SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Chengsi Hou,Shuai Peng,Zhengwei Zhou,Longqian Xu,Yue Wang,Jianfeng Zhu,Pan Zhang,Zuofeng Chen,Zhendong Lei,Deli Wu
Flow Electrode Capacitance Deionization (FCDI) has been frequently used for NH 4 + recovery from wastewater as a low-energy, high-efficiency electrochemical technique. However, issues such as high cost (mainly due to the use of ion-exchange membranes) and weak selectivity have limited the expansion of their applications. In this study, SDS-AC was prepared and applied in microfiltration membrane FCDI (MFFCDI) to recover ammonia (NH 4 + ). The material characterization results showed that the surfactant was stably loaded on the AC surface, and the adsorption capacity of modified AC for NH 4 + was greatly enhanced. During the recovery process, NH 4 + migrated to the electrode chamber and immobilized on the SDS-AC, while Na + migrated to the electrode chamber and then released to the desalination chamber due to co-ion repulsion. Based on this principle, selective recovery of NH 4 + was achieved (selectivity = 3.51). At the end of the recovery, more than 70 % of the NH 4 + was immobilized on the SDS-AC and the NH 4 + could be desorbed with NaOH. The results of the recycling experiments showed good stability of the SDS-AC-based MFFCDI system, and the recovery of food waste fermentation liquor demonstrated that the system could realize the selective recovery of NH 4 + from complex feed water. In summary, the SDS-AC-based MFFCDI technology has great potential for the application of NH 4 + recovery from wastewater. Although the scale of this study was limited to the laboratory stage, it still shows potential for application in engineering. In the future, larger scale applications in engineering will be carried out and the environmental and economic benefits of the technology will be assessed through a full life cycle analysis.
研究领域:
环境科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 3
·期 6
·2650-2657
·
IF 0
Zhen-Xing Wang,Cher-Hon Lau,Nai-Qing Zhang,Yong-Ping Bai,Lu Shao
Novel hybrid coatings with excellent wettability are architecturally constructed on the surfaces of different types of separation membranes via simultaneous polymerization of mussel-inspired dopamine and hydrolysis of commercially available and low-cost silane through a highly efficient one-step approach. After coating with the designed hybrid coatings, the ultrafiltration (UF) membranes possess high hydrophilicity and excellent dry storage ability while the microfiltration (MF) membranes are endorsed with superhydrophilicity and underwater superoleophobicity. Such unique UF and MF membranes can be deployed for treating protein-rich water with drastically enhanced functions and separating oily water (oil-in-water emulsion) under atmospheric conditions with ultrahigh water flux and superior antifouling abilities. This versatile strategy to tailor membrane surface wettability paves the way for separation membranes to be used in harsh water environmental remediation and greatly stimulates the rapid development of mussel-inspired pDA based hybrid materials for advanced applications.
