A mesh membrane coated with dual-scale superhydrophobic nano zinc oxide: Efficient oil-water separation

Velayi, Elmira; Norouzbeigi, Reza

doi:10.1016/j.surfcoat.2020.125394

Cited by 46 publications

(17 citation statements)

References 65 publications

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“…63 Two-step chemical bath deposition of ZnO micro-/nanohierarchical structures can be used as another option for a stainless steel mesh to become superhydrophobic/superoleophilic for oil/water separation (99.9% efficiency) avoiding low surface energy materials. 64 ZnO nanowires on a stainless steel mesh can be selectively switched between two modesoil-removing and waterremoving (Figure 9)by chemical treatment or annealing. The switchable wettability can be realized by treating the ZnO nanowire-coated mesh with stearic acid or NaOH.…”

Section: Zno Surface Wettability Manipulation Bymentioning

confidence: 99%

“…As deposited, the mesh is superhydrophilic in air and superoleophobic in water and lets water permeate through . Two-step chemical bath deposition of ZnO micro-/nanohierarchical structures can be used as another option for a stainless steel mesh to become superhydrophobic/superoleophilic for oil/water separation (99.9% efficiency) avoiding low surface energy materials …”

Section: Superhydrophobic Zno Nanowire Applicationsmentioning

confidence: 99%

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Superhydrophobic ZnO Nanowires: Wettability Mechanisms and Functional Applications

Mardosaitė

Jurkevičiūtė

Račkauskas

2021

Crystal Growth & Design

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Superhydrophobic surfaces are important parts of many applications in cleaning and protective coatings. Such surfaces can be realized by controlling the surface chemistry and nanoscale structure. Elongated ZnO nanostructures, called nanowires, are often used in superhydrophobic applications due to their intrinsic characteristic advantages and simple synthesis control. This review presents a critical overview of the latest research activities focused on the ZnO nanowire superhydrophobic surfaces. A wettability mechanism background is introduced with the overlay of the crystal structure fundamentals adapted for ZnO nanowires to gain insights into the multifunction application of superhydrophobic ZnO nanowires. Moreover, the latest achievements in application of ZnO superhydrophobic nanowires or reversible wettability for self-cleaning, separation, antifogging, antibacterial, and other applications are outlined. Finally, a brief outlook on the issues and emerging perspectives of ZnO nanowire wettability research is summarized.

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Section: Zno Surface Wettability Manipulation Bymentioning

confidence: 99%

Section: Superhydrophobic Zno Nanowire Applicationsmentioning

confidence: 99%

Superhydrophobic ZnO Nanowires: Wettability Mechanisms and Functional Applications

Mardosaitė

Jurkevičiūtė

Račkauskas

2021

Crystal Growth & Design

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“…Finally, the signal measured by the sensor is transmitted via a cable to an evaluation unit (electronic evaluation system). However, since corrosion of lubricants increases with water content and oxidation [ 206 ], this detection tool is only a rough estimate of the water content in the lubricant by optical measurements and has limited usability. In addition, airborne debris can cause incorrect measurements, and the depth of the sensor can also affect the results.…”

Section: Research On Bearings Lubrication Technology Of Wind Turbinementioning

confidence: 99%

Review of Tribological Failure Analysis and Lubrication Technology Research of Wind Power Bearings

et al. 2022

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Wind power, being a recyclable and renewable resource, makes for a sizable portion of the new energy generation sector. Nonetheless, the wind energy industry is experiencing early failure of important components of wind turbines, with the majority of these issues also involving wind power bearings. Bearing dependability is directly tied to the transmission efficiency and work performance of wind turbines as one of its major components. The majority of wind turbine failures are due to bearings, and the vast majority of bearing failures are due to lubrication. The topic of improving the accuracy and life of wind power bearing motion is becoming increasingly essential as the wind power industry develops rapidly. This study examines the various constructions and types of wind turbines, as well as their bearings. We also examined the most typical causes of friction and lubrication failure. Furthermore, contemporary research on wind turbine bearings has been compiled, which mostly comprises the study and development of lubrication technology and other areas. Finally, a conclusion and outlook on current challenges, as well as future research directions, are offered.

