APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Tao Zhou,Xiaoli Zou,Juan Mao,Xiaohui Wu
Effective decomposition of antibiotic sulfadiazine (SD) in a Fe 0 -catalyzed sonochemical Fenton like system (Sono-FL) was demonstrated. By using the response surface methodology (RSM), an optimized experimental condition of pH 7.00, 0.94 mM Fe 0 , 1.90 mM persulfate (PS) and 20 W ultrasound (US) power was concluded, which could reach the predicted SD degradation efficiency of 90%. Afterwards, effects of wastewater matrix (five inorganic anions and two chelating agents) on the SD degradation were investigated in the system, respectively. It was found that the SD degradation could be inhibited by SO 4 2− , NO 3 − , HCO 3 − /CO 3 2− and H 2 PO 4 − to different extents. Cl − would lead to an enhancement with a low dosage (5 mM), but an inhibition with a high dosage (100 mM). Unexpectedly, chlorinated organic intermediates were also found as SD decomposed. Appropriate dosages of oxalic acid (OxA) or EDTA could benefit the SD degradation in the Sono-FL system, while excessive chelating agents would play as competitive pollutants. It was summarized that inorganic anions would mainly react with SO 4 − and/or OH to form sub-radicals of less oxidative potential. OxA and EDTA would not only participate in complexing dissolution of Fe 0 but also provide additional oxidants such as H 2 O 2 and [Fe IV O] 2+ , through the electron transfer reactions caused by the iron-ligands species.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2022
·Vol. 86
·期 11
·2963-2973
·
IF 2.43
Li Ting,Zuo XiaoJun,Zhang SongHu,Kong QingGang
Recently, increasing attention has been paid to antibiotic resistance in stormwater runoff. However, there is no available literature about the control of antibiotic resistant bacteria (ARB) through 365 nm ultraviolet light-emitting diode (UVA/LED). In this study, batch experiments were conducted to investigate ARB inactivation kinetics, effects of light intensity and water matrix (including suspended solid (SS) concentration, initial pH and bacteria concentration), and potential transmission risks after UVA/LED irradiation. Results showed that ARB inactivation efficiencies reached 6.31 log reduction at 8 mW/cm 2 (86 J/cm 2 ) of UVA/LED for 180 min. ARB inactivation efficiencies increased with the increase of light intensity, and showed a linear relationship. ARB inactivation decreased with increasing SS levels, and the largest inactivation efficiencies was 3.56 log reduction at 50 mg/L of SS. Initial pH had slight effect on ARB inactivation through UVA/LED irradiation. A low initial bacteria concentration (10 5 CFU/mL) was not necessarily associated with good ARB inactivation (3.59 log reduction). After UVA/LED irradiation, ARB was hardly detected during 12 hr of dark repair, and the transfer frequency of kanamycin resistance gene was increased to 5.43 × 10 −4 . These suggested that the application of UVA/LED to inactivate ARB in stormwater runoff was feasible and desirable in this study. ARB inactivation reached 6.31 log reduction at 8 mW/cm 2 of UVA/LED for 180 min. UVA/LED inactivation kinetics could be well described by the first-order model. Initial pH and bacteria levels had weak effects for ARB inactivation. Potential risks of ARB could be blocked after 60 min of UVA/LED disinfection.
