Biphasic calcium phosphate (BCP) particle consisting of -tricalcium phosphate and tetracalcium phosphate was synthesized from calcium carbonate and calcium hydrogen phosphate. The Ca/P molar ratio of the product was 1.80. Uni-morphologically controlled BCP particles were synthesized without mixing. (Received Oct 25, 2016; Accepted Jan 23, 2017)
{"title":"PREPARATION AND CHARACTERIZATION OF BIPHASIC CALCIUM PHOSPHATE CONSISTING OF TETRACALCIUM PHOSPHATE AND α-TRICALCIUM PHOSPHATE","authors":"H. Okano, Y. Inomata, S. Nakagawa","doi":"10.3363/PRB.32.14","DOIUrl":"https://doi.org/10.3363/PRB.32.14","url":null,"abstract":"Biphasic calcium phosphate (BCP) particle consisting of -tricalcium phosphate and tetracalcium phosphate was synthesized from calcium carbonate and calcium hydrogen phosphate. The Ca/P molar ratio of the product was 1.80. Uni-morphologically controlled BCP particles were synthesized without mixing. (Received Oct 25, 2016; Accepted Jan 23, 2017)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"201 1","pages":"14-16"},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73954519","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}
Hideko Maeda, Aya Moriwaki, H. Nariai, H. Nakayama
{"title":"TWO SITES PHOSPHONYLATION OF SALICIN WITH DISODIUM DIPHOSPHONATE IN AQUEOUS SOLUTION","authors":"Hideko Maeda, Aya Moriwaki, H. Nariai, H. Nakayama","doi":"10.3363/PRB.32.5","DOIUrl":"https://doi.org/10.3363/PRB.32.5","url":null,"abstract":"","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"1 1","pages":"5-9"},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81775878","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}
{"title":"SYNTHESIS AND CHARACTERIZATION OF Ce(III)-SUBSTITUTED CALCIUM HYDROXYAPATITE PARTICLES BY FORCED HYDROLYSIS OF Ca(OH) 2 -Na 5 P 3 O 10 -CeCl 3 -MIXED SOLUTION","authors":"K. Kandori, M. Mitsui","doi":"10.3363/PRB.30.8","DOIUrl":"https://doi.org/10.3363/PRB.30.8","url":null,"abstract":"","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"3 1","pages":"8-14"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73942952","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}
10 . Abstract: A nickel-sodium triphosphate NiNa 3 P 3 O 10 ·12H 2 O already known has been prepared by the method of ion exchange resin of aqueous chemistry and studied by X-Ray diffraction, thermal analyses (TGA-DTA) and infrared spectrometry which show the characteristic bands of a triphosphate P 3 O 105- . The results of the compound heated at different temperatures showed that, after dehydration, NiNa 3 P 3 O 10 ·12H 2 O decomposes into an amorphous compound, then it crystallizes at 700 °C in order to give the new triphosphate NiNa 3 P 3 O 10 . NiNa 3 P 3 O 10 crystallizes in the hexagonal system, space group P - 3 1 c , Z = 2 with the following unit-cell dimensions: a = b = 13.310(5) Å, c = 9.551(8) Å, M (20) = 80, F (20) = 93 (0.0028; 77) and V = 1465.58(0) Å 3 . NiNa 3 P 3 O 10 is stable until its melting point at 744 °C. Two different methods Ozawa and KAS have been selected in studying the kinetics of thermal behavior of the triphosphate P 3 O 10 for the first time. The kinetic and thermodynamic characteristics of the dehydration of NiNa 3 P 3 O 10 ·12H 2 O and the thermal phenomena accompanying this dehydration were determinated and discussed on the basis of the proposed
10。摘要:采用水化学离子交换树脂法制备了一种已知的三磷酸镍钠NiNa 3p3o10·12h2o，并对其进行了x射线衍射、热分析(TGA-DTA)和红外光谱分析，得到了三磷酸p3o105 -的特征谱带。该化合物在不同温度下加热的结果表明，NiNa 3p3o10·12h2o脱水后分解为无定形化合物，在700℃下结晶生成新型三磷酸盐NiNa 3p3o10。NiNa 3p3o10在空间群P - 31 c, Z = 2的六角形体系中结晶，其晶胞尺寸如下:a = b = 13.310(5) Å， c = 9.551(8) Å， M (20) = 80, F (20) = 93 (0.0028);77)， V = 1465.58(0) Å在熔点为744℃之前，尼娜3p3o10是稳定的。首次采用Ozawa和KAS两种不同的方法研究了三磷酸p3o10的热行为动力学。在此基础上，测定并讨论了NiNa 3p3o10·12h2o脱水的动力学和热力学特性以及脱水过程中的热现象
