JOURNAL OF MEMBRANE SCIENCE
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2025
·
IF 9
Kaili Jin,Liujun Pei,Zaisheng Cai,Yudie Zhou,Xiner Zhang,Yaping Zhao,Hongjuan Zhang,Qun Yang,Shuaitong Liang,Jiping Wang
Smarting gating microfiltration membranes that can adjust the pore size according to the composition of the wastewater are expected to solve the problem of membrane's limited adaptability to complex oily wastewater. However, the design of a responsive adjustment system capable of manipulating micropore sizes and constant wettability remains a dilemma. Herein, an innovative fiber-based membrane (named PAN/PNIPAm-CF/MWCNT/FeOOH) was developed by skillful introducing poly (n-isopropylacrylamide) (PNIPAm) microgels into the porous channel of the sieve layer. By controlling the physical collapse of PNIPAm microgels, the micro-sized pores have been successfully reversibly adjusted from small size at room temperature to large size when exposed to high temperature, while not changing their wettability. Under a flux conversion rate of more than 200 %, the PAN/PNIPAm-CF/MWCNT/FeOOH membrane could quickly pretreat complex oily wastewater discharged from production lines with high temperature (removal of large oil droplets), then carry out in-depth purification at low temperature (removal of emulsified oils, metal ions, dye micelles, etc.). Besides, the PAN/PNIPAm-CF/MWCNT/FeOOH membrane showed good stability and resistance to harsh environment during long-term filtration. Thereby, the design of fiber-based membranes with micropore smart control capability and constant wettability provides innovative ideas for industrial complex oily wastewater treatment.
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
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Haijing Lu,Yuhan Zhang,Bin Zhang,Shuai Jiang,Nannan Qu,Chaohu Xiao,Li Li,Guihua Li,Lihua Chen
Water is the lifeblood of everything on earth, nourishing and nurturing all forms of life, while also contributing to the development of civilization. However, with the rapid development of economic construction, especially the accelerated process of modern industrialization, the pollution of oily sewage is becoming increasingly serious, affecting the ecological balance and human health. The efficient elimination of pollutants in sewage is, therefore, particularly urgent. In this paper, a core–shell microbial reactor (MPFA@CNF-SA-AM) was fabricated by using nanocellulose and sodium alginate (SA) particles embedded with microorganisms as the core and lipophilic and hydrophobic fly ash as the outer shell layer. Compared with that of free microorganisms and cellulose and SA aerogel pellets loading with microorganisms (CNF-SA-AM), which has a degradation efficiency of 60.69 and 82.89%, respectively, the MPFA@CNF-SA-AM possesses a highest degradation efficiency of 90.60% within 240 h. So that this self-floating microbial reactor has selective adsorption properties to achieve oil–water separation in oily wastewater and high effective degradation of organic pollutants with low cost. The adsorption curves of MPFA@CNF-SA-AM for diesel and n-hexadecane were studied. The results showed that the adsorption follows the Freundlich model and is a multimolecular layer of physical adsorption. In addition, the degradation mechanism of diesel oil was studied by gas chromatography–mass spectrometry. The results showed that diesel oil was selectively adsorbed to the interior of MPFA@CNF-SA-AM, and it was degraded by enzymes in microorganisms into n-hexadecanol, n-hexadecaldehyde, and n-hexadecanoic acid in turn, and finally converted to water and carbon dioxide. Compared with existing oily wastewater treatment methods, this green and pollution-free dual-functional core–shell microbial reactor has the characteristics of easy preparation, high efficiency, flexibility, and large-scale degradation. It provides a new, effective green choice for oily wastewater purification and on-site oil spill accidents.