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“…Membrane selectivity is significant in evaluating its performance as it shows oil rejection reached, indicating permeate and concentrate quality according to the role played by this membrane. In oily water separation using the membrane, the membrane selectivity is denoted by its oil rejection percent (O r ) and calculated by dividing the subtraction of oil concentrations in both feeds (O f ) and treated permeate (O p ) sides over the oil feed concentration, Equation (3).…”

Section: Selection Degree (Oil Rejection)mentioning

confidence: 99%

“…[2] Aims for oil recovery from a product or a spinoff are economic gains or removing the oil phase for water reuse or environmentally friendly disposal and safe discharge. [3] The oil present in these effluents can be as textile, tanneries, machining, and metals processing. [13] Oily water as emulsions harm water basins unless treated continuously, causes economic losses, mislaying oil resources due to lack of recovery.…”

Section: Introductionmentioning

confidence: 99%

Recent Aspects in Membrane Separation for Oil/Water Emulsion

Shalaby

Sołowski

Abbas

2021

Adv Materials Inter

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found with other insoluble matter, presenting relevant problems with safe and convenient separation. The legal discharge of oil-water emulsions is a complex process. [4] Thus, environmental authorities have established stringent regulations to cope with it. [5] Depending on countries, the oil limits are concentrations below 40 ppm as in Vietnam, [6] and in other countries like Korea, the maximum is only five ppm of oil in discharge. [7] Generally, the oil phase in water has three forms, based on oil droplets, size of more than 150 micrometers is called free oil, but that size found from 50 to 150 micrometers is the dispersed oil, [8] finally, the emulsified oil less than 20 µm. There is an increasing interest in employing membrane technology for filtering smaller size oil droplets. In this review, oil-water emulsion problems are highlighted with oil-water separation techniques selection and their performance with varied oil concentration and composition of other immiscible or miscible components. [9] Membrane technology is known formerly to economically advantageous for oily wastewater (OWW) treatment compared with other conventional technologies. [9] Based on the literature, the membranebased treatment cost estimation was about 1 and 3 $ m −3 , [10] lower than for dissolved air floatation (DAF) treatment (cost was 3.65 $ m −3 ). Generally, the treatment cost depends on OWW sources, as each industry has its specific blends for oil and grease jointly with other membrane foulants. [11] For example, oil-water emulsions treatment from the fatty acid industry has a total capital cost (costs of membranes, electricity, labor, cleaning, and maintenance) of 2.65 $ m −3 , compared with the railroad industry (it was ranged from 1.03 to 1.48 $ m −3 ). These costs for the metalworking OWW using UF were 2.8 $ m −3 . In microfiltration (MF) membrane, the OWW membrane-based treatment for oil concentration of 50 ppm annual cost was estimated as 0.098 $ m −3 with a feed rate of 100 m 3 day −1 . [9] The cost of membrane-based treatment of OWW is generally varying but is lower than conventional technologies. [12] 1.1. Oil-Water Emulsions Sources, Environmental Hazard, and Discharge Limits An oil-water emulsion is either a waste stream product, or secondary product. These effluents are generated from different areas and industrial sectors like the petroleum& gas sector, food processing, shipping facilities and maritime, and many others Oily wastewater is generated by various industries in extraordinary growing volumes, such as oil refineries, petrochemicals, metallurgical, food & beverages, and dairy industries, which need oil removal for safe discharge to the environment. Lower cost of production with high oil removal and efficient performance compared to classical methods for treating oil-water emulsions attributed to the alleviation of operation. That emphasizes membrane modification to enhance wettability, hydrophilicity with the antifouling property such as membranes dealing with tiny oil emulsions to be the key parameters to im...

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A mesh membrane coated with dual-scale superhydrophobic nano zinc oxide: Efficient oil-water separation

Cited by 46 publications

References 65 publications

Superhydrophobic ZnO Nanowires: Wettability Mechanisms and Functional Applications

Superhydrophobic ZnO Nanowires: Wettability Mechanisms and Functional Applications

Review of Tribological Failure Analysis and Lubrication Technology Research of Wind Power Bearings

Recent Aspects in Membrane Separation for Oil/Water Emulsion

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