ADVANCES IN POLYMER TECHNOLOGY
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2015
·Vol. 34
·期 3
·
IF 1.045
Ting Lü,Hongting Zhao,Dongming Qi,Ying Chen
This study reported the successful synthesis of a new amphiphilic and cationic flocculant (denoted as CS- g -PDBC) by grafting a cationic monomer, dimethyl acryloyloxyethyl benzyl ammonium chloride (DBC), onto chitosan (CS) initiated by ceric ammonium nitrate. The molecular structure and surface morphology of the newly synthesized graft copolymer CS- g -PDBC were characterized in detail by using Fourier transform infrared spectroscopy, X-ray powder diffraction, field emission scanning electron microscope, thermogravimetric analysis , and elemental analysis. Moreover, its flocculation efficiency for treating simulated emulsified oil wastewaters was evaluated and the results indicated that CS- g -PDBC was more efficient than those of CS and two other commonly used flocculants, i.e., cationic polyacrylamide and polyaluminum chloride. It was found that, as compared with CS, the successful introduction of cationic and hydrophobic groups into the CS backbone resulted in a significantly broadened flocculation window and a greatly enhanced flocculation efficiency for the prepared CS- g -PDBC in the treatment of oily wastewater, suggesting that this newly synthesized CS- g -PDBC would be a promising green agent for oily wastewater treatment.
研究领域:
环境科学
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材料化学
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DOI
高影响因子
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
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2016
·Vol. 94
·期 12
·2298-2302
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IF 1.066
Shenwen Fang,Ying Zhu,Bin Chen,Yan Xiong,Ming Duan
In this study, a magnetic demulsifier, called M-DMEA, was prepared by “one-pot” synthesis through the pyrolysis of ferric triacetylacetonate (Fe(acac) 3 ) in DMEA 1231, which is a type of polyether demulsifier used in oil fields. The morphologies and phase compositions of the M-DMEA nanoparticles were determined by transmission electron microscopy and X-ray diffraction, respectively. The presence of surface coating was confirmed by using Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analyses (TGA). Magnetic property was measured by vibrating sample magnetometer. The demulsification of M-DMEA for treating oily wastewater produced from polymer flooding (OWPF) was investigated. It was found that the oil removal of M-DMEA reached 96.0 % at the concentration of 4.0 g/L. In addition, M-DMEA can be recycled and reused by using an external magnet. The results showed that there was a significant decrease in the oil removal after two cycles because the polymer residue remaining in OPWF, namely partially hydrolyzed polyacrylamide (HPAM), was adsorbed onto the surface of M-DMEA.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Processes
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2021
·Vol. 9
·期 9
·1665
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IF 2.847
Ying Xu,Wei Wang,Zhigao Zhu,Bin Xu
The issue of oily wastewater treatment has become a worldwide challenge due to increasing industrial oily wastewater and frequent oil spill accidents. As an integral part of practical sewage treatment, pretreatment is conducted to remove inorganic particles, floating oil, and some emulsified oil, and to pave the way for post-treatment. Here, we report a facile fabricated, hydrostable, and rapid underwater-formed superoleophobic copper mesh with polydopamine (PDA) coating for efficient oily wastewater pre-treatment. Unlike with traditional technologies, using the interface phenomenon to solve the problem of oil/water mixture separation provided a new approach for the low energy input pretreatment process. The PDA coating formed by the in situ Fenton method not only rapidly constructs a protection layer for the etched hierarchical micro-size particles on mesh and results in enhanced hydrophilicity, but also exhibits high uniformity and enhanced stability in acid/alkali medium. Benefiting from the above processes, a very high flux of 25 L m−2s−1and high separation efficiency of 99.0% toward various oil/water mixtures were achieved, revealing excellent prospects for practical usage. Therefore, this new approach offered insight into the development of a cost-effective and functional method for efficient pretreatment of oily wastewater.Keywords:in situ Fenton;polydopamine;underwater superoleophobic;oily wastewater pretreatment
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Yilin Shi,Jie Wang,Keru Hou,Chengcheng Li,Chengjian Yao,Xin Dai,Wanli Peng,Zaisheng Cai
