Ye-Jin Yang, Jung-Ah Kim, Seong-Young Nam, Jin Kim, Ji-Whan Ahn
The objective of this study is to examine the effects of the geological properties of limestone on the synthetic characteristics of precipitated calcium carbonate (PCC) and hydraulic activity. Four groups of limestone samples from eight different limestone deposits according to formation age have been studied. With greater formation age of limestone such as samples from the Paleozoic Ordovician (500~430 million years ago), more calcite twins were presented. Whereas the newest limestone from the Cenozoic Tertiary (65~2 million years ago) had no calcite twins. Furthermore, hydraulic activity and the production yield of aragonite-shaped PCC increased with lower formation age of limestone.
{"title":"Hydraulic Activity and Synthetic Characteristics of Precipitated Calcium Carbonate according to Geological Properties of Limestone","authors":"Ye-Jin Yang, Jung-Ah Kim, Seong-Young Nam, Jin Kim, Ji-Whan Ahn","doi":"10.4144/RPSJ.61.26","DOIUrl":"https://doi.org/10.4144/RPSJ.61.26","url":null,"abstract":"The objective of this study is to examine the effects of the geological properties of limestone on the synthetic characteristics of precipitated calcium carbonate (PCC) and hydraulic activity. Four groups of limestone samples from eight different limestone deposits according to formation age have been studied. With greater formation age of limestone such as samples from the Paleozoic Ordovician (500~430 million years ago), more calcite twins were presented. Whereas the newest limestone from the Cenozoic Tertiary (65~2 million years ago) had no calcite twins. Furthermore, hydraulic activity and the production yield of aragonite-shaped PCC increased with lower formation age of limestone.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76307999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rare metal resources remain after their utilization, which are different from energy resources. We have a lot of industrial wastes, that is, urban mine in Japan. It is important to recycle valuable rare metals from the industrial wastes by applying suitable separation technologies. The contents of rare metals are usually higher than those of natural resources. They could be used without mining from the ground, though it is necessary to collect a certain amount. The importance of rare metal recycling is discussed here from the various aspects.
{"title":"Rare Metals and Possibility for Recycling","authors":"S. Nishimura, J. Shibata, M. Sano","doi":"10.4144/RPSJ.61.83","DOIUrl":"https://doi.org/10.4144/RPSJ.61.83","url":null,"abstract":"Rare metal resources remain after their utilization, which are different from energy resources. We have a lot of industrial wastes, that is, urban mine in Japan. It is important to recycle valuable rare metals from the industrial wastes by applying suitable separation technologies. The contents of rare metals are usually higher than those of natural resources. They could be used without mining from the ground, though it is necessary to collect a certain amount. The importance of rare metal recycling is discussed here from the various aspects.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89359466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Manabe, A. Fuji, Tasuma Suzuki, Masakazu Niinae, J. Shibata
Catalysts are widely used in petroleum refining and chemical industries. Hydrodesulphurization (HDS) catalysts account for about one third of the total worldwide catalyst consumption. Spent HDS catalysts contain rare metals such as molybdenum, vanadium, nickel and cobalt on an alumina carrier. Among secondary resources, spent HDS catalysts are regarded the most important catalysts for recycling these metals due to not only their large amounts and economic values, but also the environmental concerns if disposed of. In most cases, spent catalysts are treated with hydrometal lurgical leaching processes such as caustic leaching and acid leaching with roasting as a pre-treatment step. In the alka line leaching processes such as sodium carbonate roasting followed by water leaching, most of the molybdenum and vanadium are selectively leached and most of nickel and cobalt are left in the residue after the alkaline leaching of spent HDS catalysts. Therefore, it is important to recover nickel and cobalt from the residue. The main form of nickel and co - balt in the residue is spinel, therefore, it is difficult to extract nickel and cobalt from the residue using mineral acids. In the present study, the effect of grinding, acid concentration, leaching temperature and stirring speed on the leaching efficiency of nickel and cobalt from the residue after sodium carbonate roasting followed by water leaching of spent HDS catalysts with sulfuric acid was investigated. The grinding, sulfuric acid concentration and leaching temper ature significantly affected the leaching efficiency of nickel, cobalt and aluminum. However, the extraction of nickel and cobalt was ca. 80% and ca. 60%, respectively. The spinel was not affected by only mechanical grinding, therefore, it was considered that the extraction of nickel and cobalt was relatively low.