研究领域:
环境科学
·
微生物学
·
公共卫生
·
水利工程
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Kai-Ge Lu,Mengya Li,Haiou Huang
Reverse osmosis (RO) membranes were preconditioned in this study with humic acid , sodium alginate , or bovine serum albumin, and subsequently examined for silica scaling using the water matrix representative of concentrated brackish groundwater. The results suggested that water matrix combined with organic foulants affected silica scaling. High ambient pH favored the moderate silica ionization and thus the silica homogeneous polymerization to potentially form low molecular weight silica oligomers . The resulting scaling layer was dense and highly impermeable. Under the high Ca proportion at a given hardness, membrane scaling was enhanced through the Ca-induced silica scaling and the formation of intermolecular bridges between adjacent silica species. In contrast, high Mg hardness may facilitate the sustainable growth of silica oligomers to form the ringed high molecular weight oligomers by reducing the required energy for chain deformation. The deposition of these oligomers caused a loose scaling layer with reduced hydraulic resistance to water permeation. During the scaling tests under similar water matrix, the membranes slightly fouled by organics suffered severe flux decline due to an available space provided by the pre-existing organic fouling layer for subsequent silica scaling.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Ai Zhang,Yuye Shen,Xueyan Yin,Andere Clement Miruka,Yuyi Gu,Yanan Liu
The fate of glucocorticoids (GCs) in environment has been an increasing concern. In this study, performance of calcium peroxide (CaO 2 ) in removing GCs was investigated using clobetasol propionate (CP) as the representative compound. Critical treatment parameters (including CaO 2 dosage, initial pH, reaction time, and initial CP concentration) were optimized for CP removal by Response surface methodology (RSM) with a four-level Box-Behnken factorial design. A coefficient of determination (R 2 ) value (0.97), model F-value (32.18) and its low p-value (F < 0.0001) along with lower value of coefficient of variation (9.35%) indicated the fitness of the model. The results showed that CaO 2 treatment was effective in CP removal due to its coupled effects of oxidation and adsorption during CaO 2 treatment. At optimum CaO 2 dosage (3.43 g L –1 ), initial pH (7), reaction time (17.34 min), and initial CP concentration (0.03 mM), the model predicted 95.0% CP removal against the experimental value of 94.2 % CP removal. Water matrixes influenced CP removal during CaO 2 treatment in which HCO 3 – ions played an inhibitory role. The highest removal efficiency was obtained in underground water, followed by in secondary effluent, in tap water, and in surface water.
研究领域:
环境科学
·
药物代谢
·
分析化学
·
污染控制技术
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DOI
高影响因子
WATER RESEARCH
·
2023
·
IF 12.8
Jiakai Qiu,Jing Wang,Mingzhu Ren,Xin Yang,Jianbo Zhang,Xiaolong Zhang,Hongbin Cao,Yongbing Xie
Chloride ion (Cl − ) is one of the most common anions in wastewater and saline wastewater, but its elusive effects on organics degradation are not clear yet in many cases. In this paper, the effect of Cl − on organic compounds degradation is intensively studied in catalytic ozonation of different water matrix. It was found that the effect of Cl − is almost completely reflected by transforming ·OH to reactive chlorine species (RCS), which is simultaneously competitive with organics degradation. The competition between organics and Cl − for ·OH directly determines the ratio of their consumption rate of ·OH, which depends on their concentration and reactivity with ·OH. Especially, the concentration of organics and solution pH may change greatly during organics degradation process, which will correspondingly influence the transformation rate of ·OH to RCS. Therefore, the effect of Cl − on organics degradation is not immutable, and may dynamically change. As the reaction product between Cl − and ·OH, RCS was also expected to affect the degradation of organics. But we found that Cl· had no significant contribution to the degradation of organics in catalytic ozonation, which may due to its reaction with ozone. Catalytic ozonation of a series of benzoic acid (BA) with different substituents in chloride contained wastewater was also investigated, and the results showed that the electron-donating substituents can weaken the inhibition of Cl − on BAs degradation, because they increase the reactivity of organics with ·OH, O 3 and RCS.
研究领域:
环境科学
·
废水处理
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产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Izaz Ali Shah,Sharafat Ali,Zhe Yang,Ihsanullah Ihsanullah,Haiou Huang
Thin-film composite (TFC) nanofiltration (NF) and reverse osmosis (RO) membranes have been widely used to remove pharmaceutically active compounds (PhACs) from water and wastewater. However, limited information is available to present the rejection of neutral PhACs under complex water matrices. In this study, we used acetaminophen (AAP) as a representative neutral pollutant to study the effects of feedwater matrices on the rejection of neutral PhACs by NF and RO membranes. The results showed that the permeation of solutes and water through NF and RO membranes followed the classical solution-diffusion model. The corresponding permeability coefficients of AAP for the RO membrane showed good consistency, with average values ranging between (6.19–7.56) × 10 −6 μm s −1 in fresh and brackish feedwater. Meanwhile, the NF membrane exhibited stable AAP and NaCl fluxes as the applied pressure increased from 4.8 to 7.6 bar, suggesting an insignificant influence of convection on solute transport . In addition, a 10-fold increase in NaCl concentration reduced the average AAP permeability coefficient of the NF membrane by 57% (i.e. from 2.8 × 10 −5 m s −1 to 1.2 × 10 −5 m s −1 ), highlighting the relevance of co-existing ions to AAP transport. Furthermore, organic fouling resulted in enhanced AAP rejection by both NF and RO membranes at neutral pH level and medium applied pressure (i.e. 5.8 bar). Overall, this study provided important insights into the separation mechanism of TFC membranes for neutral PhACs, as well as the complex effects of the water matrix on the solute permeation processes.