Membrane separation materials with special wettability are progressively desired due to economy, high efficiency, and continuous operation. Among them, Janus membrane materials play an important role in controllable oil/water separation with the help of different wettability on each side. However, they still face various challenging problems, such as involvement of toxic chemicals, complexity of the modification process, and poor stability. In this study, based on the yarn functionalization and fabric structure design, double-layer Janus fabric membranes (JF membranes) with hydrophilicity and hydrophobicity were woven on each side of the membranes. The results showed that JF membranes achieved separation efficiency of 99.47 ± 0.35 % and 97.66 ± 0.53 % for light oil/water mixture and heavy oil/water mixture, and the separation flux exceeded 3008.5 L · m −2 · h −1 and 7161.04 L · m −2 · h −1 , respectively. Meanwhile, JF membranes can also separate oil-in-water emulsions (separation efficiency >96.33 %) and water-in-oil emulsions. In addition, JF membranes exhibit desirable chemical stability, mechanical durability and reusability. These results highlight the potential application of JF membranes with asymmetric wettability in oil-water separation and provide a novel, convenient, and feasible strategy for fabricating environmentally friendly membrane separation materials.
研究领域:
材料科学
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环境工程
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膜技术
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分离科学
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DOI
高影响因子
FUEL
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2021
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IF 6.609
Peng Shi,Yuxia Gou,Jiao Li,Qiulu Zheng,Xiao Zhong,Ming Duan,Wanfen Pu
Oily wastewater is a potential resource for recycled crude oil; however, the formation of oil sludge during water disposal makes the oil unrecyclable. In this study, a hydrogel coalescer was prepared by polymerization grafting of acrylamide on a metal tube filter, which separated the emulsion into layers of water and oil when the oily water permeated the 1-mm-thick wall. The oil was easily recycled without any oil sludge formation. The material had an oil removal efficiency of 98% at a high flux up to 5000 L/(m 2 ·h) up to an inlet pressure of 3 bar. The oil exhibited weak adhesion to the coalescer and could be easily flushed away. The fouling analysis showed bubbles, and the formation of the water-in-oil (W/O) emulsion led to the blocking of the pore. After the addition of a demulsifier into the hydrogel, the formation of the W/O emulsion was strongly suppressed, and the material showed an enhanced anti-blocking performance and higher flux. Hence, we developed a potential reagent-free solution for the disposal of oily wastewater and a recycling technique for obtaining crude oil from it.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Wenxuan Cao,Wenjing Ma,Tao Lu,Zhicheng Jiang,Ranhua Xiong,Chaobo Huang
Developing multifunctional, efficient and durable membrane for long-term usage for treating complex oily wastewater is highly desirable but still a challenge due to the severe membrane fouling . Herein, a hierarchical structured superhydrophilic/underwater superoleophobic nanofibrous with antifouling and visible-light-induced self-cleaning performance was manufactured by a facile combination of electrospun silver/β-cyclodextrin/polyacrylonitrile (Ag/β-CD/PAN) nanofibers and then the in-situ growth of a zinc oxide (ZnO) layer. The formed micro/nano sized hierarchical structure greatly increased the roughness and improved the underwater superoleophobic ability of the membrane. Therefore, the resultant ZnO/Ag/β-CD/PAN membrane displays splendid separation performance for oil/dye/water complex emulsions and high flux recovery (>90%). Meanwhile, the permeation flux of a variety of oil/water emulsions was higher than 619 L m −2 h −1 with a separation efficiency above 99.7% under the action of gravity. Furthermore, the as-fabricated membrane exhibits excellent stability towards different harsh conditions (e. g. corrosive solution, high temperature, UV irradiation and ultrasound washing). The robust mechanical and chemical stability, outstanding separation capabilities as well as excellent flux recovery capabilities makes the self-cleaning membrane a good candidate for the remediation of complex oily wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2023
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IF 4.6
Jinhua Deng,Meng Zhu,Zhaoli Wang,Yong Liu
Flocculation is considered an alternative, eco-friendly demulsification technology for treating emulsified oily wastewater. However, conventional flocculants produce a large amount of oily sludge, causing environmental risk as well as oil loss. To address this, we fabricated a demulsifying agent made of iron-modified chitosan (FeO X -CS) for demulsification and reducing the production of oily sludge. The hydrophilicity of the chitosan was enhanced after FeO X modification, which enhanced the hydrogen bond between the flocculant and the oil droplet, and improved the demulsification efficiency. The demulsification efficiency of the FeO X -CS for the oil-in-water (O/W) model emulsions is over 60% after 3 recycles. The demulsification efficiency of FeO X -CS excessed 97% within 60 min at the dosages of FeO X -CS 20 mg/L, initial model emulsion concentration of 200 mg/L, and pH of 7. The demulsified oil mainly exists in water surface and FeO X -CS surface. Thus, the synthesized FeO X -CS is a potential for treating emulsified oily wastewater.