研究领域:
材料科学
·
环境科学
·
生物仿生学
✓ 已验证
DOI
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-10
·
IF 4.259
Yu Bing,Song Qianqian,Cong Hailin,Xu Xiaodan,Han Dongwei,Geng Zhongmin,Zhang Xiaoyan,Usman Muhammad
In this paper, a thermo- and pH-responsive microfiltration membrane was prepared based on three-dimensional (3D) inverse colloidal crystals (ICC). To manufacture the smart ICC membrane, the typical thermo-responsive N-isopropylacrylamide (NIPAM) and pH-responsive methacrylic acid (MAA) were polymerized inside silica colloidal crystals. The smart ICC membranes were characterized by SEM, IR and contact angle measurements. Moreover, the permeability of smart microfiltration membrane was carried out by the KCl diffusion tests. The result showed that effective diameter of the polymer ICC membrane can be reversible tuned by temperature and pH. Besides, the functional ICC membrane showed outstanding temperature- and pH-responsive gating property, which was applied to separate particles of different sizes. The savvy environment-responsive gating membranes have potential uses in filtration, separation, purification, sensor and other applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Haiqing Chang,Yingyuan Zhu,Naiming Liu,Pengwei Ji,Zhongsen Yan,Xiaoxiang Cheng,Dan Qu,Heng Liang,Fangshu Qu
Low pressure membrane takes a great role in hydraulic fracturing wastewater (HFW), while membrane fouling is a critical issue for the stable operation of microfiltration (MF). This study focused on fouling mitigation by sodium percarbonate (SPC) oxidation, activated by ultraviolet (UV) and ferrous ion (Fe(II)). The higher the concentration of oxidizer, the better the anti-fouling performance of MF membrane. Unlike severe MF fouling without oxidation (17.26 L/(m 2 ·h)), UV/SPC and Fe(II)/SPC under optimized dosage improved the final flux to 740 and 1553 L/(m 2 ·h), respectively, and the latter generated Fe(III) which acted as a coagulant. Fe(II)/SPC oxidation enabled a shift in fouling mechanism from complete blocking to cake filtration, while UV/SPC oxidation changed it to standard blockage. UV/SPC oxidation was stronger than Fe(II)/SPC oxidation in removing UV 254 and fluorescent organics for higher oxidizing capacity, but the opposite was noted for DOC removal. The deposited foulants on membrane surface after oxidation decreased by at least 88% compared to untreated HFW. Correlation analysis showed that UV 254, DOC and organic fraction were key parameters responsible for membrane fouling (correlation coefficient＞0.80), oxidizing capacity and turbidity after oxidation were also important parameters. These results provide new insights for fouling control during the HFW treatment.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 89
·48317-48321
·
IF 3.708
Yun Yu,Weimin Hou,Xuebing Hu,Yang Yu,Le Mi,Lixin Song
A novel superhydrophobic Al2O3 microfiltration membrane was prepared by the layer-by-layer assembly of TiO2 coating with subsequent fluorination grafting surface treatment by 1H,1H,2H,2H-perfluorodecyltriethoxysilane. The influence of surface morphology on membrane superhydrophobicity, pore size diameter distributions and pure water permeability of the different membranes were studied. By optimizing the grafting parameters, a needle-like surface of grafted TiO2-coated Al2O3 membrane with a water contact angle of 169.5° was obtained. The pure water permeability of different membranes varied from 100 l m−2 h−1 bar−1 before grafting to 3–5 l m−2 h−1 bar−1 after grafting, and the grafted superhydrophobic membrane showed excellent water repellence. The novel superhydrophobic membrane is shown to be promising for liquid–liquid and gas–liquid separation.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 6
·2906-2914
·
IF 2.936
Xiaoqin Yin,Kang Guan,Peng Gao,Cheng Peng,Jianqing Wu
A method called the precursor film firing method is proposed to improve the permeance of ceramic microfiltration membranes by avoiding intermediate layer and dip-coating process, and efficiently control the thickness of the separation layer. In this method a precursor film is prepared independently of the support by a film coating machine. This precursor film consists of two layers: Al2O3/PVA layer made of Al2O3 powder and polyvinyl alcohol (PVA), and polyvinyl butyral (PVB) layer. The precursor film is pasted on the support and fired to obtain membranes. Because the intermediate layer and dip-coating process are avoided in this method, the fabricated membranes show high permeance. For the fabricated membrane with average pore size = 0.18 μm and separation layer thickness = 10.7 μm, the permeance is 3890 L m−2 h−1 bar−1. Also the separation layer thickness can be controlled efficiently. And the precursor film can be used on fabricate curved membranes such as cylindrical membranes.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2016
