WATER RESEARCH
·
2017
·
IF 6.942
Xiaoxiang Cheng,Heng Liang,An Ding,Xuewu Zhu,Xiaobin Tang,Zhendong Gan,Jiajian Xing,Daoji Wu,Guibai Li
Coagulation and ozonation have been widely used as pretreatments for ultrafiltration (UF) membrane in drinking water treatment . While beneficial, coagulation or ozonation alone is unable to both efficiently control membrane fouling and product water quality in many cases. Thus, in this study an emerging alternative of ferrous iron/peroxymonosulfate (Fe(II)/PMS), which can act as both an oxidant and a coagulant was employed prior to UF for treatment of natural surface water, and compared with conventional coagulation and ozonation. The results showed that the Fe(II)/PMS-UF system exhibited the best performance for dissolved organic carbon removal, likely due to the dual functions of coagulation and oxidation in the single process. The fluorescent and UV-absorbing organic components were more susceptible to ozonation than Fe(II)/PMS treatment. Fe(II)/PMS and ozonation pretreatments significantly increased the removal efficiency of atrazine, p -chloronitrobenzene and sulfamethazine by 12–76% and 50–94%, respectively, whereas coagulation exerted a minor influence. The Fe(II)/PMS pretreatment also showed the best performance for the reduction of both reversible and irreversible membrane fouling, and the performance was hardly affected by membrane pore size and surface hydrophobicity . In addition, the characterization of hydraulic irreversible organic foulants confirmed its effectiveness. These results demonstrate the potential advantages of applying Fe(II)/PMS as a pretreatment for UF to simultaneously control membrane fouling and improve the permeate quality.
研究领域:
环境科学
·
水处理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2023
·
IF 8.7
Miao Yu,Rui Gao,Xinyuan Lv,Minghao Sui,Tian Li
Disinfection is widely applied in water and wastewater treatment to inactivate viruses. However, the inactivation mechanism associated with viral structural alteration during disinfection is still not clear. In this work, inactivation of bacteriophage phiX174 by ultraviolet radiation (UV 254 ) and free chlorine (FC), two most commonly used disinfection processes , was studied at the molecular level to investigate the relationship between phiX174 genome impairment and virus inactivation, and the correlation between protein impairment and function loss. Double-layer agar technique, quantitative real-time polymerase chain reaction (qPCR), real-time reverse transcription-polymerase chain reaction (RT-qPCR), and liquid chromatography-tandem mass spectrometry techniques (LC-MS/MS), together with structure impairment and function experiments were implemented to quantitatively analyze the inactivation and damage to genome and proteins of phiX174. Results showed that UV 254 and FC could effectively inactivate phiX174 at the practical doses (UV 254 dose of 30 mJ/cm 2 , and FC of 1–3 mg/L) used in water treatment plants , accompanied with the damage to viral genome and proteins. Specifically, a UV 254 irradiation dose of 9.6 mJ/cm 2 , and FC at an initial concentration of 1 mg/L at 4 min could lead to a 4-log 10 inactivation. Nevertheless, the combination of these two methods at selected doses played no significant synergistic disinfection effect. During UV 254 disinfection, the proportion of phiX174 with damaged genome was similar with that of the inactivated phiX174. In addition, UV 254 and FC could disrupt proteins of phiX174 such as H protein, thereby hindering the physiological function associated with these proteins. With these findings, it is suggested that UV 254 and FC disinfection could hinder the injection of the viral genome into host cells, thus resulting in the inactivation of phiX174. This work provides a comprehensive study of the inactivation mechanism of phiX174, which can enhance the applicability of UV 254 and FC in water treatment plants, and facilitate the design and optimization of disinfection technologies for virus control in drinking water and wastewater worldwide to ensure the biosafety .
