A novel hydroxyapatite super-hydrophilic membrane for efficient separation of oil-water emulsions, desalting and removal of metal ions

Wang, Juan; Yu, Zongxue; Xiao, Xuehan; Chen, Zhiquan; Huang, Jiaqiang; Liu, Yucheng

doi:10.1016/j.desal.2023.116864

Cited by 15 publications

(2 citation statements)

References 74 publications

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“…It could be stated that the lower deposition amount of HMF-0.3 had a limited impact on pore sizes, with the pores in HMF-0.3 being larger than the size of the emulsion. Unlike the adsorption process, liquid droplets passed through the channel of HMF-0.3 quickly so it was hard for HMF-0.3 to hinder water droplets . Furthermore, HMF-0.6 was used for emulsion filtration with different surfactant contents.…”

Section: Resultsmentioning

confidence: 99%

Construction and Regulation of a Superhydrophobic Sponge via In Situ Anchoring of a Hyper-Cross-Linked Polymer for Efficient Oil/Water Separation

Xue,

Wang,

Man

et al. 2024

ACS Appl. Polym. Mater.

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In the ever-growing environmental concerns caused by crude oil spills and solvent discharges, our study pioneered an ingenious approach to fabricate superhydrophobic melamine formaldehyde (HMF) materials through in situ anchoring of a porous hyper-cross-linked polymer (HCP) and achieved stable integration of HCP on the MF surface by covalent bonds and hydrogen bonds instead of traditional adhesives. The resulting composite material exhibits exceptional performance with an oil adsorption capacity of 130 mL/g, a filtration/separation efficiency exceeding 99%, and remarkable environmental resistance and recyclability. The robust interfacial strength and high degree of cross-linking porous HCP facilitate tailorable design and easy adjustment of pore structures and ensure repeated use through simple squeezing. Notably, the hydrophobicity and porous structure of the sponge can be conveniently regulated by controlling the deposition amount of HCP, realizing a high adsorption capacity and/or efficient emulsion separation on demand. This study not only contributes to the advancement of wettability materials but also presents an efficient, versatile, and convenient method and toolbox to address diverse oil/water separation challenges, paving the way for sustainable environmental solutions and marking a significant stride toward a cleaner future.

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Section: Resultsmentioning

confidence: 99%

Construction and Regulation of a Superhydrophobic Sponge via In Situ Anchoring of a Hyper-Cross-Linked Polymer for Efficient Oil/Water Separation

Xue,

Wang,

Man

et al. 2024

ACS Appl. Polym. Mater.

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“…Therefore, the separation and enrichment of molybdenum and rhenium in the leaching solution of molybdenite after ammonia leaching treatment is the key to obtaining rhenium and molybdenum resources. Currently, there are many methods for separating rhenium and molybdenum from a leaching solution, such as solvent extraction [4,5], ion exchange [6][7][8], and membrane separation [9][10][11]. Due to its advantages in terms of easily operable equipment and high selectivity, solvent extraction technology [2,5,12] stands out as the most widely used tool for this application.…”

Section: Introductionmentioning

confidence: 99%

Efficient Separation of Re (VII) and Mo (VI) by Extraction Using E-1006–Ammonium Sulfate Aqueous Two-Phase System

Fan,

Li,

Dai

et al. 2024

Separations

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Aqueous two-phase extraction (APTE) stands out as an environmentally friendly technique for the separation of metal ions. The separation of Re (VII) and Mo (VI) in an aqueous solution was investigated using a novel aqueous two-phase system (ATPS) consisting of isodecanol polyoxyethylene ether (E-1006), ammonium sulfate, and water. A phase diagram of this system was developed, and the effects of pH, temperature, extraction time, the concentrations of E-1006 and (NH4)2SO4, and metal ions on the separation of Re (VII) and Mo (VI) were examined. The results show that at pH 7.0, Mo (VI) had almost transformed into the (NH4)2SO4-rich phase, while Re (VI) was extracted into the E-1006-rich phase. The increase in temperature induces a transition of Mo (VI) to the salt-rich phase, which is unfavorable for the extraction of Re (VII). The increase in the concentrations of E-1006 and (NH4)2SO4 has a positive effect on the separation of rhenium and molybdenum. Overall, the ATPS consisting of 200 g/L of E-1006, 200 g/L of (NH4)2SO4, and water yields an extraction efficiency of 97.2% for Re and a high separation factor of 2700 for Re (VII) and Mo (VI) from a mixture of 0.1 g/L of Re (VII) and 5 g/L of Mo (VI) at pH 7.0 and 323.15 K. Separation studies of the simulated leaching solution show that the extraction efficiency for Re (VI) is 99.1% and the separation factor of Re (VII) and Mo (VI) is 5100.

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Ultralong hydroxyapatite-based forward osmosis membrane for freshwater generation

Gomaa,

Abdel-Ghafar,

Galiano

et al. 2024

Front. Chem. Sci. Eng.

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Increasing global water shortages are accelerating the pace of membrane manufacturing, which generates many environmentally harmful solvents. Such challenges need a radical rethink of developing innovative membranes that can address freshwater production without generating environmentally harmful solvents. This work utilized the synthesized ultra-long hydroxyapatite (UHA) by the solvothermal method using the green solvent oleic acid in preparing UHA-based forward osmosis membranes. The membranes were developed using different loading ratios of graphene oxide (GO) by vacuum-assisted filtration technique. The prepared GO/UHA membranes were identified using X-ray diffraction, scanning electron microscope, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Water contact angle and pore size distribution were determined for the obtained GO/UHA membranes. The obtained hierarchical porous structure in the prepared membranes with interconnected channels results in a stable water flux with reverse salt flux. The best water flux rate of 42 ± 2 L·m−2·h−1 was achieved using the 50 mg GO/UHA membrane, which is 3.3 times higher than the pristine membrane, and a reverse salt flux of 67 g·m−2·h−1. The obtained results showed a promising capability of a new generation of sustainable inorganic-based membranes that can be utilized in freshwater generation by energy-efficient techniques such as forward osmosis.

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A novel hydroxyapatite super-hydrophilic membrane for efficient separation of oil-water emulsions, desalting and removal of metal ions

Cited by 15 publications

References 74 publications

Construction and Regulation of a Superhydrophobic Sponge via In Situ Anchoring of a Hyper-Cross-Linked Polymer for Efficient Oil/Water Separation

Construction and Regulation of a Superhydrophobic Sponge via In Situ Anchoring of a Hyper-Cross-Linked Polymer for Efficient Oil/Water Separation

Efficient Separation of Re (VII) and Mo (VI) by Extraction Using E-1006–Ammonium Sulfate Aqueous Two-Phase System

Ultralong hydroxyapatite-based forward osmosis membrane for freshwater generation

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