·
IF 5.557
Ming-Bang Wu,Yan Lv,Hao-Cheng Yang,Li-Fen Liu,Xi Zhang,Zhi-Kang Xu
In this work, we report a novel thin film composite (TFC) nanofiltration membrane (NFM) by incorporating a thin hydrophilic multi-walled carbon nanotubes (MWCNTs) interlayer between the microfiltration membrane support and the dense skin layer from interfacial polymerization. The MWCNT interlayer can absorb and storage the aqueous amino solution to facilitate the following interfacial polymerization, as well as provide a robust mechanical support to enable the nanofiltration of thin skin layer on the microporous substrate. Compared to those TFC NFMs supported by the ultrafiltration membranes, our membranes exhibit increased water permeation flux as high as 105.4 L m −2 h −1 at 0.6 MPa (which doubles the flux of the conventional ones) with high rejection for Na 2 SO 4 (~95%). Moreover, the TFC NFMs show good stability during a long-term nanofiltration operation. This research provides us a promising approach to fabricate the high-flux NFMs for low pressure operation.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Juanjuan Zhou,Yan Xia,Yanyan Gong,Wanbin Li,Zhanjun Li
Excess natural organic matter (NOM) in water not only lead to unpleasant black color and dissolved oxygen depletion in wastewater and natural water body but also causes carcinogenic chlorinated organic byproduct during drinking water chlorine disinfection. We try to develop a novel cost-effective and green technology for water NOM removal. In our simulated NOM removal process using humic acid (HA) as typical organic matter, we find that mesoporous nano-MgO performs an abnormally high NOM removal capacity (1260 mg-HA/g-MgO, or 446 mgC/g-MgO) when coupled with microfiltration membrane separation, which can’t be illustrated by traditional adsorption mechanism. Actually, Mg 2+ from dissolved Mg(OH) 2 contributes ∼ 92% NOM removal via coagulation while Mg(OH) 2 is responsible for the residue ∼ 8% via adsorption. MgO serves as a two-in-one coagulant and adsorbent. The MgO treatment process is highly pH sensitive and weak acidic condition is favored for high NOM removal efficiency. MgO can be regenerated for more than 10 circulations by annealing Mg(OH) 2 /Mg-NOM composite at 500 °C, so that our MgO recycling process will be sustainable without the need of continuous chemical purchase. More importantly, no solid waste is generated in this novel process. This MgO-recycling NOM-removal process is simple, efficient, and sustainable for water NOM removal and will be significant in promoting novel sustainable technologies for NOM- or HA-related water remediation and treatment while minimizing the generation of solid waste.
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 MEMBRANE SCIENCE
·
2019
·
IF 7.015
Jingyi Yang,Feiyun Sun,Lingyan Zhao,Ding Yu Xing,Wenyi Dong,Zijun Dong
Electric membrane bioreactor (E-MBR) for wastewater treatment and water purification has attracted significant interest due to its remarkable performance in fouling mitigation. The performance is much relevant to the electric and physicochemical properties of the conductive membranes in E-MBR. This study proposed a facile method to prepare a conductive membrane with low electrical resistance and enhanced hydrophilicity. Oxidative polymerization of pyrrole doping with ionic liquids was conducted on the surface of polyvinylidene fluoride (PVDF) membranes. Among the studied ionic liquids, 1-butyl-3-vinylimidazolium tetrafluoroborate (BVIMBF 4 ) was the most suitable in this work. The electrical resistance of the PVDF membrane modified by pyrrole and BVIMBF 4 (PPy-BVIMBF 4 /PVDF membrane) was as low as 9.76 Ω/sq, and its water contact angle reduced from 81° to 45°. In the fast-filtration tests, these conductive microfiltration membranes exhibited high rejections of Cu 2+ ions (~85%) and Ni + ions (~65%) and enhanced antifouling performance during the bovine serum albumin filtration with the application of an electric field. A long-term E-MBR operation demonstrated that the transmembrane pressure (TMP) rise and the flux decline of the PPy-BVIMBF 4 /PVDF membrane were significantly alleviated due to its improved conductivity and hydrophilicity. Its total membrane resistance for water transport was only 27% of the base PVDF membranes under a minute electric field of 0.8 V/m. Overall, the incorporation of ionic liquids in the oxidative polymerization of pyrrole offers a novel and effective strategy in conductive membrane fabrication and serves as an excellent method in fouling mitigation in MBR.
