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Melissa Gurgel Adeodato Vieira - One of the best experts on this subject based on the ideXlab platform.
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adsorption of silver from aqueous solution onto pre treated bentonite clay complete batch System Evaluation
Journal of Cleaner Production, 2016Co-Authors: Manuella Lech Cantuaria, Ambrosio Florencio De Almeida Neto, E S Nascimento, Melissa Gurgel Adeodato VieiraAbstract:Abstract In this work, thermally modified bentonite clay (Verde-lodo) was used for batch adsorption of silver from aqueous solution. The adsorption rate was evaluated by a kinetics study based on the following models: pseudo-first order, pseudo-second order, intra-particle diffusion, Mass Transfer in External Film and Boyd model. Among these models, the Mass Transfer in External Film model presented better agreements between experimental and calculated data, revealing that the process is mainly controlled by external transport. The equilibrium isotherms were obtained at four different temperatures (283, 293, 313 and 333 K) and were adjusted by three equilibrium models: Langmuir, Freundlich and Dubinin–Radushkevich. According to the correlation coefficient and Relative Standard Deviation, Langmuir model has presented the best adjustment results. The maximum adsorption capacities verified for Verde-lodo clay at 283 K and 293 K were 61.48 mg g−1 and 55.55 mg g−1, respectively. Furthermore, the increasing trend of adsorption capacity for higher equilibrium temperatures indicates an exothermic behaviour for this process. This fact was also verified by the Evaluation of thermodynamic parameters, which has concluded that the process is spontaneous and governed by physical adsorption. In order to bring scientific advances related to silver recovery from wastewater, batch desorption essays were performed using different eluents. Among the components, nitric acid presented a high desorption capacity and was selected for future experiments. The characterization techniques of regenerated clay revealed that the desorption process do not significantly affect the thermal stability and chemical and crystalline structure of Verde-lodo clay. However, some deformities were verified on the adsorbent's surface by the Scanning Electron Microscopy.
Manuella Lech Cantuaria - One of the best experts on this subject based on the ideXlab platform.
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adsorption of silver from aqueous solution onto pre treated bentonite clay complete batch System Evaluation
Journal of Cleaner Production, 2016Co-Authors: Manuella Lech Cantuaria, Ambrosio Florencio De Almeida Neto, E S Nascimento, Melissa Gurgel Adeodato VieiraAbstract:Abstract In this work, thermally modified bentonite clay (Verde-lodo) was used for batch adsorption of silver from aqueous solution. The adsorption rate was evaluated by a kinetics study based on the following models: pseudo-first order, pseudo-second order, intra-particle diffusion, Mass Transfer in External Film and Boyd model. Among these models, the Mass Transfer in External Film model presented better agreements between experimental and calculated data, revealing that the process is mainly controlled by external transport. The equilibrium isotherms were obtained at four different temperatures (283, 293, 313 and 333 K) and were adjusted by three equilibrium models: Langmuir, Freundlich and Dubinin–Radushkevich. According to the correlation coefficient and Relative Standard Deviation, Langmuir model has presented the best adjustment results. The maximum adsorption capacities verified for Verde-lodo clay at 283 K and 293 K were 61.48 mg g−1 and 55.55 mg g−1, respectively. Furthermore, the increasing trend of adsorption capacity for higher equilibrium temperatures indicates an exothermic behaviour for this process. This fact was also verified by the Evaluation of thermodynamic parameters, which has concluded that the process is spontaneous and governed by physical adsorption. In order to bring scientific advances related to silver recovery from wastewater, batch desorption essays were performed using different eluents. Among the components, nitric acid presented a high desorption capacity and was selected for future experiments. The characterization techniques of regenerated clay revealed that the desorption process do not significantly affect the thermal stability and chemical and crystalline structure of Verde-lodo clay. However, some deformities were verified on the adsorbent's surface by the Scanning Electron Microscopy.
Ambrosio Florencio De Almeida Neto - One of the best experts on this subject based on the ideXlab platform.
