Fabrication of super-hydrophobic filter paper via mixed wax phase separation for efficient oil/water separation

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 5794-5805
Author(s):  
Yating Wang ◽  
Xiaochun Chen ◽  
Yaqi Liang ◽  
Chenghua Yu
Keyword(s):  
Filter Paper ◽  
Surface Composition ◽  
Low Cost ◽  
Sliding Angle ◽  
Coated Paper ◽  
Water Contact ◽  
Water Separation ◽  
Oil Separation ◽  
Paper Surface ◽  
Superhydrophobic Paper

Despite previous efforts, the fabrication of superhydrophobic substrate via an environment friendly and easy approach remains a great challenge. In this study, a low cost, simple, and green procedure was developed to prepare a superhydrophobic paper surface that is acceptable for the papermaking industry. First, a wax mixture (beeswax & carnauba wax) was emulsified and coated on the filter paper surface. Then, the coated paper was annealed at different temperatures. The further heat-treatment-rendered wax-coated paper hydrophobic or superhydrophobic because submicrometer or micrometer wax structures were present on the paper surface. The water contact angle of the annealed filter paper sample reached 151.5° at 60 °C, and the sliding angle was under 10°. Further, the relationship between surface composition and the hydrophobic properties of the coated paper samples was discussed. The obtained paper samples showed great potential in water/oil separation, as they had an efficiency over 99%. This work proposed a new simple and mild approach to fabricate superhydrophobic filter papers and explored the hydrophobicity and water/oil separation properties.

Hydrophobic and Oleophilic Filter Paper for Oil/Water Separation

2019 ◽  
Vol 798 ◽  
pp. 385-390
Author(s):  
Sunisa Jindasuwan ◽  
Sitthisuntorn Supothina
Keyword(s):  
Contact Angle ◽  
Free Energy ◽  
Surface Free Energy ◽  
Water Contact Angle ◽  
Filter Paper ◽  
Diesel Oil ◽  
Selective Removal ◽  
Water Contact ◽  
Water Separation ◽  
Filter Papers

The separation of oil from water is significance for environmental de-pollution application. To obtain selectivity of liquid, filter papers were coated to bear highly hydrophobic and oleophilic functionality that can allow only oils to pass through them. The coating solutions were prepared by mixing poly(methylhydro siloxane, PMHS) and fumed silica at various proportions. To determine an optimum coating condition, properties of the treated filter papers were investigated by measuring water contact angle and surface free energy, examining surface morphology and testing for selective removal of diesel oil from water. The optimum coating solution was at the PMHS:fumed silica weight ratio of 1.25:1.00. The treated filter paper exhibited high hydrophobicity with water contact angle of 142.80 ± 0.36 degrees and surface free energy of 0.78 mJ/m2. In addition, it exhibited high selective removal of diesel oil from water with oil absorption capacity of 2.3 g/g.

scholarly journals A Robust Superhydrophobic Polyurethane Sponge Loaded with Multi-Walled Carbon Nanotubes for Efficient and Selective Oil-Water Separation

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3344
Author(s):  
De Liu ◽  
Shiying Wang ◽  
Tao Wu ◽  
Yujiang Li
Keyword(s):  
Ionic Strength ◽  
Absorptive Capacity ◽  
Large Scale ◽  
Low Cost ◽  
Absorption Capacity ◽  
Effect Of Temperature ◽  
Water Contact ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water

