start-ver=1.4 cd-journal=joma no-vol=592 cd-vols= no-issue= article-no= start-page=121751 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2022 dt-pub=20220915 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Effect of bond valence sum on the structural modeling of lead borate glass en-subtitle= kn-subtitle= en-abstract= kn-abstract=The structural model of 66.7PbO-33.3B2O3 glass was constructed using a reverse Monte Carlo (RMC) method, in which bond valence sum (BVS) was added as a constraint condition to suppress formation of unrealistic local structures. Based on the crystal structures, the optimal BVS calculating conditions were determined. As a result, BVS distributions with small deviation were successfully achieved without lowering the reproducibility of other experimental constraints. The geometric asymmetry of PbOn polyhedra was evaluated from the eccentric distance between Pb and gravity center of oxygen atoms. The average eccentric distance was shorter than that in the lead borate crystals, indicating less asymmetry of PbOn units in the RMC glass model. The connectivity between BOn and PbOn units was investigated. It was consequently concluded that the glass had a different network structure from the crystal with the same composition, which might be due to the different chemical bonding character between the lead borate glasses and crystals. en-copyright= kn-copyright= en-aut-name=NagaoMasaaki en-aut-sei=Nagao en-aut-mei=Masaaki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=SakidaShinichi en-aut-sei=Sakida en-aut-mei=Shinichi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=BeninoYasuhiko en-aut-sei=Benino en-aut-mei=Yasuhiko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=NanbaTokuro en-aut-sei=Nanba en-aut-mei=Tokuro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=MukunokiAtsushi en-aut-sei=Mukunoki en-aut-mei=Atsushi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=ChibaTamotsu en-aut-sei=Chiba en-aut-mei=Tamotsu kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=KikuchiTakahiro en-aut-sei=Kikuchi en-aut-mei=Takahiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=SakuragiTomofumi en-aut-sei=Sakuragi en-aut-mei=Tomofumi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 ORCID= en-aut-name=OwadaHitoshi en-aut-sei=Owada en-aut-mei=Hitoshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=9 ORCID= affil-num=1 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=2 en-affil=Environmental Management Center, Okayama University kn-affil= affil-num=3 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=4 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=5 en-affil=JGC Japan Corporation kn-affil= affil-num=6 en-affil=JGC Japan Corporation kn-affil= affil-num=7 en-affil=JGC Japan Corporation kn-affil= affil-num=8 en-affil=Radioactive Waste Management Funding and Research Center kn-affil= affil-num=9 en-affil=Radioactive Waste Management Funding and Research Center kn-affil= en-keyword=Lead borate glass kn-keyword=Lead borate glass en-keyword=Reverse Monte Carlo modeling kn-keyword=Reverse Monte Carlo modeling en-keyword=Bond valence sum kn-keyword=Bond valence sum en-keyword=Coordination polyhedron kn-keyword=Coordination polyhedron END start-ver=1.4 cd-journal=joma no-vol=130 cd-vols= no-issue=8 article-no= start-page=605 end-page=610 dt-received= dt-revised= dt-accepted= dt-pub-year=2022 dt-pub=202281 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Environmental activities on glass in Japan en-subtitle= kn-subtitle= en-abstract= kn-abstract=In general, glass has been recognized as an environmentally friendly material. However, the production of glass requires a lot of heat energy, and the raw materials also emit CO2 at the melting process. In fact, commercial glasses are not easy to recycle. In glass industry of Japan, various efforts have been made so far to reduce the environmental impact of glass. In this paper, not only glass manufacturing technologies but also glass recycling technologies were reviewed, and the future glass production technologies to achieve carbon neutrality were also introduced. en-copyright= kn-copyright= en-aut-name=NanbaTokuro en-aut-sei=Nanba en-aut-mei=Tokuro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=BeninoYasuhiko en-aut-sei=Benino en-aut-mei=Yasuhiko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=AkaiTomoko en-aut-sei=Akai en-aut-mei=Tomoko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= affil-num=1 