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 tha...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.展开更多
基金received fund through the CNR-ASRT(Italy-Egypt)2022-2023 international Exchanges(project ID:18775)the Science and Technology Development Fund(STDF),projects ID 41528 and 43224。
文摘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.
