Gels
·
2023
·Vol. 9
·期 5
·405
·
IF 4.6
Feng Liu,Xin Di,Xiaohan Sun,Xin Wang,Tinghan Yang,Meng Wang,Jian Li,Chengyu Wang,Yudong Li
The persistent challenge of removing viscous oil on water surfaces continues to pose a major concern and requires immediate attention. Here, a novel solution has been introduced in the form of a superhydrophobic/superoleophilic PDMS/SiO2aerogel fabric gathering device (SFGD). The SFGD is based on the adhesive and kinematic viscosity properties of oil, enabling self-driven collection of floating oil on the water surface. The SFGD is able to spontaneously capture the floating oil, selectively filter it, and sustainably collect it into its porous fabric interior through the synergistic effects of surface tension, gravity, and liquid pressure. This eliminates the need for auxiliary operations such as pumping, pouring, or squeezing. The SFGD demonstrates exceptional average recovery efficiencies of 94% for oils with viscosities ranging from 10 to 1000 mPa·s at room temperature, including dimethylsilicone oil, soybean oil, and machine oil. With its facile design, ease of fabrication, high recovery efficiency, excellent reclaiming capabilities, and scalability for multiple oil mixtures, the SFGD represents a significant advancement in the separation of immiscible oil/water mixtures of various viscosities and brings the separation process one step closer to practical application.
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
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xiaochen Li,Zihao Yang,Ying Peng,Fengfan Zhang,Meiqin Lin,Juan Zhang,Qichao Lv,Zhaoxia Dong
Efficient micron-sized droplet separation materials have become a new demand for environmental protection and economic development. However, existing separation methods are difficult to be effectively used for micron-sized water droplets surrounded by viscous oil, and common materials have difficulty maintaining hydrophilicity underoil. Here, inspired by the microstructure of tree xylem, we report a cellulose–polyurethane sponge (CP-Sponge) with wood-like pores and underoil superhydrophilicity using directional freeze-casting. The CP-Sponge has an excellent selective water absorption capacity underoil and compression resilience. This preparation strategy can flexibly control the sponge’s dimensional morphology. The designed cylindrical CP-Sponge can be easily installed in the silicone tube of a peristaltic pump. During pump operation, with a simple absorption, compression, and recovery process, the CP-Sponge continuously and effectively removes micron-sized water from crude oil and lubricating oil, reducing residual water in the oil to less than 2 ppm. The absorption-saturated sponge can be dried to continue recycling. Eco-friendly, recyclable, and sustainable artificial porous sponges provide new ideas and inspiration for the practical application of deep dehydration of viscous oils.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Hu Lin,Yajie Ding,Jianqiang Wang,Shenghua Zhou,Haibo Lin,Qiu Han,Jiawei Wang,Yong Zhou,Fu Liu
Concurrent oil and water recovery from emulsions present a great challenge to membrane-based separation techniques. In this study, we invent a novel nanofibrous hollow membrane extraction technology to recover oil and water from oily emulsions for the first time. The nanofibrous poly(vinylidene fluoride) (PVDF) hollow fiber contactor was capable of continuously extracting oil assisted by hexane. A massive cumulative oil flux (up to 2.3 × 10 4 g/m 2 ) was obtained in the continuous extraction of 200 h. High value and viscous lubricant oil were recovered with a purity of 99.90 ± 0.03 %, and total organic carbon of the feed solution was reduced by more than 70 %. Density functional theory (DFT) calculations were carried out to evaluate binding energies between oil molecules, PVDF materials and extractants, indicating the emulsification, convalesce and transfer process. The proposed hollow membrane extraction strategy offers a promising way to achieve viscous oil recovery and water purification simultaneously.
