ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2020
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IF 7.864
Qian-Yuan Wu,Lu-Lin Yang,Xin-Yang Zhang,Wen-Long Wang,Yao Lu,Ye Du,Yun Lu,Hong-Ying Hu
Ammonia (NH4+) and hydrogen peroxide (H2O2) have been widely used to inhibit bromate formation during ozonation. However, organic byproducts can also pose a risk under these conditions. During bromate inhibition, the influence of NH4+ and H2O2 on organic byproducts and their toxicity should be elucidated. Our study found that NH4+ suppressed organic bromine, but might result in increased toxicity. Adding 0.5 mg/L of NH4+–N substantially increased both the formation of cytotoxicity and genotoxicity (DNA double-strand breaks) of organic byproducts from 0.6 to 1.6 mg-phenol/L, and from 0.3 to 0.8 μg-4-NQO/L (0.5 mg/L Br–, 5 mg/L O3). NH4+ decreased bromate, but increased the overall toxicity of the integrated byproducts (organic byproducts and bromate). Organic nitrogen measurements and 15N isotope analysis showed enhanced incorporation of nitrogen into organic matter when NH4+ and Br– coexisted during ozonation. NH4+ decreased the formation of brominated acetonitriles, but enhanced the formation of brominated nitromethanes and brominated acetamides. These brominated nitrogenous byproducts were partially responsible for this increase in toxicity. Different from ammonia, H2O2 could reduce both bromate and the toxicity of organic byproducts. In the presence of 0.5 mg/L Br– and 10 mg/L O3, adding H2O2 (0.5 mM) substantially suppressed bromate, cytotoxicity formation and genotoxicity formation by 88%, 63% and 67%. This study highlights that focusing on bromate control with NH4+ addition might result in higher toxicity. Efforts are needed to effectively control the toxicities of bromate and organic byproducts simultaneously.
研究领域:
环境科学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Xixi Chen,Hai Yang,Chaktong Au,Shuanghong Tian,Ya Xiong,Yu Chang
Reduction of potential carcinogenic bromate formation is a big challenge for the application of ozone in the treatment of Br − -containing wastewater. Three CeO 2 nanocrystals individually with exposed (1 0 0), (1 1 0), and (1 1 1) facets were prepared and adopted as catalysts for the ozonation of Br − containing wastewater. It is found that faceted CeO 2 greatly inhibited the bromate formation and simultaneously enhanced the pollutant removal. The catalytic activity follows the order of (1 0 0) > (1 1 0) > (1 1 1). In the presence of CeO 2 (1 0 0), there is 71.4 ± 2.9% of sulfamethoxazole (SMZ) degradation (only 24.9 ± 1.8% in ozone alone). Moreover, the generation of bromate was reduced by 29.6%, 38.8%, 52.4%, 66.4%, respectively, when the initial Br − concentration is 1.0, 2.0, 34.0, 65.0 mg L −1 . Meanwhile, the antibacterial-active groups in most of the identified intermediates were destroyed and much lower biotoxicity of the treated wastewater is observed. The good reducibility and Lewis acidity of CeO 2 (1 0 0) favors the activation of ozone and the redox cycle of ceria. DFT calculations show that ozone facilely dissociates into surface O and O 2 through interaction with the (1 0 0) facet. It is demonstrated that O 2 − , its derivatives (i.e. OH and 1 O 2 ) and surface O are generated and get involved in SMZ degradation. It is noted that O 2 − also functions as a key reductant to convert Ce 4+ to Ce 3+ which reduce HBrO/BrO − and BrO 3 − to Br − and therefore inhibit the formation of bromate. These results indicate that CeO 2 (1 0 0) catalyzed ozonation is a promising advanced oxidation process for the treatment of Br-containing wastewater, and crystal facet engineering is an efficient strategy to enhance the catalytic performance.