研究领域:
环境科学
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微生物学
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水处理
·
病毒学
✓ 已验证
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 11
·9006-9015
·
IF 3.201
Huating Sun,Tianxing Wu,Yunxia Zhang,Dickon H. L. Ng,Guozhong Wang
Molybdenum disulfide (MoS2) was successfully synthesized via a facile one-step hydrothermal method without addition of templates or surfactants. The obtained MoS2 product was characterized via various techniques including FESEM, HRTEM, XRD, BET and XPS analyses. Their application in capturing Cr(VI) ions in water was investigated. The results showed that the MoS2 nanosheets were ultrathin with a thickness of 5–10 nm and had a uniform lateral size of 100–200 nm. Impressively, these MoS2 nanosheets not only possessed enlarged interlayer spacing, but also had multiple defects on the basal planes, which were proved to be crucial in the removal of Cr(VI). The kinetics of chromium adsorption was found to follow the pseudo-second-order rate equation and the adsorption isotherm data were well fitted to the Langmuir model with a chromium in-take capacity of about 84.03 mg g−1. This structure-enhanced removal was likely related to the synergism of adsorption and reduction, in which the anionic Cr(VI) was adsorbed on the surface of D-MoS2via electrostatic interaction. At the same time, some fraction of the adsorbed Cr(VI) was reduced to low toxic Cr(III) and the generated Cr(III) species were adsorbed by the adsorbent. More significantly, the adsorption and reduction processes not only transferred the Cr(VI) from the aqueous environment to the surface of solid adsorbents but also alleviated the toxicity of Cr(VI). It was evident that this study may promote the application of other transition metal dichalcogenides in environmental remediation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Water
·
2023
·Vol. 15
·期 20
·3667
·
IF 3.4
Junqing Xu,Meitian Pan,Cong Zou,Xueqiong Huang,Takeshi Hagio,Ryoichi Ichino,Long Kong,Liang Li
Heavy metal pollution poses an environmental risk, and its efficient removal and facile separation from water remains a challenge. Magnetic iron oxide, an eco-friendly, relatively stable, and easy-separation material, has been regarded as one of the most applicable adsorbents for water treatment. However, the limited adsorption capacity has restricted its applications. Herein, sulfur-doped magnetic Fe3O4(Sx–Fe3O4) adsorbent was fabricated using a calcination method for the efficient removal of Pb(II) from water. In contrast to undoped Fe3O4, the introduction of doped sulfur greatly enhanced the adsorption performance of S–Fe3O4over four times, with a maximum capacity of 333.33 mg g−1, which was synthesized at 300 °C with a raw molar ratio of S–Fe of 5. Based on the structure and morphology analysis, it was demonstrated that sulfur was successfully doped into the Fe3O4structures, which resulted in Fe3O4with active sulfur sites accordingly contributing to the adsorption enhancement through the combination of strong soft–soft interactions between soft base sulfur and soft acid Pb(II) along with surface adsorption. Sx–Fe3O4could maintain the adsorption performance in the presence of competing ions. Furthermore, although the sulfur doping process exhibited slight side effects on the magnetic property, magnetic Sx–Fe3O4maintained the high separation potential. This study presented a promising strategy to enhance the adsorption performance of Fe3O4through sulfur doping for Pb(II) removal from water.Keywords:adsorption;Pb;sulfur-doped Fe3O4;water treatment
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Advances
·
2022
·Vol. 3
·期 12
·4870-4877
·
IF 0
Xupeng Zhi,Xiaomin Li,Fangfei Dong,Yiwei Huang,Suliang Yang,Taihong Yan,Yinglin Shen
Traditional anion exchangers for TcO4− usually have low selectivity and adsorption capacity due to the lack of functional groups that interact strongly with TcO4−. Here, we report a three-dimensional imidazolium network IMI-P that exhibits high adsorption capacity, fast kinetics, and outstanding selectivity for ReO4−/TcO4− at pH 2–13. It can remove 90% of ReO4− in 30 s and 99% ReO4− in 10 min, which is significantly faster than most commercial materials. Besides, the maximum sorption capacity of IMI-P (792 mg ReO4−/g) is also higher than that of most commercial materials. IMI-P shows good TcO4− removal efficiencies for simulated wastewater, which can reach 91.5% and 98.4% at the solid–liquid ratio of 10 g L−1 and 50 g L−1, respectively. Compared with other Tc-adsorption polymers, IMI-P with a larger particle size (10–30 μm) is more suitable for column chromatography separation. Therefore, IMI-P has important application potential in wastewater treatment in the nuclear industry. The adsorption mechanism of IMI-P and the interaction mode with ReO4− were also studied by IR, EDS, and XPS.