研究领域:
环境工程
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Wanshun Deng,Gang Wang,Lei Tang,Zhixiang Zeng,Tianhui Ren,Qunji Xue
Viscous oil adherence onto solid surfaces is ubiquitous and has caused intractable fouling problems, impairing the function of solid surfaces in various areas such as optics and separation membranes. Materials with superhydrophilicity and underwater superoleophobicity are very effective in elimination of oil fouling. However, most of them cannot dewet viscous oils and may malfunction without prehydration treatment. Herein, we report a facile and environmental strategy to prepare barium sulfate (BaSO4) nanocoating to dewet viscous oils on dry surfaces. Abundant surface polar groups (surface hydroxyl) on BaSO4 nanocoating enhance both hydrophilicity after oil fouling (underoil water contact angle <10°) and underwater superoleophobicity (underwater–oil contact angle >155°) and then facilitate oil dewetting ability. Different oils with viscosity up to 900 mPa·s can be easily eliminated after immersion into water. The results and force analysis also demonstrate that small surface roughness and ultrahydrophilicity under oil are beneficial to achieve oil dewetting property on dry surfaces. Furthermore, BaSO4 nanocoating displays excellent mechanical, thermal and chemical stability and can maintain oil repellency through various harsh conditions. Outstanding antioil fouling ability also enables the fabric coated by BaSO4 nanocoating to separate crude oil/water with flux higher than 28 000 Lm2–h–1 and separation efficiency larger than 99.9% and maintain effective separation performance even after 100 times of separation. Thus, the robust superhydrophilic BaSO4 nanocoating is potential in oil dewetting and waste oil remediation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Mengmeng Liu,Jianqiang Wang,Yajie Ding,Yong Zhou,Fu Liu
Viscous oil separation and its highly efficient recovery is a great challenge in oil/water separation applications. Membrane separation was considered as a prospective strategy for oil/water separation, but membrane contamination caused by the oil droplets restricted its applications significantly. We here propose a nondispersive solvent extraction strategy to efficiently recover viscous lubricant oil from emulsions via a polydopamine modified PVDF Janus membrane . The incorporated thin polydopamine layer facilitates the adsorption and diffusion of surfactant stabilized oil droplets through the membrane. We studied the influence of polydopamine coating time, the flow rate on both feed and extraction sides, the weight content of lubricant oil on the recovery of oil. The optimized membrane exhibited a 10 h accumulative flux (1595 g·m −2 ) for viscous lubricant oil in water emulsion, which was 70 % higher than the contrast PVDF membrane. The current study might significantly advance application of this novel method for highly efficient separation and recovery of viscous oils from oil/water mixtures.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Jinxuan Meng,Jin Zhang,Xiang Shen,Jia Xie,Qianyuan Liao,Fang He,Jianguo Zhao,Zhenxing Wang
Oil-fouling is a troublesome problem for membrane separating viscous oil-in-water emulsions. Nano-structured hydrogel is a superhydrophilic material showing a superior anti-oil fouling property, but the current modification strategies for constructing nano-structured hydrogels on membranes are limited by the complex manipulation and poor universality. In this work, inspired by the stickiness of ovalbumin (OVA) and the versatility of tannic acid (TA), we designed a green, facile and universal strategy for constructing nano-structured hydrogel on various hydrophobic membranes for separating viscous oil-in-water emulsion. Thanks to the distinct adhesion property and reactivity of OVA and TA, cumbersome surface activation process is avoided. What’s more, abundant nano-structure can be generated in-situ during the formation of hydrogel, without adding extra nanomaterials. Compared to the hydrogel without nano-structure, the nano-structured hydrogel can keep un-fouling even the surface was pressed by crude oil for 23 h, demonstrating that the in-situ nano-structure can endow the membrane with excellent anti-crude oil-fouling performance. The resulted membrane not only shows a high efficiency for separating surfactant-stabilized crude oil-in-water emulsion with average flux of 2198 L m −2 h −1 bar −1 and crude oil rejection rate of 99.8%, but also shows excellent resistance to water flushing, acid and alkali, and long-time stability in air. Notably, this strategy can construct nano-structured hydrogel on various hydrophobic membranes easily. Considering the simplicity and universality, this strategy has the potential to be a powerful tool for preparing separation membranes with super-anti-high-viscosity oil contamination property and accelerate the rapid development of membrane in separating viscous oil-in-water emulsions.
研究领域:
材料科学
·
环境工程
·
界面化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yunlu Pan,Pengcheng Wei,Feiran Li,Liming Liu,Xuezeng Zhao
Sustainable methods for oil–water separation are highly desirable for industries globally as their significant role in various applications, such as the treatments for industrial wastewater or marine oil leakage, which harms the environment and ecology deeply. However, existing super-hydrophobic/super-oleophilic and super-oleophobic/super-hydrophilic surfaces fail to satisfy the requirement of continuous oil–water separation owing to either affinity to viscous oil or poor water resistance. Novel methods available for sustainable oil–water separation are widely desired. Until now, there has been no research conducted on the application of super-omniphobic meshes for oil–water separation. Herein, a liquid-assisted strategy for dual-purpose oil–water separation with super-omniphobic meshes was proposed. The strategy can be applied for oil–water separation by removing either water or oil with high separation efficiency. Meanwhile, by taking advantage of the anti-liquid property of the super-omniphobic mesh, the existing common problems such as viscous oil contamination and caustic aqueous corrosion could be avoided. Moreover, since this strategy adopts super-omniphobic meshes, oil–water separation using this strategy in a harsh environment can also be guaranteed. Compared with the conventional super-wetting meshes for oil–water separation, the strategy proposed in this work ensures that the separation mesh always maintains super-oleophobicity during the oil–water separation process and is universally applicable to a variety of super-omniphobic meshes. The present novel strategy provides a general guide for dual-purpose oil–water separation and a sustainable method for anti-contamination wastewater treatment, which indicates promising applications.
