Ca-Al LDH 합성방법이 전자폐수 내 황산이온 제거에 미치는 영향 평가

박태경,김용찬,박성원,곽민재,김경환,한인섭 한국도시환경학회 2021 한국도시환경학회지 Vol.21 No.3

In this research, the experiments were conducted to identify the effect of LDH synthesis condition and pretreatment to sulfate ion adsorption capacity. In the result of research, Ca:Al molar ratio, 2:1 was the most sulfate ion adsorption capacity among the Ca:Al molar ratio (1:1, 1.5:1, 2;1, 4:1). In the experiment using synthesized LDH utilized M2+ and M3+, The synthesized LDH utilized calcium ion as M2+ and Aluminum ion as M3+ was the best adsorbent for sulfate ion compared to magnesium ion as M2+ and Ferric ion as M3+. The result of calcination process effect to sulfate ion adsorption capacity was pronounced that calcination process affect the sulfate ion adsorption capacity and sulfate ion adsorption capacity was raised up to 1.2 times contray to raw CaAl LDH. Also, In the effect of calcination temperature to sulfate ion adsorption capacity, carcination temperature 450oC and 600oC were superior to carcination temperature 300oC. To evaluate the adsorption characteristics, adsorption isotherm and adsorption kinetics were processed. according to the study, Langmuir isotherm adsorption model (correlation coefficient, 0.950) was more suitable than Freundlich isotherm adsorption model. (correlation coefficient, 0.731) In the adsorption kinetics, pseudo 2nd order reaction (correlation coefficient 0.998) was more suited to sulfate ion adsorption than pseudo 1st order reaction. (correlation coefficient 0.539). Meanwhile, value of RL and 1/n from Langmuir and Freundlich isotherm adsorption model were calculated between 0 to 1. from the calculation, calcined CaAl LDH was profit to sulfate ion adsorption. 본 연구에서는 전자폐수에 포함되어 있는 황산이온에 대하여 CaAl LDH 합성조건 및 전처리가 황산이온 흡착용량 미치는영향에 대하여 평가를 진행하였다. 연구결과 Ca:Al molar ratio 1: 1, 1.5: 1, 2: 1, 4: 1 중 2: 1에서 가장 높은 흡착용량을 나타내었으며, M2+와 M3+ 종류에 따른 황산이온 흡착용량 평가 결과 M2+로 Ca이온, M3+로 Al을 활용하여 합성한 LDH에서 가장높은 황산이온 흡착용량을 나타내었다. 탄화과정이 황산이온 흡착용량에 미치는 영향에 대하여 평가한 실험 진행 결과 탄화과정을 진행한 calcined CaAl LDH에서 탄화과정을 진행하지 않은 raw CaAl LDH보다 높은 황산이온 흡착용량을 나타내었다. 또한 탄화온도가 황산이온에 대한 흡착용량에 미치는 영향에 대해 확인하기 위하여 진행한 실험에서는 탄화온도 450oC 와 탄화온도 600oC에서 탄화온도 300oC도 보다 높은 황산이온 흡착용량을 나타내었다. 황산이온의 calcined CaAl LDH로의흡착특성을 평가하기 위해 진행한 등온흡착실험 결과 Langmuir adsorption model에서 상관계수 0.950으로 Freundlich adsorption model 상관계수 0.731보다 높은 상관성을 지니는 것으로 나타났으며, 동역학적 모델 적용 결과 유사 2차 반응 모델에서 상관계수 0.998로 유사 1차 반응 모델 상관계수 0.539보다 높은 상관성을 나타내는 것으로 확인되었다. 한편 Langmuir model과 Freundlich model을 통해 산정된 RL과 1/n은 0과 1 사이로 산정되었으며, 이를 통해 calcined CaAl은 황산이온에 대한 흡착제로 적합한 것으로 판단된다.

