SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Pei Lyu,Liangjun Xia,Xin Liu,Christopher Hurren,Weilin Xu,Xungai Wang
Environmental pollution and resource waste are two major concerns with the development of civilization. During hemp fiber separation short fiber noil is produced as a waste. This paper demonstrates the reuse of waste hemp noil by dissolution in a precooled NaOH/urea system to form porous aerogels. After hydrophobization, the hemp aerogels exhibited self-cleaning ability and could be used for oil adsorption and air purification. The superhydrophobic hemp aerogels exhibited elastic behavior with 75 % recoverable strain after 10 cycles of compression. The high porosity and compressibility endowed hemp aerogels with excellent oil absorption capacity and reusability. With a fiber concentration of 1.5 %, the hemp aerogel could achieve an oil removal of 29.4 times of its own weight, whilst 85.4 % of the initial absorption capacity remained after 10 absorption/desorption cycles. The ultrafast oil absorption was completed within 0.048 s. The oil contaminated hemp aerogel could be self-cleaned in an ethanol solution. The hemp aerogels also had high removal efficiencies of particulate materials (PM) such as PM 2.5 and PM 10 at both 94 %. The remodeled waste hemp noil showed great potential in environmental governance and recycling of natural resources.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Qing-Ming Wang,Zhen-Hui Liu,Qiu-Feng Lü
Traditional separation materials based on Ti 3 C 2 T x modification are susceptible to contamination by oily substances and have single performance, which limits their applications in treatment of actual oily wastewater. Here, to improve the hydrophilicity and stability of Ti 3 C 2 T x , EHL-functionalized Ti 3 C 2 T x (EHL-Ti 3 C 2 T x ) was prepared by enzymatic hydrolysis lignin (EHL) forming secondary bonds with the terminal oxygen-containing groups on the surface of Ti 3 C 2 T x . EHL-Ti 3 C 2 T x was further coated on polyurethane (PU) sponge to construct rough structures, enabling the modified EHL-Ti 3 C 2 T x @PU sponge superhydrophilic/underwater superoleophobic wettability to achieve separation efficiency above 99.5% for different oil/water mixtures. Especially, the maximum permeation flux of EHL-Ti 3 C 2 T x @PU for cyclohexane/water mixture separation is up to 231,321 L m −2 h −1 . In addition, the functionalized interface constructed by EHL- Ti 3 C 2 T x on mixed cellulose ester (MCE) membrane exhibits high permeability to malachite green and methylene blue cationic dyes with rejection rates of 99.1% and 98.1%, respectively. Therefore, two separation materials obtained by decorating EHL-Ti 3 C 2 T x on PU and MCE substrates have extremely potential in treating complex wastewater.
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Petroleum Science
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2022
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IF 4.757
Yi-Ning Wu,Li-Sha Tang,Yuan Li,Li-Yuan Zhang,Xu Jin,Ming-Wei Zhao,Xiang Feng,Cai-Li Dai
A deep understanding of the geometric impacts of fracture on fracturing fluid flowback efficiency is essential for unconventional oil development. Using nuclear magnetic resonance and 2.5-dimensional matrix-fracture visualization microfluidic models, qualitative and quantitative descriptions of the influences of connectivity between primary fracture and secondary fracture on flowback were given from core scale to pore network scale. The flow patterns of oil-gel breaking fluid two-phase flow during flowback under different fracture connectivity were analyzed. We found some counterintuitive results that non-connected secondary fracture (NCSF, not connect with artificial primary fracture and embedded in the matrix) is detrimental to flowbackefficiency. The NCSF accelerates the formation of oil channeling during flowback, resulting in a large amount of fracturing fluid trapped in the matrix, which is not beneficial for flowback. Whereas the connected secondary fracture (CSF, connected with the artificial primary fracture) is conducive to flowback. The walls of CSF become part of primary fracture, which expands the drainage area with low resistance, and delays the formation of the oil flow channel. Thus, CSF increases the high-speed flowback stage duration, thereby enhancing the flowback efficiency. The fracturing fluid flowback efficiency investigated here follows the sequence of the connected secondary fracture model (72%) > the matrix model (66%) > the non-connected secondary fracture model (38%). Our results contribute to hydraulic fracturing design and the prediction of flowback efficiency.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Chunping Su,Mengxi Cheng,Fan Tian,Fengxi Chen,Rong Chen
In this work, gold/bismuth oxychloride (Au/BiOCl) nanocomposites with different morphologies were successfully prepared by simple solvothermal method and sodium borohydride reduction method, which exhibited significantly efficient visible-light-driven photocatalytic disinfection for Staphylococcus aureus ( S.aureus ). Particularly, the flower-like Au/BiOCl nanocomposite showed the highest photocatalytic bactericidal performance among the prepared Au/BiOCl samples. The radical trapping experiments revealed that the hole was the main reactive species responsible for the inactivation of S.aureus over Au/BiOCl composite. The enhanced photocatalytic bactericidal effect could be attributed to the enhanced adsorption intensity of visible light that originated from the surface plasmon resonance (SPR) effect of Au, rapid transfer and space transport of hot electrons caused by the hierarchical structure of BiOCl layered compound. Furthermore, the Au/BiOCl coating prepared on stainless steel wire mesh via in-situ synthesis method exhibited excellent superhydrophilic/underwater superoleophobic performance, which endowed the coating with anti-oil-fouling in water. More importantly, compared with Au/BiOCl powder catalyst, the prepared Au/BiOCl coating with anti-oil-fouling also possessed high photocatalytic bactericidal activity and stable recycling performance.