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=2 en-affil=Graduate School of Environmental and Life Science, Okayama University kn-affil= affil-num=3 en-affil=National Institute of Advanced Industrial Science and Technology (AIST) kn-affil= END start-ver=1.4 cd-journal=joma no-vol=37 cd-vols= no-issue= article-no= start-page=3 end-page=15 dt-received= dt-revised= dt-accepted= dt-pub-year=2016 dt-pub=201602 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=平成27 年度環境管理センター公開講演会「地球温暖化と気候変動が関わるリスク」 en-subtitle= kn-subtitle= en-abstract= kn-abstract= en-copyright= kn-copyright= en-aut-name=BeninoYasuhiko en-aut-sei=Benino en-aut-mei=Yasuhiko kn-aut-name=紅野安彦 kn-aut-sei=紅野 kn-aut-mei=安彦 aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=環境生命科学研究科 END start-ver=1.4 cd-journal=joma no-vol=19 cd-vols= no-issue=1 article-no= start-page=22 end-page=25 dt-received= dt-revised= dt-accepted= dt-pub-year=2014 dt-pub=201403 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Material design for the ceramics coating with high mold releasability by using molecular orbital calculations kn-title=分子軌道計算による高い離型性を有するセラミックスコーティングの材料設計 en-subtitle= kn-subtitle= en-abstract= kn-abstract= To explore the ceramic materials appropriate for the coatings with high mold releasability, molecular orbital (MO) calculations have been applied to the ceramics with NaCl structure, such as TiN, TiC, CrN, etc. Chemical bonding characters were evaluated based on the MO calculations, which were correlated to the experimental surface free energy. The dispersion and polar components of surface free energy indicated high correlation with the bond overlap population of the surface bonds and the net charge of inside atoms of the cluster models, respectively. Among the ceramic materials investigated, MoN had the lowest surface free energy, being expected to be most suitable as the ceramic coating material with high releasability en-copyright= kn-copyright= en-aut-name=NanbaTokuro en-aut-sei=Nanba en-aut-mei=Tokuro kn-aut-name=難波徳郎 kn-aut-sei=難波 kn-aut-mei=徳郎 aut-affil-num=1 ORCID= en-aut-name=FujiharaJiro en-aut-sei=Fujihara en-aut-mei=Jiro kn-aut-name=藤原二朗 kn-aut-sei=藤原 kn-aut-mei=二朗 aut-affil-num=2 ORCID= en-aut-name=SakidaShinichi en-aut-sei=Sakida en-aut-mei=Shinichi kn-aut-name=崎田真一 kn-aut-sei=崎田 kn-aut-mei=真一 aut-affil-num=3 ORCID= en-aut-name=BeninoYasuhiko en-aut-sei=Benino en-aut-mei=Yasuhiko kn-aut-name=紅野安彦 kn-aut-sei=紅野 kn-aut-mei=安彦 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=岡山大学環境理工学部環境物質工学科 affil-num=2 en-affil= kn-affil=岡山大学環境理工学部環境物質工学科 affil-num=3 en-affil= kn-affil=岡山大学環境管理センター affil-num=4 en-affil= kn-affil=岡山大学環境理工学部環境物質工学科 en-keyword=Material design kn-keyword=Material design en-keyword=Ceramic coating kn-keyword=Ceramic coating en-keyword=Releasability kn-keyword=Releasability en-keyword=Molecular orbital calculation kn-keyword=Molecular orbital calculation END start-ver=1.4 cd-journal=joma no-vol=1 cd-vols= no-issue=1 article-no= start-page=108 end-page=113 dt-received= dt-revised= dt-accepted= dt-pub-year=2013 dt-pub=201303 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Distribution behavior of inorganic constituents in chemical recycling processes of a municipal waste slag en-subtitle= kn-subtitle= en-abstract= kn-abstract= en-copyright= kn-copyright= en-aut-name=OmuraKohei en-aut-sei=Omura en-aut-mei=Kohei kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=SakidaShinichi en-aut-sei=Sakida en-aut-mei=Shinichi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=BeninoYasuhiko en-aut-sei=Benino en-aut-mei=Yasuhiko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=NanbaTokuro en-aut-sei=Nanba en-aut-mei=Tokuro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Graduate School of Environmental Science, Okayama University affil-num=2 en-affil= kn-affil=Environmental Management Center, Okayama University affil-num=3 en-affil= kn-affil=Graduate School of Environmental Science, Okayama University affil-num=4 en-affil= kn-affil=Graduate School of Environmental Science, Okayama University en-keyword=Chemical recycling of wastes kn-keyword=Chemical recycling of wastes en-keyword=Glass kn-keyword=Glass en-keyword=Phase separation kn-keyword=Phase separation en-keyword=Dissolution–reprecipitation kn-keyword=Dissolution–reprecipitation en-keyword=Elemental mapping kn-keyword=Elemental mapping END start-ver=1.4 cd-journal=joma no-vol=33 cd-vols= no-issue= article-no= start-page=6 end-page=12 dt-received= dt-revised= dt-accepted= dt-pub-year=2012 