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 LETTERS
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2025
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IF 2.7
Hasan Ali Hayder,Peng Shi,Rui Liu
A superhydrophilic and underwater superoleophobic PVDF membrane, coated with a functionalized copolymer hydrogel, was fabricated for oily water separation. The membrane achieved a permeate flux of 7750 L/(m 2 ·h) and a separation efficiency of 99.0 % for crude oil-in-water emulsions. The functionalized hydrogel also accelerated the coalescence and potential demulsification of the emulsion. This membrane offers a reagent-free and concentrate-free solution for the disposal of oily wastewater and a technique for crude oil recycling.
研究领域:
材料科学
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环境工程
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化学工程
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高分子材料
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膜科学技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Xiao-Li Zeng,Yu-Ling Yang,Yong Zhou,Gang Wang,Zhi-Xiang Zeng,Lu-Li Shen,Li-Jing Zhu
Underwater superoleophobic membranes can inhibit the adhesion of oil droplets and efficiently reduce oil-fouling. However, under the action of transmembrane pressure, the oil inevitably adheres to the membranes, which is difficult to be removed by facile washing. Here, an excellent coupling of underwater superoleophobicity and photo-Fenton oxidation is reported for desired anti-fouling performances. Briefly, composite polypropylene (PP) membranes with stable underwater superoleophobicity and excellent photo-Fenton oxidation efficiency were constructed by depositing hydrophilic α -FeOOH nanorods and mussel-inspired coating in turn. Various stable water-in-oil emulsions can be effectively separated with the obtained membranes. Most importantly, in the presence of H 2 O 2 and visible light, α -FeOOH nanorods can photo-Fenton oxidize oil and dye that break through the underwater superoleophobic defense layer. Therefore, the reversible fouling ratio ( Rr-L ) and the flux recovery ratio ( FRR-L ) improve to 76.8 ± 3.2% and 87.2 ± 2.4% respectively, while the irreversible fouling ratio ( Rir-L ) decreases to 9.9 ± 0.2% for separation pump oil-in-water emulsion containing methylene blue. This work has great potential and strategic value in the treatment of oily wastewater and the preparation of advanced filtration and anti-fouling membranes.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2022
·Vol. 97
·期 8
·2179-2185
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IF 3.709
Yuqing Gao,Baicun Hao,Ni Xue,Yujia Wang,Hanzhong Xiao,Xin Huang,Bi Shi
BACKGROUND Oil pollution has drawn a great deal of attention due to the large quantity of oily wastewater generated from various industries. Some industrial processes discharge corrosive oily wastewater that is difficult to be separated by conventional approaches. Moreover, the co-existence of oil pollution with other pollutants further increases the separation difficulty of oily wastewater. RESULTS Herein, distillers' grains (DG) were utilized as raw materials to prepare mesoporous biochars and further tuned their structure and surface wetting behaviors by steam activation, which improved the contacts between the DG biochars and the oil-in-water (O/W) emulsion droplets for demulsification as well as the volumetric capacity for oil capture. The as-prepared DG biochars realized a highly efficient separation of corrosive O/W nanoemulsions with the separation efficiency high up to 99.9996%. Moreover, the DG biochars separated dye-containing corrosive O/W emulsions with ~100% removal of dyes and obtained a separation efficiency of corrosive O/W emulsions high up to 99.9981%. CONCLUSION We have explored an effective approach for developing mesoporous DG biochars, with tunable pore structure and surface wetting properties, that are highly efficient for separating corrosive O/W emulsions. The present investigation not only provides a useful approach for remedying the contamination caused by corrosive oily wastewater but it also develops a new route for realizing value-added utilization of solid wastes generated by the distilled liquor industry. © 2022 Society of Chemical Industry (SCI).