研究领域:
化学
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环境科学
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材料科学
✓ 已验证
产品关联
DOI
Environmental Science-Water Research & Technology
·
2022
·Vol. 8
·期 11
·2796-2806
·
IF 5.819
Guohua Li,Xianjin Qi,Jiahao Shi,Guizhi Yan,Heng Wang,Aimin Zhang
Arsenic (As) pollution is a serious worldwide problem that requires urgent attention, as this heavy metal poses a serious threat to both human and environmental health. Here, Fe3O4 was used as an in situ Fe source removal agent to study the effect of pre-dissolution time on arsenic removal by Fe3O4. Fe3O4 is uniquely well suited for the treatment of industrial wastewater due to its structural characteristics. Assays were conducted at a Fe/As molar ratio of 3 : 1, and these components were pre-dissolved at 23 °C for 2 h to establish the optimal initial conditions for Fe-mediated arsenic removal at a high temperature. The adsorption capacity of arsenic in the pre-dissolution stage was 143.99 mg g−1. After adjusting the pH value to 2.5 and allowing the Fe and As to react at 90 °C for 24 h, 99.1% of the As was precipitated from the wastewater with an initial arsenic concentration of 8276.1 mg L−1. The leaching of this As-bearing precipitate was as low as 0.3 mg L−1. As a solid iron source, Fe3O4 provides a large number of nuclear sites for arsenic precipitation in the pre-dissolution stage and the high-temperature synthesis stage. At the same time, the supersaturation of the system was regulated by controlling the reaction and dissolution characteristics. Upon further characterization, the removal of As by Fe3O4 in the pre-dissolution process was attributed to a combination of physical adsorption and chemical precipitation.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 13
·8009-8018
·
IF 4.036
Ying Wu,Danying Xing,Linna Zhang,Hualiang Suo,Xiaodan Zhao
Transition metal ion-activated sulfite autoxidation processes for the production of sulfate radicals (SO4˙−) have been widely investigated to achieve efficient abatement of recalcitrant organic pollutants. However, these homogeneous processes suffered from narrow effective pH range and metal release, thus restricting their practical application. In order to address this problem, we report a simple and efficient approach to iohexol abatement by a combined Cu2S and sulfite process (simplified as Cu2S/sulfite process) based on the superior activation performance of copper and the excellent electron donating capacity of the low-valent sulfur species. Compared with typical copper oxides, Cu2S can significantly accelerate the sulfite autoxidation to generate radicals, leading to 100% iohexol abatement in the Cu2S/sulfite process. The influence of solution pH and dissolved oxygen on iohexol abatement is also investigated. Qualitative and quantitative analysis of reactive radicals is performed by electron paramagnetic resonance (EPR) and radical quenching experiments. Generation of SO4˙− from sulfite activation with Cu2S mainly contributes to the iohexol abatement. X-ray photoelectron spectroscopy (XPS) suggests that copper is the main activation site and the reductive sulfur species can achieve the continuous regeneration of copper. Application potential of the Cu2S/sulfite process is also assessed. This study provides a new method for the treatment of water and wastewater containing organic micropollutants.
