ACS ES&T Water
·
2022
·
IF 0
Penghui Du,Wen Liu,Zuomin Rao,Junjian Wang
Peracetic acid (PAA), an alternative disinfectant of chlorine, has drawn increasing attention in the application of wastewater treatment. However, little is known about the influence of water matrices on PAA-induced organic micropollutant (OMP) degradation. Here, we found that the coexisting bromide ions (Br–) in water can trigger the oxidation of OMP during PAA treatment but probably result in higher ecotoxicity. Br– can efficiently decompose PAA with a species-specific rate constant (kPAAH/Br–) of 0.198 ± 0.003 M–1·s–1. The thus generated HOBr led to a significant abatement (31.8–81.3%) of OMPs (17α-ethinylestradiol, sulfamethoxazole, naproxen, and phenol) after a 1 h reaction at pH 7.1. The coexisting H2O2 component in the PAA solution can competitively consume HOBr and inhibit OMP transformation. The OMP degradation in the PAA/Br– process was highly pH-dependent and preferred acidic conditions. Furthermore, a comprehensive model was established to simulate the reaction kinetics of the OMP degradation by the PAA/Br– process with good accuracy. High-performance/electrospray ionization-triple quadrupole mass spectrometry results indicated the generation of various brominated products, with higher model-predicted toxicity than their parent compounds. This work significantly advances the understanding of the role of Br– in OMP oxidation by PAA and alerts the possible environmental health risks.
研究领域:
环境科学
·
水处理
·
化学工程
·
毒理学
✓ 已验证
DOI
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Hengxuan Zhao,Lu Wang,Deyang Kong,Yuefei Ji,Junhe Lu,Xiaoming Yin,Quansuo Zhou
Peroxymonosulfate (PMS), a widely used in situ chemical oxidation agent, has attracted increasing attention in ground water/soil remediation. PMS is relatively stable with lifetime from months to even years in subsurface. The residual PMS can react with various of organics or inorganics species in environment, which may pose long term environmental effects. In this study, reaction between PMS and bromide (Br − ) in water, and thus to the transformation of triclosan (TCS), an antibiotic agent, was studied. We found that TCS cannot be degraded by PMS alone but was efficiently removed in the presence of both PMS and Br − . This was due to the formation of free bromine upon the oxidation of Br − by PMS. Formation of bromine radical (Br ) in PMS/Br − system was unlikely according to quenching tests. Reaction between free bromine and TCS generated brominated TCS intermediates which underwent further degradation to brominated disinfection byproducts (DBPs), of which bromoform (CHBr 3 ) and dibromoacetic acid (DBAA) were the most prominent ones. Their yields reached 1.31 µM and 0.49 µM in 24 h, respectively, when 1 mg/L TCS was treated with 100 µM PMS and 100 µM Br − . Presence of humic acid (HA) remarkably enhanced the formation of monobromoacetic acid (MBAA), DBAA, and bromochloroacetic acid (BCAA) but inhibited the formation of CHBr 3 and dibromochloromethane (CHClBr 2 ). Thus, even though certain phenolic contaminants like TCS can be effectively removed in PMS/Br − system, formation of free bromine and DBPs makes it not a good treatment strategy. Particular attention should be paid when Br − is presented in PMS-based oxidation process.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Jun Hu,Jiangzhou Luo,Yuxuan Zhao,Min Chen,Honglei Ling,Xiaoting Zhou,Song Xue
Constructing membranes that possess both exceptional gas transport property and strong resistance to CO 2 -induced plasticization is a crucial need in membrane separation , yet it still stands as an ongoing challenge. In present study, we firstly added the bromine atom into the 2, 2′-bis(trifluoromethyl)benzidine (TF) to synthesis two new bromine substituted diamines, and subsequently one of the brominated diamines was employed as a comonomer alongside commercial tris(4-aminophenyl)amine (TAPA) and dianhydride 6FDA to prepare the network polyimide (PI) membrane via copolymerization . Following this, these new brominated PIs would undergo debromination process during the subsequent heating treatment. As a result, the bromination/debromination effect created new microporosity , which increased the d-spacing and BET surface area of the membrane, thereby largely enhancing the crosslinked PI membrane’s gas separation performance. Moreover, the robust network structures achieved through in-situ crosslinking way, derived from a segment of trifunctional TAPA monomers , enhance the resultant membrane's resistance to CO 2 plasticization issue. An exemplified membrane referred to as 6 F-TA/TF-dBr-450 membrane displays outstanding CO 2 /CH 4 separation capabilities, with a CO 2 permeability of 1420.56 Barrer and a CO 2 /CH 4 selectivity of 39.67, surpassing the 2008 Roberson upper bound by a considerable margin. Besides, this membrane demonstrates outstanding durability against CO 2 -induced plasticization, showcasing its strength under pressures of at least 35 Bar.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2018
