에너지 저장 장치의 필수 요소인 리튬에 대한 필요성이 증가함에 따라 전 세계 리튬 침전물의 주요 공급원인 염 수로부터 효율적인 리튬 회수 방법의 개발이 요구됩니다. 염수로부터 리튬을 회수하는 과정은 유사한 특성을 가진 공존하는 이온의 존재로 인해 복잡합니다. 크라운 에테르 기능화된 막은 선택적 리튬 회수를 위한 유망한 솔루션을 제시합니다. 이온- 쌍극자 상호 작용을 통한 금속 이온에 대한 강한 친화력으로 유명한 크라운 에테르는 공동-이온 크기 호환성에 기반한 리튬 이온의 선택적 추출을 촉진하는 “호스트-게스트” 복합체를 형성합니다. 다양한 연구에서 크라운 에테르 이식된 막이 리튬 선 택성을 향상시키는 데 효과가 있음이 입증되었습니다. 이 리뷰는 크라운 에테르 기능화된 막의 발전을 탐구하여 염수로부터 의 리튬 회수 문제를 해결할 수 있는 잠재력을 보여줍니다.

This review explores the potential of pillared bentonite materials as solid acid catalysts for synthesizing diethyl ether, a promising renewable energy source. Diethyl ether offers numerous environmental benefits over fossil fuels, such as lower emissions of nitrogen oxides (NOx) and carbon oxides (COx) gases and enhanced fuel properties, like high volatility and low flash point. Generally, the synthesis of diethyl ether employs homogeneous acid catalysts, which pose environmental impacts and operational challenges. This review discusses bentonite, a naturally occurring alumina silicate, as a heterogeneous acid catalyst due to its significant cation exchange capacity, porosity, and ability to undergo modifications such as pillarization. Pillarization involves intercalating polyhydroxy cations into the bentonite structure, enhancing surface area, acidity, and thermal stability. Despite the potential advantages, challenges remain in optimizing the yield and selectivity of diethyl ether production using pillared bentonite. The review highlights the need for further research using various metal oxides in the pillarization process to enhance surface properties and acidity characteristics, thereby improving the catalytic performance of bentonite for the synthesis of diethyl ether. This development could lead to more efficient, environmentally friendly synthesis processes, aligning with sustainable energy goals.

In this study, when Butyl ether, a type of diether-based oxygenated fuel, is mixed in each volume ratio in a naturally aspirated direct injection diesel engine, the exhaust gas emission characteristics of the oxygenated component in the fuel affect each operating area of the engine I wanted to investigate the effect on. For comparative measurement of engine performance and exhaust emissions, commercial diesel and butyl ether mixed fuels were classified into 4 types according to the mixing ratio and tested. As the content of butyl ether in fuel increases, soot emission reduction increases, and when the maximum mixing amount of butyl ether (diesel 80vol-% + BE 20vol%) is applied, compared to the case of using only diesel as fuel, at 2500 rpm and no load, 39%, and about 32% of smoke reduction effect at full load was confirmed.

Decabromodiphenyl ether (BDE209) is a persistent aromatic compound widely associated with environmental pollutants. Given its persistence and possible bioaccumulation, exploring a feasible technique to eradicate BDE209 efficiently is critical for today’s environmentally sustainable societies. Herein, an advanced nanocomposite is elaborately constructed, in which a large number of titanium dioxide ( TiO2) nanoparticles are anchored uniformly on two-dimensional graphene oxide (GO) nanosheets ( TiO2/GO) via a modified Hummer’s method and subsequent solvothermal treatment to achieve efficient photocatalytic degradation BDE209. The obtained TiO2/ GO photocatalyst has excellent photocatalytic due to the intense coupling between conductive GO nanosheets and TiO2 nanoparticles. Under the optimal photocatalytic degradation test conditions, the degradation efficiency of BDE209 is more than 90%. In addition, this study also provides an efficient route for designing highly active catalytic materials.

Wide-area surface decontamination is essential in the emergency situation of release of radioisotopes to public such as nuclear accident or terrorist attack. Here, a self-generated hydrogel based on the reversible complex between poly (vinyl alcohol) (PVA) and phenylboronic acid-grafted poly (methyl vinyl ether-alt-mono-sodium maleate) (PBA-g-PVM-SM) was developed to remove the radioactive cesium from surface. Two aqueous polymeric solutions of PVA and PBA-g-PVM-SM containing sulfur-zeolite were simultaneously applied to surfaces, which subsequently self-generated a hydrogel based on the PBA-diol ester bond. The sulfur-zeolite suspended in hydrogel selectively remove the 137Cs from contaminated surface and easily separated from the dissociable used hydrogel by simple water rinsing. In radioactive tests, the resulting hydrogel containing sulfur-chabazite displayed high 137Cs removal efficiencies of 96.996% for painted cement and 63.404% for cement, which was 2.33 times higher than that of commercial strippable coating (Decongel). Considering the intrinsic various ion-exchange ability of zeolite, our hydrogel system has the excellent potential for the effective removal of various hazardous contamination including radionuclides from the surface.

본 연구는 합성된 zeolitic imidazolate framework-7 (ZIF-7)을 poly(ether-b-amide) 2533 (PEBAX2533)에 혼합하여 혼합막을 제조하고, 단일기체(N2, CO2)를 투과하여 기체에 대한 성질을 조사하였다. FT-IR, XRD, FE-SEM을 통해 ZIF-7이 가지는 피크와 형상을 확인하였고, 합성이 잘 되었음을 판단하였다. TGA를 통해 ZIF-7이 우수한 열적 안정성을 가지는 것과 막 내에 혼입되었을 때 순수 PEBAX2533에 비해 열적 안정성이 향상되는 것을 확인하였다. BET를 통해 합성된 ZIF-7의 CO2 흡착 능력이 우수하고 CO2/N2 흡착 선택도가 약 49.64로 높은 편이라는 것을 확인하였다. 기체 투과는 혼합막에서 ZIF-7 함량 이 증가함에 따라 N2 투과도는 감소하고 CO2 투과도는 비교적 적게 감소하면서 CO2/N2 선택도는 꾸준히 증가하는 모습을 보였다. 특히 ZIF-7 20 wt%이 첨가되었을 때 CO2 투과도가 크게 감소하지 않고 선택도가 상당히 증가하여 Robeson upper-bound 에 근접하는 결과를 얻었다.

2-브로모에틸 에틸 에테르를 이용한 2-에티닐피리딘의 무촉매 중합을 통하여 측쇄에 에테르 부분을 갖는 새로운 공액구조 고분자를 합성하였다. 이 중합반응은 비교적 낮은 온도 조건에서도 균일하게 잘 진행 되었으며 89%의 수율로 해당 고분자를 합성할 수 있었다. NMR, IR, UV-visible 분광분석기 등을 이용하여 고 분자의 구조를 분석한 결과 설계한 치환기를 갖는 해당 고분자가 합성되었음을 확인할 수 있었다. 본 고분자는 물을 포함한 DMF, DMSO, DMAc, 메탄올 등의 유기 용매에 완전히 용해하였다. 합성 고분자의 전기화학적 특성과 광발광 특성을 측정하고 분석하였다.