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RISS 인기검색어
- 검색키워드
- 저자 : Debasish Mohapatra (검색결과 9 건)
- 무료
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- 유료
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Removal of Arsenic(V) from Aqueous Solutions by Using Natural Minerals
Mohapatra Debasish,Mishra Debaraj,Chaudhury G. Roy,Das R.P.,Park, Kyung-Ho The Korean Institute of Resources Recycling 2006 資源 리싸이클링 Vol.15 No.5
The removal of arsenic(V) using four different natural minerals were evaluated. Parameters like contact time, pH, adsorbent dosages, and As(V) concentration were optimized. The kinetics of adsorption was observed to be fast and reached equilibrium within 2h. As(V) adsorption on studied minerals was dependent on pH and followed a pseudo-second-order reaction model. For kaolin, maximum adsorption was found at pH 5.0. Whereas, in case of other three minerals, a pH range of 6.0-7.0 was found to be the best for As(V) adsorption. The maximum adsorption capacity (Q) was calculated by fitting Langmuir equation to the adsorption isotherms obtained under a specified condition. From the slope of best fit, the Q values were calculated to be 2.07, 2.15, 1.95 and 0.86 mg As(V)/g of bauxite, wad, iron ore and kaolin, respectively. Desorption of As(V) from loaded materials was dependent on the type of leaching reagents used. Based on the results, it was found that among the studied natural minerals, wad was the best As(V) adsorbent.
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Reactive Behavior of Ferrihydrite and Aluminic Ferrihydrite Toward the Adsorption of Arsenate
Debasish Mohapatra,박경호,Debaraj Mishra,G. Roy Chaudhury,R. P. Das 한국자원공학회 2006 Geosystem engineering Vol.9 No.2
The adsorption of arsenate (As(V)) on “ferrihy- drite” prepared by two different methods; “aluminic ferrihydrite” (Fe(III)/Al(III) molar ratio 1:1) and the stability of As(V) bearing materials were investigated. The parameters optimized for adsorption were pH, contact time, adsorbent and As(V) concentration. For leaching study four different leaching reagents (10 mg C/L dissolved organic matter, 0.1M phosphate, 0.1M citrate and 0.1M oxalate) were used. The kinetics of arsenic adsorption on both type of ferrihydrites were similar with an equilibrium time of 1h; whereas, in case of aluminic ferrihydrite the equilibrium time was 3h. For aluminic ferrihydrite, maximum adsorption was found at pH 6.0. Whereas, for ferrihydrites pH 7.0 was found to be the best for As(V) adsorption. The highest As(V) adsorption capacity was shown by aluminic ferrihydrite (21.8 mg/g), followed by ferrihydrite prepared by emulsion method and ferrihydrite prepared by ordinary method (14.9 and 9.8 mg/g, respectively). In case of As(V) extraction from the loaded materials, the pH had a significant effect. In all cases, except citrate for aluminic ferrihydrite, extraction decreased with increasing pH in the range 5.0- 8.0. For oxalate the iron extraction and for citrate the aluminium extraction followed the same trend as that for arsenic as a function of pH, suggesting that dissolution of these metals and consequent release of the adsorbed arsenic is one of the main mechanisms for arsenic extraction. However, for phosphate and DOM, the As(V) extraction mechanism was competition between arsenic and those anions for adsorption sites.
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Reactive Behavior of Ferrihydrite and Aluminic Ferrihydrite Toward the Adsorption of Arsenate
Mohapatra, Debasish,Mishra, Debaraj,Chaudhury, G. Roy,Das, R.P.,Park, Kyung-Ho 한국암반공학회 2006 Geosystem engineering Vol.9 No.2
The adsorption of arsenate (As(V)) on "ferrihydrite" prepared by two different methods; "aluminic ferrihydrite" (Fe(III)/ AI(III) molar ratio 1:1) and the stability of As(V) bearing materials were investigated. The parameters optimized for adsorption were pH, contact time, adsorbent and As(V) concentration. For leaching study four different leaching reagents (10mg C/L dissolved organic matter, 0.1M phosphate, 0.1M citrate and 0.1M oxalate) were used. The kinetics of arsenic adsorption on both type of ferrihydrites were similar with an equilibrium time of 1h; whereas, in case of aluminic ferrihydrite the equilibrium time was 3h. For aluminic ferrihydrite, maximum adsorption was found at pH 6.0. Whereas, for ferrihydrites pH 7.0 was found to be the best for As(V) adsorption. The highest As(V) adsorption capacity was shown by aluminic ferrihydrite (21.8 mg/g), followed by ferrihydrite prepared by emulsion method and ferrihydrite prepared by ordinary method (14.9 and 9.8 mg/g, respectively). In case of As(V) extraction from the loaded materials, the pH had a significant effect. In all cases, except citrate for aluminic ferrihydrite, extraction decreased with increasing pH in the range 5.0-8.0. For oxalate the iron extraction and for citrate the aluminium extraction followed the same trend as that for arsenic as a function of pH, suggesting that dissolution of these metals and consequent release of the adsorbed arsenic is one of the main mechanisms for arsenic extraction. However, for phosphate and DOM, the As(V) extraction mechanism was competition between arsenic and those anions for adsorption sites.