·
IF 6.653
Juan Wang,Zhineng Hao,Fengqiong Shi,Yongguang Yin,Dong Cao,Ziwei Yao,Jingfu Liu
Although brominated disinfection byproducts (Br-DBPs) have been reported to form from reactions between bromide, dissolved organic matter (DOM), and disinfectants, their formation during the disinfection of aquaculture seawater via chlorination has been rarely studied. Herein, after 5 days of disinfection of raw aquaculture seawater samples with sodium dichloroisocyanurate (NaDDC), trichloroisocyanuric acid (TCCA) and chlorine dioxide (ClO2), 181, 179, and 37 Br-DBPs were characterized by ultrahigh-resolution Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Sunlight irradiation of the chlorinated aquaculture seawater with TCCA and NaDDC was found to reduce the formation of Br-DBPs, possibly due to the photodegradation of the important HBrO/HClO intermediate and the degradation of formed Br-DBPs. The formation of Br-DBPs chlorinated by ClO2 increased under sunlight irradiation. The number of Br-DBPs formed during chlorination processes agreed well with the total organic bromine (TOBr) content measured by inductively coupled plasma mass spectrometry (ICP-MS). Most of the Br-DBPs were highly unsaturated and phenolic compounds, which were primarily generated through electrophilic substitution by bromine coupled with other reactions. In addition, some emerging aromatic Br-DBPs with high relative intensities were also assigned, and these compounds might be highly lipophilic and could potentially accumulate in marine organisms. Our findings call for further focus on and investigation of the Br-DBPs produced in chlorinated aquaculture seawater.
研究领域:
环境科学
·
海洋生物学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Fanyong Yan,Qianghua Ye,Jinxia Xu,Juanjuan He,Li Chen,Xuguang Zhou
A novel fluorescent sensor based on carbon dots (CDs) was synthesized for direct determination of glutathione (GSH), which bromoacetyl bromide was functionalized CDs (CDs-Br) sensing system for the first time. The bromoacetyl bromide functional groups (halogen moiety) can quench the fluorescence of CDs, which were substituted by the -SH group, could lead to a significant fluorescence increase of CDs-Br via the halogen substitution cyclization. This method could effectively immediately detect amino acids with thiols and it needn’t to be combined with metal ions. Under optimum conditions, the probe has a good selectivity for GSH over other various biologically relevant species and even two other similar biothiols (Cys/Hcy) and could image GSH in living cells.
研究领域:
分析化学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Guofu Huang,Mianmian Wang,Yongyou Hu,Jianhua Cheng,Sihao Lv,Kui Yang
As a typical congener of Polybrominated diphenyl ethers (PBDEs), 2,2′,4,4′-tetrabromodiphenyl ether (BDE47) has attracted more and more attention due to its high biological toxicity and environmental abundance. In this study, a novel polyanionic cellulose stabilized Pd/Fe (PAC-Pd/Fe) nanoparticle was successfully synthesized for BDE47 degradation under ambient condition. Batch experiments showed that BDE47 degradation followed pseudo first-order kinetic model. Pd loading played a crucial role as it affected the formation of activated hydrogen species H ∗ and accelerated electron transfer. At Pd loading of 0.3 wt%, nearly 100% BDE47 was degraded completely within 10 min by 0.4 g L −1 PAC-Pd/Fe nanoparticles. When compared with strong acidic (pH 3) and alkaline (pH 9 and 11) conditions, weak acidic condition (pH 5) was more favorable for BDE47 degradation, with nearly 100% BDE47 was removed within 7.5 min. In the presence of HA inhibited the degradation of BDE47, and the degradation efficiencies within 15 min decreased from 100%, 88.6%, 79.5% to 73.1% as HA concentration increased from 0, 10, 40 to 70 mg L −1 . The degradation of BDE47 by PAC-Pd/Fe nanoparticles was a reductive debromination process, and a stepwise debromination from n-Br to (n-1)-Br BDEs was the dominant reaction, in which the para -Br was more susceptible to remove than ortho -Br. This study suggests PAC-Pd/Fe nanoparticle can be utilized as a promising remediation technology for PBDEs contaminated wastewater.