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Adsorption of silver from aqueous solution onto pre-treated bentonite clay: complete batch System Evaluation
'Elsevier BV', 2020Co-Authors: Cantuaria, Manuella L., Ambrosio Florencio De Almeida Neto, Nascimento, Eric S., Vieira, Melissa G. A.Abstract:In this work, thermally modified bentonite clay (Verde-lodo) was used for batch adsorption of silver from aqueous solution. The adsorption rate was evaluated by a kinetics study based on the following models: pseudo-first order, pseudo-second order, intra-particle diffusion, Mass Transfer in External Film and Boyd model. Among these models, the Mass Transfer in External Film model presented better agreements between experimental and calculated data, revealing that the process is mainly controlled by external transport. The equilibrium isotherms were obtained at four different temperatures (283, 293, 313 and 333 K) and were adjusted by three equilibrium models: Langmuir, Freundlich and Dubinin–Radushkevich. According to the correlation coefficient and Relative Standard Deviation, Langmuir model has presented the best adjustment results. The maximum adsorption capacities verified for Verde-lodo clay at 283 K and 293 K were 61.48 mg g−1 and 55.55 mg g−1, respectively. Furthermore, the increasing trend of adsorption capacity for higher equilibrium temperatures indicates an exothermic behaviour for this process. This fact was also verified by the Evaluation of thermodynamic parameters, which has concluded that the process is spontaneous and governed by physical adsorption. In order to bring scientific advances related to silver recovery from wastewater, batch desorption essays were performed using different eluents. Among the components, nitric acid presented a high desorption capacity and was selected for future experiments. The characterization techniques of regenerated clay revealed that the desorption process do not significantly affect the thermal stability and chemical and crystalline structure of Verde-lodo clay. However, some deformities were verified on the adsorbent's surface by the Scanning Electron Microscopy112111121121CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP300986/2013-0; 470615/2013-32013/00732-
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adsorption of silver from aqueous solution onto pre treated bentonite clay complete batch System Evaluation
Journal of Cleaner Production, 2016Co-Authors: Manuella Lech Cantuaria, Ambrosio Florencio De Almeida Neto, E S Nascimento, Melissa Gurgel Adeodato VieiraAbstract:Abstract In this work, thermally modified bentonite clay (Verde-lodo) was used for batch adsorption of silver from aqueous solution. The adsorption rate was evaluated by a kinetics study based on the following models: pseudo-first order, pseudo-second order, intra-particle diffusion, Mass Transfer in External Film and Boyd model. Among these models, the Mass Transfer in External Film model presented better agreements between experimental and calculated data, revealing that the process is mainly controlled by external transport. The equilibrium isotherms were obtained at four different temperatures (283, 293, 313 and 333 K) and were adjusted by three equilibrium models: Langmuir, Freundlich and Dubinin–Radushkevich. According to the correlation coefficient and Relative Standard Deviation, Langmuir model has presented the best adjustment results. The maximum adsorption capacities verified for Verde-lodo clay at 283 K and 293 K were 61.48 mg g−1 and 55.55 mg g−1, respectively. Furthermore, the increasing trend of adsorption capacity for higher equilibrium temperatures indicates an exothermic behaviour for this process. This fact was also verified by the Evaluation of thermodynamic parameters, which has concluded that the process is spontaneous and governed by physical adsorption. In order to bring scientific advances related to silver recovery from wastewater, batch desorption essays were performed using different eluents. Among the components, nitric acid presented a high desorption capacity and was selected for future experiments. The characterization techniques of regenerated clay revealed that the desorption process do not significantly affect the thermal stability and chemical and crystalline structure of Verde-lodo clay. However, some deformities were verified on the adsorbent's surface by the Scanning Electron Microscopy.
E S Nascimento - One of the best experts on this subject based on the ideXlab platform.