研究领域:
环境科学
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生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
WATER ENVIRONMENT RESEARCH
·
2024
·Vol. 96
·期 4
·e11022
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IF 2.5
Yin-liang Lin,Ming-xin Zhao,Ya-lan Yu,Sheng-li Liu,Min Li,A-li Jiang,Min Deng
A microfluidic strategy of smart calcium alginate (CA) capsules is presented to immobilize Pseudomonas aeruginosa to treat oil slicks effectively. The capsule wall is embedded with poly ( N -isopropyl acrylamide) sub-microspheres as thermo-responsive switches. CA capsules, with a diameter of 3.26 mm and a thin wall thickness about 12.8 μm, have satisfying monodispersity, cavity structure, and dense surface structures. The capsules possess excellent encapsulation of bacteria, which are fixed in a restricted space and become more aggregated. It overcomes the disadvantages of a long fermentation production cycle, easy loss of bacteria, and susceptibility to shear effect. The smart CA capsules immobilized with bacteria treat model wastewater containing soybean oil or diesel and display favorable fermentation ability. The capsules can effectively treat oil slicks with high concentration, and it is an economical way for processing oily wastewater. Practitioner Points A thermo-responsive calcium alginate capsule was prepared by microfluidic strategy. Pseudomonas aeruginosa is environmentally friendly in treating oil slicks. The capsules, immobilized bacteria, treat oil slicks effectively. This study provides an economical way for processing different oily water.
研究领域:
环境科学
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微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2019
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IF 4.084
Mi Yan,Jianyong Liu,Dwi Hantoko,Ekkachai Kanchanatip,Nurak Grisdanurak,Yi Cai,Zengliang Gao
This paper presents the results from experimental study of syngas production by catalytic cracking of tar in wastewater under supercritical condition . Ni/Al 2 O 3 catalysts were prepared via the ultrasonic assisted incipient wetness impregnation on activated alumina , and calcined at 600 °C for 4 h. All catalysts showed mesoporous structure with specific surface area in a range of 146.6–215.3 m 2 /g. The effect of Ni loading (5–30 wt%), reaction temperature (400–500 °C), and tar concentration (0.5–7 wt%) were systematically investigated. The overall reaction efficiency and the gas yields, especially for H 2 , were significantly enhanced with an addition of Ni/Al 2 O 3 catalysts. With 20%Ni/Al 2 O 3 , the H 2 yield increased by 146% compared to the non-catalytic experiment. It is noteworthy that the reaction at 450 °C with the addition of 20%Ni/Al 2 O 3 had a comparable efficiency to the reaction without catalyst at 500 °C. The maximum H 2 yield of 46.8 mol/kg tar was achieved with 20%Ni/Al 2 O 3 at 500 °C and 0.5 wt% tar concentration. The catalytic performance of the catalysts gradually decreased as the reuse cycle increased, and could be recovered to 88% of the fresh catalyst after regeneration. 20%Ni/Al 2 O 3 has a potential to improve H 2 production, as well as a good reusability . Thus, it is considered a promising catalyst for energy conversion of tar in wastewater.
研究领域:
能源化学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
PETROLEUM SCIENCE AND TECHNOLOGY
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2022
·
IF 1.695
Huili Zhang,Min Li,Jinjun Deng,Hailin Yu,Yanbin Tong,Lingmin Wu,Liqun Sun,Hongsheng Liu
Whether the oilfield sewage index can reach the reinjection specification is a crucial issue that is urgently need to be solved in polymer flooding systems. Thus the coagulability and floc morphology development of dual coagulants was systematically studied in different pH oily wastewaters. Acidification improved the deprotonation ability of coagulant. Hydrophobic associative polyaluminum silicate-poly dimethyl diallyl ammonium chloride (PASSC-PD) resolved the problem of excessive acid addition. The dual coagulants prepared not only preserved the high charge density of polyaluminum silicate (PASS) itself but also made it have the hydrophobic association and strong bridging ability. Besides, PASSC-PD was compared with hydrophobic associative polyaluminum silicate (PASS-C), PASS, and poly dimethyl diallyl ammonium chloride (PDMDAAC) pertaining to the polymer flooding oily sewage of Daqing Oilfield. The coagulation result demonstrated that PASSC-PD exhibited more advantageous turbidity and oil removal efficiencies than PASS-C, PASS, and PDMDAAC. The floc morphology result showed that adding dual coagulant made the petal-like floc of oily sewage larger at the pH value of 6. Furthermore relevant results evidenced that the coagulant had more successful fruits of turbidity removal of 96.5% and oil removal of 96.3% under weak acid conditions. These can satisfy the reinjection condition of oily sewage.
