Pub Date : 2021-12-01DOI: 10.1590/0366-69132021673843082
A. C. Eduardo, M. H. M. Rodrigues, W. D. Mesquita, R. F. Gonçalves, M. F. Gurgel, M. Godinho
Resumo O uso de pesticidas, como o fipronil, visa o aumento da produtividade, melhoria na qualidade dos produtos gerados e a diminuição de prejuízos. Contudo, os resíduos acumulados podem ser lavados durante as chuvas, ocasionando a contaminação de águas superficiais e subterrâneas. Nesse aspecto, a combinação entre semicondutores na forma de heteroestruturas é uma alternativa para degradação de tais poluentes. Heteroestruturas BiVO4/CePO4 e CePO4/BiVO4 foram sintetizadas pelo método de coprecipitação seguido de tratamento hidrotérmico assistido por micro-ondas, a 130 °C por 30 min. Os estudos de difração de raios X demonstraram a formação das heteroestruturas com estruturas de fase hexagonal (CePO4) e tetragonais scheelita e zircônia (BiVO4). Os resultados obtidos por microscopia eletrônica de transmissão e espectroscopia de infravermelho sugeriram a formação de uma região de interface, a qual contribuiu na sinergia entre os catalisadores. As heteroestruturas BiVO4/CePO4 e CePO4/BiVO4 apresentaram degradação de 80,06% e 99,50%, respectivamente, frente ao pesticida fipronil.
{"title":"Estudo da degradação do pesticida fipronil utilizando heteroestruturas de semicondutores de BiVO4/CePO4 e CePO4/BiVO4","authors":"A. C. Eduardo, M. H. M. Rodrigues, W. D. Mesquita, R. F. Gonçalves, M. F. Gurgel, M. Godinho","doi":"10.1590/0366-69132021673843082","DOIUrl":"https://doi.org/10.1590/0366-69132021673843082","url":null,"abstract":"Resumo O uso de pesticidas, como o fipronil, visa o aumento da produtividade, melhoria na qualidade dos produtos gerados e a diminuição de prejuízos. Contudo, os resíduos acumulados podem ser lavados durante as chuvas, ocasionando a contaminação de águas superficiais e subterrâneas. Nesse aspecto, a combinação entre semicondutores na forma de heteroestruturas é uma alternativa para degradação de tais poluentes. Heteroestruturas BiVO4/CePO4 e CePO4/BiVO4 foram sintetizadas pelo método de coprecipitação seguido de tratamento hidrotérmico assistido por micro-ondas, a 130 °C por 30 min. Os estudos de difração de raios X demonstraram a formação das heteroestruturas com estruturas de fase hexagonal (CePO4) e tetragonais scheelita e zircônia (BiVO4). Os resultados obtidos por microscopia eletrônica de transmissão e espectroscopia de infravermelho sugeriram a formação de uma região de interface, a qual contribuiu na sinergia entre os catalisadores. As heteroestruturas BiVO4/CePO4 e CePO4/BiVO4 apresentaram degradação de 80,06% e 99,50%, respectivamente, frente ao pesticida fipronil.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48605822","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}
Pub Date : 2021-12-01DOI: 10.1590/0366-69132021673843138
M. Meziani, M. Amari, M. Baloul, N. Chelouah
{"title":"Study of chemical and thermal activations of zeolite-lime blend","authors":"M. Meziani, M. Amari, M. Baloul, N. Chelouah","doi":"10.1590/0366-69132021673843138","DOIUrl":"https://doi.org/10.1590/0366-69132021673843138","url":null,"abstract":"","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48680578","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}
Pub Date : 2021-12-01DOI: 10.1590/0366-69132021673843129
V. Ramos, D. Vedoy, P. C. C. D. Araújo, J. Marques, P. Quintela, E. Jesus
{"title":"Modeling, equilibrium and kinetics of CO2 adsorption in LTA zeolite obtained from clay","authors":"V. Ramos, D. Vedoy, P. C. C. D. Araújo, J. Marques, P. Quintela, E. Jesus","doi":"10.1590/0366-69132021673843129","DOIUrl":"https://doi.org/10.1590/0366-69132021673843129","url":null,"abstract":"","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47763846","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}
Pub Date : 2021-12-01DOI: 10.1590/0366-69132021673843173
H. Onoda, K. Hayashi
{"title":"Preparation of novel cosmetic white pigment by pyrophosphate treatment of zinc oxide","authors":"H. Onoda, K. Hayashi","doi":"10.1590/0366-69132021673843173","DOIUrl":"https://doi.org/10.1590/0366-69132021673843173","url":null,"abstract":"","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67183904","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}