{"title":"Structural modifications from NiNa3P3O10•12H2O toNiNa3P3O10 new triphosphate during dehydration process","authors":"M. Tridane, I. Fahim, S. Benmokhtar, S. Belaaouad","doi":"10.3363/PRB.30.1","DOIUrl":"https://doi.org/10.3363/PRB.30.1","url":null,"abstract":"10 . Abstract: A nickel-sodium triphosphate NiNa 3 P 3 O 10 ·12H 2 O already known has been prepared by the method of ion exchange resin of aqueous chemistry and studied by X-Ray diffraction, thermal analyses (TGA-DTA) and infrared spectrometry which show the characteristic bands of a triphosphate P 3 O 105- . The results of the compound heated at different temperatures showed that, after dehydration, NiNa 3 P 3 O 10 ·12H 2 O decomposes into an amorphous compound, then it crystallizes at 700 °C in order to give the new triphosphate NiNa 3 P 3 O 10 . NiNa 3 P 3 O 10 crystallizes in the hexagonal system, space group P - 3 1 c , Z = 2 with the following unit-cell dimensions: a = b = 13.310(5) Å, c = 9.551(8) Å, M (20) = 80, F (20) = 93 (0.0028; 77) and V = 1465.58(0) Å 3 . NiNa 3 P 3 O 10 is stable until its melting point at 744 °C. Two different methods Ozawa and KAS have been selected in studying the kinetics of thermal behavior of the triphosphate P 3 O 10 for the first time. The kinetic and thermodynamic characteristics of the dehydration of NiNa 3 P 3 O 10 ·12H 2 O and the thermal phenomena accompanying this dehydration were determinated and discussed on the basis of the proposed","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"76 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80182281","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 dispersion of hydroxyapatite, Ca5(PO4)3OH, HAP, in aqueous systems in the presence of variety of polymers of different composition and ionic charge has been investigated. The dispersion data show that polymer effectiveness as HAP dispersant strongly depends upon polymer architecture. It has been found that phosphonates exhibit poor performance as HAP dispersants. Additionally, it has also been observed that phosphonates exhibit antagonistic effect on the performance of anionic polymeric dispersants. (Received Sep. 30, 2015; Accepted Nov. 30, 2015)
{"title":"HYDROXYAPATITE DISPERSION BY PHOSPHONATES, POLYMERS AND PHOSPHONATE/POLYMER BLENDS","authors":"Z. Amjad, A. Kweik","doi":"10.3363/PRB.30.19","DOIUrl":"https://doi.org/10.3363/PRB.30.19","url":null,"abstract":"The dispersion of hydroxyapatite, Ca5(PO4)3OH, HAP, in aqueous systems in the presence of variety of polymers of different composition and ionic charge has been investigated. The dispersion data show that polymer effectiveness as HAP dispersant strongly depends upon polymer architecture. It has been found that phosphonates exhibit poor performance as HAP dispersants. Additionally, it has also been observed that phosphonates exhibit antagonistic effect on the performance of anionic polymeric dispersants. (Received Sep. 30, 2015; Accepted Nov. 30, 2015)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"92 1","pages":"19-25"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85591691","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}
A. Obata, H. Maeda, Kyosuke Ueda, T. Narushima, T. Kasuga
Phosphate invert glasses (PIGs) containing niobium were prepared by a conventional melt-quenching method and the structures and chemical durability of the glasses and osteoblast-like cell responses to them were examined. Raman and solid state P NMR spectra of the glasses demonstrated that two types of niobate groups, NbO4 and NbO6 units, were contained in the glasses and prepared to combine to pyrophosphate structure than orthophosphate one. The chemical durability in Tris-HCl solution was increased with the increase in the niobium content in the glasses, since niobium replaced to phosphorus and contributed to the formation of P-O-Nb and Nb-O-Nb bonds, which are stronger than P-O-P bond. The niobium ions released from the glasses enhanced the differentiation and mineralization of the cells, rather than the initial adhesion and proliferation. The upregulation of these cell functions by the niobium ions possessed doze-dependence; the medium containing 1 x 10 M of the ions exhibited the highest levels of the cell functions. (Received Jan. 29, 2016; Accepted Feb. 27, 2016)