{"title":"Sulfuric Acid Leaching Behavior of Nickel, Cobalt and Aluminum from Alkaline Leaching Residue of Spent Hydrodesulphurization Catalysts","authors":"K. Manabe, A. Fuji, Tasuma Suzuki, Masakazu Niinae, J. Shibata","doi":"10.4144/RPSJ.61.170","DOIUrl":"https://doi.org/10.4144/RPSJ.61.170","url":null,"abstract":"Catalysts are widely used in petroleum refining and chemical industries. Hydrodesulphurization (HDS) catalysts account for about one third of the total worldwide catalyst consumption. Spent HDS catalysts contain rare metals such as molybdenum, vanadium, nickel and cobalt on an alumina carrier. Among secondary resources, spent HDS catalysts are regarded the most important catalysts for recycling these metals due to not only their large amounts and economic values, but also the environmental concerns if disposed of. In most cases, spent catalysts are treated with hydrometal lurgical leaching processes such as caustic leaching and acid leaching with roasting as a pre-treatment step. In the alka line leaching processes such as sodium carbonate roasting followed by water leaching, most of the molybdenum and vanadium are selectively leached and most of nickel and cobalt are left in the residue after the alkaline leaching of spent HDS catalysts. Therefore, it is important to recover nickel and cobalt from the residue. The main form of nickel and co - balt in the residue is spinel, therefore, it is difficult to extract nickel and cobalt from the residue using mineral acids. In the present study, the effect of grinding, acid concentration, leaching temperature and stirring speed on the leaching efficiency of nickel and cobalt from the residue after sodium carbonate roasting followed by water leaching of spent HDS catalysts with sulfuric acid was investigated. The grinding, sulfuric acid concentration and leaching temper ature significantly affected the leaching efficiency of nickel, cobalt and aluminum. However, the extraction of nickel and cobalt was ca. 80% and ca. 60%, respectively. The spinel was not affected by only mechanical grinding, therefore, it was considered that the extraction of nickel and cobalt was relatively low.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78829164","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
the pH, resulting in the precipitation of heavy metal pollutants 11 . Arsenate (As(V)) and arsenite (As(III)), which are the predominant in-organic arsenic species present in natural aquatic Abstract As(V) removal mechanism using Fe(III)-supported ion exchange resins was elucidated by adsorption isotherms and X-ray absorption fine structure spectroscopy. Fe(III) substituted almost all counter ions in the resin at pH 2 during 1-h reaction; the Langmuir exchange capacity was 1.87 mmol Fe/g-resin. The Fe(III)-supported resin comprised ≈65% Fe(III) and ≈35% ferrihydrite. Under pH 3 and arsenic concentration of 10 mg/dm 3 conditions, a sorption density of 0.035 mmol As/g-resin was obtained after 1-h reaction, and increased to 0.74 mmol As/g-resin after 120-h reaction. As(V) remov al proceeded mainly via surface precipitation of poorly crystalline ferric arsenate via co-precipitation between As(V) and Fe(III); also, some As(V) adsorbed on ferrihydrite.
