Ice Storage System with Oil-Water Mixture. 2nd Report. Discussion on Influence of Additive on Ice Formation Process.

A very low-density oil-absorbing hydrophobic material was fabricated from cellulose nanofiber aerogels–coated silane substances. Nanocellulose aerogels (NCA) superabsorbents were prepared by freeze drying cellulose nanofibril dispersions at 0.2%, 0.5%, 0.8%, 1.0%, and 1.5% w/w. The NCA were hydrophobically modified with methyltrimethoxysilane. The surface morphology and wettability were characterized by scanning electron microscopy and static contact angle. The aerogels displayed an ultralow density (2.0–16.7 mg·cm-3), high porosity (99.9%–98.9%), and superhydrophobicity as evidenced by the contact angle of ~150° that enabled the aerogels to effectively absorb oil from an oil/water mixture. The absorption capacities of hydrophobic nanocellulose aerogels for waste engine oil and olive oil could be up to 140 g·g-1 and 179.1 g·g-1, respectively.

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Fabrication of silica/PVA-co-PE nanofiber membrane for oil/water separation

Fashion and Textiles ◽

10.1186/s40691-021-00252-x ◽

2021 ◽

Vol 8 (1) ◽

Author(s):

Yuanli Chen ◽

Hui Fan ◽

Xinlin Zha ◽

Wenwen Wang ◽

Yi Wu ◽

...

Keyword(s):

High Efficiency ◽

Silicone Oil ◽

Hydroxyl Groups ◽

Water Mixture ◽

Silica Nanospheres ◽

Nanofiber Membrane ◽

Water Separation ◽

Oil Water Separation ◽

Silica Nanostructures ◽

Oil Water

AbstractHigh efficiency and anti-pollution oil/water separation membrane has been widely explored and researched. There are a large number of hydroxyl groups on the surface of silica, which has good wettability and can be used for oil-water separation membranes. Hydrophilic silica nanostructures with different morphologies were synthesized by changing templates and contents of trimethylbenzene (TMB). Here, silica nanospheres with radical pores, hollow silica nanospheres and worm-like silica nanotubes were separately sprayed on the PVA-co-PE nanofiber membrane (PM). The abundance of hydroxyl groups and porous structures on PM surfaces enabled the absorption of silica nanospheres through hydrogen bonds. Compared with different silica nanostructures, it was found that the silica/PM exhibited excellent super-hydrophilicity in air and underwater “oil-hating” properties. The PM was mass-produced in our lab through melt-extrusion-phase-separation technique. Therefore, the obtained membranes not only have excellent underwater superoleophobicity but also have a low-cost production. The prepared silica/PM composites were used to separate n-hexane/water, silicone oil/water and peanut oil water mixtures via filtration. As a result, they all exhibited efficient separation of oil/water mixture through gravity-driven filtration.

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TiO2 Coated Polypropylene Membrane by Atomic Layer Deposition for Oil–Water Mixture Separation

Advanced Fiber Materials ◽

10.1007/s42765-021-00069-9 ◽

2021 ◽

Vol 3 (2) ◽

pp. 138-146

Author(s):

Chen Li ◽

Lipei Ren ◽

Chunhua Zhang ◽

Weilin Xu ◽

Xin Liu

Keyword(s):

Atomic Layer Deposition ◽

Atomic Layer ◽

Water Mixture ◽

Mixture Separation ◽

Polypropylene Membrane ◽

Layer Deposition ◽

Oil Water

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Gravity-Driven Separation of Oil/Water Mixture by Porous Ceramic Membranes with Desired Surface Wettability

Materials ◽

10.3390/ma14020457 ◽

2021 ◽

Vol 14 (2) ◽

pp. 457

Author(s):

Chunlei Ren ◽

Wufeng Chen ◽

Chusheng Chen ◽

Louis Winnubst ◽

Lifeng Yan

Keyword(s):

Porous Ceramic ◽

Ceramic Membranes ◽

Separation Performance ◽

Water Mixture ◽

Alumina Membrane ◽

Water Separation ◽

Alumina Membranes ◽

Oil Water Separation ◽

Gravity Driven ◽

Oil Water

Porous Al2O3 membranes were prepared through a phase-inversion tape casting/sintering method. The alumina membranes were embedded with finger-like pores perpendicular to the membrane surface. Bare alumina membranes are naturally hydrophilic and underwater oleophobic, while fluoroalkylsilane (FAS)-grafted membranes are hydrophobic and oleophilic. The coupling of FAS molecules on alumina surfaces was confirmed by Thermogravimetric Analysis and X-ray Photoelectron Spectroscopy measurements. The hydrophobic membranes exhibited desired thermal stability and were super durable when exposed to air. Both membranes can be used for gravity-driven oil/water separation, which is highly cost-effective. The as-calculated separation efficiency (R) was above 99% for the FAS-grafted alumina membrane. Due to the excellent oil/water separation performance and good chemical stability, the porous ceramic membranes display potential for practical applications.

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Optimal Control Strategy for Ice-Storage System Based on Hourly Dynamic Load Simulation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.671-674.2515 ◽

2013 ◽

Vol 671-674 ◽

pp. 2515-2519

Author(s):

Xue Mei Wang ◽

Zhen Hai Wang ◽

Xing Long Wu

Keyword(s):

Optimal Control ◽

Air Conditioning ◽

Control Strategies ◽

Storage System ◽

Simulation Software ◽

Ice Storage ◽

Optimal Control Strategy ◽

Air Conditioning System ◽

Energy Plus ◽

Load Simulation

This project aims to study the optimal control model of the ice-storage system which is theoretically close to the optimal control and also applicable to actual engineering. Using Energy Plus, the energy consumption simulation software, and the simple solution method of optimal control, researchers can analyze and compare the annual operation costs of the ice-storage air-conditioning system of a project in Beijing under different control strategies. Researchers obtained the power rates of the air-conditioning system in the office building under the conditions of chiller-priority and optimal contro1 throughout the cooling season. Through analysis and comparison, they find that after the implementation of optimal control, the annually saved power bills mainly result from non-design conditions, especially in the transitional seasons.

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