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
Journal of Bionic Engineering
·
2024
·Vol. 21
·期 2
·913-923
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IF 4.9
Liu Xingyu,Chen Junxu,Wang Rui,Su Yifan,Zhou Zhangheng,Hou Zezhong,Li Zhuoran,Zhao Junhao,Shi Weicai,Yu Xinquan,Yu Zhaopeng,Zhang Youfa
The produced water from the oilfield was purified with filter material and then injected back into the ground. The serpentine filter material was easy to harden with the increase in filtration amount, which affected the water quality. A superhydrophilic/underwater oleophobic serpentine filter material was successfully prepared by a simple method of coating modification, which exhibited long-lasting filtration of oily water, good filtration and anti-fouling properties, and resistance to harden. The film-forming material of the superhydrophilic/underwater oleophobic coating was composed of SiO 2 particles with small size, which could completely and evenly cover the filter particle. The weight loss was only 7.6% after mechanical stirring for 90 min. Compared with the original filter material, the superhydrophilic/underwater oleophobic serpentine filter material showed a better anti-fouling ability and resistance to harden. The filtration of crude oil emulsion and oil slick sewage showed a better backwashing performance. After 35 cycles of continuous filtration of suspended solids in wastewater, the backwashing rate reached 78.4%. The results provided an effective method for the filtration of oily wastewater in the oilfield.
研究领域:
环境工程
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材料科学
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化学工程
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石油工程
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水处理技术
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2021
·Vol. 138
·期 29
·50706
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IF 3.125
Jie He,Ming Duan,Xiujun Wang,Manlin Wang,Bo Jing,Shuai Liu,Shenwen Fang
Copolymerization of cationic monomer and nonionic macromonomer in water-ether mixture solution is useful for preparing the functional polymer. Copolymer of diallyldimethylammonium chloride (DMDAAC) and a nonionic block polyether macromonomer (PEP-65) has been found that has very well reverse demulsification performance, but the polymerization phenomenon cannot be described by any reported polymerization method. In this paper, the copolymerization behavior including polymer mechanism, polymerization kinetics, and reactivity rate of DMDAAC and PEP-65 in the mixture solution of water and propylene glycol methyl ether (PGME) was studied for explaining the special copolymerization phenomenon and its flotation performance for treating oily wastewater was also investigated. The results showed that DMDAAC-PEP-65 copolymerization in water-PGME mixture solution has four stages and has both characteristics of emulsion polymerization and dispersion polymerization. In addition, the copolymer also has excellent flotation performance.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 19
·56198-56206
·
IF 5.8
Wang Tianshu,Shi Peibo,Wang Mingyu,Zhang Shaojun
Oily sewage discharged from ships has brought many harms to the marine environment, even endangered marine life and human life. As a new type of water treatment technology, microbial fuel cell (MFC) can efficiently treat pollutants and recover energy, which can be converted into electric energy. However, its large internal resistance restricts its development. In order to solve the problems of low power generation performance and poor biocompatibility of microbial fuel cell, a gold nanoparticle-carbon quantum dot/polydopamine/graphene oxide/bacterial cellulose (AuNP-CQD/PDA/GO/BC) electrode was prepared, and it was applied to the treatment of oily sewage from ships. Fourier transforms infrared spectroscopy, X-ray diffraction, scanning electron microscopy, gas chromatography-mass spectrometry, and contact angle measuring instrument were used to characterize the electrode. The results show that PDA bridges GO and AuNP-CQD particles through the electrostatic interaction/π-π bond/hydrogen bonding, respectively. This attracts a large number of microorganisms to attach to the surface of the porous anode material, which greatly improves the activity and quantity of microorganisms. Moreover, the maximum power density of AuNP-CQD/PDA/GO/BC electrode is 2624.91 mW/m 2 , which obviously improves the electrochemical performance of MFC. The oil content of the treated water is ≤ 15 mg/L, reaching the discharge of MARPOL 73/78 convention. Therefore, the proposed approach has paved new dimensions in not only the preparation of a new composite electrode materials but also its applications as effective degradation of ship oily sewage in MFC.
