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Adsorption behavior of cadmium ions from aqueous solution using pen shells
전충 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.58 No.-
Pen shells which have some functional groups like amide, amino and carboxyl groups were used as anadsorbent to remove cadmium ions from an aqueous solution. The functional groups in pen shells wereinvestigated by FT-IR and the surface condition of pen shells and existence of cadmium ions onto the penshells were confirmed by the SEM and EDX analyses. The highest adsorption capacity could be achievedas about 35.652 mg/g at the initial pH 4 of aqueous solution. Two adsorption isotherm models namely,Langmuir and Freundlich were used tofit the equilibrium data and the experimental data well follows theLangmuir isotherm model (r2 = 0.992) and the maximum adsorption capacity (qm) for cadmium ions wasachieved as the 37.630 mg/g by the Langmuir model. Also, adsorption kinetics for cadmium on the penshells followed pseudo second order rate equation with 0.999 of correlation coefficient and the calculatedqe value (35.594 mg/g) was in excellent agreement with the experimental qe value (37.630 mg/g). Changing of temperature of the aqueous solution could not greatly affect during the adsorption processbetween cadmium ions and pen shells. Also, pen shells had a high selectivity to the cadmium ions Inaddition, the desorption efficiency of cadmium ions was about 98.0% at the 0.5 M of HCl and adsorptioncapacity of cadmium ions for reused pen shells can be still maintained at 31.65 mg/g level until the 2ndcycle. From the result, adsorption process using pen shells could be applied to the removal system ofcadmium ions from aqueous solution and it was suggested that conventional treatment process usingcommercial ion-exchange resin can be sufficiently replaced with economical process using waste penshells with comparative high adsorption capacity.
Adsorption characteristics of immobilized coffee ground beads for silver ions
전충 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
To efficiently adsorb silver ions from industrial wastewater, powdered coffee grounds were immobilized as a bead form by modified polyvinyl alcohol and boric acid method. The beads with 2.0mm of diameter have the 9.87 m2/g of surface area and were stable in the range of ~45oC and to all pH range in wastewater without untangling. In addition, the beads have excellent mechanical strength and low swelling ratio. The Langmuir isotherm model showed significant fit to the equilibrium adsorption data and maximum adsorption capacity of 39.583 mg/g of silver ions was achieved at the pH 6.0 of wastewater. The breakthrough point was appeared around 180 (1.0 mL/min) and 340 bed volumes (0.5mL/min), respectively, and 6 bed volumes of 1.0M HNO3 solution was required to get desorption efficiency of 95% in continuous process. And, the bed volumes can be still maintained as 310 even though secondary reused immobilized coffee ground beads were used.
질산을 이용한 게껍질에 흡착된 은 이온의 탈착 및 재생 특성
전충 유기성자원학회 2013 유기물자원화 Vol.21 No.4
A study on desorption and regeneration characteristics for silver ions adsorbed onto crab shells was carried out by means of Nitric acid soultion which was selected as the best desorbing agent. Desorption efficiency for silver ions was the highest as about 96%at the 1.0M of Nitric acid concentration. Also, silver ions was almost desorbed below 1.0of S/L(mg/mL) ratio which is defined as the ratio of adding amount of adsorbent and volume of desorbing agent and most of desorption process was completed within 60min. And removal efficiency of reused crab shells for silver ions was maintained as about 92%until the 2nd cycle. 게껍질에 흡착된 은 이온의 탈착과 재생특성에 관한 연구가 최적의 탈착제로서 선정된 질산을 이용하여수행되어졌다. 1.0M의 질산농도에서 은 이온의 탈착율은 96%로서 가장 높았다. 또한, 투입된 흡착제의 양과 탈착제의 부피로서 정의되는 S/L비가 1.0보다 작을 때에는 대부분의 은 이온이 탈착되어졌으며 대부분의 탈착 공정은 60분 내에 일어났다. 그리고 재사용된 게껍질을 흡착제로 다시 이용하였을 때 2회까지는92%의 은 이온 탈착율을 유지하였다.
전충 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.40 No.-
Powdered sericite impregnated into nickel hexacyanoferrate (NiHCF-sericite) was immobilized as a beadform by entrapment method using sodium alginate. The immobilized NiHCF-sericite beads haveexcellent mechanical strength and the increase of pressure drop caused channeling of flow was notobserved through column processes even though long time operation. The existence of cesium ions ontothe surface of the immobilized NiHCF-sericite beads was verified by the scanning electron microscopy(SEM) and energy dispersive X-ray spectroscopy (EDX). The maximum adsorption capacity for cesiumions of immobilized NiHCF-sericite beads was determined as the 13.877 mg/g at the initial pH 5.0 ofaqueous solution and the equilibrium data followed well the linearized Langmuir isotherm equationwhich has the higher correlation coefficient (0.993). The breakthrough point was emerged around 50(1.0 mL/min) and 80 bed volumes (0.5 mL/min) and the bed volumes can be still maintained as the75 even though secondary reused immobilized NiHCF-sericite beads were used.
전충 유기성자원학회 2013 유기물자원화 Vol.21 No.3
중금속에 의한 토양오염문제는 주로 폐 금속광산의 주변 농경지등에서 발생되어져 왔으며 이를 해결하기위한 비용은 수질이나 대기오염에 비해서 훨씬 크며 시간도 많이 소요되어진다고 알려져 있다. 지금까지 중금속으로 오염된 토양을 복원시키기 위한 경제적이고 실용적인 많은 기술들이 개발되어지고 제안되어져 왔다. 그래서 본 연구에서는 최근까지 국내/외에서 개발되어지거나 실용화되어지고 있는 다양한 기술들의 특성 및 장·단점 등에 대하여 고찰하고자 한다. It is well known that problem for contaminated soil with heavy metals is mainly produced from agricultural land around abandoned metal mine and the cost to solve them is much higher than those of water and air pollution in addition, it takes much more time to clarify the contaminated soil. Until now, economical and practical many techniques to remediate contaminated soils with heavy metals have been developed and proposed. Therefore, in this study, characteristic, merit and weakness for various techniques which are developing and commercializing recently in domestic/foreign country will be reviewed.
Carboxylated alginic acid bead에 의한 염료폐수내의 중금속 제거
전충,이도현 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Carboxylated alginic acid bead를 이용한 중금속 제거에 관한 염색폐수의 영향에 대해 연구를 수행하였다. Carboxy lated alginic acid bead를 담체로 사용하였을 때 납과 구리이온의 흡착에 미치는 염색폐수의 영향은 매우 작았다. 또한, 납 이온이 염색폐수와 같이 섞여 있을 때 흡착공정은 거의 2~3시간 내에 이루어 졌으며 50ppm의 납 이온은 0.3g의 담체만으로 대부분 제거 되었다. 이와 같은 결과는 Carb oxylated alginic acid bead가 염색폐수 내에 존재하는 중금속 이온의 제거에 대해서 효과적인 흡착제임을 의미한다.