研究领域:
环境科学
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化学工程
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Jinfeng Zhao,Yuntong Fan,Jiaqi Zhangle,Congcong Ni
Perfluorooctanoic acid (PFOA) is a persistent organic pollutant found in various industrial effluents, posing significant environmental and health risks. Electrosorption of PFOA on MXene-polyaniline film from water was studied. The results of electrosorption kinetics showed that the functionalized MXene film with polyaniline resulting in an approximately 100 % increase in electrosorption capacitance for PFOA due to increasing of the MXene film's volumetric capacitance and modifying of surface chemistry of MXene. The maximum adsorption of PFOA on MXene and MXene-polyaniline films were 358.5 mg/g and 966.1 mg/g, respectively, at an initial concentration of 100 mg/L upon application of +1.0 V. Moreover, humic acid (HA) competing with the adsorption sites, sodium chloride through the double-layer compression effect, and pH affecting the amine or amide functional groups on MXene-polyaniline which inhibited PFOA adsorption onto MXene-polyaniline film were thoroughly examined. Lastly, the reversible adsorption–desorption cycles show that the MXene–polyaniline film possesses the potential to be used continuously. To address PFAS pollution in water sources, we think our approach can help build effective and long-lasting technology.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2024
·Vol. 89
·期 4
·873-886
·
IF 2.5
Tao Haiyan,Cao Xiaochang,Song Rujie,Zhou Zebin,Cheng Fang
A membrane-aerated biofilm reactor (MABR) combines membrane technology with biofilm processes and has unique advantages in the treatment of organic wastewater and volatile wastewater. The common membranes for MABR systems usually have relatively uneven pore structures and low bubble point pressure, resulting in unsatisfactory O 2 utilization and wastewater treatment efficiency. In this work, polydimethylsiloxane (PDMS) and UiO-66 (a Zr-based metal organic framework) were coated on the surface of a commercial polypropylene (PP) hollow fiber membrane to prepare oxygen-rich MABR membranes and modules, which showed an attractive O 2 utilization rate and wastewater treatment efficiency. The bubble points of the PDMS and PDMS-UiO-66 membranes were significantly higher than those of the PP membranes, and the PDMS-UiO-66 membranes had better oxygen enrichment capacity and biological affinity. The optimal PDMS-UiO-66 membrane modules had an O 2 permeance of 31.65 GPU (1 GPU = 3.35 × 10 −10 mol m −2 s −1 Pa −1 ), with O 2 /N 2 selectivity of 2.21. The membrane hanging effect and processing capacity for domestic sewage were greatly improved. This study may provide insights and guidelines to fabricate porous mixed matrix membranes and modules in the industry for MABR. The developed products are expected to be applied in the actual separation process. PDMS and PDMS-UiO-66 were coated on the PP support to prepare O 2 -rich MABR membranes and modules. With UiO-66 loading, the module has a higher O 2 /N 2 separation performance, a rougher and more hydrophilic membrane surface. The PDMS-UiO-66 membrane module exhibits a good biofilm hanging effect and high NH 4 + -N removal performance.
研究领域:
环境科学
·
材料科学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 32
·期 1
·015706
·
IF 3.551
Qiao Yin,Zhenzhen Cao,Zhiyuan Wang,Jiaming Zhai,Mingliang Li,Li Guan,Bingbing Fan,Wen Liu,Gang Shao,Hongliang Xu,Hailong Wang,Rui Zhang,Hongxia Lu
Photocatalytic degradation of pollutants has been proved to be an effective strategy for wastewater treatment. Herein, TiO2 nanoparticles were synthesized on a Ti3C2 matrix by in situ growth, forming Z-scheme TiO2@Ti3C2/Cd0.5Zn0.5S (TO/CZS) multilevel structured nanocomposites via one-step hydrothermal route. The effects of hydrothermal temperature and Cd0.5Zn0.5S content on microstructure and properties of composites were assessed. TO/CZS nanocomposites were probed into phase composition, morphological and optical properties with x-ray diffractometer, infrared radiation, scanning electron microscope and UV–vis reflective spectra. Following the hydrothermal reaction at 160 °C for 12 h, TiO2 