components and other organic matter in water; the presence of nitrite ion and humic acid significantly reduced the degradation efficiency of SMX, under the condition of nitrite ion concentration of 5 mg/L or humic acid concentration of 10 mg/L, the removal rate of SMX by UV/H 2 O 2 /Fe(III) combined process decreased by 10.68% or 11.92%, respectively. In terms of mechanism research, the reactivity of SMX molecules was theoretically calculated by density functional theory (DFT), and the atoms with higher contribution rate were calculated, and the degradation products and four degradation pathways of SMX were identified and analyzed by mass spectrometry. Finally, the potential ecological toxicity of SMX and its degradation products was predicted by ECOSAR software and luminescent bacteria experiments; it was found that the toxicity of SMX and its degradation products was relatively high at 15 min.
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Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Kang Hoon Lee,June Young Kim,Imtiaz Afzal Khan,Jae Won Lee,Jong-Oh Kim
This study aimed to optimize the ultraviolet (UV)/hydrogen peroxide (H 2 O 2 ) process for degrading chemicals of emerging concern (CECs), such as caffeine (CAF), atenolol (ATL), acetaminophen (ACT), and chlortetracycline (CTC). The CECs used in this study were chosen because they are used in various industries, affect water bodies, and are difficult to degrade using conventional oxidation and biological processes. The individual degradation results revealed that the CAF degradation rate increased from 23 ± 2%–80 ± 4% as the UV/H 2 O 2 dose increased from 1 to 10 mg·L −1 . Similarly, the ATL, ACT, and CTC degradation rates increased from 59.23 ± 2%, 34.21 ± 1.9%, and, 41.36 ± 2.3%–91.24 ± 3%, 68.12 ± 3%, and 91.93 ± 3.1%, respectively. The complex feed water analysis results revealed that CTC had a higher degradation rate than the other targeted contaminants owing to its higher degradation potential. The rate of reaction results revealed that the degradation of these CECs followed the pseudo-first-order reaction, with R 2 > 0.95 in all cases. liquid chromatography with tandem mass spectrometry (LC–MS/MS) was used to identify the degradation products , and the results revealed the presence of low-molecular-weight organic products due to oxidation. The organic products were formed because of the hydroxylation and demethylation of intermediates and photoproducts, which caused a ring opening and generated several low-molecular-weight carboxylic acids before complete mineralization. These results illustrate that the UV/H 2 O 2 process had some significant effects on the complex mixture. However, CTC exhibited a relatively high degradation rate, which is believed to have inhibited the degradation of other chemicals.
研究领域:
环境科学
·
水处理工程
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DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2025
·
IF 2
Lei Chen,Yun Wang,Haiyang Shao,Chengkai Mao,Minghong Wu,Gang Xu
The increasing presence of benzothiazole (BTH) in industrial wastewater poses significant environmental and health risks due to its persistence and toxicity. This study compares UV/persulfate (UV/K₂S₂O₈) and UV/H₂O₂ systems for benzothiazole (BTH) degradation, revealing that UV/K₂S₂O₈ achieves complete BTH removal (100%, 0.189 min−1) versus 85% (0.092 min−1) for UV/H₂O₂ under identical conditions. Radical scavenging experiments and LC-MS analysis demonstrate sulfate radicals outperform hydroxyl radicals in oxidizing BTH heterocyclic structure, reducing intermediates by 63% (quantified via peak area ratios). pH-dependent kinetics show UV/K₂S₂O₈ maintains efficacy (90–100% removal) across pH 3–9, while UV/H₂O₂ efficiency drops to 58% at pH > 7. Practical validation in river water confirms UV/K₂S₂O₈ robustness (98% BTH degradation), positioning it as a scalable, energy-efficient solution for refractory pollutant treatment. The results showed that the oxidant concentration and pH affected the degradation rate of BTH by changing the free radical concentration, and the UV/ K2S2O8 was demonstrated to be able to achieve efficient removal of pollutants in complex environmental matrices. Free radical scavenging experiments and liquid chromatography-mass spectrometry analysis confirm that sulfate radicals are more effective than hydroxyl radicals in oxidizing and degrading BTH, enabling rapid, efficient, and environmentally friendly degradation of pollutants. This is mainly due to the higher redox potential of sulfate radicals (2.8–3.1V) compared to hydroxyl radicals (2.01V), resulting in the generation of fewer intermediates. Compared to UV/H2O2, UV/K2S2O8 is a more effective, cleaner, and energy-saving method for pollutant removal in various complex environmental matrices.