{"title":"Mechanism of As(V) Removal in Wastewater Treatment Using Fe(III)-Supported Exchange Resins","authors":"F. Futami, C. Tokoro, Sayaka Izawa, S. Owada","doi":"10.4144/RPSJ.61.3","DOIUrl":"https://doi.org/10.4144/RPSJ.61.3","url":null,"abstract":"the pH, resulting in the precipitation of heavy metal pollutants 11 . Arsenate (As(V)) and arsenite (As(III)), which are the predominant in-organic arsenic species present in natural aquatic Abstract As(V) removal mechanism using Fe(III)-supported ion exchange resins was elucidated by adsorption isotherms and X-ray absorption fine structure spectroscopy. Fe(III) substituted almost all counter ions in the resin at pH 2 during 1-h reaction; the Langmuir exchange capacity was 1.87 mmol Fe/g-resin. The Fe(III)-supported resin comprised ≈65% Fe(III) and ≈35% ferrihydrite. Under pH 3 and arsenic concentration of 10 mg/dm 3 conditions, a sorption density of 0.035 mmol As/g-resin was obtained after 1-h reaction, and increased to 0.74 mmol As/g-resin after 120-h reaction. As(V) remov al proceeded mainly via surface precipitation of poorly crystalline ferric arsenate via co-precipitation between As(V) and Fe(III); also, some As(V) adsorbed on ferrihydrite.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81643963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Four types of layered double hydroxides (LDHs) were synthesized by a co-precipitation method. The ability of various LDHs to remove anionic species including As(III), As(V), B, Cr(VI) and Se(IV) was investigated. Removal tests were performed primarily by a batch operation. The Cr(VI) removal was conducted by both batch and column studies. For the column removal tests, LDH pellets were prepared using a granulator and 5% poly-vinyl alcohol solution as binder. Among the LDHs tested, Mg-Al-NO 3 − LDH showed the optimal removal of anionic species, and it demonstrated excellent removal of As(V), Se(IV) and Cr(VI) particularly at the low anionic con- centrations. The order of anionic removal by the LDHs is as follows; Mg-Al-NO 3 − LDH > Mg-Al-Cl − LDH >> Mg-Al-SO 42 − LDH > Mg-Al-CO 32 − LDH. The selective uptake of anion had the following order; As(V) > Se(IV) > Cr(VI) > As(III) > B. This study has demonstrated the uptake of harmful anions is influenced by the two specific factors, (1) the originally intercalated anions in the LDH, and (2) valency of anionic target species in aqueous solution. Column study also demonstrated that about 350 times Cr(VI) in solution per unit volume of LDH pellet can be removed, though this resulted in minor change in pH of the solution and greater NO 3 − elution. This study has revealed the ability of LDH to remove harmful anionic species and its practical application in wastewater treat- ment.
{"title":"Removal of Harmful Anions in Aqueous Solution with Various Layered Double Hydroxides","authors":"N. Murayama, D. Sakamoto, J. Shibata, M. Valix","doi":"10.4144/RPSJ.60.131","DOIUrl":"https://doi.org/10.4144/RPSJ.60.131","url":null,"abstract":"Four types of layered double hydroxides (LDHs) were synthesized by a co-precipitation method. The ability of various LDHs to remove anionic species including As(III), As(V), B, Cr(VI) and Se(IV) was investigated. Removal tests were performed primarily by a batch operation. The Cr(VI) removal was conducted by both batch and column studies. For the column removal tests, LDH pellets were prepared using a granulator and 5% poly-vinyl alcohol solution as binder. Among the LDHs tested, Mg-Al-NO 3 − LDH showed the optimal removal of anionic species, and it demonstrated excellent removal of As(V), Se(IV) and Cr(VI) particularly at the low anionic con- centrations. The order of anionic removal by the LDHs is as follows; Mg-Al-NO 3 − LDH > Mg-Al-Cl − LDH >> Mg-Al-SO 42 − LDH > Mg-Al-CO 32 − LDH. The selective uptake of anion had the following order; As(V) > Se(IV) > Cr(VI) > As(III) > B. This study has demonstrated the uptake of harmful anions is influenced by the two specific factors, (1) the originally intercalated anions in the LDH, and (2) valency of anionic target species in aqueous solution. Column study also demonstrated that about 350 times Cr(VI) in solution per unit volume of LDH pellet can be removed, though this resulted in minor change in pH of the solution and greater NO 3 − elution. This study has revealed the ability of LDH to remove harmful anionic species and its practical application in wastewater treat- ment.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73992625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Masakazu Niinae, Tasuma Suzuki, A. Fuji, Nanae Matsunaga, J. Shibata
Catalysts are widely used in petroleum refining and chemical industries. Hydrodesulphurization (HDS) catalysts account for about one third of the total worldwide catalyst consumption. Spent HDS catalysts contain rare metals such as molybdenum, vanadium, nickel and cobalt on an alumina carrier. Among secondary resources, spent HDS catalysts are regarded the most important catalysts for recycling these metals due to not only their large amounts and economic values, but also the environmental concerns if disposed off. In most cases, spent catalysts are treated with hydromet- allurgical leaching processes such as caustic leaching and acid leaching with roasting as a pre-treatment step. In the alkaline leaching processes, most of the molybdenum and vanadium are selectively leached over aluminum, nickel and cobalt. Vanadium can be separated from molybdenum with a two stage process based on solvent extraction and precipitation stripping. Molybdenum and vanadium are simultaneously extracted with tri-n-octylamine (TOA) at around pH 4 followed by stripping of molybdenum and vanadium with ammonium salt solutions. In the stripping process, vanadium alone is precipitated as ammonium salts of tetraammonium disodium decavanadate decahydrate at pH > 8. In the present study, precipitation method was carried out to recovery of molybdenum from aqueous solutions of ammonium chloride. Molybdenum could be precipitated as tetraammonium octamolybdate pentahydrate with ammo- nium chloride at the pH below 4 and the pH region of precipitation increased with increase of temperature. And also, the precipitation of molybdenum with barium chloride and calcium chloride was also investigated.