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
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2018
·
IF 3.794
Weiya Zhu,Yang Liu,Kang Guan,Cheng Peng,Wanqi Qiu,Jianqing Wu
A dual-layer alumina microfiltration membrane with super permeability and high selectivity was prepared by co-sintering the membrane and the support. Silica sol as sintering aid for the supports can also promote adhesion between supports and membranes. Tape-casting technique was introduced here to form the pre-membranes which were directly transfer-coated on the green support bodies. The optimum co-sintering conditions and the effects of organic agent content and membrane thickness on the membrane performance were comprehensively investigated. The optimized ceramic membrane had an average pore size of 249 nm and a water permeance of 5040 Lm −2 h -1 bar -1 after co-sintering at 1300 °C for 2 h, which also exhibited a rejection rate of 96.2% for the carbon ink with an average particle size of 237 nm. This work provides a new method for efficient and low-cost preparation of high-performance ceramic membranes.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2022
·
IF 13.4
Qian Jiang,Yaxin Wang,Yuling Xie,Ming Zhou,Qilin Gu,Zhaoxiang Zhong,Weihong Xing
Both the pore size and surface properties of silicon carbide (SiC) membranes are demonstrated to significantly affect their separation efficiency when used for oily water treatment. However, the potential influences of open porosity together with the pore size of SiC membranes on their surface properties and oil-water separation performance have rarely been investigated. In this work, porous SiC ceramic membranes with tunable open porosity and pore size were purposely prepared and selected to systematically study the effect of pore structure-dependent wettability on the oil-water separation performance. The measured pure water flux of selected membranes as a function of open porosity (34–48%) and pore size (0.43–0.67 μm) was well-fitted by using a modified H-P equation. Interestingly, the hydrophilicity of SiC membranes was improved with the increase in open porosity and pore size, as evidenced by the gradually decreased dynamic water contact angle and underwater adhesion of oil droplets. Further, the open porosity of SiC membranes was found to contribute more to the improved surface wettability. As a result, the stable flux of SiC membranes in oil-in-water (O/W) emulsions was increased by 24% with the increased open porosity while the oil rejection rate remained above 90%. This work quantitatively reveals the contributions of the pore structure to the surface wettability of ceramic membranes, and thus provides an effective pathway to improve their performance in oil-water separation.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2017
·
IF 6.065
Xueye Wang,Zhiwei Wang,Haiqin Chen,Zhichao Wu
Efficient removal of toxic metals using low-pressure membrane processes from contaminated waters is an important but challenging task. In the present work, a conducting microfiltration membrane prepared by embedding a stainless steel mesh in the active layer of a polyvinylidene fluoride membrane is developed to remove Cu(II) ions from contaminated waters. Results showed that the conducting membrane had favorable electrochemical properties and stability as cathode. Batch tests showed that Cu(II) removal efficiency increased with the increase of voltages and leveled off with the further enhancement of electric field. The optimal voltages were determined to be 1.0 V and 2.0 V for the influent Cu(II) concentrations of 5 mg/L and 30 mg/L, respectively. X-ray photoelectron spectroscopy and X-ray diffraction results demonstrated the presence of Cu(0) and Cu(OH) 2 on the membrane surface. The removal mechanisms involved the intrinsic adsorption of membrane, electrosorption of membrane, adsorption of deposited layer, chemical precipitation of Cu(OH) 2 and deposition of Cu(0) which were aided by electrophoresis and electrochemical oxidation-reduction. Long-term tests showed that the major contributors for Cu(II) removal were the deposition of Cu(0) by electrochemical reduction-oxidation (47.3% ± 8.5%) and chemical precipitation (41.1% ± 0.2%), followed by electrosorption, adsorption by the fouling layer and membrane intrinsic sorption.
研究领域:
环境科学
·
材料科学
✓ 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）