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Coatings
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2022
·Vol. 12
·期 10
·1598
·
IF 3.236
Kun Peng,Chenglong Wang,Chunyu Chang,Na Peng
Nanocellulose membranes could efficiently separate oily wastewater because of their super-hydrophilic and underwater super-oleophobic property and nano-porous structure. However, the practical application and storage of nanocellulose membranes is limited by their low water permeation flux and easy corrosion by bacteria, respectively. Herein, nanocellulose membranes with high permeate flux and antibacterial property were fabricated by grafting tetrakis(hydroxymethyl) phosphonium chloride (THPC) onto the surface of TEMPO-oxidized tunicate cellulose nanofibers (TCNFs)viaesterification reaction. The introduction of THPC groups with tetrahedral structure on the surface of TCNFs significantly improved the pore size and interlayer space of nanocellulose membranes, resulting in an increase in water permeation flux. These THPC@TCNF membranes were super-hydrophilic and underwater super-oleophobic, which could effectively separate various oil/water nano-emulsions. Moreover, THPC@TCNF membranes possessed excellent durability, mechanical stability and cycling performance. Due to the presence of positively charged phosphonium groups, THPC@TCNF membranes exhibited excellent antibacterial property againstB. subtilis, a typical Gram-positive bacterium presenting in oily wastewater. This work provides a simple method to endow nanocellulose membrane with high permeate flux and antibacterial property.Keywords:phosphonium;nanocellulose membrane;high permeate flux;antibacterial property;oily wastewater separation
研究领域:
材料科学
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环境工程
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生物学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Ximin Chen,Yingqing Zhan,Wei Yang,Ao Sun,Hongshan Jia,Junlei Tang,Bing Lin
The complicated oily wastewater containing hazardous organics post a great challenge to the membrane separation technology . Herein, a multilayer porous multifunctional MXene/MOF composite membrane with high permeability and photocatalytic degradation performance was prepared by embedding rod-shaped MIL-53(Fe) into layered MXene nanosheets and self-assembling them onto porous polyacrylonitrile fibrous mat. It was found that the embedment of rod-like MIL-53(Fe) with rough nanostructures could effectively avoid the dense physical stacking of MXene nanosheets and regulate the layer spacing, which was conducive to the enhancement of water channel and permeability of membrane. Moreover, the hydrophilic modification of TA could render the super-wetting feature (WCA=0°, UOCA>150°) and enhance the oil resistance of the membrane. Thence, the composite membrane exhibited favorable separation flux (904.3 ∼ 1226.5 L·m −2 ·h −1 ) and retention rate (99.06 ∼ 99.62%) for different O/W emulsions. In addition, the coupling of rod-like MIL-53(Fe) and MXene nanosheets endowed the composite membrane with efficient photocatalytic performance, which could degrade various dyes contained in oily wastewater (CV: 62.4%, MeB : 99.0%, CR: 79.5%, MO: 84.1%). Overall, this study opens up a new way for the preparation of super-wetting and multi-functional fibrous composite membrane, showing the broad application prospects in the purification of multi-component oily wastewater.
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
危险品化学品经营许可证（带存储）