{"title":"A Study on Precipitation Recovery of Molybdenum from Aqueous Solutions of Ammonium Chloride","authors":"Masakazu Niinae, Tasuma Suzuki, A. Fuji, Nanae Matsunaga, J. Shibata","doi":"10.4144/RPSJ.60.151","DOIUrl":"https://doi.org/10.4144/RPSJ.60.151","url":null,"abstract":"Catalysts are widely used in petroleum refining and chemical industries. Hydrodesulphurization (HDS) catalysts account for about one third of the total worldwide catalyst consumption. Spent HDS catalysts contain rare metals such as molybdenum, vanadium, nickel and cobalt on an alumina carrier. Among secondary resources, spent HDS catalysts are regarded the most important catalysts for recycling these metals due to not only their large amounts and economic values, but also the environmental concerns if disposed off. In most cases, spent catalysts are treated with hydromet- allurgical leaching processes such as caustic leaching and acid leaching with roasting as a pre-treatment step. In the alkaline leaching processes, most of the molybdenum and vanadium are selectively leached over aluminum, nickel and cobalt. Vanadium can be separated from molybdenum with a two stage process based on solvent extraction and precipitation stripping. Molybdenum and vanadium are simultaneously extracted with tri-n-octylamine (TOA) at around pH 4 followed by stripping of molybdenum and vanadium with ammonium salt solutions. In the stripping process, vanadium alone is precipitated as ammonium salts of tetraammonium disodium decavanadate decahydrate at pH > 8. In the present study, precipitation method was carried out to recovery of molybdenum from aqueous solutions of ammonium chloride. Molybdenum could be precipitated as tetraammonium octamolybdate pentahydrate with ammo- nium chloride at the pH below 4 and the pH region of precipitation increased with increase of temperature. And also, the precipitation of molybdenum with barium chloride and calcium chloride was also investigated.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74137783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Spent zinc-carbon batteries and alkaline batteries contain manganese dioxide, but they are bur- ied in landfill sites without being recycled in Japan. Manganese dioxide is nobler than metal copper. The contact between both materials causes galvanic interactions, and manganese dioxide acts cath- ode to be reduced while copper reacts as anode to be oxidized. We have investigated the galvanic leaching of copper in shredded printed circuit boards using manganese dioxide recovered from spent zinc-carbon batteries. The dissolution of copper was enhanced in the presence of manganese dioxide in sulfuric acid solution with pH 1.0. The extraction yield of copper was 90% in the presence of manganese dioxide in 8 hour leaching while 16% of copper dissolved in the absence. Effects of fac-tors such as pH, amount of manganese dioxide and temperature on the leaching of copper were also examined.
{"title":"Galvanic Leaching of Copper in Waste Printed Circuit Boards Using Manganese Dioxide in Spent Zinc-Carbon Batteries","authors":"H. Nakazawa, Naofumi Hayashi, Wataru Hareyama","doi":"10.4144/RPSJ.60.174","DOIUrl":"https://doi.org/10.4144/RPSJ.60.174","url":null,"abstract":"Spent zinc-carbon batteries and alkaline batteries contain manganese dioxide, but they are bur- ied in landfill sites without being recycled in Japan. Manganese dioxide is nobler than metal copper. The contact between both materials causes galvanic interactions, and manganese dioxide acts cath- ode to be reduced while copper reacts as anode to be oxidized. We have investigated the galvanic leaching of copper in shredded printed circuit boards using manganese dioxide recovered from spent zinc-carbon batteries. The dissolution of copper was enhanced in the presence of manganese dioxide in sulfuric acid solution with pH 1.0. The extraction yield of copper was 90% in the presence of manganese dioxide in 8 hour leaching while 16% of copper dissolved in the absence. Effects of fac-tors such as pH, amount of manganese dioxide and temperature on the leaching of copper were also examined.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79330177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. Shimizu, K. Omura, Y. Kitamura, H. Onoda, K. Nagata
This paper aims at evaluating the efficacy of LFS (Liquid Feeding System) which feeds shochu distillery byproduct as liquid feed in a pig farm from a perspective of CO2 emission. Specifically, by obtaining the survey data in the business (brewing manufacturer, pig farm) which adopted LFS in Kagoshima Prefecture, the comparison with the other processes such as the formation of dried feed mainly used in the feed-producing technique, was performed. As a result, it was found that the CO2 emission per pig was reduced 3% as compared with the case where the usual formula feed was used, and the CO2 emission per pig was reduced 18% as compared with the case where the same amount of shochu distillery by-product was made into dried feed. Furthermore, while confirmed that it has an economic advantage over the other processes of feed formation, it was objectively shown that this is a mechanism which is beneficial to both brewing manufacturers and pig farms.