The influence of different coupling agents and coupling times on the wettability of a polyurethane (PU) sponge surface were optimized. Octadecyltrichlorosilane (OTS) was selected as the optimal coupling agent to prepare the superhydrophobic sponge. The superhydrophobic sponge was prepared in one step, which has the advantages of simple operation and enhanced durability. The superhydrophobic sponge was characterized by scanning electron microscopy, Teclis Tracker tensiometry, and Fourier transform infrared (FT-IR) spectrophotometry. The water contact angle increased from 64.1° to 151.3°, exhibiting ideal superhydrophobicity. Oils and organic solvents with different viscosities and densities can be rapidly and selectively absorbed by superhydrophobic sponges, with an absorption capacity of 14.99 to 86.53 times the weight of the sponge itself, without absorbing any water. Since temperature affects the viscosity and ionic strength of oil, and influences the surface wettability of the sponges, the effect of temperature and ionic strength on the oil absorption capacity of the superhydrophobic sponges was measured, and its mechanism was elucidated. The results showed that the absorptive capacity retained more than 90% of the initial absorptive capacity after repeated use for 10 times. Low-cost, durable superhydrophobic sponges show great potential for large-scale oil-water separation.

scholarly journals Facile Approach to Develop Hierarchical Roughness fiber@SiO2 Blocks for Superhydrophobic Paper

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1393 ◽  
Author(s):  
Qing Wang ◽  
Jieyi Xiong ◽  
Guangxue Chen ◽  
Ouyang Xinping ◽  
Zhaohui Yu ◽  
...  
Keyword(s):  
Large Scale ◽  
Low Cost ◽  
Sol Gel ◽  
Sio2 Nanoparticles ◽  
Contact Angles ◽  
Preparation Process ◽  
Water Contact ◽  
Mechanical Durability ◽  
Complex Preparation ◽  
Superhydrophobic Paper

Papers with nanoscaled surface roughness and hydrophobically modification have been widely used in daily life. However, the relatively complex preparation process, high costs and harmful compounds have largely limited their applications. This research aims to fabricate superhydrophobic papers with low cost and nontoxic materials. The surface of cellulose fibers was initially coated with a film of SiO2 nanoparticles via sol-gel process. After papermaking and subsequent modification with hexadecyltrimethoxysilane through a simple solution-immersion process, the paper showed excellent superhydrophobic properties, with water contact angles (WCA) larger than 150°. Moreover, the prepared paper also showed superior mechanical durability against 10 times of deformation. The whole preparation process was carried out in a mild environment, with no intricate instruments or toxic chemicals, which has the potential of large-scale industrial production and application.

East Asian Calligraphy Black Ink-Coated Paper as Flexible Conducting Electrode for Supercapacitor

2021 ◽  
Author(s):  
Ren-Jie Xie ◽  
I-Chun Cheng ◽  
Jian-Zhang Chen
Keyword(s):  
Flexible Electronics ◽  
Photoelectron Spectroscopy ◽  
Low Cost ◽  
East Asian ◽  
Electrical Conductance ◽  
Angle Measurement ◽  
Bending Test ◽  
Coated Paper ◽  
Water Contact ◽  
X Ray

Abstract East Asian calligraphy black ink (hereafter called simply “black ink”) is used to fabricate flexible conducting chromatography paper electrode by a simple and low-cost method. The black ink-coated paper was characterized by scanning electron microscopy, surface profiler, water contact angle measurement, electrical resistance measurement, X-ray photoelectron spectroscopy, and X-ray diffraction. The hydrophilicity slightly decreased after black ink coating but still provided good adhesion to the follow-up reduced graphene oxide/polyaniline/chitosan slurry coating for fabricating supercapacitor electrodes. A 1000-cycle repeated bending test with a bending radius of 5 mm revealed good conductance retention. Instrumental analyses indicated that the carbon black in the black ink was the main contributor to the electrical conductance. The supercapacitor with black-ink-coated paper electrodes exhibited an areal specific capacitance of up to 179.08 mF/cm² and coulomb efficiency of 80%. This confirmed that the black-ink-coated paper electrode could be feasibly applied to a supercapacitor. This black-ink-coated paper can be easily fabricated in resource-limited settings, and it provides new possibilities for the use of paper-based electrodes in flexible electronics.