nanoparticles of 30 nm in diameter were generated in situ on Ti3C2 lamina and Cd0.5Zn0.5S particles were evenly distributed on the Ti3C2 matrix. The photocatalytic activity of TO/CZS composites were evaluated, which found that degradation rate constant (k = 0.028 min−1) of TO/CZS-40 on Rhodamine B was 5.19 times that of pure TiO2 and 4.48 times that of Cd0.5Zn0.5S. Through anchoring Ti3C2 as an electron transition mediator and combination with TiO2 and Cd0.5Zn0.5S, the new Z-scheme between TiO2 oxidized by Ti3C2 and Cd0.5Zn0.5S establishes a multilevel structure of separating electron-hole pairs. This work demonstrates a valid way to control electrons and hole transfer directions efficiently through designing multilevel semiconductor structural designs.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Ning Li,Yu Tian,Jianhui Zhao,Wei Zhan,Jinying Du,Lingchao Kong,Jun Zhang,Wei Zuo
Efficient and selective capture of phosphate from wastewater is critical to inhibit water eutrophication and supplement phosphate sources. Adsorption, as a simple and environmental-friendly approach, can realize phosphate recovery from wastewater. In order to enhance capture efficiency, adsorption capacity and reusability, magnetic 3D Fe 3 O 4 @ZnO nanocubes with uniform active sites were tailor-designed by hydrothermal-atomic layer deposition method for phosphate removal from water under weak magnetic field (WMF). Ultrafast capture of phosphate (94.8% in 5 min) was achieved by Fe 3 O 4 @ZnO composite under WMF due to the improvement of surface area and electrostatic interaction. More importantly, the synergistic effect of Lorentz force and electrostatic attraction promoted the transfer of phosphate anions to Fe 3 O 4 @ZnO surface and pores in one step, breaking the adsorption limitation induced by intraparticle diffusion. Isotherms fitting indicated that multilayer adsorption occurred on Fe 3 O 4 @ZnO surface with superior adsorption capacity of 100.3 mg/g. Moreover, the Fe 3 O 4 @ZnO exhibited excellent selectivity competing with co-existing matters in wastewater. Mechanism exploration found that inner-sphere complexation by ligand-exchange played a major role in the adsorption process. This easily separable and recyclable adsorbent was demonstrated to be a promising candidate for efficient phosphate capture in real sewage. Also, this study provided a novel approach with WMF application in magnetic separable adsorption system for contaminants remediation.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Zinashbizu Mengesha Ayalew,Xiangyuan Zhang,Xuejun Guo,Sana Ullah,Siwen Leng,Xiaoyan Luo,Na Ma
Traditional chemical precipitation generates a large volume of sludge required by further hazardous waste disposal. For reducing this drawback, four oligo-ethyleneamine dithiocarbamates (OEDTC), including ethylenediamine-dithiocarbamate (E 1 -DTC), diethylenetriamine-dithiocarbamate (E 2 -DTC), triethylenetetramine-dithiocarbamate (E 3 -DTC) and tetraethylenepentamine-dithiocarbamate (E 4 -DTC) were synthesized to remove Cu, Ni and Zn directly from acidic wastewater. Based on S dose, which was an essential element for metal removal, the treatment effectiveness order of the four OEDTC for Cu and Ni was E 1 -DTC > E 2 -DTC > E 4 -DTC > E 3 -DTC. The theoretical molar ratios of S toward Cu, Ni and Zn for the completed metal removal from single component were 1.5:1, 2:1, 2.2:1 for E 1 -DTC; 2:1, 2.6:1, 2.9:1 for E 2 -DTC; 2:2, 3:1, 3.9:1 for E 3 -DTC; and 2:1, 2.7:1, 2.8 for E 4 -DTC, respectively. The four OEDTC had marked preference for Cu over Ni and Zn from multiple components of simulated wastewater. They showed high removal efficiency for the complex-formed Ni and Zn from actual electroplating wastewater, yielding the effluent residual 0.003–0.008 and 0.021–0.046 mg/L, respectively. When the four OEDTC were precipitated with the three metals, FT-IR suggested the coordination of metals with S and SEM indicated densely packed particle formation. The yielded OEDTC-metals sludge enriched with heavy metals exhibited potential to be recycled.
研究领域:
环境科学
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化学工程
✓ 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）