천연 제올라이트의 수환경 개선용 기능성 소재로의 활용에 관한 연구 (2): 국내산 제올라이트의 중금속 이온 흡착 특성

노진환 ( No Jin Hwan ) 한국광물학회 2003 광물과 암석 (J.Miner.Soc.Korea) Vol.16 No.3

The adsorption property and ability of domestic zeolites for some heavy metal ions (Ag, Pb, Cr, Cu, Zn, Mn), which may cause a serious environmental problem in industrial wastewater, were evaluated on ore unit through a series of adsorption experiments together with careful examinations of mineral composition and properties of the zeolites. Though the adsorption behavior basically took place in the form of a cation exchange reaction, the higher CEC value does not necessarily to imply the higher adsorption capacity for a specific heavy metal. A general trend of the adsorption selectivity for heavy metals in the zeolites is determined to be as follow: Ag≥Pb>Cr,Cu≥Zn>Mn, but the adsorption properties of heavy metal ions somewhat depend on the species and composition of zeolite. Clinoptilolite tends to adsorb selectively Cu in case of Cr and Cu, whereas heulandite prefers Cr to Cu. A dominant adsorption selectivity of the zeolite ores for Ag and Pb is generally conspicuous regardless of their zeolite species and composition. The zeolite ores exhibit a preferential adsorption especially for Ag^(+) so as not to regenerate when treated with Na^(+). In the adsorption capacity for heavy meta ions, the zeolites differ in great depending on their species: ferrierite>clinoptilolite>heulandite. Considering the CEC value of mordenite, the mordenite-rich ore appears to be similar to the clinoptilolite ore in the adsorption capacity. The adsorption capacity for heavy metals is not positively proportional to the CEC values of the zeolites measured by the exchange reaction with ammonium ion. In addition, the adsorption capacity roughly tends to depend on the zeolite contents, i.e., the grade of zeolite ore, but the trend is not consistent at all in some ores. These may be caused by the adsorption selectivity for some specific heavy metals, the presence of possible stacking micro-faults and natural cations such as K hardly to exchange in the zeolite. Considering the economic availability and functional effectiveness as natural zeolite resources, clinoptilolite ores could be applicable to utilize the domestic zeolites for the removal of heavy metals.

Glutamic Acid-Grafted Metal-Organic Framework: Preparation, Characterization, and Heavy Metal Ion Removal Studies

( Phani Brahma Somayajulu Rallapalli ),( Jeong Hyub Ha ) 한국공업화학회 2023 공업화학 Vol.34 No.5

Fast industrial and agricultural expansion result in the production of heavy metal ions (HMIs). These are exceedingly hazardous to both humans and the environment, and the necessity to eliminate them from aqueous systems prompts the development of novel materials. In the present study, a UIO-66 (COOH)₂ metal-organic framework (MOF) containing free carboxylic acid groups was post-synthetically modified with L-glutamic acid via the solid-solid reaction route. Pristine and glutamic acid-treated MOF materials were characterized in detail using several physicochemical techniques. Single-ion batch adsorption studies of Pb(II) and Hg(II) ions were carried out using pristine as well as amino acid-modified MOFs. We further examined parameters that influence removal efficiency, such as the initial concentration and contact time. The bare MOF had a higher ion adsorption capacity for Pb(II) (261.87 mg/g) than for Hg(II) ions (10.54 mg/g) at an initial concentration of 150 ppm. In contrast, an increased Hg(II) ion adsorption capacity was observed for the glutamic acid-modified MOF (80.6 mg/g) as compared to the bare MOF. The Hg(II) ion adsorption capacity increased by almost 87% after modification with glutamic acid. Fitting results of isotherm and kinetic data models indicated that the adsorption of Pb(II) on both pristine and glutamic acid-modified MOFs was due to surface complexation of Pb(II) ions with available -COOH groups (pyromellitic acid). Adsorption of Hg(II) on the glutamic acid-modified MOF was attributed to chelation, in which glutamic acid grafted onto the surface of the MOF formed chelates with Hg(II) ions.

오미자를 이용한 Hg(I), Pb(II), U(VI) 이온들의 흡착

김관천,김준태,Kim, Kwan-Chun,Kim, Joon-Tae 대한환경위생공학회 2007 대한환경위생공학회지 Vol.22 No.1

This study was examined adsorption ability of heavy metal Hg(I), Pb(II), and U(Vl) ion use of fruit from schizandra chinensis, The fruits of schizandra chinensis sample used breaking into fragments $50{\sim}100$ mesh. The sample solution was mixed fruits of schizandra chinensis and heavy metal ion. Each heavy metal ion of into solution was quantum analysis with ICP-AES. As the result, each condition of maxium adsorption ability of heavy metal ion was high in the range of pH 5-7, adsorption time was about 15 minutes, and the optimum temperature was $100^{\circ}C$. The heavy metal ion was increased adsorption in order of increasing concentration and in ethanol solution better than in aqueous solution.