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高影响因子
Food Chemistry-X
·
2024
·
IF 6.5
Min Yang,Liang Tao,Zi-Lin Wang,Ling-Fei Li,Cun-Chao Zhao,Chong-Ying Shi,Jun Sheng,Yang Tian
Moringa oleifera Lam. leaves are a new raw food material rich in polysaccharides. These polysaccharides exhibit various biological properties, including antioxidant, hypoglycemic and immunoregulatory effects. However, the use of Moringa oleifera Lam. leaves polysaccharides (MOLP) may be limited by their large molecular weight ( M W ) and presence of numerous impurities, such as pigments. Research has indicated that degraded polysaccharides usually exhibit high biological activity because of changes in physical structure and chemical properties. In this study, we focused on the extraction of a degraded-modified fraction from MOLP using the Ultraviolet/ Hydrogen peroxide (UV/H 2 O 2 ) method. Specifically, the physicochemical properties and glycosidic bond composition of a particular fraction (UV/H 2 O 2 degraded Moringa oleifera Lam. leaves polysaccharides in 3 h called DMOLP-3) were investigated. In addition, in vitro simulated digestion experiments showed that DMOLP-3 was only partially degraded during gastrointestinal digestion, indicating that DMOLP-3 can be utilised by gut microorganisms. Furthermore, the prebiotic properties of MOLP and DMOLP-3 was studied using an in vitro faecal fermentation model. The results indicated that compared with MOLP, DMOLP-3 led to a decrease in both the colour and M W of the polysaccharides. In addition, this model exhibited enhanced solubility and antioxidant capabilities while also influencing the surface morphology. Moreover, DMOLP-3 can facilitate the proliferation of advantageous microorganisms and enhance the synthesis of short-chain fatty acids (SCFAs). These results provide valuable insights into the utilization of bioactive components in Moringa oleifera Lam. leaves for the intestinal health.
研究领域:
食品科学
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营养学
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生物化学
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微生物学
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药理学
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高影响因子
WATER RESEARCH
·
2018
·
IF 7.051
Tongcai Liu,Kai Yin,Chengbin Liu,Jinming Luo,John Crittenden,Weiqiu Zhang,Shenglian Luo,Qunying He,Yongxiu Deng,Hui Liu,Danyu Zhang
Oxcarbazepine (OXC) is ubiquitous in the aqueous environment. And due to its ecotoxicological effects and potential risks to human, an effective way to eliminate OXC from aqueous environment has aroused public concerns in recent years. Radical-based reactions have been shown to be an efficient way for OXC destruction, but the reactions of OXC with reactive oxygen species (ROS) and carbonate radical (CO 3 •− ) are still unclear. In this study, we focused the degradation of OXC and ROS, CO 3 •− generation mechanism, and their roles in OXC degradation via UV and UV/H 2 O 2 . The triplet state of oxcarbazepine ( 3 OXC ∗ ) was found to play an important role in OXC degradation via UV. And hydroxyl radicals ( • OH) and singlet oxygen ( 1 O 2 ) were found to be the dominant ROS in OXC degradation. Superoxide radical (O 2 •− ) did not react with OXC directly, but it may react with intermediate byproducts. Generation of CO 3 •− played a positive role on OXC degradation for both UV and UV/H 2 O 2 . In addition to • OH, 3 OXC* also contribute to CO 3 •− production. The second-order rate constants of OXC with • OH and CO 3 •− were 1.7 × 10 10 M −1 s −1 and 8.6 × 10 7 M −1 s −1 , respectively. Potential OXC degradation mechanisms by • OH were proposed and included hydroxylation, α-ketol rearrangement, and benzylic acid rearrangement. Compared with non-selective • OH, the reactions involving CO 3 •− are mainly electron transfer and hydrogen abstraction. And the acute toxicity of OXC was lower after UV/H 2 O 2 and UV/H 2 O 2 /HCO 3 − treatments, which was confirmed by luminescent bacterial assay ( Vibrio fischeri bacterium).