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adsorption of silver from aqueous solution onto pre treated bentonite clay complete batch System Evaluation
Journal of Cleaner Production, 2016Co-Authors: Manuella Lech Cantuaria, Ambrosio Florencio De Almeida Neto, E S Nascimento, Melissa Gurgel Adeodato VieiraAbstract:Abstract In this work, thermally modified bentonite clay (Verde-lodo) was used for batch adsorption of silver from aqueous solution. The adsorption rate was evaluated by a kinetics study based on the following models: pseudo-first order, pseudo-second order, intra-particle diffusion, Mass Transfer in External Film and Boyd model. Among these models, the Mass Transfer in External Film model presented better agreements between experimental and calculated data, revealing that the process is mainly controlled by external transport. The equilibrium isotherms were obtained at four different temperatures (283, 293, 313 and 333 K) and were adjusted by three equilibrium models: Langmuir, Freundlich and Dubinin–Radushkevich. According to the correlation coefficient and Relative Standard Deviation, Langmuir model has presented the best adjustment results. The maximum adsorption capacities verified for Verde-lodo clay at 283 K and 293 K were 61.48 mg g−1 and 55.55 mg g−1, respectively. Furthermore, the increasing trend of adsorption capacity for higher equilibrium temperatures indicates an exothermic behaviour for this process. This fact was also verified by the Evaluation of thermodynamic parameters, which has concluded that the process is spontaneous and governed by physical adsorption. In order to bring scientific advances related to silver recovery from wastewater, batch desorption essays were performed using different eluents. Among the components, nitric acid presented a high desorption capacity and was selected for future experiments. The characterization techniques of regenerated clay revealed that the desorption process do not significantly affect the thermal stability and chemical and crystalline structure of Verde-lodo clay. However, some deformities were verified on the adsorbent's surface by the Scanning Electron Microscopy.
Helen Meng - One of the best experts on this subject based on the ideXlab platform.
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Predicting User Satisfaction in Spoken Dialog System Evaluation With Collaborative Filtering
IEEE Journal of Selected Topics in Signal Processing, 2012Co-Authors: Zhaojun Yang, Gina-anne Levow, Helen MengAbstract:We propose a collaborative filtering (CF) model to predict user satisfaction in SDS Evaluation. Inspired by the use of CF in recommendation Systems, where a user's preference for a new item is assume to resemble that for similar items rated previously, we adapt the idea to predict user Evaluations of unrated dialogs based on the ratings received by similar dialogs. Ratings of dialogs are gathered by crowdsourcing through Amazon Mechanical Turk. A reference baseline is provided by a linear regression model (LRM) based on the PARADISE framework. We present two versions of the CF model. First, the item-based collaborative filtering model (ICFM) clusters rated dialogs and builds an LRM for each cluster. The rating of an unseen dialog is predicted by the LRM of its most similar cluster. Second, the extended ICFM (EICFM) separates dialog features into user-related and System-related groups, to build LRMs for these separately. Experimental results on dialogs from the Let's Go! System show both ICFM and EICFM can significantly improve the proportion of variability explained by the LRM. We also demonstrate the generalizability of the CF model to a new dialog corpus from the Systems in the Spoken Dialog Challenge (SDC) 2010.
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Collaborative filtering model for user satisfaction prediction in Spoken Dialog System Evaluation
2010 IEEE Spoken Language Technology Workshop, 2010Co-Authors: Zhaojun Yang, Gina-anne Levow, Baichuan Li, Yi Zhu, Irwin King, Helen MengAbstract:Developing accurate models to automatically predict user satisfaction about the overall quality of a Spoken Dialog System (SDS) is highly desirable for SDS Evaluation. In the original PARADISE framework, a linear regression model is trained using measures drawn from rated dialogs as predictors with user satisfaction as the target. In this paper, we extend PARADISE by introducing a collaborative filtering (CF) model for user satisfaction prediction and its corresponding extension. This prediction model is drawn from the idea of CF in recommendation Systems, which uses information from near neighbors of an unrated dialog to predict its user satisfaction. We also present the methodology of collecting user judgments on SDS quality with crowdsourcing through Amazon Mechanical Turk. Experimental results show that the CF approaches could distinctly improve the prediction accuracy of user satisfaction.
