Hydrophilic and positively charged polyethylenimine-functionalized mesoporous magnetic clusters for highly efficient removal of Pb(II) and Cr(VI) from wastewater

Lee, Min Young,Lee, Ji Hwan,Chung, Jae Woo,Kwak, Seung-Yeop Academic Press 2018 Journal of Environmental Management Vol. No.

<P><B>Abstract</B></P> <P>We develop mesoporous magnetic clusters (MMCs) functionalized with hydrophilic branched polyethylenimine (b-PEI), later called b-MG, and MMCs functionalized with positively charged b-PEI (p-MG). These materials efficiently remove Pb(II) and Cr(VI) from wastewater. Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis, and nitrogen adsorption–desorption analysis results clearly indicate that hydrophilic b-PEI and positively charged b-PEI are successfully attached to the MMC surfaces. Wide-angle X-ray diffraction, high-resolution transmission electron microscopy, and field-emission scanning electron microscopy analyses confirm that the crystal structures and morphologies of the MMCs are maintained well even when wet chemical modification processes are used to introduce hydrophilic b-PEI and positively charged b-PEI to the MMC surfaces. Langmuir and Sips isotherm models are applied to describe Pb(II) adsorption behavior of the b-MG and Cr(VI) adsorption behavior of the p-MG. The isotherm models indicate that the maximum adsorption capacities of b-MG and p-MG, respectively, are 216.3 and 334.1 mg g<SUP>−1</SUP>, respectively. These are higher than have previously been found for other adsorbents. In reusability tests, using magnetic separation and controlling the pH, the Pb(II) recovery efficiency of the b-MG is 95.6% and the Cr(VI) recovery efficiency of the p-MG is 68.0% even after the third cycle.</P> <P><B>Highlights</B></P> <P> <UL> <LI> b-MG and p-MG have abundant adsorption sites for Pb(II) and Cr(VI). </LI> <LI> b-MG and p-MG exhibited high adsorption capacities for Pb(II) and Cr(V). </LI> <LI> b-MG and p-MG could be magnetically separated from water and repeatedly used. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Schematic of the facile removal of heavy metal ions using branched polyethylenimine-functionalized mesoporous magnetic clusters (b-MG) and positively charged branched polyethylenimine-functionalized mesoporous magnetic clusters (p-MG) as adsorbents.</P> <P>[DISPLAY OMISSION]</P>

Improvement of CO₂ capture by graphite oxide in presence of polyethylenimine

Shin, G.J.,Rhee, K.,Park, S.J. Pergamon Press ; Elsevier Science Ltd 2016 International journal of hydrogen energy Vol.41 No.32

<P>In this study, we developed a new CO2 adsorbents based on graphite oxide (GO) modified with amine groups from polyethylenimine. GO was prepared by a modified Hummers' method. An investigation of CO2 adsorption by the polyethylenimine-impregnated GO showed that the CO2 adsorption capacity increased with increasing polyethylenimine content. Polyethyleneimine increases the amount of adsorption of CO2 resulting from a chemical bond. The polyethylenimine-impregnated GO exhibited higher CO2 adsorption capacity than pristine GO. From the results, the maximum CO2 adsorption capacity and CO2/N-2 selectivity were 32.89 mg g(-1) and 37.13, respectively, at a polyethylenimine content of 60 wt%. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.</P>

Improvement of CO₂ capture of graphite oxide in the presence of polyethylenimine

신기주,박수진 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1

Global warming was becoming more and more of a concern as a result of the continuing emission of a major greenhouse gas, carbon dioxide (CO₂), which is generated from fossil fuel combustion. However, fossil fuels were demanded as an essential resource. Therefore, it is essential to technology of reduced CO₂ emission. In this study, we converted graphite oxide (GO) with amine groups from polyethylenimine due to improve a new CO₂ adsorbent. The polyethylenimine-impregnated GO was then investigated for CO₂ adsorption. Consequentially, the CO₂ chemisorption capacity was developed by increasing of polyethylenimine contents. And the selectivity improves than pristine GO, which indicated little N₂ affinity.

Polyethylenimine-Poly(amidoamine) Dendrimer Modified with L-Arginines as an Efficient Gene Delivery Vector

안난영,최준식,김태훈,송수정,문정미,하태환 한국고분자학회 2015 Macromolecular Research Vol.23 No.8

In this study, we synthesized polyethylenimine-polyamidoamine-arginine dendritic polymers (PPRs) as vectors for gene delivery. Four polymers, polyethylenimine-polyamidoamine generation 1 (PP1), PP2, PP1-arginine (PP1R), and PP2-arginine (PP2R), were synthesized and confirmed by 1H NMR. PPRs were shown to interact with and condense plasmid DNA effectively to form 171-179 nm polyplexes with 30-32 mV of zeta potentials at weight ratio 4:1 (polymer:plasmid DNA). Cytotoxicity of PPRs/pDNA complexes was lower than that of polyethylenimine (PEI) 25 kDa/pDNA complexes for all concentration ranges tested. In 293 cells, PP1R/pDNA complexes showed higher gene transfection efficiency than PEI 25 kDa. These results suggest that PPR could be promising dendritic gene carriers for gene therapy.