{"title":"Environmental Impact Assessment for Various Feed Processes of Shochu Distillery By-product","authors":"K. Shimizu, K. Omura, Y. Kitamura, H. Onoda, K. Nagata","doi":"10.4144/RPSJ.60.72","DOIUrl":"https://doi.org/10.4144/RPSJ.60.72","url":null,"abstract":"This paper aims at evaluating the efficacy of LFS (Liquid Feeding System) which feeds shochu distillery byproduct as liquid feed in a pig farm from a perspective of CO2 emission. Specifically, by obtaining the survey data in the business (brewing manufacturer, pig farm) which adopted LFS in Kagoshima Prefecture, the comparison with the other processes such as the formation of dried feed mainly used in the feed-producing technique, was performed. As a result, it was found that the CO2 emission per pig was reduced 3% as compared with the case where the usual formula feed was used, and the CO2 emission per pig was reduced 18% as compared with the case where the same amount of shochu distillery by-product was made into dried feed. Furthermore, while confirmed that it has an economic advantage over the other processes of feed formation, it was objectively shown that this is a mechanism which is beneficial to both brewing manufacturers and pig farms.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79899665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bis[(N-ethylaminomethyl)-2-pyridine]amino-silica (BEPS) and bis[(N-propylaminomethyl)-2-pyridine]aminosilica (BPPS) as adsorbents have been synthesizing by the sol-gel process. The adsorption experiments were carried out by a bath method. The adsorption ability of palladium(II) on BEPS was higher than that of BPPS whereas adsorption ability of gold(III) on BPPS was higher than that on BEPS. The thermodynamic parameters showed that entropy change of palladium(II) on BEPS was higher than that on BPPS and gold(III) on BPPS was higher than that of BEPS. These indicate that BEPS and BPPS formed high stable chelating complexes with palladium(II) and gold(III), respectively. While the thermodynamic parameters and adsorption rate constants of platinum(IV) on BPPS indicated that the platinum(IV) adsorption on BPPS is due to an electrostatic interaction.
{"title":"Synthesis of Silicas with Amino Moieties and their Adsorption Properties of Precious Metal Ions in Hydrochloric Acid","authors":"Y. Sasaki, T. Oshima, Y. Baba","doi":"10.4144/RPSJ.60.145","DOIUrl":"https://doi.org/10.4144/RPSJ.60.145","url":null,"abstract":"Bis[(N-ethylaminomethyl)-2-pyridine]amino-silica (BEPS) and bis[(N-propylaminomethyl)-2-pyridine]aminosilica (BPPS) as adsorbents have been synthesizing by the sol-gel process. The adsorption experiments were carried out by a bath method. The adsorption ability of palladium(II) on BEPS was higher than that of BPPS whereas adsorption ability of gold(III) on BPPS was higher than that on BEPS. The thermodynamic parameters showed that entropy change of palladium(II) on BEPS was higher than that on BPPS and gold(III) on BPPS was higher than that of BEPS. These indicate that BEPS and BPPS formed high stable chelating complexes with palladium(II) and gold(III), respectively. While the thermodynamic parameters and adsorption rate constants of platinum(IV) on BPPS indicated that the platinum(IV) adsorption on BPPS is due to an electrostatic interaction.","PeriodicalId":20971,"journal":{"name":"Resources Processing","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90985313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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