dt-pub=201202 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Material recycling of inorganic slag by wet ball milling kn-title=湿式ボールミル法を用いた無機性産業廃棄物の再資源化技術の開発 en-subtitle= kn-subtitle= en-abstract= kn-abstract=The possibility of material recycling of inorganic slag by wet ball milling with distilled water and an ethylenediaminetetraacetic acid disodium salt dehydrate (EDTA·2Na·2H2O) reagent was investigated. The wet ball milling of the simulated waste slag powder was performed using a ball mill pot and balls in air for 10 - 100 h at room temperature with the rotational speed fixed at 200 rpm. The fractions of CaO and Fe2O3 in the specimens obtained by wet-ball-milling the simulated waste slag powder decreased, that of SiO2 increased, and those of Al2O3 and Na2O hardly changed. These specimens contained 0.1 – 0.8mass% ZrO2. Appropriate solution and time for wet ball milling were 300 ml distilled water and 20 h, respectively. When the wet ball milling of the simulated waste slag powder was performed twice, the fractions of CaO, Al2O3 and Fe2O3 in the specimen obtained after repeated wet ball milling decreased, those of SiO2 and ZrO2 increased and that of Na2O hardly changed in comparison with those in the specimen wet-ball-milled once. The insoluble end product obtained by soaking the specimen wet-ball-milled once in 6M HCl for 20 hours was composed of 98.5mass% SiO2 and 0.6mass% or less other oxides and is usable as glass material. en-copyright= kn-copyright= en-aut-name=SakidaShinichi en-aut-sei=Sakida en-aut-mei=Shinichi kn-aut-name=崎田真一 kn-aut-sei=崎田 kn-aut-mei=真一 aut-affil-num=1 ORCID= en-aut-name=BeninoYasuhiko en-aut-sei=Benino en-aut-mei=Yasuhiko kn-aut-name=紅野安彦 kn-aut-sei=紅野 kn-aut-mei=安彦 aut-affil-num=2 ORCID= en-aut-name=NanbaTokuro en-aut-sei=Nanba en-aut-mei=Tokuro kn-aut-name=難波徳郎 kn-aut-sei=難波 kn-aut-mei=徳郎 aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=岡山大学環境管理センター affil-num=2 en-affil= kn-affil=岡山大学環境理工学部環境物質工学科 affil-num=3 en-affil= kn-affil=岡山大学環境理工学部環境物質工学科 en-keyword=Inorganic slag kn-keyword=Inorganic slag en-keyword=EDTA kn-keyword=EDTA en-keyword=Wet ball milling kn-keyword=Wet ball milling en-keyword=Recycling kn-keyword=Recycling END start-ver=1.4 cd-journal=joma no-vol=117 cd-vols= no-issue=1371 article-no= start-page=1195 end-page=1198 dt-received= dt-revised= dt-accepted= dt-pub-year=2009 dt-pub=200911 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Chemical recycling of municipal waste slag by using phase separation en-subtitle= kn-subtitle= en-abstract= kn-abstract=A chemical recycling method by using phase separation was applied to municipal waste slags. Glasses were prepared from incineration ash and ash-melted slag, where B(2)O(3) was added to promote phase separation. The glasses were heat-treated at temperatures higher than their glass transition temperatures, and they were soaked in hydrochloric acid, leaching CaO, Fe(2)O(3), K(2)O, and S. Transparent and colorless solids containing ca. 80 mass% of SiO(2) were successfully obtained as residues. It was suggested that phase separation took place not in the heat-treatment but in the vitrification process, and further characterizations are however required to investigate the phenomena at microscopic levels in the recycling processes. en-copyright= kn-copyright= en-aut-name=NanbaTokuro en-aut-sei=Nanba en-aut-mei=Tokuro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=KurodaYutaro en-aut-sei=Kuroda en-aut-mei=Yutaro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=SakidaShinichi en-aut-sei=Sakida en-aut-mei=Shinichi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=BeninoYasuhiko en-aut-sei=Benino en-aut-mei=Yasuhiko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Graduate School of Environmental Science, Okayama University affil-num=2 en-affil= kn-affil=Faculty of Environmental Science and Technology, Okayama University affil-num=3 en-affil= kn-affil=Environmental Management Center, Okayama University affil-num=4 en-affil= kn-affil=Graduate School of Environmental Science, Okayama University en-keyword=Municipal waste slag kn-keyword=Municipal waste slag en-keyword=Waste recycling kn-keyword=Waste recycling en-keyword=Chemical recycling kn-keyword=Chemical recycling en-keyword=Glass kn-keyword=Glass END start-ver=1.4 cd-journal=joma no-vol=118 cd-vols= no-issue=1379 article-no= start-page=603 end-page=607 dt-received= dt-revised= dt-accepted= dt-pub-year=2010 dt-pub=201007 