研究领域:
环境科学
·
毒理学
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PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Bingliang Zhang,Zhuoyao Fang,Shu Wang,Xifeng Shi,Bo Guo,Jie Gao,Dandan Wang,Wansong Zong
Ozonation and ultraviolet-based advanced oxidation processes (UV-AOPs) play important roles in advanced treatment of municipal wastewater for water reuse . Bromide is widely present in wastewater at different concentration levels (ranging from μg/L to mg/L). However, the effect of bromide on molecular transformation of dissolved effluent organic matter (dEfOM) in real wastewater during ozonation and UV-AOPs treatments still remains unclear. Herein, Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR-MS) was utilized to characterize the overall molecular transformation of dEfOM and the formation of unknown halogenated byproducts (X-BPs) in ozonation, UV/H 2 O 2 , UV/persulfate (UV/PS), and UV/chlorine (UV/Cl) processes in the presence of additional bromide. Compared with the same oxidation processes without additional bromide, the degree of dEfOM oxygenation had some extent decrement with the effect of bromide. A slightly increment of the number of unknown brominated byproducts (Br-BPs) was observed during ozonation, UV/H 2 O 2 , and UV/PS treatments in the presence of additional bromide, and the largest increment of these compounds was found in UV/Cl process. A total of 82 chlorinated byproducts (Cl-BPs) and 183 Br-BPs were detected in all oxidation processes with the effect of bromide, and the number of Br-BPs was significantly higher than that of Cl-BPs. Based on mass difference analysis, 69 pairs of possible precursors/Br-BPs were identified. In addition, the additional bromide did not remarkably increase the concentrations of trihalomethanes (THMs) and haloacetic acids (HAAs) in ozonation, UV/H 2 O 2 , and UV/PS treatments, while the production of THMs and HAAs significantly decreased by 68.06% and 54.55%, respectively, during UV/Cl treatment. The calculated cytotoxicity increased to some extent for each treatment, especially for UV/Cl treatment, and the compound with largest contribution to cytotoxicity was monobromoacetic acid. This study provides new insights into the formation and transformation of X-BPs during advanced treatment of real wastewater with the effect of bromide.
研究领域:
环境科学
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分析化学
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 29
·23219-23225
·
IF 2.741
Wang Lu,Ji Yuefei,Lu Junhe,Kong Deyang,Yin Xiaoming,Zhou Quansuo
The objective of this research was to compare the transformation of Br − and formation of brominated byproducts in UV/persulfate (PS) and UV/H 2 O 2 processes. It was revealed that Br − was efficiently transformed to free bromine which reacted with humic acid (HA) or dihydroxybenzoic acid resulting in the formation of brominated byproducts such as bromoacetic acids (BAAs) in UV/PS system. In contrast, no free bromine and brominated byproducts could be detected in UV/H 2 O 2 system, although the oxidization of Br − was evident. We presumed that the oxidation of Br − by hydroxyl radicals led to the formation of bromine radicals. However, the bromine radical species could be immediately reduced back to Br − by H 2 O 2 before coupling to each other to form free bromine, which explains the undetection of free bromine and BAAs in UV/H 2 O 2 . In addition to free bromine, we found that the phenolic functionalities in HA molecules, which served as the principal reactive sites for free chlorine attack, could be in situ generated when HA was exposed to free radicals. This study demonstrates that UV/H 2 O 2 is more suitable than UV/PS for the treatment of environmental matrices containing Br − .
