Improved thin-film-composite forward-osmosis membrane for coal mine water purification

Liu, Eryong; Jing, Weiqi; Zhang, Xing; Du, Shuangming; Zeng, Zhixiang; Zhu, Lijing; Du, Huiling

doi:10.1016/j.matchemphys.2022.126011

Cited by 6 publications

(5 citation statements)

References 29 publications

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“…(1) In this case, taking the derivative of formula (1) gives us the following formula (2) It can be obtained from formula (2) (3) Assuming market equilibrium St=Dt, equation (3) can be converted to the following expression Rewrite the above formula, and you end up with the following formula (4)…”

Section: Exchange Rate Factormentioning

confidence: 99%

“…On the contrary, the appreciation of the local currency, other conditions remain unchanged, the price of imported goods may be reduced, which can play a role in curbing the overall level of prices. That is, the appreciation of the local currency is conducive to imports, which leads to an increase in the number of domestic imports [2], so the price of domestic imports is reduced.…”

Section: Exchange Rate Factormentioning

confidence: 99%

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The Analysis of Vital Food Cost

Chen

2023

AEMR

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This paper analyzes the price fluctuation trends of four essential foods in Canada, Australia, Japan, South Africa and Sweden during 2018-2022, so as to explore the factors affecting the price of essential foods and predict the future trend of food prices. According to the sample data, the data cleaning work was carried out to obtain the price growth rate excluding the price factor, and the data visualization chart was established combining the characteristics of cpi index, time change, and national conditions. Combining a variety of data visualization charts to analyze and study the problem, it has good practicability and accuracy.

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Section: Exchange Rate Factormentioning

confidence: 99%

Section: Exchange Rate Factormentioning

confidence: 99%

The Analysis of Vital Food Cost

Chen

2023

AEMR

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“…Therefore, emergency technology that can filter mine water into drinking water will effectively extend the lives of trapped people. Weiqi Jing et al assembled a forward osmosis membrane in a portable water bag, and the water bag produced was successfully applied in an emergency rescue by Shendong Coal Mine Company (Yulin, China) [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

“…It has attracted widespread attention as a surface modifier for coatings due to its surface adhesion and anti-fouling properties. Previous studies have indicated that polyamide/polysulfone forward osmosis membranes with PDA possess excellent hydrophilicity, and the thickness of the PDA layer plays a dominant role in permeability [ 2 , 35 ]. Furthermore, the studies of Kallem et al suggested that the hydrophilicity and water flux significantly improved by co-doping with PDA and TiO 2 , and this is beneficial for use in the recovery of oily wastewater [ 36 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Polydopamine/Sodium Dodecyl Sulfate Modified Halloysite on the Microstructure and Permeability of a Polyamide Forward Osmosis Membrane

Jing

Liu

et al. 2023

Membranes

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Mine water cannot be directly consumed by trapped people when a mine collapses, so it is difficult for people to carry out emergency rescues to ensure their safety. Therefore, a water bag made of a forward osmosis (FO) membrane has been designed that can efficiently filter coal mine water to meet the urgent needs of emergency rescue. Before interfacial polymerization (IP), sodium-dodecyl-sulfate-modified halloysite (SDS−HNT) was added to an MPD aqueous solution to prepare an SDS−HNT polyamide active layer, and then the prepared membrane was placed into a polydopamine (PDA) solution formed by the self-polymerization of dopamine and a PDA/SDS−HNT composite film was prepared. The results showed that the original ridge−valley structure of the polyamide membrane was transformed to a rod-, circular-, and blade-like structure by the addition of SDS−HNTs. Subsequently, a dense PDA nanoparticle layer was formed on the modified membrane. The polyamide/polysulfone forward osmosis membrane modified by co-doping of PDA and SDS−HNTs displayed both the best water flux and rejection rate, confirming the synergistic effect of compound modification. Therefore, the high-performance permeability of the polyamide membrane modified by SDS−HNTs and PDA provides great convenience for the emergency filtration of coal mine water, and also has potential applications in wastewater treatment and seawater desalination.

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“…Coal mining activities produce mine water, which contains a lot of inorganic salts and metal ions. The direct discharge of this mine water would lead to land salinization and destruction of the ecological environment. , The treatment of mine water would greatly increase the cost of coal mining. − Therefore, if the mine water could be reused, it could reduce not only the cost of coal mining but also the water pollution. , In view of the above problems, this paper put forward a method of mine water reuse. This method used high sulfate mine water to dissolve chlorine inhibitors to save water resources.…”

Section: Introductionmentioning

confidence: 99%

Influence of High Sulfate Mine Water on Spontaneous Combustion of Coal

et al. 2022

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Mine water cannot be discharged until it has been treated, which increases the cost of mining and causes environmental damage. This paper attempted to use sulfate mine water as a flame retardant material for the treatment of coal spontaneous combustion (CSC) in underground mines. The temperature-programed experimental device and gas chromatograph were used to simulate the low-temperature oxidation process of coal. Infrared spectroscopy was used to study the influence and inhibition mechanism of mine water and chloride inhibitor on active functional groups. It was found that although the sulfate mine water inhibited the formation of −OH, it accelerated the cleavage of the aromatic ring. The thermogravimetric experiment was used to analyze the ignition temperature and activation energy of different coal samples. It was found that mine water had an obvious effect on inhibiting CSC in the combustion stage, which could increase the oxidation temperature of coal.

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Improved thin-film-composite forward-osmosis membrane for coal mine water purification

Cited by 6 publications

References 29 publications

The Analysis of Vital Food Cost

The Analysis of Vital Food Cost

Effect of Polydopamine/Sodium Dodecyl Sulfate Modified Halloysite on the Microstructure and Permeability of a Polyamide Forward Osmosis Membrane

Influence of High Sulfate Mine Water on Spontaneous Combustion of Coal

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