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Review for Immobilization Methods of Biosorbent
전충 유기성자원학회 2011 유기물자원화 Vol.19 No.2
Immobilization of biosorbent is very important for application to real wastewater treatment process because biosorbent itself does not have enough tough structure. Therefore, resent research on heavy metal biosorption using biomass has been focused on its efficient immobilization method. To improve the mechanical strength of freely biosorbent, many immobilization methods have been suggested for applications to the biosorbent such as microorganisms or polysaccharides. In this study, various immobilization methods such as adsorption, covalent binding, entrapment, encapsulation, and crosslinking will be introduced.
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.
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.
전충,차주현,최재영 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
Powdered phosphorylated sawdust was immobilized as bead form to apply to the adsorption andrecovery of indium(III) from industrial wastewater. Swelling of beads, channeling of flow and theincrease of pressure drop were not observed through column operations. The maximum adsorptioncapacity using Langmuir isotherm model was 1.121 mg/g. The breakthrough point for indium(III) wasappeared around 25 (1.0 mL/min) and 42 bed volumes (0.5 mL/min), respectively and indium(III) boundto the beads was readily desorbed and recovered by a few bed volumes of 0.5 M of HCl solution. Furthermore, breakthrough point of indium(III) for secondly reused beads can be still maintained asabout 39.
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.