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Phase separation of borosilicate glass containing sulfur en-subtitle= kn-subtitle= en-abstract= kn-abstract=A 10Na(2)S·30B(2)O(3)·60SiO(2) (mol %) glass was prepared, and the changes in glass structure and chemical state of sulfur caused by phase separation were investigated. In the as-prepared and heat-treated glasses, sulfur was present as S(2)− anion and polysulfide S(2)− and S(3)− anions, and Si–S and B–S bonds were not confirmed. A phase separation by spinodal decomposition was observed after heat-treatment, where sulfur was preferentially distributed to borate-rich phase. Even after the phase separation, formation of non-bridging oxygen was not recognized. The preferential distribution of sulfur anions in the present glass was explainable on the basis of the change in population of sodium ions, which compensated the negatively-charged sulfur anions. en-copyright= kn-copyright= en-aut-name=SaikiKeiji en-aut-sei=Saiki en-aut-mei=Keiji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=SakidaShinichi en-aut-sei=Sakida en-aut-mei=Shinichi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=BeninoYasuhiko en-aut-sei=Benino en-aut-mei=Yasuhiko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=NanbaTokuro en-aut-sei=Nanba en-aut-mei=Tokuro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Graduate School of Environmental Science, Okayama University affil-num=2 en-affil= kn-affil=Environmental Management Center, Okayama University affil-num=3 en-affil= kn-affil=Graduate School of Environmental Science, Okayama University affil-num=4 en-affil= kn-affil=Graduate School of Environmental Science, Okayama University en-keyword=Phase separation kn-keyword=Phase separation en-keyword=Borosilicate glass kn-keyword=Borosilicate glass en-keyword=Chemical state of sulfur kn-keyword=Chemical state of sulfur en-keyword=Glass structure kn-keyword=Glass structure END start-ver=1.4 cd-journal=joma no-vol=31 cd-vols= no-issue= article-no= start-page=26 end-page=31 dt-received= dt-revised= dt-accepted= dt-pub-year=2009 dt-pub=200912 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Material recycling of inorganic sludge by wet ball milling kn-title=湿式ボールミル法を用いた無機性汚泥の再資源化技術の開発 en-subtitle= kn-subtitle= en-abstract= kn-abstract=The possibility of material recycling of inorgamic sludge by wet ball milling with distrilled water and an ethylenediaminetetraacetic acid disodium salt dehydrate (EDTA・2Na・2H(2)O)reagent was investigated. The inorganic sludge consisted of 14.1mass% of the heat-treated sludge obtained after drying and heat treatment, 20.1mass% of active carbon, and 65.9mass% of water. The wet ball milling of the heat-treated sludge was performed using a ball pot and balls in air for 40 h at room temperature with the rotational speed fixed at 200rpm. The fractions of Mn, Fe, Ni, Cu, and Zr in the specimens obtained by wet-ball-milling the heat-treated sludge decreased and those of Si and Al increased. Appropriate content of distilled water and weight of the heat-treated sludge for wet ball milling were 150-250 ml and 4.5 g or less, respectively. When the wet ball milling of the heat-treated sludge was perfomed twice,the fractions of Mn, Fe, Ni, Cu, and Zr in the specimen obtained after repeated wet ball milling remarkably decreased and that of Si increased in comparison with those in the specimens wet-ball-milled once. This suggests that the repeat of wet ball milling of the heat-treated sludge leads to a colorless specimen without colored ions such as Mn, Fe, Ni, and Cu. en-copyright= kn-copyright= en-aut-name=SakidaShinichi en-aut-sei=Sakida en-aut-mei=Shinichi kn-aut-name=崎田真一 kn-aut-sei=崎田 kn-aut-mei=真一 aut-affil-num=1 ORCID= en-aut-name=KurodaRyusuke en-aut-sei=Kuroda en-aut-mei=Ryusuke kn-aut-name=黒田龍介 kn-aut-sei=黒田 kn-aut-mei=龍介 aut-affil-num=2 ORCID= en-aut-name=BeninoYasuhiko en-aut-sei=Benino en-aut-mei=Yasuhiko kn-aut-name=紅野安彦 kn-aut-sei=紅野 kn-aut-mei=安彦 aut-affil-num=3 ORCID= en-aut-name=NanbaTokuro en-aut-sei=Nanba en-aut-mei=Tokuro kn-aut-name=難波徳郎 kn-aut-sei=難波 kn-aut-mei=徳郎 aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=岡山大学環境管理センター affil-num=2 en-affil= kn-affil=岡山大学環境理工学部環境物質工学科 affil-num=3 en-affil= kn-affil=岡山大学環境理工学部環境物質工学科 affil-num=4 en-affil= kn-affil=岡山大学環境理工学部環境物質工学科 en-keyword=Inorganic sludge kn-keyword=Inorganic sludge en-keyword=EDTA kn-keyword=EDTA en-keyword=Wet ball milling kn-keyword=Wet ball milling en-keyword=Recycling kn-keyword=Recycling END