研究领域:
环境科学
·
膜技术
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Jingdong Yang,Yu Li,Zequn Yang,Kaimin Shih,Guang-Guo Ying,Yong Feng
The presence of 1,4-dioxane in various water streams poses a threat to the health of human beings. In this study, the oxidative combination of ozone with peroxymonosulfate (PMS) was for the first time used to remove 1,4-dioxane from water. Near complete abatement of 1,4-dioxane was achieved by ozone-PMS after reaction of only 15 min and the degradation kinetics was found to be positively correlated with doses of PMS and ozone. Ozone-PMS oxidation had the optimum performance at slight base pH values. Both sulfate radicals and hydroxyl radicals were generated in ozone-PMS oxidation and these radicals resulted in the degradation of 1,4-dioxane. The effects of common water constituents and real water matrices were investigated. It was found that bicarbonate ions with a concentration up to 10 mM had a slight promoting effect, while either chloride ions or natural organic matter inhibited only slightly the degradation. Meanwhile, no obvious difference in the degradation of 1,4-dioxane was found among the real water matrices and deionized water , which demonstrates that ozone-PMS oxidation has high tolerance and stability. The results from this study demonstrate that ozone-PMS may be a promising technology for the removal of 1,4-dioxane from various water matrices.
研究领域:
环境科学
·
水处理技术
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产品关联
DOI
PubMed
高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 8
·2279-2295
·
IF 2.936
Chen Lisha,Wang Yuqing,Dong Shanshan,Chen Suhua,Luo Shenglian
We prepared in-plane heterostructural photocatalysts of enhanced photocatalytic performance by coplanar grafting nitrogen-doped carbon plane (NDCP) to graphitic carbon nitride (g-C 3 N 4 ) network. The optimal heterostructural photocatalyst with efficient in-plane built-in electric field achieved 1472.5 μmol g −1 h −1 hydrogen evolution rate, 97.0% removal of Rhodamine B and 91.9% removal of sulfamethoxazole under visible light irradiation. The high photodegradation performance was maintained in water matrices. Graphical abstract
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2018
·Vol. 2017
·期 2
·340-350
·
IF 1.247
Ma Jie,Li Haiyan,Yang Yongqi,Li Xuening
The present study explored the influence of Cl − , Br − , CO 3 2− , HCO 3 − , PO 4 3− , HPO 4 2− , NO 3 − , SO 3 2− and natural organic matter (NOM) on the reaction kinetics and the formation of undesired degradation byproducts during phenol oxidation by heat-activated persulfate (PS). CO 3 2− and PO 4 3− promoted the phenol degradation, because the hydrolysis of CO 3 2− and PO 4 3− created basic pH conditions which were conducive to enhanced PS oxidation rate. Br − promoted the reaction by reacting with sulfate radicals (SO 4 •− ) to produce bromine radicals that can selectively react with electron-rich phenol. NOM scavenged reactive SO 4 •− , thus inhibiting the reaction. As a strong reducing agent, SO 3 2− rapidly reduced PS, thus completely suppressing the reaction. HCO 3 − , HPO 4 2− , Cl − , and NO 3 − had negligible impact on PS oxidation of phenol. Six intermediates were detected in the no anion control using gas chromatography–mass spectrometry (GC-MS). Various toxic halogenated phenols and halogenated hydroquinones were detected in the treatment containing Cl − and Br − . In contrast, in the treatment containing CO 3 2− , HCO 3 − , PO 4 3− , HPO 4 2− , and NO 3 − , no new intermediates were identified except for the intermediates already detected in the control treatment. Based on intermediates identified, reaction pathways for PS oxidation of phenol without anions and in the presence of halides were proposed respectively.
研究领域:
环境化学
·
水处理技术
·
高级氧化过程
·
污染物降解
·
反应机理
·
环境毒理学
✓ 已验证
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2019
·Vol. 30
·期 9
·1920-1931
·
IF 3.25
Ting Wang,Bing–rui Li,Li–guang Wu,Yu–bing Yin,Bo–qiong Jiang,Ju–qing Lou
La 3+ - or Yb 3+ -doped TiO 2 supported on the surface of reduced graphene oxide were fabricated by adsorbed-layer nanoreactor synthesis (ANS) coupling with a solvothermal treatment to extend photocatalysis application in the advanced treatment of simulated wastewater with high salt concentration. Results showed that La 3+ or Yb 3+ could distribute in the TiO 2 lattice, only in ANS preparation with graphene oxide as the carrier, to replace Ti 4+ during the solvothermal treatment, thus introducing TiO 2 mixed-crystal and heterojunction structures in the catalysts. La 3+ or Yb 3+ caused lattice distortion structures and anionic vacancies in the TiO 2 lattice. The anionic vacancies (oxygen vacancies) might generate Ti 3+ in catalysts, thus enhancing visible-light response, due to impurity levels introduced by La 3+ or Yb 3+ . As the strong adsorption capability of the catalyst for phenol was not interfered by salt ions in the simulated wastewater, the catalysts could efficiently degrade phenol. The highest removal rate of phenol was approximately 90%.