研究领域:
环境工程
·
材料科学
·
化学工程
·
可持续发展
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Huanhuan Dong,Xiaoyu Ji,Zhao Li,Junxiang Guo,Shan Peng
Viscous oil spills (e.g., petroleum and diesel) in marine environments and domestic oily wastewater pose seriously ecological and public health risks owing to their high viscosity and poor fluidity, making the remediation a very urgent challenge. To address these issues, we designed an inherently hydrophobic MXene/hollow CuCo-MOF (H-CuCo-MOF)@PDMS sponge featuring an instantly photothermal response and a multiscale wrinkled structure. The confined effects of H-CuCo-MOF and MXene synergistically generate an efficient electron transport network, where interfacial charge transfer enhances carrier lifetime, thereby prolonging photothermal conversion efficiency. In Addition, the high specific surface area of H-CuCo-MOF and the layered structure of MXene increase confined adsorption sites while preventing MOF aggregation. Stress mismatch between flexible PDMS and rigid MXene form a highly wrinkled architecture, effectively mitigating MXene stacking. Under 1-sun irradiation, the sponge’s surface temperature quickly reaches ∼80 °C within 20 s, altering surface tension and inducing the Marangoni effect to accelerate oil absorption. Moreover, taking advantages of high match between the coated sponge and the viscous oil, the separation efficiencies are exceeding 95 % for diesel oil and rapeseed oil, and 82.7 % for crude oil. The material also proves superior durability, maintaining stable hydrophobicity after 150 friction cycles, exceptional mechanical recovery (99.2 % after 10 compressions), and notable salt resistance and antibacterial properties.
研究领域:
环境科学
·
材料工程
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2023
·
IF 17.1
Yuankai Jin,Xiaonan Liu,Wanghuai Xu,Pengcheng Sun,Siping Huang,Siyan Yang,Xiao Yang,Qinggong Wang,Raymond H. W. Lam,Ruirui Li,Zuankai Wang
Taxis is an instinctive behavior of living organisms to external dangers or benefits. Here, we report a taxis-like behavior associated with liquid droplets on charged substrates in response to the external stimuli, referred to as droplet electrotaxis. Such droplet electrotaxis enables us to use either solid or liquid (such as water) matter, even a human finger, as stimuli to spatiotemporal precisely manipulate the liquid droplets of various physicochemical properties, including water, ethanol with low surface tension, viscous oil, and so on. Droplet electrotaxis also features a flexible configuration that even can manifest in the presence of an additional layer, such as the ceramic with a thickness of ∼10 mm. More importantly, superior to existing electricity-based strategies, droplet electrotaxis can harness the charges generated from diverse manners, including pyroelectricity, triboelectricity, piezoelectricity, and so on. These properties dramatically increase the application scenarios of droplet electrotaxis, such as cell labeling and droplet information recording.
研究领域:
微流控
·
软物质物理
·
智能材料
·
芯片实验室
·
界面科学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 48
·期 6
·2403-2415
·
IF 3.3
Yucheng Wu,Xueli Wen,Bihe Yuan
Fast and effective cleanup of viscous crude oil spills remains a global challenge. Herein, by coating the melamine sponge (MS) with a bio-based flame retardant, reduced graphene oxide (rGO) and carbon nanotubes (CNTs), we prepared a flame-retardant and photo/electrothermal conversion absorbent (rGO/CNTs/FRMS) for rapid oil/water separation. The multifunctional sponge demonstrates remarkable hydrophobicity (the water contact angle: 140.0°), high oil absorption capacity (48.2–114.9 g g−1) and recyclability (89.5% after 20 cycles). Notably, rGO/CNTs/FRMS exhibits excellent thermal stability, flame retardancy and photo/electrothermal conversion performance. Under 1 sun irradiation or 9 V, the surface temperatures of rGO/CNTs/FRMS rise to 98.8 °C or 123.2 °C within 60 s, respectively. The solar-assisted and Joule-heating rGO/CNTs/FRMS drastically reduces the viscosity of silicon oil, and thus saves absorption time by 29% under 1 sun or 47% under 9 V, respectively. The proposed all-weather oil absorbent design provides a sustainable and promising solution for crude oil spill clean-up.
研究领域:
环境科学
·
材料科学
·
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）