High-performance and acid-tolerant polyethylenimine-aminated polyvinyl chloride fibers: fabrication and application for recovery of platinum from acidic wastewaters

Bediako, John Kwame,Park, Sang Won,Choi, Jong-Won,Song, Mung-Hee,Yun, Yeoung-Sang Elsevier 2019 Journal of environmental chemical engineering Vol.7 No.1

<P><B>Abstract</B></P> <P>We report the fabrication and application of high-performance and acid-tolerant fibers comprising polyethylenimine (PEI) and polyvinyl chloride (PVC) for platinum recovery from acidic waste solutions. The fibers were fabricated by amination of PVC with PEI and spin-extrusion via phase-inversion mechanism. Factors including the effects of chloride concentration, pH, competing ions, and amount of PEI on the adsorption performance, were studied. The adsorption mechanism was evaluated through XPS analysis, in which electrostatic binding of Pt(IV) and its partially reduced Pt(II) were revealed. The maximum Pt adsorption capacity in 0.1 M HCl was estimated by the Langmuir isotherm model as 410.53 mg/g. The fibers were applicable to Pt recovery from actual metal refining wastewater and demonstrated high efficiency of regeneration through adsorption-desorption cycles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> High Pt(IV) recovery efficiency was achieved with adsorbent fibers consisting of polyethylenimine and polyvinyl chloride. </LI> <LI> The prepared fibers were self-crosslinked, thereby requiring no extra crosslinking for chemical stability and adsorption. </LI> <LI> Compared with Amberjet 4200 commercial resin and others, the Pt(IV) recovery efficiency of the prepared fibers was highest. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Polyethylenimine-Grafted Polyamidoamine Conjugates for Gene Delivery with High Efficiency and Low Cytotoxicity

김태훈,최준식,서호원,한진,고경수 한국고분자학회 2014 Macromolecular Research Vol.22 No.7

Hyperbranched polymers, polyamidoamine-methyl acrylate-polyethylenimine-ethylenediamine (PMPE)conjugates, were synthesized as a novel non-viral gene carrier based on polyamidoamine. These PMPE derivatives exhibithigh transfection efficiency and low cytotoxicity. We linked methyl acrylate (MA) on polyamidoamine (PAMAM) andgrafted PEI onto the PAMAM-MA, and then grafted ethylenediamine (EDA) onto the PAMAM-MA-PEI. Four polymers,PAMAM G2-MA-PEI 800-EDA, PAMAM G3-MA-PEI 800-EDA and PAMAM G2-MA-PEI 2000-EDA,PAMAM G3-MA-PEI 2000-EDA, were synthesized and characterized by 1H NMR. PMPE was shown to interactwith and condense plasmid DNA effectively to form 149-220 nm polyplexes with 34-43 mV of zeta potentials atweight ratio as 4:1 (polymer/plasmid DNA). Cytotoxicity of PMPE/pDNA complexes was lower than that of polyethylenimine(PEI) 25 kDa/pDNA complexes for all concentration ranges. In 293 and HeLa cells, PMPE/pDNA complexesshowed much higher gene transfection efficiency than PAMAM. These results suggested that PMPE is anattractive novel vector for non-viral gene delivery system.

Apoptosis Induced by Polyethylenimine/DNA Complex in Polymer Mediated Gene Delivery

이민형 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.1

Polyethylenimine (PEI) has been widely investigated for delivery of DNA into cells. It was previously reported that there were at least two types of cytotoxicity in PEI-mediated gene delivery, immediate and delayed toxicities. PEI-mediated gene delivery protocols use net cationic complexes with an excess of PEI to maintain equilibrium between the complexed and dissociated forms in solution. In this study, toxicity of free PEI or PEI/DNA complex was investigated. Human embryonic kidney 293 cells were incubated with free PEI or PEI/DNA complex for 4 hrs. Then, the cells were analyzed at 6, 24, 48, and 96 hrs after the incubation. In MTT assay, the viability of the cells incubated with PEI/DNA complex was continuously decreased with time, while that of the cells incubated with free PEI was not. On the contrary, the expression level of the luciferase gene increased gradually along with time. Release of DNAs from the complexes for transcription produces free PEIs in the cells. This process may proceed slowly due to high charge density of PEI and may be related to delayed toxicity. In addition, apoptotic cells were observed only in the cells incubated with the PEI/DNA complex from 24 hrs after the incubation. The results suggest that PEI/DNA complex contributes to the delayed toxicity by inducing apoptosis and that the delayed toxicity may be related to decomplexation of the complexes in the cells.