研究领域:
环境科学
·
催化化学
·
理论计算
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Yixuan Yu,Yingping Zhao,Haonan Wang,Ping Tao,Xinmin Zhang,Mihua Shao,Tianjun Sun
The presence of hydrogen peroxide (H 2 O 2 ) in ozonation process can resist the formation of carcinogenic bromate (BrO 3 ¯) efficiently, and the bromate depression is closely related with background water qualities, especially in high bromide-containing seawater. In this study, the freshwater and seawater were selected to investigate the effects of H 2 O 2 on ozone (O 3 ) decomposition kinetics, bromide transformation and bromate depression, and the evolutions of BrO 3 ¯ under different scavengers were explored to speculate the primary bromate formation pathways. The results showed that the initial O 3 half-live period (t 1/2 -O 3 ) in seawater was only one-sixth of that in freshwater, and its attenuation rate increased analogously with the increase of H 2 O 2 concentration in both freshwater and seawater. The H 2 O 2 could promote the formation of BrO 3 ¯ via hydroxyl radical (•OH) based bromate pathways, nevertheless higher concentration of H 2 O 2 facilitated the reduction of HOBr/OBr¯ back to Br¯, resulting in 87.0% and 73.2% of BrO 3 ¯ retardment in freshwater and seawater, respectively. The suppression ratios of BrO 3 ¯ were up to 48.4% and 35.3% in freshwater with the addition of •OH and •O 2 ¯ scavengers, and the corresponding depressions in seawater decreased to 35.3% and 12.7%, indicating that •OH was dominant on bromate formation when the concentration of residual ozone was adequate to generate some bromine intermediates, meanwhile H 2 O 2 and •O 2 ¯ functioned as the key reductants for bromate depression. Based on these results, the Br¯ transformation mechanisms via O 3 , •OH, H 2 O 2 , and •O 2 ¯ reactions were speculated, and the feasibility of H 2 O 2 -ozonation was verified for the treatment of high Br¯-containing seawater.
研究领域:
环境科学
·
水处理工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Hua Li,Yumin Wang,Zhiqiang Hou,Xingyu Zhao,Xiao Miao,Guina Ren,Xiaotao Zhu
Solar-powered interfacial evaporation is emerging as a promising way to desalinate water and address global freshwater scarcity. The combination of a high water production rate and salt resistance capacity is highly desirable in the solar steam generation process, yet still challenging to realize. To overcome this problem, a suspended interfacial evaporator was developed using the Janus Ag/PDA textile. The Janus wettability of the Ag/PDA textile facilitated the unidirectional movement of water from the top to the bottom surface. The suspended type design of the Ag/PDA textile evaporator was capable of reducing heat dissipation to bulk water and enhancing localized heat generation significantly under solar illumination, thereby facilitating effective desalination. The steam generation rate reached an impressive 2.96 kg m -2 h −1 under one sun of solar irradiation. Remarkably, no salt crystallisation was observed on the evaporator surface during a 50 h continuous experiment in a highly saline environment (15 wt% NaCl). The remarkable salt inhibition capacity was attributed to three factors, including the salt rejection effect, the salt removal effect, and the salt dissolution effect. It is hoped that this work will inspire the development of a durable solar steam evaporator.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Zhi Fang,Mei-hong Duan,Qiang Qian,Duoduo Chen,Jian Qian,Xingdie Lin,Yinjie Peng
Hydrogel solar evaporators are emerging as a promising platform for solar-powered water purification. However, developing durable and highly efficient light-absorbing hydrogels remains challenging due to inevitable salt accumulation during desalination, difficulties in controlling surface topography, and poor mechanical properties of the hydrogel evaporator. This study employed a simple foam polymerization strategy to fabricate a sponge-like hydrogel with a three-dimensional interconnected porous structure. Additionally, we polymerized a layer of poly(3,4-ethylenedioxythiophene) (PEDOT) on its surface as a photothermal layer. Consequently, we generated a composite hydrogel featuring a distinct “core–shell” architecture comprising a PEDOT shell and a sponge-like hydrogel core layer. The resulting composite sponge-like hydrogel evaporator exhibits a tailored surface topography, exceptional elasticity and toughness, superior hydrophilicity, and excellent photothermal conversion performance. Under simulated sunlight (1.0 kW/m2), the evaporation rate can reach up to 2.83 kg/m2 h while maintaining long-term stability. Furthermore, the composite sponge-like hydrogel demonstrates an excellent self-cleaning ability and effectively inhibits the formation of salt crystals on the evaporation surface even under high concentrations of salt water (10 wt %). In summary, photothermal composite sponge-like hydrogels demonstrate remarkable evaporation and desalination properties that hold promising prospects for sustainable utilization in seawater desalination.