Pub Date : 2021-12-01DOI: 10.1590/0366-69132021673843084
L. M. Santos, D. Silva, M. R. Santos, A. Machado
Mesoporous TiO 2 nanoparticles were synthesized by the sol-gel method and using hydrothermal treatment at 200 ºC during different time intervals, which allowed the evaluation of the time or the treatment on the structural, morphological, and optical properties of the oxides. TEM micrographs showed that the morphology of the materials was characterized by the presence of spherical clusters, while the crystalline phases of the anatase and brookite mixtures were analyzed by X-ray diffraction and Raman spectroscopy. A type IV profile was identified from the results of specific surface area, which is characteristic of the mesoporous material with strong and weak affinity. The band gap in the range of 3.29 and 3.40 eV, estimated by the Kubelka-Munk function, showed a gradual increase as a result of oxide crystallization. It was found that 8 h of treatment in a hydrothermal system was sufficient to synthesize a photocatalyst with optimal photocatalytic performance. This efficiency was probably based on a good correlation between physical and chemical factors, such as high surface area and porosity, the improved capability of photon adsorption in the visible range, crystallinity, and a favorable content of brookite.
{"title":"Effect of time of hydrothermal heat treatment on mesoporous nano-TiO2 synthesis","authors":"L. M. Santos, D. Silva, M. R. Santos, A. Machado","doi":"10.1590/0366-69132021673843084","DOIUrl":"https://doi.org/10.1590/0366-69132021673843084","url":null,"abstract":"Mesoporous TiO 2 nanoparticles were synthesized by the sol-gel method and using hydrothermal treatment at 200 ºC during different time intervals, which allowed the evaluation of the time or the treatment on the structural, morphological, and optical properties of the oxides. TEM micrographs showed that the morphology of the materials was characterized by the presence of spherical clusters, while the crystalline phases of the anatase and brookite mixtures were analyzed by X-ray diffraction and Raman spectroscopy. A type IV profile was identified from the results of specific surface area, which is characteristic of the mesoporous material with strong and weak affinity. The band gap in the range of 3.29 and 3.40 eV, estimated by the Kubelka-Munk function, showed a gradual increase as a result of oxide crystallization. It was found that 8 h of treatment in a hydrothermal system was sufficient to synthesize a photocatalyst with optimal photocatalytic performance. This efficiency was probably based on a good correlation between physical and chemical factors, such as high surface area and porosity, the improved capability of photon adsorption in the visible range, crystallinity, and a favorable content of brookite.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48531187","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}
Pub Date : 2021-12-01DOI: 10.1590/0366-69132021673843137
P. O. Odewole
The viability of preparing cellular ceramics suitable for external wall insulation of buildings was investigated using granite dust, ball clay, plantain peels, sodium silicate, and sodium hydroxide. The predetermined compositions of the raw materials were mixed homogeneously and then subjected to uniaxial pressing at 10 MPa. The formulated samples were oven-dried and sintered in a gas kiln at 850 °C for 3 h. The obtained cellular ceramics were then subjected to standard property tests. The results revealed water absorption of 19.5-41.7%, bulk density of 1.39-1.86 g/cm3, apparent porosity of 36.4-66.7%, thermal conductivity of 0.09-0.62 W/(m.K), and compressive strength of 0.9-18.4 MPa. From the results, the optimum sample of the cellular ceramics prepared is a potential thermal insulation material for load-bearing applications such as walling systems in buildings, where not only low thermal conductivity but also high mechanical strength is required.
