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Song, Jinju,Gim, Jihyeon,Park, Sohyun,Kim, Jaekook Elsevier 2018 ELECTROCHIMICA ACTA Vol.261 No.-
<P><B>Abstract</B></P> <P>P2-structure sodium manganese oxide is synthesized by a facile reduction reaction. We provide new data on the direct use of sodium manganese oxide instead of lithium analogues as a low-cost electrode for lithium/sodium hybrid ion batteries after an ion-exchange process. Ion exchange occurs in sodium manganese oxide through the electrolyte during cell stabilization, as observed by X-ray diffraction analysis. The self ion-exchanged material delivers a high discharge capacity of 195 mA h g<SUP>−1</SUP> and a stable plateau at 3.0 V for 50 cycles with stable cyclability. In-situ X-ray diffraction and ex-situ X-ray absorption near edge structure studies also confirm reversible redox reactions and stable structural changes. The ex-situ inductively coupled plasma atomic emission spectroscopy analysis verifies that residual sodium ions in the structure act as pillars during cycling.</P>
An, Byungryul,Lee, Soonjae,Kim, Hee-Gon,Zhao, Dongye,Park, Jeong-Ann,Choi, Jae-Woo THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2019 JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY -S Vol.69 No.-
<P><B>Abstract</B></P> <P>A hybrid adsorbent was prepared in bulk by immobilizing copper onto commercially available natural chitosan as the polymeric matrix for selective removal of phosphate from a reservoir that was severely affected by algae bloom. The batch test showed ∼35mgg<SUP>−1</SUP> as P sorption capacity for phosphate and the laboratory scale column test for synthetic wastewater yielded the following affinity order: phosphate>sulfate>nitrate. The field-scale adsorption test showed that the effluent T-P satisfied the 0.2mgL<SUP>−1</SUP> standard. Overall results insinuate that the hybrid adsorbent can be considered as a promising candidate for efficient phosphate removal materials.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The hybrid adsorbent was consisted of chitosan bead immobilizing metal ion. </LI> <LI> The adsorbent was tested with respect to sorption of T-P compared with T-N. </LI> <LI> The pilot plant was operated at Seo-Ho reservoir for approximately six months. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Asif Ali Khan,Leena Paquiza 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
The kinetics and mechanism for the ion-exchange processes like Mg(II)–H(I), Ca(II)–H(I), Sr(II)–H(I),Ba(II)–H(I), Ni(II)–H(I), Cu(II)–H(I), Mn(II)–H(I) and Zn(II)–H(I) at different temperatures usingapproximated Nernst–Plank equation under the particle diffusion controlled phenomenon werestudied for the polypyrrole zirconiumtitanium phosphate nanocomposite cation exchanger. TEM provesthe formation of the nanocomposite cation exchanger. Some physical parameters, i.e. fractionalattainment of equilibrium UðtÞ, self-diffusion coefficients (D0), energy of activation (Ea) and entropy ofactivation (DS8) have been estimated. These results are useful for predicting the ion exchange processoccurring on the surface of this cation-exchanger.
안병렬,이순재,김희곤,Dongye Zhao,박정안,최재우 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.69 No.-
A hybrid adsorbent was prepared in bulk by immobilizing copper onto commercially available natural chitosan as the polymeric matrix for selective removal of phosphate from a reservoir that was severely affected by algae bloom. The batch test showed ∼35 mg g−1 as P sorption capacity for phosphate and the laboratory scale column test for synthetic wastewater yielded the following affinity order: phosphate > sulfate > nitrate. The field-scale adsorption test showed that the effluent T-P satisfied the 0.2 mg L−1 standard. Overall results insinuate that the hybrid adsorbent can be considered as a promising candidate for efficient phosphate removal materials.
Development of hybrid resin to reduce silica in borated water
Ramzan Akhtar,Shahid Latif,Syed Aizaz Ali Shah,Shaukat Saeed,Abdul Aziz Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7
Amberlite IRN-78 resin was incorporated with iron to make a hybrid resin for the removal of silica from the borated water of nuclear power plants. The hybrid resin contained 0.84 wt % iron compounds upon pyrolysis. In batch experiments carried out at room temperature, 1 g of the hybrid resin removed ~60 ㎍ silica from 1 ppm borated water in ~120 min. The efficiency of the hybrid material increased with the resin quantity, decreased with silica concentration, and remained unchanged at different pH values. Freundlich and Temkin isothermal adsorption dominated the silica removal process and followed the pseudo-first-order and intra-particle diffusion mechanism simultaneously. The concentration of the leached iron remained appreciably under the safe limits of 200 ㎍/l during the experiments. This detailed study suggests the use of hybrid resin for the removal of silica from borated water streams and other similar systems.
Vijayalekshmi Vijayakumar,남상용 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.70 No.-
Anion exchange membranes (AEMs) play prominent role in addressing alkaline fuel cell efficiency andcost. Great deal of efforts has been made in the past, particularly during the last couple of years to reachAEMs with high hydroxide conductivity, good chemical/thermal/mechanical stability, fuel cross-overresistance and low cost. The purpose of this review is to summarize and discuss the progress on thedevelopment of different AEMs for alkaline fuel cells over the last three years. The alternative AEMs basedon the modified synthetic and sustainable polymers, organic/inorganic hybrid materials and additives arereviewed in the context of AEM materials.