{"title":"THE ROLE OF NIOBIUM IONS IN CALCIUM PHOSPHATE INVERT GLASSES FOR BONE REGENERATION","authors":"A. Obata, H. Maeda, Kyosuke Ueda, T. Narushima, T. Kasuga","doi":"10.3363/PRB.30.30","DOIUrl":"https://doi.org/10.3363/PRB.30.30","url":null,"abstract":"Phosphate invert glasses (PIGs) containing niobium were prepared by a conventional melt-quenching method and the structures and chemical durability of the glasses and osteoblast-like cell responses to them were examined. Raman and solid state P NMR spectra of the glasses demonstrated that two types of niobate groups, NbO4 and NbO6 units, were contained in the glasses and prepared to combine to pyrophosphate structure than orthophosphate one. The chemical durability in Tris-HCl solution was increased with the increase in the niobium content in the glasses, since niobium replaced to phosphorus and contributed to the formation of P-O-Nb and Nb-O-Nb bonds, which are stronger than P-O-P bond. The niobium ions released from the glasses enhanced the differentiation and mineralization of the cells, rather than the initial adhesion and proliferation. The upregulation of these cell functions by the niobium ions possessed doze-dependence; the medium containing 1 x 10 M of the ions exhibited the highest levels of the cell functions. (Received Jan. 29, 2016; Accepted Feb. 27, 2016)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"5 1","pages":"30-34"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84254932","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}
Hiroya Kubo, A. Miyazaki, Kazunori Kuritani, Masaki Takeuchi, Hideji Tanaka
{"title":"COBALT(III) PRETREATMENT FOR TOTAL PHOSPHORUS DETERMINATION","authors":"Hiroya Kubo, A. Miyazaki, Kazunori Kuritani, Masaki Takeuchi, Hideji Tanaka","doi":"10.3363/PRB.30.26","DOIUrl":"https://doi.org/10.3363/PRB.30.26","url":null,"abstract":"","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"43 1","pages":"26-29"},"PeriodicalIF":0.0,"publicationDate":"2015-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85440820","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}
Fe(III)-treated hydroxyapatite, HAP-300-Fe or HAP-400-Fe, which was prepared by treatment of almost stoichiometric hydroxyapatite HAP-300 or Ca-deficient hydroxyapatite HAP-400 with Fe(III) aqueous solution, was investigated in adsorption of aquatic humic substances, Nordic aquatic humic acid (NHA), Nordic aquatic fulvic acid (NFA), and Suwannee river fulvic acid (SFA), at 25 ̊C for 6 h. HAP-400-Fe indicated higher adsorbability than HAP-300-Fe or the raw hydroxyapatite HAP-400. Further, HAP-400-Fe was investigated as a heterogeneous catalyst in photo-Fenton reaction of NHA, NFA, and SFA at 25 ̊C for 20 h in water. Although all the humic substances were subjected to oxidation or decolorization by catalysis of HAP-400-Fe, the humic substance molecules adsorbed on HAP-400-Fe were slightly degraded and mineralized. This is possibly due to steric hindrance of catalysis by those large adsorbed molecules themselves and/or due to a property to scavenge hydroxyl radicals by Ar-OH groups of those molecules. (Received Nov. 26, 2014; Accepted Dec. 23, 2014)
{"title":"ADSORBABILITY AND PHOTO-FENTON REACTIVITY OF AQUATIC HUMIC SUBSTANCES WITH Fe(III)-TREATED HYDROXYAPATITES IN WATER","authors":"T. Moriguchi, S. Nakagawa","doi":"10.3363/PRB.29.11","DOIUrl":"https://doi.org/10.3363/PRB.29.11","url":null,"abstract":"Fe(III)-treated hydroxyapatite, HAP-300-Fe or HAP-400-Fe, which was prepared by treatment of almost stoichiometric hydroxyapatite HAP-300 or Ca-deficient hydroxyapatite HAP-400 with Fe(III) aqueous solution, was investigated in adsorption of aquatic humic substances, Nordic aquatic humic acid (NHA), Nordic aquatic fulvic acid (NFA), and Suwannee river fulvic acid (SFA), at 25 ̊C for 6 h. HAP-400-Fe indicated higher adsorbability than HAP-300-Fe or the raw hydroxyapatite HAP-400. Further, HAP-400-Fe was investigated as a heterogeneous catalyst in photo-Fenton reaction of NHA, NFA, and SFA at 25 ̊C for 20 h in water. Although all the humic substances were subjected to oxidation or decolorization by catalysis of HAP-400-Fe, the humic substance molecules adsorbed on HAP-400-Fe were slightly degraded and mineralized. This is possibly due to steric hindrance of catalysis by those large adsorbed molecules themselves and/or due to a property to scavenge hydroxyl radicals by Ar-OH groups of those molecules. (Received Nov. 26, 2014; Accepted Dec. 23, 2014)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"15 1","pages":"11-20"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84570467","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}