研究领域:
环境科学
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材料科学
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微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2021
·
IF 5.876
Ming Cao,Yingbo Chen,Xiujing Huang,Lei Sun,Jiaopeng Xu,Kang Yang,Xinyu Zhao,Ligang Lin
ABSTRACT The construction of highly efficient membranes toward oil/water separation is crucial in severe oily sewage treatment while graphene materials are considered stable blocks for oil/water separating membranes. Herein, first, with the presence of graphene oxide, in-situ polymerization of caprolactam was carried out and polyamide-6-reduced graphene oxide composites (PA6-rGO) were successfully synthesized. Then the PA6-rGO nanofiber membranes were prepared by electrospinning combining electrospraying process. Nanofiber skin with microshphere/bead fiber structure on the surface of ordinary electrospun fiber membrane was prepared in 2 steps. Hence the nanofiber membrane separation performance to emulsions under gravity driving was investigated. The results showed that the flux of surfactant-stabilized emulsions would reach up to 765.4 Lm −2 ·h −1 with the rejection up to 99.6%. It is expected to be practically applied in a low-pressure driven membrane separation system to achieve preliminary separation of severe oily sewage.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Xiaotong Wang,Yaxin Liu,Ming Zhang,Zhuo Luo,Dongzhi Yang
The development of switchable wettability membranes with high permeation fluxes is crucial for oily sewage treatment. A hierarchical beadlike porous PS fibrous membrane with pH-switchable wettability was precisely fabricated by nonsolvent-induced phase separation during electrospinning, followed by UV photografting copolymers of 2-(dimethylamino) ethyl acrylate (DMAEA) and 3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl acrylate (TFOA). The designed unique structure notably increases the roughness of surface and enhances superwettability. Protonation of the amine groups on the fibers triggered by an acid solution (pH < 2) induces underwater superoleophobicity, which in turn causes superoleophilicity in a neutral or basic solution. The as-prepared fibrous membrane can effectively separate the hexane/water mixture with an oil flux of 10 186.8 L m–2 h–1 and a separation efficiency of 99.2% only driven by gravity. Especially, excellent separation performances (water fluxes) were also realized for other oil/water mixtures with higher viscosity by switching the wettability from superoleophilicity to hydrophilicity. Moreover, the as-prepared fibrous membrane can also be applied to a continuous T-shaped tube device delivering a high handling capacity of 6631.5 L m–2 h–1, which provides the oily sewage treatment with a facile strategy in practical application.
研究领域:
材料科学
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环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Hailin Yu,Huili Zhang,Zhengnan Sun,Yingjun Wang,Hongsheng Liu,Yanbin Tong,Lingmin Wu,Jinjun Deng,Liqun Sun
When the amount of anionic polyacrylamide (APAM) and petroleum sulphonate in polymer-flooding oily sewage increases, a stable emulsification system forms. This makes the treatment of oily sewage increasingly difficult. To better develop high-efficiency coagulants from scratch, this study first determined the structure and carbon number of petroleum sulphonate using 1 H NMR and 13 C NMR spectroscopy. Then, hydrophobic monomers with different chain lengths were copolymerised with aluminium salts to prepare inorganic polymer coagulants with different hydrophobic association abilities. Three novel coagulants were successfully prepared, as verified by FTIR and hydrodynamic radius detection, and their coagulation mechanism and performance in oily sewage were investigated and compared with (polyaluminium silicate sulphate) PASSi. The particle size and morphology of flocs after the addition of coagulant were detected by laser particle size analysis and scanning electron microscopy. The structure-activity relationship between emulsifiers and coagulants with different chain lengths was studied via the second virial coefficient A 2 . Polyaluminium silicate sulphate-hexadecyltrimethoxy (PASSi-C16) was determined to have the best coagulation effect by turbidity , oil removal rate and Zeta potential detection. This may have been due to PASSi-C16 containing a similar lipophilic group to the carbon chain structure of petroleum sulphonate, which could easily destroy the emulsion layer. These results provide insights into methods to improve the hydrophobic association capacity and for the targeted use of associative coagulants in large-scale applications.
研究领域:
环境工程
·
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）