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PubMed
高影响因子
Membranes
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2022
·Vol. 12
·期 8
·757
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IF 4.562
Songhong Yu,Yu Huang,Lixun Zhang,Qian Wang,Zhaohui Wang,Zhaoliang Cui,Enrico Drioli
Poly(ethylene-chlorotrifluoroethylene) (ECTFE) membrane is a hydrophobic membrane material that can be used to recover water from high-humidity gases in the membrane condenser (MC) process. In this study, ECTFE membranes were prepared by the thermally induced phase separation (TIPS) method using the green binary diluents triglyceride diacetate (TEGDA) and trioctyl trimellitate (TOTM). Thermodynamic phase diagrams of the ECTFE/TEGDA: TOTM system were made. The effects of the diluent composition and cooling rate on the structure and properties of the ECTFE membranes were investigated by characterizing the SEM, contact angle, mechanical properties, pore size and porosity. The results showed that ECTFE membranes with cellular structure were successfully prepared and exhibit good mechanical properties. Moreover, increasing the TOTM content in the binary diluents and decreasing the cooling rate could effectively improve the mean pore size of the ECTFE membranes, but the increase in TOTM content reduced the mechanical properties. During the MC process, the water recovery performance of ECTFE membranes increased with the increase in the mean pore size of the membranes, and the condensation flow and water recovery of membrane prepared at 20% TOTM were 1.71 kg·m−2·h−1and 54.84%, respectively, which were better than the performance of commercial hydrophobic PVDF membranes in the MC. These results indicated that there is good potential for the application of ECTFE membranes during the MC process.Keywords:ECTFE membrane;membrane condenser;binary diluents
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高影响因子
Journal of Cleaner Production
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2022
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IF 11.072
Ma Wenjing,Dai Shanshan,Li Xiaojiang,Hongsheng Lu
Oily wastes are easily generated in many processes of exploitation, solvent extraction is the common method for treating the oily waste. However, traditional solvent extractions are difficult to recycle the solvent, and oil is difficult to separated. As a low-volatility solvent, ionic liquid is simple in synthesis, low in cost, so it has good application prospect. In this work, the sustainable separation of oil from oily waste was implemented by using CO 2 -switchable ionic liquids. On the basis of solvent extraction, ionic liquids can reduced losses and costs. The CO 2 -switchable ionic liquids were prepared by poly (propylene glycol) bis(2-aminopropyl ether) D-230 and fatty acids with low volatility at the mole ratio of 1:2. Upon the alternate bubbling CO 2 and N 2, ionic liquids could be transformed alternately from water-miscible state to water-immiscible state. The water-immiscible state was bi-phasic system containing hydrophobic fatty acids and ammonium bicarbonate solution by bubbling CO 2 . Based on the bi-phasic system, the oil (kerosene, paraffin oil and crude oil) could be mixed with fatty acids, and were separated from fatty acids in the hydrophilic state upon N 2 , where the recovery rate of oil was more than 97% and fatty acids was not residual in recovered oil. Treating oily waste, the oil could be extracted from oily waste by the bi-phasic system. The ionic liquids were reused and the oil was separated by bubbling N 2 without extra additives, where the recovery rate of oil from oily waste was more than 85.57%. Due to the simplified process and negligible solvent loss, the economic benefit of recovering per barrel crude oil reached 76.7% of the price of crude oil. Compared with the existing technology , this sustainable separation is simpler, more economical and more environmentally friendly. Hence, it is expected that this sustainable separation based on CO 2 -switchable ionic liquids will meet the development of green separation with low-energy consumption.