β-tricalcium phosphate (β-TCP) has a fast rate of bioabsorption, and has been used clinically as bioabsorbant ceramics that is absorbed in vivo and gradually replaced by newly formed bone. Here, we focus on various metal ions with regards to their solid solution substitution in β-TCP, and explain the effects of ion substitution in β-TCP on properties such as structural stability and solubility from a crystal chemistry viewpoint. We also discuss the possibility of metal-ion-subsituted β-TCP materials as hard tissue replacements. (Received Dec. 30, 2014; Accepted Feb. 21, 2015)
{"title":"CONTROL OF BETA-TRICALCIUM PHOSPHATE BIOMATERIAL PROPERTIES BY METAL-ION-SUBSTITUTION","authors":"K. Hashimoto, N. Matsumoto, H. Shibata","doi":"10.3363/PRB.29.21","DOIUrl":"https://doi.org/10.3363/PRB.29.21","url":null,"abstract":"β-tricalcium phosphate (β-TCP) has a fast rate of bioabsorption, and has been used clinically as bioabsorbant ceramics that is absorbed in vivo and gradually replaced by newly formed bone. Here, we focus on various metal ions with regards to their solid solution substitution in β-TCP, and explain the effects of ion substitution in β-TCP on properties such as structural stability and solubility from a crystal chemistry viewpoint. We also discuss the possibility of metal-ion-subsituted β-TCP materials as hard tissue replacements. (Received Dec. 30, 2014; Accepted Feb. 21, 2015)","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"107 1","pages":"21-30"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80778644","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}
Thin films of tricalcium phosphate (TCP) with doping Ti(IV) ion were prepared. These prepared films were characterized by XRD, UV-vis transmission, FT-IT (RAS), and wettability. These characterization indicated that phase separation such as TiO2 did not occur and that substitution with Ti(IV) occurred at Ca site. Photocatalytic activity was evaluated by methylene blue decomposition, and the results suggested that the activity was enhanced by doping Ti(IV). (Received Jan. 16, 2014; Accepted Mar. 5, 2014) INTRODUCTION Previously we have reported preparation of photocatalytic thin film 1 based on a novel apatite Ti-doped calcium hydroxyapatite (TiHAP), 2 which have calcium hydroxyapatite (HAP) structure partially substituted with Ti 4+ ions at calcium sites. This photocatalyst is found to be different from composite systems of TiO2 and an adsorbent (apatite, activated carbon, zeolite, and so on). Yoneyama et al. have revealed that stronger adsorbents lowered the photocatalytic activity of the composite because it prevents migration of adsorbed pollutants on the composite surface. 3 The problem of this composite system is attributable to a distance between photocatalytic site and adsorptive site. However, this apatite-based photocatalyst is not thought to have such problem, and the strong adsorptive ability of apatite may be effectively available. Several groups reported catalytic activities of calcium phosphates such as thermal oxidation reaction of alcohols, trichloroethylene, and so on. 4,5 Nishikawa suggested a possibility of OH radical reactions, 6 that is, OH radical forms thermally at the surface of CP and attacks adsorbed substrates. In the case of TiHAP, it may form photochemically. Doping of metal ion was reported by Suzuki et al 7 and Wakamura et al 8,9 for HAP with many divalent and trivalent metal ions such as Pb 2+ , Sn 2+ , Cu 2+ , Mn 2+ , Ni 2+ , Co 2+ , Al 3+ , La 3+ , Fe 3+ , and Cr 3+ , and Hashimoto et al 10,11 for -TCP for Li + , Na + , K + , Mg 2+ , Sr 2+ , and Al 3+ , for example. In many cases, limits of the concentration for solid solutions are not so high, and especially for TiHAP, it was suggested that the substitution with Ti 4+ was occurred at columnar site probably with a certain amount of Ca-deficiency. 