수용액에서 NTOE, NDOE가 결합된 Merrifield 수지를 이용한 Ag(I)의 흡착 및 분리 특성

이철규,김해중,Lee, Cheal-Gyu,Kim, Hae Joong 한국분석과학회 1999 분석과학 Vol.12 No.2

수용액에서 1,12-diaza-3,4:9,10-dibenzo-5,8-dioxacyclopentadecane(NTOE)가 결합된 merrifield 수지와 1,12,15-triaza-3,4:9,10-dibenzo-5,8-dioxacycloheptadecane(NDOE)가 결합된 merrifield 수지를 이용한 전이금속이온들의 흡착 및 분리특성을 조사하였다. 전이금속이온들의 흡착정도(adsorption degree, E)와 분포비(distribution ratio, D)의 순위는 동일하게 Cu(II)<Ni(II)<Co(II)<Zn(II)<Cd(II)<Pb(II)<Ag(I)를 나타내었으며, 전이금속이온들의 수화자유에너지의 기에 역비례함을 알 수 있었다. 또한 Co(II)-Cd(II)-Ag(I), Ni(II)-Cu(II)-Pb(II)와 Zn(II)-Cd(II)-Pb(II)-Ag(I)의 혼합금속용액에서 금속이온들의 용리곡선을 조사한 결과 금속이온의 머무름시간($t_R$)이 흡착정도와 분포비에 의해서 영향을 받았으며, 이러한 흡착 및 분리 실험 결과로부터 혼합금속용액에서 Ag(I)의 분리가능성을 확인할 수 있었다. The adsorption and separation behaviors of transition metal ions using a merrifield resin bound 1,12-diaza-3,4:9,10-dibenzo-5,8-dioxacyclopentadecane (NTOE) and 1,12,15-triaza-3,4:9,10-dibenzo-5,8-dioxacycloheptadecane(NDOE) were investigated in aqueous solution. The orders of adsorption degree(E) and distribution ratio(D) of transition metal ions were Cu(II)<Ni(II)<Co(II)<Zn(II)<Cd(II)<Pb(II)<Ag(I), the magnitudes were found to be inversely proportional to the hydration free energy of transition metal ions. Also, from the elution curves for Co(II)-Cd(II)-Ag(I), Ni(II)-Cu(II)-Pb(II) and Zn(II)-Cd(II)-Pb(II)-Ag(I) mixed metal solution, the retention times($t_R$) of metal ions were affected by adsorption degree(E) and distribution ratio(D). This results showed good separation efficiency of Ag(I) from mixed metal solution.

Alginate Bead를 이용한 니켈, 아연, 카드뮴의 흡착특성에 관한 연구

정흥조 조선대학교 기초과학연구원 2011 조선자연과학논문집 Vol.4 No.2

This study investigated the adsorption characteristics of nickel, zinc and cadmium ions from the aqueous solution onto the alginate bead. Adsorption equilibrium capacities of the heavy metal ions increased with increasing initial pH of the solution. The adsorption equilibrium isotherm of the heavy metal ions was well represented by Langmuir equation. The magnitude of adsorption capacity of the heavy metal ions onto alginate bead was the order of cadmium > zinc > nickel. Kinetic parameters were measured in a batch adsorber to analyze the adsorption rates of the heavy metal ions. The internal diffusion coefficient of the heavy metal ions in the intraparticle were determined by comparing the experimental concentration curves with those predicted from the surface diffusion model (SDM) and pore diffusion model (PDM). The internal diffusion of the heavy metal ions in the intraparticles was explained by PDM.

Metal-ion Adsorption by Hybrid Gel based on Polyaspartamide and Alginate

Quang Tri Bui(쾅트리뷰),Young Sil Jeon(전영실),Dukjoon Kim(김덕준),Ji-Heung Kim(김지흥) 한국고분자학회 2016 폴리머 Vol.40 No.2

폴리(2-히드록시에틸 아스팔트아미드)(PHEA)와 알지네이트(Alg) 유도체로부터 클릭반응에 의한 가교젤을 제조하고, 이 하이드로젤을 수용액상의 중금속이온 제거를 위한 흡착제로 사용하였다. PHEA/Alg 하이브리드젤은 중금속이온 Cu(II)와 Ni(II)에 대해 각각 75 mg/g과 60 mg/g의 높은 흡착능을 보였다. 하이드로젤은 이온함유 수용액에서 약 60~80 g/g의 수팽윤비를 나타내었다. 흡착 거동에 미치는 접촉시간, pH, 온도, 및 농도의 영향을 조사하였다. SEM과 FTIR을 통해 젤의 다공성 모폴로지 및 금속이온과 고분자 구조간의 상호작용을 고찰하였으며, 또한 농도에 따른 흡착량 데이터로부터 흡착등온선(isotherm)을 이론식에 적용하여 분석하였다. 그 결과로 Cu(II)와 Ni(II)의 흡착거동은 Freundlich보다는 Langmuir 모델에 잘 부합하였으며, 동력학적으로는 유사 2차 동역학적 모델(pseudosecond-order kinetic model)로 더 정확하게 묘사할 수 있음을 알았다. A hydrogel based on poly(2-hydroxyethyl aspartamide) (PHEA) and alginate (Alg) derivatives, prepared by the ‘click’ reaction, has been utilized as a sorbent for the removal of metal-ions from aqueous media. PHEA/Alg hybrid gel exhibited high adsorption capacity for Cu(II) and Ni(II) with 75 and 60 mg/g, respectively. The hybrid gel possessed swelling degrees in the range of 60~80 g/g in ion-containing (2 wt/v%) water. The effects of pH, initial metal-ion concentration, temperature, and contact time, on the adsorption were investigated. The gel morphology and interaction between polymer and metal-ion were characterized by using SEM and FTIR spectroscopy. The kinetics and adsorption isotherms were better fitted to Langmuir model than Freundlich model, and pseudo-second-order adsorption kinetics described well the adsorption process.