研究领域:
环境科学
·
污染治理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2015
·Vol. 4
·期 7
·1386-1391
·
IF 4.696
Bing Yu,Feng Zhai,Hailin Cong,Di Yang
Photosensitive polystyrene (PS)/silver bromide (AgBr) hybrid colloidal crystals were prepared using a co-deposition method. After treatment with UV light, the infiltrated AgBr decomposed to silver nanoparticles (Ag-NPs), and PS/Ag-NP hybrid colloidal crystals with enhanced structural colours were obtained. The enhanced structural colors are due to the absorption of incoherent scattering light and increase in color saturation by the embedded Ag-NPs. The band gaps of the PS colloidal crystals, and PS/AgBr and PS/Ag-NP hybrid colloidal crystals were measured using a UV-vis reflection spectrometer and calculated using Bragg law. The obtained PS/Ag-NP hybrid colloidal crystals could be used as recoverable colorimetric naked eye probes for bromine (Br) gas sensing with a detection limit of 15 mmol L−1 at a sensing time of 50 s. The sensor had a very reliable performance after repeated bromine sensing, and could be mass produced facilely with very low cost.
研究领域:
材料科学
·
化学传感器
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY
·
2014
·
IF 1.862
Yan-Qing Wang,Hong-Mei Zhang,Jian Cao
Decabrominateddiphenyl ether (deca-BDE) and tetrabromobisphenol A (TBBPA) are known as brominated flame-retardants, which are commonly found in the environment. The binding mechanisms of deca-BDE and TBBPA with human serum albumin (HSA) are still unknown. In this report, the interactions of deca-BDE and TBBPA with HSA were investigated using different spectroscopic methods and molecular modeling. The experimental results indicated the formation of complexes between deca-BDE/TBBPA and HSA with different affinity. These interactions affected the secondary structure of HSA. Thermodynamic investigations revealed that hydrophobic forces mainly drove the binding interactions of deca-BDE/TBBPA with HSA. For TBBPA, hydrogen-bonding interactions were also involved in the binding process of TBBPA with HSA. According to the analysis of experimental and theoretical data, we concluded that the binding site of deca-BDE to HSA located in the subdomain IB, while TBBPA was near to subdomain IIA and Trp-214. The binding interactions of deca-BDE and TBBPA with the most prominent carrier protein in the human circulatory system could influence mechanisms of their biochemical processes. Thus, these binding interactions can play central roles in studying the distribution and toxicity mechanisms of brominated flame-retardants.
研究领域:
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Muthuchamy Maruthupandy,Govindan Rajivgandhi,Thillaichidambaram Muneeswaran,Seerangaraj Vasantharaj,Gabriela Sandoval-Hevia,Muniyandi Muneeswaran,Nurul Asyikin Binti Mohamed Radzi
The pervasive occurrence of various organic contaminants, primarily dye molecules, in water bodies was caused by multiple dye industrial wastes, which recently sparked great scientific concern and public awareness due to their potential to spread these contaminants' resistant genes and pose a risk to humans. Cross-linking graphene in chitosan resulted in nanocomposites with varied morphology, increased surface area, and improved photocatalytic removal of bromothymol blue and bromophenol blue. The degradation capacity of photocatalysts at various concentrations (25 and 50 mg) was 96.2 % (170 min) and 99.2 % (80 min) with bromothymol blue, revealing a two-fold variation based on the Gr/Cts NCs concentrations. Similar to bromophenol blue dye molecules, which showed a two-fold enhancement of degradation based on graphene/chitosan nanocomposites concentration, bromophenol blue dye molecules were 95.3 % and 98.6 % at 240 and 120 min time intervals. The bromophenol blue and bromothymol blue dyes degraded according to the Langmuir adsorption model. Furthermore, the minimal cytotoxicity of graphene/chitosan nanocomposites to the human lung epithelial cell line and the human macrophage-like cell line indicates that the material is safe. This study reveals that the degrading properties of graphene/chitosan nanocomposites significantly improve as the concentration increases.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Feng Zhang,Dongyi Zhang,Tong Chang,Hongyan Li,Jiali Cui,Jianguo Cui