Willow-like portable triboelectric respiration sensor based on polyethylenimine-assisted CO₂ capture

Kim, Inkyum,Roh, Hyeonhee,Kim, Daewon unknown 2019 Nano energy Vol.65 No.-

<P><B>Abstract</B></P> <P>Real-time bio-signal detecting devices are critical for obtaining important physiological signals and recognizing respiratory diseases; the respiration sensor is one such important device. In this paper, human respiration is measured by using the triboelectric effect that converts the ambient mechanical energy into electrical energy by using a three-dimensional printed triboelectric respiration sensor (TRS). This TRS has a willow-like fluorinated ethylene propylene film between the right and left electrode plates; it generates electricity using a simple contact-separation motion. A 10 wt% solution of polyethylenimine, which enables carbon dioxide capturing, is coated and evaporated only on the right electrode of the TRS to distinguish the inspiration and expiration conditions. The distances between the adjacent electrodes, the air gap between the electrodes, and the top of the container in the TRS were systematically optimized by using the finite element method. The sensitivity to the air flow rate is characterized by different gradients of the output voltage. Analyzing the output voltage allows the TRS to identify four types of respirations: strong, weak, long, and short. This portable and self-powered respiration sensor will open new horizons for portable TRS devices because of its low cost and facile fabrication that uses three-dimensional printing technology. This device will also reduce the distress experienced by patients who are recovering from their respiratory disorders.</P> <P><B>Highlights</B></P> <P> <UL> <LI> 3D printed triboelectric respiration sensor (TRS) detects the human breathing with a fluorinated ethylene propylene film. </LI> <LI> Polyethylenimine solution was coated on the right electrode to distinguish expiration from inspiration. </LI> <LI> Finite element method was employed to optimize the structure for enhancing the velocity intensity of the laminar flow. </LI> <LI> Arduino sensing system was implemented to represent the respiration level as a practical application of the TRS. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

양이온성 고분자 (polyethylenimine)가 코팅된 알지네이트/폐바이오매스 복합 흡착소재를 사용한 유해 미세조류 Microcystis aeruginosa의 제거

김호선,변종웅,최인태,박윤환,김석,최윤이 한국환경생물학회 2019 환경생물 : 환경생물학회지 Vol.37 No.4

As the occurrence of harmful algal blooms (HABs) have become severe in precious water resources, the development of efficient harmful algae treatment methods is considering as an important environmental issue for sustainable conservation of water resources. To treat HABs in water resources, various conventional physical and chemical methods have been utilized and showed treatment efficiency, However, these methods can lead to discharging of cyanotoxins into the water bodies by chemical or physical algal cell lysis or destruction. Thus, to overcome this limitation, the development of safe HABs treatment methods is required. In the present study, adsorption technology was investigated for the removal of harmful algal species, Microcystis aeruginosa from aqueous phases. Industrial waste biomass, Corynebacterium glutamicum biomass was valorized as biosorbent (PEI-modified alginate/biomass composite fiber; PEI-AlgBF) for M. aeruginosa through immobilization with alginate matrix and cationic polymer (polyethylenimine; PEI) coating. The functional groups characteristic of PEI-Alg was determined using FT-IR analysis. By adsorption process used PEI-AlgBF, 52 and 67% of M. aeruginosa could be removed under the initial density of M. aeruginosa 200×104 cells mL-1 and 50×104 cells mL-1, respectively. As the increasing surface area of PEI-AlgBF, the removal efficiency was increased. In addition, we could find that adsorptive removal of M. aeruginosa has occurred without any M. aeruginosa cell lysis and destruction. 본 연구에서는 바이오매스 폐기물인 Corynebacterium glutamium을 Alg를 이용한 고정화와 PEI 표면개질 과정을 통하여 유해 미세조류인 Microcystis aeruginosa를 제거할 수 있는 흡착소재인 PEI-AlgBF를 개발하였다. 녹조의 발생단계에 상관없이 PEI-AlgBF는 수계로부터 M. aeruginosa를 성공적으로 제거할 수 있었으며 유해조류 제거과정에서 M. aeruginosa 세포의 파괴를 유발하지 않았다. 흡착소재의 표면적은 M. aeruginosa의 제거효율에 매우 큰 영향을 주는 주요인자로 확인할 수 있었다. PEI-AlgBF를 사용한 M. aeruginosa 흡착/제거 방식은 기존 기술에 비하여 환경영향성이 낮기 때문에 보다 안전하고 안정적인 유해조류의 제어 방식이 될 것이다.

Preparation and characterization of titanates nanotubes loaded with polyethyleneimine for carbon dioxide capture

신기주,박수진 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0

In this study, we developed a new CO2 adsorbent based on titanate nanotube (TNT) modified with amine groups from polyethylenimine. TNT was prepared by hydrothermal reaction. An investigation of CO2 adsorption by the polyethylenimine-impregnated TNT showed that the CO2 adsorption capacity increased with increasing polyethylenimine content. The CO2 adsorption capacities were measured at 298 K. 15% CO2 adsorption capacities were measured by TGA method. Polyethyleneimine increases the amount of adsorption of CO2 result from a chemical bond. The polyethylenimine-impregnated TNT exhibited higher CO2 adsorption capacity than pristine TNT.