研究领域:
材料科学
·
环境科学
·
能源研究
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Junren Zhu,Wei Ding,Zhenzhen Jiang,Ting Peng,Xintao Tan
Remediating persistent organic contaminants in near-neutral aquatic environments remains a challenge for conventional homogeneous Fe(II,III)-mediated sulfate radical-based advanced oxidation processes (SR-AOPs), which typically require acidic pH or generate hazardous byproducts. This study introduces an electro-activated sulfite process (Fe-EC/S(IV)) employing sacrificial iron electrodes to overcome these limitations. Continuous anodic Fe 2+ release sustains active FeHSO 3 + complexes, enabling efficient S(IV) activation at pH 4−6. Mechanistic analysis identifies SO 4 •− as the dominant oxidant, formed via inner-sphere electron transfer within FeHSO 3 + complexes, followed by aerobic chain reactions (SO 3 •− → SO 5 •− → SO 4 •− ). The system achieves rapid oxcarbazepine degradation (pseudo-first-order constant, k obs = 1.15 min −1 ), representing a 57.5-fold kinetic enhancement over standalone Fe-EC at pH 6. Notably, the process intrinsically suppresses the carcinogenic BrO 3 − formation (<1 μg L −1 ) through the S(IV)-mediated reductive quenching of bromine intermediates, substantially outperforming Fe-EC/peroxomonosulfate systems (11.3 μg L −1 BrO 3 − ). Demonstrating >70% removal in natural waters without pH adjustment or added electrolytes, and broad-spectrum efficacy (77.9–91.7%) across contaminant classes, this electrochemically sustained process offers a novel AOP paradigm integrating the radical-based oxidation with inherent byproduct control for complex water remediation scenarios.
研究领域:
环境化学
·
水污染控制
·
电化学工程
·
高级氧化工艺
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Xin Li,Miao Kan,Tian Wang,Zhixiao Qin,Ting Zhang,Xufang Qian,Yasutaka Kuwahara,Kohsuke Mori,Hiromi Yamashita,Yixin Zhao
Photoelectrochemical generation of reactive chlorine species (PEC-RCS) is a promising approach for wastewater treatment . However, the inevitable byproduct of harmful oxychloride (such as ClO 3 − and ClO 4 − ) severely limits the practical applications of full-spectrum solar-driven PEC-RCS systems. Herein, we investigated three typical photoelectrodes including TiO 2 , WO 3 and BiVO 4 for PEC-RCS system and the formation of RCS and toxic oxychlorides. In BiVO 4 photoelectrochemical cell, the concentration of ClO 3 − was lower than 0.2 mg/L and the ClO 4 − was undetectable within 2 h of reaction. In contrast, the concentrations of ClO 3 − were 2.3 mg/L and 2.7 mg/L in the widely used WO 3 and TiO 2 PEC-RCS processes, respectively, which exceeded the health standard of 0.7 mg/L raised by the European Food Safety Authority (EFSA). We proposed that the valence band dependent photoelectrochemical properties of BiVO 4 photoelectrodes could lead to the restricted HO· radical production and the non-HO·-mediated RCS generation, which synergistically inhibited the ClO 3 − formation in the RCS activation process.
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
ENVIRONMENTAL TECHNOLOGY
·
2018
·
IF 1.666
Xiaojing Zhang,Yue Zhou,Nan Zhang,Siyu Zhao,Han Zhang,Hanfei Zhai,Jie Zhang
Completely autotrophic nitrogen removal over nitrite (CANON) process was an innovative technology for nitrogen removal from wastewater. It is necessary to clear the impact of CuO nanoparticles (CuO NPs) on CANON process since the widespread utilize increased their opportunity for entering into wastewater. In this study, the short-term and long-term effects of CuO NPs on the ammonia removal and extracellular polymeric substance (EPS) secretion were analyzed in the presence of nitrite, with the CuO NPs of 0, 5, 10, 20, 50, 100, 200, and 500 mg L−1, respectively. Results suggested that low concentration of CuO NPs could enhance the ammonia removal. The inhibition threshold of CuO NPs on CANON sludge within short-term exposure was 20 mg L−1, while that of long-term exposure was 10 mg L−1. Both short-term and long-term exposure within CuO NPs significantly impacted the ammonia removal, and both the nitrite and CuO NPs influenced the EPS secretion.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2019
·
IF 5.77
Yunan Lin,Rongrong Chen,Yanjun Zhang,Zhu Lin,Qi Liu,Jingyuan Liu,Yanli Wang,Liangtian Gao,Jun Wang