Micro–nano structural engineering of filter paper surface for high selective oil–water separation

Cellulose ◽  
2017 ◽  
Vol 24 (7) ◽  
pp. 2913-2924 ◽  
Author(s):  
Fang Zhang ◽  
Hao Ren ◽  
Lingling Shen ◽  
Guolin Tong ◽  
Yulin Deng
Keyword(s):  
Filter Paper ◽  
Structural Engineering ◽  
Water Separation ◽  
Paper Surface ◽  
Oil Water Separation ◽  
Oil Water

Facile fabrication of superhydrophobic filter paper with improved durability and water repellency

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Lizheng Sha ◽  
Chao Ma ◽  
Huifang Zhao ◽  
Supeng Qiu ◽  
Zhongyu Yan ◽  
...  
Keyword(s):  
Filter Paper ◽  
Separation Efficiency ◽  
Cellulose Nanofibrils ◽  
Water Repellency ◽  
Step Method ◽  
Water Contact ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water ◽  
Self Cleaning

Abstract Superhydrophobic surfaces have high potential in self-cleaning and oil-water separation applications. We developed a three-step method for the preparation of superhydrophobic filter paper. It involved citric acid (CA) pretreatment to activate cellulose fibers, coating with cellulose nanofibrils/functionalized silica (CNFs/m-SiO2) slurry to increase surface roughness, and grafting of hexadecyltrimethoxysilane (HDTMS) to enhance water resistance. The water contact angle (WCA) and siding angle (SA) of the prepared filter paper reached 151.5° and 7.5°, respectively. The results showed that, compared to the coated filter paper without the added CNFs, the coated paper with CNFs had higher retention of m-SiO2, thus roughness required for superhydrophobic surface was achieved. Further test under frequent abrasion and acid or alkali conditions showed that CA pretreatment improved the durability of superhydrophobic filter paper due to chemical crosslinking between the modified substrate and m-SiO2. Besides, the prepared superhydrophobic filter paper had outstanding self-cleaning property and high oil-water separation efficiency for various oil-water mixtures. Therefore, it is expected to be used for the treatment of oily wastewater.

scholarly journals Superhydrophobic paper with mussel-inspired polydimethylsiloxane–silica nanoparticle coatings for effective oil/water separation

RSC Advances ◽  
2020 ◽  
Vol 10 (14) ◽  
pp. 8008-8015 ◽  
Author(s):  
Xuewei Ruan ◽  
Tiancheng Xu ◽  
Dingjiang Chen ◽  
Ziwen Ruan ◽  
Haitu Hu
Keyword(s):  
Low Cost ◽  
Silica Nanoparticle ◽  
Water Separation ◽  
Wetting Properties ◽  
Oil Water Separation ◽  
Oil Water ◽  
Nanoparticle Coatings ◽  
Superhydrophobic Paper

Although various filtration materials with (super)wetting properties have been fabricated for effective oil/water separation, eco-friendly and low-cost materials are still highly desired.

scholarly journals Facile Fabrication of Superhydrophobic Copper- Foam and Electrospinning Polystyrene Fiber for Combinational Oil–Water Separation

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 97 ◽  
Author(s):  
Yu-Ping Zhang ◽  
Jing-Hua Yang ◽  
Ling-Li Li ◽  
Cheng-Xing Cui ◽  
Ying Li ◽  
...  
Keyword(s):  
Interaction Mechanism ◽  
Lone Pair ◽  
Absorption Capacity ◽  
Oil Absorption ◽  
Sliding Angle ◽  
Water Contact ◽  
Water Separation ◽  
Copper Foam ◽  
Oil Water Separation ◽  
Oil Water