Graphical abstract
研究领域:
环境科学
·
水处理工程
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 49
·期 1
·23-42
·
IF 3.134
Lin Yingzi,Hou Ao,Li Hao,Shi Chunyan,Chen Lei,Yuan Baoling,Liu Yi,Wang Yu,Liu Xiaochen
Dye wastewater with high concentration, large molecular weight, complex structure, and certain toxicity has brought a serious burden to the environment. In this study, acid red 73 dye (AR73) was used as the model pollutant to compare the degradation effects of different systems on AR73. The influence factors of a UV/hydrogen peroxide/peroxydisulfate (UV/H 2 O 2 /PDS) composite system, such as H 2 O 2 dosage, initial concentration of AR73, initial pH value, anion concentration, and actual water, on the degradation of AR73 were investigated. Compared with other systems, the UV/H 2 O 2 /PDS composite system had the best degradation effect of AR73, with a degradation efficiency of 98.98%, which conforms to the pseudo-first-order reaction kinetic model, the pseudo-first-order reaction kinetic constant ( k obs ) is 0.1339 min −1 . And the synergy coefficients in this complex system were all greater than 2. Specifically, the degradation efficiency of the UV/H 2 O 2 /PDS composite system for AR73 was the highest when the initial pH was neutral. The presence of anions inhibited the degradation of AR73, and the real water reduced the degradation efficiency for AR73. Electron spin resonance (ESR) detection and free radicals capture test demonstrated that hydroxyl radical ( · OH) was the main reactive species in AR73 degradation, and its 80.66–84.93% contribution. With the destruction of the structure of AR73 by free radicals, anilines, phenols, and oxalic acid were found to be the main intermediate products during the degradation of AR73 by gas-phase mass spectrometry and UV–vis spectrograms. The changes in toxicity during the degradation of AR73 by the UV/H 2 O 2 /PDS complex system were also assessed.
研究领域:
环境科学
·
化学工程
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高影响因子
WATER RESEARCH
·
2019
·
IF 7.913
Ying Wan,Pengchao Xie,Zongping Wang,Jiaqi Ding,Jingwen Wang,Songlin Wang,Mark R. Wiesner
In this study, ultraviolet based advanced oxidation processes (UV-AOPs) including UV/persulfate (UV/PS), UV/chlorine, and UV/H 2 O 2 were employed to alleviate ultrafiltration membrane fouling during the treatment of algae-laden water. The results show that UV/PS pretreatment exhibited the best performance on fouling control, followed by the UV/H 2 O 2 pretreatment . The fouling mitigation performance improved with the increase of oxidant dose. However, UV/chlorine pretreatment aggravated membrane fouling, and the irreversible fouling resistance increased by five times compared with that of raw water. The dissolved organic carbon (DOC) in the algae-laden solution was reduced after UV/PS pretreatment, while either UV/chlorine or UV/H 2 O 2 pretreatment had little influence on the DOC of feed water. UV/PS and UV/H 2 O 2 pretreatments were effective in the degradation of fluorescent compounds, thus reducing the deposition of organic matter on the membrane surface. Additionally, the decreased concentration of hydrophobic organics, algal cells, and debris in feed water after UV/PS pretreatment was also contributed to the fouling alleviation. The aggravated irreversible fouling after UV/chlorine pretreatment was probably ascribed to the increased accumulation of hydrophobic fractions in the membrane pores. Modeling result indicates that membrane fouling during the filtration of raw algae-laden water was dominated by intermediate blocking and cake filtration mechanisms. Both UV/PS and UV/H 2 O 2 pretreatments transformed the combined fouling mechanism into standard blocking, while UV/chlorine pretreatment aggravated the pore blocking in the initial filtration period.