Effect of Metal Ions on the Degradation and Adsorption of Two Cellobiohydrolases on Microcrystalline Cellulose

김동원,장영헌,김창석,이남수,Kim, Dong Won,Jang, Yeong Heon,Kim, Chang Seok,Lee, Nam Su Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.7

To test the metal ion effect, hydrolysis experiments for two cellobiohydrolases (CBHⅠ and CBH Ⅱ) from Trichoderma reesei have been carried out in the presence of 10 mM metal ions, such as Cu++, Mn++, Ca++, Hg++, Ba++, Pb++, and Cd++. The addition of Mn++, Ba++, and Ca++(10 mM) during the hydrolysis of Avicel PH 101 caused an increase in the total reducing sugar (TRS) for CBH Ⅰ by 142, 135, and 114 percent, respectively. Those for CBH Ⅱ increased by 177, 175, and 115 percent, respectively. The Mn++ was the most stimulatory metal ion, whereas Hg++ was the most inhibitory metal ion. The adsorption experiments were performed to investigate how the influence of Mn++ and Hg++ on the hydrolysis is related to the adsorption of cellobiohydrolases on cellulose. The increase in TRS during hydrolysis by adding Mn++ caused an increase in adsorption affinity (Kad) and tightness (ΔHa). While, the decrease of TRS during hydrolysis by adding Hg++ caused a decrease in the adsorption affinity (Kad) and tightness (ΔHa). These results indicate the changes in the tightness and affinity of adsorption by adding metal ions play a crucial role in the degradation of the microcrystalline cellulose.

Tough dual-network GAMAAX hydrogel for the efficient removal of cadmium and nickle ions in wastewater treatment applications

Elham Jafarigol,Reza Afshar Ghotli,Arvin Hajipour,Hossein Pahlevani,Mahsa Baghban Salehi 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-

A dual network Poly(Acrylamide-co-Acrylic Acid)/Xanthan Gum (XG) hydrogel incorporated withgraphene oxide (GAMAAX) was synthesized through free radical polymerization method for the removalof heavy metal ions. The GAMAAX hydrogel was characterized by Fourier transform infrared spectrum(FTIR), environmental scanning electron microscope (ESEM), energy dispersive X-ray spectroscopy (EDS)and rheology tests. The adsorption capacity and electrical conductivity of GAMAAX hydrogel wasinvestigated for varying pH range and adsorption dosage by central composite design (CCD) method. Theresults indicated that the heavy metal ion adsorption followed the pseudo-second-order kinetic model,and conformed Freundlich adsorption model with substantial adsorption capacities of 312.15 mg/g and185.0 mg/g for Cd2+ and Ni2+, respectively. In addition to a great single-ion affinity for Cd2+ and Ni2+ ions,it also proved a remarkable dual-ion adsorption capability with the adsorption of 259.25 mg/g and80.75 mg/g Cd2+ and Ni2+, respectively. Moreover, less than 20% reduction in the adsorption capacity afterfour adsorption–desorption cycles, verified the reusability of the GAMAAX hydrogel for the practical andlarge-scale wastewater treatment applications.

The fabrication of the thiol-functionalized cellulose nanofiber membrane for adsorption of heavy metal ions from aqueous solution

정유라,이호익 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-

In this study, a cellulose nanofiber was thiol-functionalized to effectively adsorb heavy metal ions. Thiol was used to functionalize the surface of cellulose nanofibers and subsequent esterification of a thiol precursor molecule. We investigate adsorption mechanism using adsorption isotherms. Adsorption capacity as a function of adsorbate concentration was described well by the with Langmuir isotherm. This result suggests that metal ions form a surface monolayer with a homogenously distributed adsorption energy. The time dependent adsorption capacities followed a pseudo-second-order kinetic model, suggesting that chemisorption of each doubly charged metal ion occurs with two thiol groups on the surface. These results offer the possibility to expand their potential applicability toward water remediation applications and emphasize the importance of surface functionality on sustainable and biocompatible cellulose materials.