12 For –TCP, the substitution site may depend on radius of doped metal ion. 10 Anyway, doping of metal ion causes changes in lattice constants and perturbation of electronic states, so that it is plausibly expected that doping of metal ions promote photochemical generation of OH radical. As a photocatalytic coating, self-cleaning property is also important. TiO2 photocatalytic coating has been developed as a self-cleaning material, in terms of its photocatalytic activity and photo-induced superhydrophilicity. 13,14 Small amount of water can spread over its surface due to photo-induced superhydrophilicity, which can easily sweep surface stains away. The photocatalytic activity contributes to the self-cleaning property b
{"title":"PREPARATION OF PHOTOCATALYTIC THIN FILMS OF TRICALCIUM PHOSPHATE BY DOPING TITANIUM(IV) ION","authors":"Naoya Yoshida, Y. Nakamura, T. Okura","doi":"10.3363/PRB.29.31","DOIUrl":"https://doi.org/10.3363/PRB.29.31","url":null,"abstract":"Thin films of tricalcium phosphate (TCP) with doping Ti(IV) ion were prepared. These prepared films were characterized by XRD, UV-vis transmission, FT-IT (RAS), and wettability. These characterization indicated that phase separation such as TiO2 did not occur and that substitution with Ti(IV) occurred at Ca site. Photocatalytic activity was evaluated by methylene blue decomposition, and the results suggested that the activity was enhanced by doping Ti(IV). (Received Jan. 16, 2014; Accepted Mar. 5, 2014) INTRODUCTION Previously we have reported preparation of photocatalytic thin film 1 based on a novel apatite Ti-doped calcium hydroxyapatite (TiHAP), 2 which have calcium hydroxyapatite (HAP) structure partially substituted with Ti 4+ ions at calcium sites. This photocatalyst is found to be different from composite systems of TiO2 and an adsorbent (apatite, activated carbon, zeolite, and so on). Yoneyama et al. have revealed that stronger adsorbents lowered the photocatalytic activity of the composite because it prevents migration of adsorbed pollutants on the composite surface. 3 The problem of this composite system is attributable to a distance between photocatalytic site and adsorptive site. However, this apatite-based photocatalyst is not thought to have such problem, and the strong adsorptive ability of apatite may be effectively available. Several groups reported catalytic activities of calcium phosphates such as thermal oxidation reaction of alcohols, trichloroethylene, and so on. 4,5 Nishikawa suggested a possibility of OH radical reactions, 6 that is, OH radical forms thermally at the surface of CP and attacks adsorbed substrates. In the case of TiHAP, it may form photochemically. Doping of metal ion was reported by Suzuki et al 7 and Wakamura et al 8,9 for HAP with many divalent and trivalent metal ions such as Pb 2+ , Sn 2+ , Cu 2+ , Mn 2+ , Ni 2+ , Co 2+ , Al 3+ , La 3+ , Fe 3+ , and Cr 3+ , and Hashimoto et al 10,11 for -TCP for Li + , Na + , K + , Mg 2+ , Sr 2+ , and Al 3+ , for example. In many cases, limits of the concentration for solid solutions are not so high, and especially for TiHAP, it was suggested that the substitution with Ti 4+ was occurred at columnar site probably with a certain amount of Ca-deficiency. 12 For –TCP, the substitution site may depend on radius of doped metal ion. 10 Anyway, doping of metal ion causes changes in lattice constants and perturbation of electronic states, so that it is plausibly expected that doping of metal ions promote photochemical generation of OH radical. As a photocatalytic coating, self-cleaning property is also important. TiO2 photocatalytic coating has been developed as a self-cleaning material, in terms of its photocatalytic activity and photo-induced superhydrophilicity. 13,14 Small amount of water can spread over its surface due to photo-induced superhydrophilicity, which can easily sweep surface stains away. The photocatalytic activity contributes to the self-cleaning property b","PeriodicalId":20022,"journal":{"name":"Phosphorus Research Bulletin","volume":"27 1","pages":"31-35"},"PeriodicalIF":0.0,"publicationDate":"2014-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82260606","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：