研究领域:
环境科学
·
水处理工程
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2016
·
IF 5.31
Wenhai Chu,Dongmei Li,Yang Deng,Naiyun Gao,Yansen Zhang,Yanping Zhu
Free amino acids (AAs) can form trihalomethanes (THMs) and haloacetonitriles (HANs) during chlorination in drinking water treatment plants, but they account for a small fraction of dissolved organic nitrogen (DON) pool in natural waters. In contrast, combined AAs contribute to a greater identifiable DON portion, but the information on the formation and control of THMs and HANs from them is limited. Ultraviolet/hydrogen peroxide (UV/H 2 O 2 ) and ultraviolet/persulfate (UV/PS), two typical UV-based advanced oxidation processes (UV-AOPs), are both promising drinking water technologies for the reduction of trace organic contaminants . The objective of this study is to examine the effects of the two UV-AOP pre-treatments on the formation of carbonaceous and nitrogenous disinfection by-products (C- and N-DBPs), which were indicated by THMs and HANs, respectively, during post-chlorination and chloramination of tyrosine (Tyr) in free and combined forms. Results showed that direct UV photolysis, PS pre-oxidation alone or H 2 O 2 pre-oxidation alone did not significantly impact the THM and HAN formation during subsequent chlorination. However, the two UV-AOP pre-treatments could somewhat alter the DBP formation. In general, under the identical doses (UV irradiation dose and molar oxidant dose), UV/PS pre-treatment better controlled the HANs than UV/H 2 O 2 during AA post-chlorination, though UV/PS might slightly promote the formation of chloroform . In contrast, the two UV-AOP pre-treatments did not obviously affect the THM and HAN formation when post-chloramination was applied. In addition, a marked difference was observed in the speciation of DBPs formed from free AAs and short oligopeptides in the presence of bromide. For free Tyr, more brominated THMs were formed than brominated HANs; but for short oligopeptides, more bromine was incorporated into HANs than THMs.
研究领域:
环境科学
·
水处理工程
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DOI
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Qi Lu,Qi Han,Hongnan Liu,Li Feng,Yongze Liu,Ziwen Du,Liqiu Zhang
Dissolved black carbon (DBC) released from biochar, is an essential group in the dissolved organic matter (DOM) pool and is widely distributed in aquatic environments. In various advanced oxidation processes (AOPs), DBC exhibits enhanced free radical scavenging compared to typical DOM, attributed to its smaller molecular weight and more compacted aromatic structure; however, the molecular-level transformations of DBC in different AOPs , such as UV/H 2 O 2 , UV/PDS, and UV/Chlorine, remain unclear. This study employed a DBC derived from wheat biochar for experimentation. Characterization involved ultraviolet-visible (UV–Vis) spectroscopy and fluorescence excitation-emission-matrix (EEM) spectroscopy, revealing the transformation of DBC through diminished SUVA 254 values and reduced intensity of three-dimensional fluorescence peaks. Further insights into the transformation were gained through Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). After each UV-AOP treatment, a conspicuous augmentation in the oxygen content of DBC was observed. The detailed oxygenation processes were elucidated through mass difference analysis, based on 23 types of typical reactions. Results indicated that oxygenation reactions were most frequently detected in all three UV-AOP treatments. Specifically, the hydroxylation (+O) predominated in UV/H 2 O 2 , while the di-hydroxylation (+2O) prevailed in UV/PDS. UV/Chlorine treatments commonly exhibited tri-hydroxylation (+3O), with the identification of 1194 Cl-BPs of unknown structures. This study contributes to a comprehensive understanding of the molecular transformations of DBC induced by various free radicals in different UV-AOP processes, leading to a better understanding of the different fates of DBC in UV-AOP processes. In addition, the identification of DBC as a precursor of by-products will also contribute to the understanding of how to inhibit the generation of by-products.
研究领域:
环境科学
·
化学工程
·
分析化学
·
水处理
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PubMed
高影响因子
危险品化学品经营许可证（带存储）