Membrane-based metal substrates with special surface wettability have been applied widely for oil/water separation. In this work, a series of copper foams with superhydrophobicity and superoleophilicity were chemically etched using 10 mg mL−1 FeCl3/HCl solution with consequent ultrasonication, followed by the subsequent modification of four sulfhydryl compounds. A water contact angle of 158° and a sliding angle lower than 5° were achieved for the copper foam modified using 10 mM n-octadecanethiol solution in ethanol. In addition, the interaction mechanism was initially investigated, indicating the coordination between copper atoms with vacant orbital and sulfur atoms with lone pair electrons. In addition, the polymeric fibers were electrospun through the dissolution of polystyrene in a good solvent of chlorobenzene, and a nonsolvent of dimethyl sulfoxide. Oil absorption and collection over the water surface were carried out by the miniature boat made out of copper foam, a string bag of as-spun PS fibers with high oil absorption capacity, or the porous boat embedded with the as-spun fibers, respectively. The findings might provide a simple and practical combinational method for the solution of oil spill.

scholarly journals Fabrication of Green Superhydrophobic/Superoleophilic Wood Flour for Efficient Oil Separation from Water

Processes ◽  
2019 ◽  
Vol 7 (7) ◽  
pp. 414 ◽  
Author(s):  
Xuefei Tan ◽  
Deli Zang ◽  
Haiqun Qi ◽  
Feng Liu ◽  
Guoliang Cao ◽  
...  
Keyword(s):  
Contact Angle ◽  
Wood Flour ◽  
Synthesis Method ◽  
Fiber Surface ◽  
Engine Oil ◽  
Maximum Adsorption Capacity ◽  
Potential Candidate ◽  
Water Contact ◽  
Water Separation ◽  
Oil Separation

The removal of oil from waste water is gaining increasing attention. In this study, a novel synthesis method of green superhydrophobic/superoleophilic wood flour is proposed using the deposition of nano–zinc oxide (nZnO) aggregated on the fiber surface and the subsequent hydrophobic modification of octadecanoic acid. The as-prepared wood flour displayed great superhydrophobicity and synchronous superoleophilicity properties with the water contact angle (WCA) of 156° and oil contact angle (OCA) of 0° for diesel oil. Furthermore, the as-prepared wood flour possessed an excellent stability, probably due to the strong adhesion of nZnO, which aggregates to the fiber surface of wood flour with the action of glutinous polystyrene. The maximum adsorption capacity of as-prepared wood flour was 20.81 g/g for engine oil, which showed that the as-prepared wood flour is a potential candidate as an efficient oil adsorbent in the field of water-oil separation. Moreover, it has good chemical steadiness and environmental durability. Taken together, all the information acquired from this research could be valuable in evaluating the potential of as-prepared wood flour as a competitive and sustainable oil-water separation material.

scholarly journals Stable and Durable Conductive Superhydrophobic Coatings Prepared by Double-Layer Spray Coating Method

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1506
Author(s):  
Xiang Liu ◽  
Kai Chen ◽  
Dekun Zhang ◽  
Zhiguang Guo
Keyword(s):  
Composite Coating ◽  
Double Layer ◽  
Low Cost ◽  
Spray Coating ◽  
Sliding Angle ◽  
Water Contact ◽  
Superhydrophobic Coatings ◽  
Coating Method ◽  
Specialty Fields ◽  
Application Fields

Herein, a low cost, durable, and stable conductive superhydrophobic composite coating (CSC coating) was fabricated on a Q345 steel surface by simple double-layer spray coating. The water contact angle (WCA) of the CSC coating was 160° and the sliding angle (SA) was 3°. In addition to its excellent conductivity (3.10 × 103 Ω), the fabricated composite coating had good durability and wear resistance. After 10 sand-washing cycles, the CSC coating surface still exhibited stable superhydrophobicity (149° WCA, 9.5° SA). At 200 g pressure, the surface of the optimized CSC coating still maintained fine superhydrophobicity (150° WCA, 9.2° SA) and conductivity (1.86 × 104 Ω) after 10 abrasion cycles. In addition, it also exhibited fine adhesion (0.307 MPa) between the composite coating and the substrate. This functional superhydrophobic surface can be applied in specialty fields with harsh conditions such as coal mining and petrochemical activities. This new coating may also expand the application fields of superhydrophobic surfaces and have broad practical application prospects.

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