{"title":"Evaluating the properties of cellular ceramics prepared with a granite dust and plantain (Musa paradisiaca) peel powder for external wall thermal insulation of buildings","authors":"P. O. Odewole","doi":"10.1590/0366-69132021673843137","DOIUrl":"https://doi.org/10.1590/0366-69132021673843137","url":null,"abstract":"The viability of preparing cellular ceramics suitable for external wall insulation of buildings was investigated using granite dust, ball clay, plantain peels, sodium silicate, and sodium hydroxide. The predetermined compositions of the raw materials were mixed homogeneously and then subjected to uniaxial pressing at 10 MPa. The formulated samples were oven-dried and sintered in a gas kiln at 850 °C for 3 h. The obtained cellular ceramics were then subjected to standard property tests. The results revealed water absorption of 19.5-41.7%, bulk density of 1.39-1.86 g/cm3, apparent porosity of 36.4-66.7%, thermal conductivity of 0.09-0.62 W/(m.K), and compressive strength of 0.9-18.4 MPa. From the results, the optimum sample of the cellular ceramics prepared is a potential thermal insulation material for load-bearing applications such as walling systems in buildings, where not only low thermal conductivity but also high mechanical strength is required.","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48993122","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}
Pub Date : 2021-12-01DOI: 10.1590/0366-69132021673843090
H. N. Costa, C. C. Noberto, L. A. Almeida, R. Nogueira, A. Cabral
{"title":"Alkaline activation of cement pastes with desulfurization slag","authors":"H. N. Costa, C. C. Noberto, L. A. Almeida, R. Nogueira, A. Cabral","doi":"10.1590/0366-69132021673843090","DOIUrl":"https://doi.org/10.1590/0366-69132021673843090","url":null,"abstract":"","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48263370","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}
Pub Date : 2021-12-01DOI: 10.1590/0366-69132021673843146
A. Souza, J. R. Fernandes, J. F. S. Ribeiro, M. J. Souza, A. M. Garrido Pedrosa
{"title":"Development of LaMnO3 and LaNiO3 type materials with calcium doping by the modified proteic method and evaluation for the dye removal efficiency","authors":"A. Souza, J. R. Fernandes, J. F. S. Ribeiro, M. J. Souza, A. M. Garrido Pedrosa","doi":"10.1590/0366-69132021673843146","DOIUrl":"https://doi.org/10.1590/0366-69132021673843146","url":null,"abstract":"","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67184164","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}
Pub Date : 2021-12-01DOI: 10.1590/0366-69132021673843164
Y. Bakhaled, L. Hamzioui, F. Kahoul, A. H. Hamzaoui, A. Midouni, M. Aillerie
{"title":"Structural and dielectric properties of (1-x)Pb(Zr0.53Ti0.47)O3-xGdMnO3 ceramics","authors":"Y. Bakhaled, L. Hamzioui, F. Kahoul, A. H. Hamzaoui, A. Midouni, M. Aillerie","doi":"10.1590/0366-69132021673843164","DOIUrl":"https://doi.org/10.1590/0366-69132021673843164","url":null,"abstract":"","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47743563","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}
Pub Date : 2021-12-01DOI: 10.1590/0366-69132021673843072
J. D. Mota, R. S. S. Cunha, M. Rodrigues
{"title":"Removal of Pb2+ and Zn2+ using modified Chocolate B clay: a study using statistical analysis, equilibrium isotherms, and adsorption kinetics","authors":"J. D. Mota, R. S. S. Cunha, M. Rodrigues","doi":"10.1590/0366-69132021673843072","DOIUrl":"https://doi.org/10.1590/0366-69132021673843072","url":null,"abstract":"","PeriodicalId":9824,"journal":{"name":"Cerâmica","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67183810","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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