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LANGMUIR
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2022
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IF 4.331
Yang Yang,Li Wang,Xiaojiang Li,Dan Liu,Shanshan Dai,Hongsheng Lu
Phase-selective organogelators (PSOGs) have recently attracted more attention because of their advantages in handling oil spills and leaked organic solvents. However, it is difficult to separate and recover the organic phase and PSOGs from organic gels due to the strong interaction between them. Aiming to enhance the separation and recovery performance of the organic phase and PSOGs, we synthesized a series of pH-responsive PSOGs by using itaconic anhydride and fatty amines with carbon chain lengths of C12–C18. Here, PSOGs have an excellent gelation ability in that amounts of organic solvents and fuel oil can be solidified at a low concentration (<3 wt %). It is worth noting that these gels are stronger, which is more convenient for removal by a salvage operation. More importantly, compared with traditional organogelators, pH-responsive PSOGs can easily recover the organic phase and fuel oil with an adjustment of the pH without extraction or distillation. Because of the transformation between the hydrophilicity and hydrophobicity of PSOGs by pH stimulation, 83.15% PSOGs are recovered in three-cycle experiments. In addition, the recycled PSOGs can be used to realize the removal of the organic phase again. Herein, we find that pH-responsive PSOGs could be used as promising and sustainable materials for separating and recovering organic solvents/oils and PSOGs.
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高影响因子
ACS Applied Nano Materials
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2022
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IF 6.14
Keda Jiang,Feiran Li,Xuezeng Zhao,Yunlu Pan
Solid materials ubiquitously suffer from oil fouling in engineering applications. In this work, a facile and economical method was proposed to prepare a substrate-independent self-cleaning coating with remarkable oil repellency, which were realized by dints of the surface of nanocomposite structures with polar groups introduced by silica nanoparticles and polydopamine. The dip coating preparation process can be carried out in an ambient atmosphere without the use of hazardous reagents or complex equipment. The coating displays self-cleaning performance to detach the adhered oil after being immersed into water. The underwater contact angles were measured over 150° to various oils, further retaining stability in corrosive aqueous environments. Moreover, the coated glass shows resistance to water condensation, which can remain transparent after steaming or frosting, due to its hydrophilicity. The special wettability also endows the coated fabric with permselectivity to water and oil. Modified filter cotton was utilized to separate five kinds of oil/water mixtures. This study proposed a tried-and-true approach to realize oil repellency. It is anticipated that it could set a precedent for the design of self-cleaning or antifouling coatings.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Yiwen Wang,Xiangyu Liu,Qingdong He,Xue Wang,Hang Lu,Fang Guo,Yujie Zhang,Wenbo Wang
Purifying stubborn wastewater containing stable oil droplets, high levels of oils, and other contaminants such as dyes to obtain fresh water is highly desirable but challenging. Here, a magnetically recyclable multifunctional β -cyclodextrin ( β -CD)-modified sepiolite@Fe 3 O 4 (SP@Fe 3 O 4 /APTES-CD) composite demulsifier with excellent demulsification capability and dye removal efficiency was developed, and the high-efficiency purification of the complex and stable emulsified wastewater with or without dyes was achieved after treatment with the demulsifier. The composition, structure and physicochemical properties of the multifunctional demulsifiers were discussed in detail, and the effects of the components in the emulsion (e.g., salts, oils, and surfactants) on the demulsification efficiency of the demulsifier were evaluated. It was revealed that the usage condition of the SP@Fe 3 O 4 /APTES-CD demulsifier is not limited by the types of water and oils. The demulsifier can purify not only the oil/deionized water emulsions, but also the oil/natural water (seawater, Yellow River water and Yangtze River water) emulsion with a very high oil-water separation efficiency of 99.6%. The oil-water separation efficiency of n-hexane/water, kerosene/water, gasoline/water, carbon tetrachloride/water, and soybean oil/water emulsions by the demulsifier are 98.5%, 99.8%, 99.1%, 98.7% and 99.2%, respectively. The anionic dye Congo red (CR) and cationic dye Methylene blue (MB) in the surfactants-stabilized O/W emulsion can be simultaneously removed after demulsification process with a removal efficiency larger than 99%. The demulsification process of surfactant-stabilized emulsion with the demulsifier can be accelerated by applying an external magnetic field to realize magnetically controlled demulsification. In addition, the SP@Fe 3 O 4 /APTES-CD demulsifier is very effective in separating and purifying the practical emulsified wastewater produced from steel mills within 20 s to obtain clean water. The demulsifier can still keep better demulsification efficiency after being recycled and reused for more than ten cycles.