In this study, an electrochemically activated persulfate (EAP) process using boron-doped diamond (BDD) as the anode was adopted for the activation of peroxydisulfate (PDS) to treat bromide-containing water. In this EAP process, the activation of PDS to generate SO 4 •- is mainly caused by direct electron transfer at the cathode. The synergetic oxidation by the free radical oxidants, including OH• electrogenerated on the BDD anode and SO 4 •- produced on the cathode, is the major driving force to oxidize bromide to bromate through the continuous stepwise reaction. The cathodic reduction of high-valent bromine compounds coexisting in the EAP process could also affect the distribution of bromine by-products. The bromate formed in the EAP process decreased when humic acid coexisted in the bromide-containing water because the active bromine (Br• and HOBr) could react with organic matter to form brominated by-products. Bromate formation was increased with increasing PDS dosage, initial bromide concentration and current density. An acidic environment is beneficial for inhibiting the formation of bromate, but it might also increase the risk of formation of brominated by-products.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yuanyuan Wang,Lang Du,Xuemin Hu,Wenyan Zhang,Lingyun Hao,Kaining Ding,Hangmin Guan,Yingfei Hu
2,2′,4,4′-tetrabromodiphenyl ether (BDE-47) is a highly toxic organic pollutant. Owing to the high structural stability, BDE-47 is difficult to be naturally decomposed. In this study, Au nanoparticles decorated flower-like ZnIn 2 S 4 microspheres were successfully fabricated and applied for the rapid removal of BDE-47 driven by visible-light irradiation. It was revealed that 3 wt% Au-loaded ZnIn 2 S 4 (Au/ZnIn 2 S 4 ) has the highest removal rate for BDE-47 (0.90118 h −1 ). A study of the reaction path and mechanism shows that the bromine adjacent to the oxygen atom in BDE-47 tends to be removed via electron transfer. This is attributed to the band-gap excitation of ZnIn 2 S 4 , the surface plasmon resonance effect of the Au nanoparticles, and the Schottky junctions between them. Furthermore, density functional theory calculations show that the strong affinity between Au 0 and the bromine atom adjacent to the oxygen atom in BDE-47 can lengthen the carbon–bromine bond and further weaken the bond upon the accumulation of electrons. This may be the main reason for the rapid debromination of BDE-47. This study provides a new perspective on the photocatalytic removal of moderately brominated polybrominated diphenyl ethers.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2024
·
IF 6.2
Yemian Zhou,Yun Liu,Tong Wang,Han Li,Jing He,An Xu
Disinfection by-products (DBPs) generated from water treatment have serious adverse effects on human health and natural ecosystems. However, research on the mutagenicity of DBPs with different chemical structures is still limited. In the present study, we compared the mutagenicity of 8 typical DBPs in human-hamster hybrid (A L ) cells and clarified the mechanisms involved. Our data displayed that the rank order for mutagenicity was as follows: iodoacetamide (IAcAm) > iodoacetonitrile (IAN) > iodoacetic acid (IAA) > bromoacetamide (BAcAm) ≈ bromoacetonitrile (BAN) > bromoacetic acid (BAA), which was confirmed by DNA double strand breaks and oxidative DNA damage. In contrast, bromoform (TBM) and iodoform (TIM) had minimal mutagenicity. The mutation spectrum analysis further revealed that IAN, IAcAm, and IAA could induce multilocus deletions in mammalian cells. Interestingly, nitrogenous DBPs (N-DBPs) and IAA were found to cause varying degrees of iron overload and lipid peroxidation, which was mediated by the activation of the Nrf2/HO-1 signaling pathway. Moreover, the presence of deferoxamine (DFO), an iron ion inhibitor, effectively reduced γ-H2AX and 8-OHdG induced by N-DBPs and IAA. These results indicated that the variations in genotoxicity among DBPs with different structures were associated with their ability to disrupt iron homeostasis. This study provided new insights into the mechanisms underlying the structure-dependent toxicity of DBPs and established a foundation for a more comprehensive understanding and intervention of the health risks associated with DBPs.
研究领域:
环境科学
·
毒理学
·
分子生物学
·
细胞生物学
✓ 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）