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Debasish Mohapatra,Kyung-Ho Park,Chul-Woo Nam,Hong-In Kim 한국화학공학회 2007 Korean Journal of Chemical Engineering Vol.24 No.5
extraction behaviors of Cu, Ni and Co from a complex matte under different leaching conditions havebeen discussed. The synthetic Cu-Ni-Co-Fe-S matte was prepared by melting the pure metals. The matte contained24.95% Cu, 35.05% Ni, 4.05% Co, 1.45% Fe, 24.5% S, similar composition as is expected to be obtained by reductionsmelting of the Pacific Ocean nodules followed by sulphidisation of the alloy. The diferent phases identified are CuFeS2,CuS2, (FeNi)9S8, (FeNi)S2, Ni9S8, Ni3S2, (CoFeNi)9S8 and Co metal. The merits and demerits of each process of dis-solution i.e., H2SO4/oxygen pressure leaching, atmospheric FeCl3 leaching, NH4OH/(NH4)2SO4 pressure leaching arediscussed in detail. Out of the three, the H2SO4/oxygen presure leaching process is found to be the most suitable withmore than 99% metal extraction efficiency within 1 h of leaching time. From the X-ray difraction analysis, the dif-ferent undissolved phases corresponding to different leaching processes have been identified. The metal extraction effi-ciency decreased in case of atmospheric FeCl3 leaching and NH4OH/(NH4)2SO4 pressure leaching processes due to
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A noble Process to Recover Metal Values from Spent Hydrodesulphurization Catalyst
Park, Kyung-Ho,Debasish, Mohapatra,Nam, Chul-Woo,Kim, Hong-In 한국암반공학회 2008 Geosystem engineering Vol.11 No.1
A combination of pyro- and hydro-metallurgical process has been proposed to selectively recover molybdenum, cobalt and aluminium from the spent hydrodesulphurization catalyst containing 12.3% Mo; 31.8% Al; 2.38% Co; 9.5% S and 2.9% C. Before a two stage alkali-acid leaching process to selectively target Mo, Co and Al from the uncrushed sample, the spent catalyst was roasted at different temperature. Characterizations of different roasted samples were carried out in order to understand the structural changes and dissolution behavior of spent catalyst. Mo was selectively separated and recovered from the leach liquor by carbon adsorption method; whereas, Al and Co were separated by an organo-phosphinic based extractant, Cyanex 272. In the whole process, 95.9% Mo, 89.6% Co and 39.8% Al was recovered from the spent catalyst.
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Biswaranjan Behera,Shashikanta Behera,Shasmita,Debasish Mohapatra,Durga Prasad Barik,Soumendra Kumar Naik 한국식물생명공학회 2021 JOURNAL OF PLANT BIOTECHNOLOGY Vol.48 No.4
Paederia foetida L. is an important medicinal plant that has been used for the treatment of various gastrointestinal related ailments by different tribal commu- nities in India. This plant is also known for its use as a food. Due to overexploitation, P. foetida has been classified as a vulnerable plant in some states of India. The propagation of P. foetida by conventional methods is easy but very slow. Synthetic seed technology offers incredible potential for in vitro propagation of threatened and commercially valuable plants, and can also facilitate the storage and exchange of axenic plant material between laboratories. However, synthetic seed production for P. foetida has not yet been reported. Thus, to the best of our knowledge, the present study is the first attempt to produce synthetic seeds of P. foetida by calcium alginate encapsulation of in vitro regenerated axenic nodal segments. Sodium alginate (3%) and CaCl2 (100 mM) were found to be the optimal materials for the preparation of ideal synthetic seeds, both in terms of morphology and germination ability. The synthetic seeds showed the best germination (formation of both shoot as well as root; 83.3%) on ½ MS medium augmented with 0.5 mg/L indole-3-acetic acid. The plantlets obtained from these synthetic seeds could be successfully acclimatized under field conditions. We also studied the storage of these synthetic seeds at low tem- perature and their subsequent sprouting/germination. The seeds showed a germination rate of 63.3% even after 21 days of storage at 4 °C; thus, they could be useful for transfer and exchange of P. foetida germplasm.
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Kim, Hong In,Wijenayake, Janaka Jayamini,Mohapatra, Debasish,Rout, Pradeep C. Elsevier 2018 Hydrometallurgy Vol.181 No.-
<P><B>Abstract</B></P> <P>The polarization process during LCD manufacturing generates wastewater containing significant amounts of valuable elements such as iodine and boron. The present paper outlines a process to recover iodine value from wastewater using oxidative precipitation followed by a solvent extraction (SX) technique. With H<SUB>2</SUB>O<SUB>2</SUB> as an oxidant, 95% of iodine was precipitated out at a pH of 0.9 from a wastewater bearing 10.2 g/L of iodide and 0.82 g/L of boron. The remaining iodine, which could not be precipitated due to its low concentration, was recovered by SX using xylene as an organic solvent diluted in kerosene. Quantitative extraction and stripping were achieved using 0.05 M xylene and 0.1 M ascorbic acid at O:A ratios of 1:3 and 6:1, respectively. The purity rates of the iodine produced by the precipitation and SX routes were 99.3% and 99.8%, respectively. The highest separation factor achieved by the iodine‑boron system was 28,900 at an equilibrium pH value of 0.5. The present process is economically and environmentally friendly and therefore, can be used as an alternative industrial technique to recover iodine from wastewater.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Process was developed to recover iodine from LCD industry waste water. </LI> <LI> Quantitative recovery of I<SUB>2</SUB> by combination of oxidative precipitation and SX route. </LI> <LI> H<SUB>2</SUB>O<SUB>2</SUB>was used as oxidant for oxidative precipitation of I<SUB>2</SUB>. </LI> <LI> Boron was not precipitated with iodine with the optimized conditions. </LI> <LI> Purity of I<SUB>2</SUB> achieved by SX and precipitation was 99.8% and 99.3%, respectively. </LI> </UL> </P>
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