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ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 27
·2201035
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IF 19.924
Yaoxia Li,Zehang Cui,Guoqiang Li,Haoyu Bai,Ruyuan Dai,Yingzi Zhou,Yan Jiao,Yuegan Song,Yi Yang,Senyun Liu,Moyuan Cao
Manipulating oil droplets in an aqueous solution offers great opportunities to develop advanced devices in the fields of water remediation, chemical micro-reactor, etc. Although conical structures can achieve a directional oil droplet motion, the continuous and adaptive fluid self-transport in complicated environments is still a challenge. Inspired by the distinctive oil transport capability of fishbone and the anisotropic grooved structure of rice leaves, this work presents a multi-bioinspired grooved conical spine (BGCS) for improved oil manipulation. Benefiting from the cooperative effect of the asymmetric Laplace pressure and the surface capillary force, the BGCS possesses the reliable functions of ultrafast and continuous oil transport under water, in air, and even across the air–water interface. Compared with the original cone, the BGCS demonstrates a nine times faster transporting velocity and a five times larger capacity. It is envisioned that this updated oil-collecting cone with its cooperative structure should find real-world applications.
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MOLECULES
·
2022
·Vol. 27
·期 7
·2191
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IF 4.927
Yingbiao Xu,Yefei Wang,Tingyi Wang,Lingyu Zhang,Mingming Xu,Han Jia
Various nanoparticles have been applied as chemical demulsifiers to separate the crude-oil-in-water emulsion in the petroleum industry, including graphene oxide (GO). In this study, the Janus amphiphilic graphene oxide (JGO) was prepared by asymmetrical chemical modification on one side of the GO surface with n-octylamine. The JGO structure was verified by Fourier-transform infrared spectra (FTIR), transmission electron microscopy (TEM), and contact angle measurements. Compared with GO, JGO showed a superior ability to break the heavy oil-in-water emulsion with a demulsification efficiency reaching up to 98.25% at the optimal concentration (40 mg/L). The effects of pH and temperature on the JGO’s demulsification efficiency were also investigated. Based on the results of interfacial dilatational rheology measurement and molecular dynamic simulation, it was speculated that the intensive interaction between JGO and asphaltenes should be responsible for the excellent demulsification performance of JGO. This work not only provided a potential high-performance demulsifier for the separation of crude-oil-in-water emulsion, but also proposed novel insights to the mechanism of GO-based demulsifiers.Keywords:heavy oil-in-water emulsion;demulsification;Janus graphene oxide;molecular dynamic simulation
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Wenwen Wang,Yutang Kang,Canyu Cui,Xinyan Lv,Zisheng Wang,Boran Wang,Yumei Tan,Shihui Jiao,Guangsheng Pang
A hierarchical micro/nanostructure has been successfully fabricated, which is constructed by anchoring polyethersulfone (PES) nanoparticles on Zn-Ni-Co layered double hydroxide (LDH) nanowires with stainless steel mesh as supporter (PES/PDA@ZNCNW-SSM). The PES/PDA@ZNCNW-SSM shows excellent underliquid dual superlyophobicity with underwater tetrachloroethylene contact angle and under n-hexane water contact angle of 166.7° and 166.8°, respectively. The underliquid dual lyophobic PES and microporous structure formed by Zn-Ni-Co LDH nanowires synergistically contribute to the underliquid dual superlyophobic surface, which is beneficial for effective and controllable organic liquid/water separation. After 10 cycles of alternate separation, the separation efficiencies of PES/PDA@ZNCNW-SSM are above 99.9% and 99.4% for water-in-tetrachloroethylene and tetrachloroethylene-in-water emulsions, respectively. The underliquid dual superlyophobicity can also be obtained with carbon cloth, non-woven fabric, Ni foam and filter paper as supporter and the corresponding membranes can be used to efficiently separate organic liquid/water mixtures on-demand. These results confirm that the hierarchical micro/nanostructure anchored with underliquid dual lyophobic PES nanoparticles is an effective route for the preparation of underliquid dual superlyophobic materials.
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危险品化学品经营许可证（带存储）