Porous organosilica intercalated graphene oxide (p-GA) was synthesized via the two-step polymerization method using 1-(2-aminoethyl)-3- aminopropyltrimethoxysilane as monomer. The average pore diameter of p-GA was calculated to be 4.42 nm with the Barret–Joyner–Halenda (BJH) algorithm. Amino and imino groups on the surface of organosilica pore were served as loading sites for molybdate inhibitors(Al 2 (MoO 4 ) 3 ). The controlled release of inhibitor ions from the molybdate loading p-GA (p-GAMo) occurred during the hydrophilic transformation process of the organosilica pores. The p-GAMo was embedded in polyvinyl butyral (PVB) coating and applied on mild steel. The results show that p-GAMo/PVB coating has active inhibition performance and exhibits high impermeability.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Weirui Chen,Xukai Li,Yiming Tang,Jialu Zhou,Dan Wu,Yin Wu,Laisheng Li
A flexible catalyst, Fe-Cu-MCM-41, was employed to enhance diclofenac (DCF) mineralization and inhibit bromate formation in catalytic ozonation process. Greater TOC removal was achieved in Fe-Cu-MCM-41/O 3 process (78%) than those in Fe-MCM-41/O 3 (65%), Cu-MCM-41/O 3 (73%) and sole ozonation (42%). But it was interesting that both Cu-MCM-41/O 3 and Fe-MCM-41/O 3 achieved 93% bromate inhibition efficiency, only 71% inhibition efficiency was observed in Fe-Cu-MCM-41/O 3 . Influence of pH, TBA/NaHSO 3 and detection of by-products were conducted to explore the mechanism. By Pyridine adsorption–IR and XPS, a relationship was found among activity of catalysts, Lewis acid sites and electron transfer effect between Fe (II/III) and Cu (I/II). Fe-Cu-MCM-41 promoted ozone decomposition to generate OH, which accounted for enhanced DCF mineralization. The consumption of aqueous O 3 also suppressed the oxidative of Br − and HBrO/Br − . More HBrO/BrO − accumulated in catalytic ozonation process and less bromate generated. Bromate formation in Fe-Cu-MCM-41/O 3 process was sensitive with pH value, the acidic condition was not favor for bromate formation. Both DCF mineralization and bromate inhibition were influenced by surface reaction. Moreover, Fe-Cu-MCM-41 showed excellent catalytic performance in suppressing the accumulation of carboxylic acid, especially for oxalic acid. Nearly no oxalic acid was detected during Fe-Cu-MCM-41/O 3 process.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Jinfeng Chen,Qingze Zhang,Yuanhong Zhong,Zhaoying Wang,Yakun Guo,Ming Sun,Lin Yu
To address the limitations of molecular sieves and metal oxides in the NH3-SCR of NOx, we synthesized a novel hybrid catalyst by integrating FeNbCe metal oxides with Cu-SSZ-13. The FeNbCe comodification significantly enhanced the low-temperature performance and sulfur resistance of Cu-SSZ-13 while maintaining 100% N2 selectivity across a broad activity window. The incorporation of Fe, Nb, and Ce reduced weak-acid and Lewis-acid sites while increasing strong Brønsted-acid sites, crucial for catalytic activity. The FeNbCe/Cu-SSZ-13 catalyst exhibited an enhanced surface oxygen content and redox capacity, promoting the “fast SCR” pathway and improving N2 selectivity at low temperatures. The FeNbCe oxides synergistically reacted with SO2, protecting Cu2+ active sites from sulfur poisoning and maintaining 100% NOx conversion for 4 h after SO2 introduction, maintaining 85% within 24 h. In situ DRIFTS characterization confirmed the dominance of the Langmuir-Hinshelwood (L-H) mechanism. The FeNbCe modification represents a significant advancement in the field of NH3–SCR catalysis, offering a practical and effective solution to enhance the performance of Cu-SSZ-13 while addressing key challenges such as sulfur resistance and low-temperature activity.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yanming Yang,Shiqi Song,Xiao Miao,Changqing Zhu,Guina Ren,Bo Ge
Interface evaporators are important in the production of clean water, but problems such as surface oil and soluble contamination remain. In this paper, the structure of an evaporator is optimized, and a superhydrophobic NH 2 -UIO-66/Bi 2 WO 6 floating layer replaces the conventional fix layers. Under the action of the polyaniline hydrogel photothermal layer, the evaporation rate is 2.46 kg•m −2 •h −1 . A mechanism analysis demonstrates that the constructed NH 2 -UIO-66/Bi 2 WO 6 is a Z-type heterojunction, and that •OH, •O 2 − and h + play key roles in the degradation process. The band gap width of Bi 2 WO 6 and NH 2 -UIO-66 is calculated to be 2.85 eV and 2.62 eV, respectively. The constructed polyaniline hydrogel photothermal layer has the ability of rapid water transport, where water droplets can spread quickly within 9 ms, and it gives the evaporator an excellent salt suppression ability. The polyaniline hydrogel did not destroy the polyurethane sponge skeleton with growth, which resulted in its mechanical stability. It is hoped that the construction of such evaporators would provide reference for environmental treatment and clean water production.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）