研究领域:
环境科学
·
材料化学
·
光催化
·
水处理
·
纳米材料
·
表面化学
·
环境功能材料
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2022
·
IF 13.4
Yi Liu,Wenhua Dong,Shuyi Shen,Fanxu Meng,Jiajia Wang,Kun Yang,Daohui Lin
Cost-effective disinfection technology is urgently needed in poor rural areas. Erythrosine (ERY)-based solar disinfection (SODIS) provides a promising solution because of its effective inactivation of viruses and gram-positive bacteria at low cost. However, the poor gram-negative bacteria (G − , e.g., Escherichia coli ) inactivation of photosensitized ERY inhibits its application. Herein, for the first time, the protonation of ERY was found to greatly enhance its G − inactivation, and 99.99999% (7.0 log) of E. coli were completely inactivated within only 30 s using 2.5 mg/L ERY under 200 mW/cm 2 visible light irradiation. The inactivation rate constant ( k ) reached 17.5 min −1 at pH 4.0, which was 4730 times higher than that at pH 7.0. At a lower pH, more severe cell wall and genomic DNA damage was observed. A linear correlation between k and monoanionic ERY (HE − ) content was obtained, indicating that HE − rather than dianionic ERY (E 2− ) participated in the inactivation at pH 5.0–7.0, which was further explained by the higher production of reactive oxygen species and bacterial adsorption of HE − than E 2− . Both 1 O 2 and O 2 − • dominated bacterial inactivation, contributing 56.8% and 43.2%, respectively. O 2 − • but not 1 O 2 caused ERY photobleaching. OH • was not involved in either inactivation or photobleaching. Humic acid and salts (NaCl, Na 2 SO 4 , CaCl 2 , and MgCl 2 ) slightly inhibited inactivation, while NaHCO 3 accelerated inactivation. Complete inactivation (99.9999%) of E. coli was achieved within ∼30 min at pH 5.0 in ERY-based SODIS with good adaptation to various water matrices and weather (sunny or partly cloudy). This work will help to promote the application of ERY-based disinfection especially for SODIS in poor rural areas.
研究领域:
环境科学
·
水处理
·
微生物学
·
光化学
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产品关联
DOI
PubMed
高影响因子
Surfaces and Interfaces
·
2023
·
IF 6.2
Yue Shen,Haoyang Xu,Yage Zheng,Yao Wang,Liang Zhang,Zhiqiang Zhang,Lvling Zhong,Zhixian He
The development of a low-cost and recyclable method for wastewater treatment has been a major challenge. Polyvinylidene fluoride (PVDF) membranes have received considerable attention owing to their excellent mechanical strength , unique antioxidant properties, and low cost. In this study, Bi/BiOCOOH/PVDF composite membrane materials were prepared using a simple two-step solvent thermal method and phase conversion method. The results showed that under the synergistic action of adsorption and photocatalysis , the photocatalytic degradation efficiency of Bi/BiOCOOH composite material and Bi/BiOCOOH/PVDF composite membrane material for ciprofloxacin (CIP) was much higher than that of BiOCOOH. The introduction of PVDF acted as a carrier, improved the adsorption of the catalytic material to CIP, and facilitated the effective collision of the photocatalytic active site and CIP. The experimental results and theoretical calculations confirmed that the combination of Bi and BiOCOOH effectively improved the light absorption capacity and photocatalytic performance. The reproducibility test revealed that the small amount of new composite catalyst for Bi/BiOCOOH/PVDF as a carrier was lost and that the Bi/BiOCOOH/PVDF catalyst still had high catalytic activity. In addition, the influence of water matrix factors, such as pH and anion, on the photocatalytic degradation experiment was investigated, which would provide some reference for the actual wastewater treatment of the composite catalyst. This study demonstrates a photocatalytic activation mechanism between metals and semiconductors and provides some basis for constructing catalysts for the synergistic and effective treatment of water pollution through a combined adsorption and photocatalysis process.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）