Description of organic compound vapor-phase sorption by geosorbents: Adequacy of the isotherm approximation

Breus, I. P.; Mishchenko, A. A.; Potashev, K. A.; Breus, Vladimir

doi:10.1016/j.colsurfa.2005.10.029

Cited by 10 publications

(4 citation statements)

References 22 publications

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“…For soils, the MBET (denoted as PD in Breus et al . []) showed good fits to organic vapor sorption isotherms of several soils. The theoretical basis and the good performance of the MBET model for desorption data suggest that it should be considered together with the GAB model for future evaluation of soil sorption isotherms.…”

Section: Resultsmentioning

confidence: 91%

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Evaluation of theoretical and empirical water vapor sorption isotherm models for soils

Arthur

Tuller

Møldrup

et al. 2016

Water Resources Research

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The mathematical characterization of water vapor sorption isotherms of soils is crucial for modeling processes such as volatilization of pesticides and diffusive and convective water vapor transport. Although numerous physically based and empirical models were previously proposed to describe sorption isotherms of building materials, food, and other industrial products, knowledge about the applicability of these functions for soils is noticeably lacking. We present an evaluation of nine models for characterizing adsorption/desorption isotherms for a water activity range from 0.03 to 0.93 based on measured data of 207 soils with widely varying textures, organic carbon contents, and clay mineralogy. In addition, the potential applicability of the models for prediction of sorption isotherms from known clay content was investigated. While in general, all investigated models described measured adsorption and desorption isotherms reasonably well, distinct differences were observed between physical and empirical models and due to the different degrees of freedom of the model equations. There were also considerable differences in model performance for adsorption and desorption data. While regression analysis relating model parameters and clay content and subsequent model application for prediction of measured isotherms showed promise for the majority of investigated soils, for soils with distinct kaolinitic and smectitic clay mineralogy predicted isotherms did not closely match the measurements.

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Section: Resultsmentioning

confidence: 91%

“…Theoretically, the MBET k 1 and k 2 parameters correspond to the energy constant and monolayer capacity of the BET and GAB models and can be approximated with

M_{0} = 1 / (k_{1} + k_{2})

and

C = (k_{2} / k_{1}) + 1

[ Breus et al ., ]. The introduced n parameter quantifies the number of adsorbed molecular layers.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of theoretical and empirical water vapor sorption isotherm models for soils

Arthur

Tuller

Møldrup

et al. 2016

Water Resources Research

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“…Investigations of vapor recovery from hydrocarbon solvents or air purification from hydrocarbons have been carried out for many years (Fugassi et al 1958;Shimizu et al 1998;Breus et al 2006;Belov et al 2009;Shi et al 2011). However there are not many publications explaining the principles behind the phenomenon of aliphatic molecules locating themselves on the surface of porous materials, especially geosorbents like hard coals.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis of sorption of small molecule hydrocarbons and polar substances in polish hard coals

Jodłowski

Wójcik

2013

Adsorption

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The subject of the article is the thermodynamic analysis of the sorption of aliphatic hydrocarbons in hard coals from polish mines. The analysis is based on a Multisorption model designed for describing small molecule sorption in different types of carbonaceous materials (e.g. hard coals, lignites or active carbons). Experimental isotherms of hydrocarbons: hexane, heptane, octane and benzene, in hard coals of different rank, together with water and methanol vapor isotherms measured at room temperature (25°C), are taken as comparative data for simulations. Results of the analyses reveal the complicated behavior of linear molecules in the sorption system. The location of molecules on the sorbent surface brings a spectrum of problems associated with the incomplete filling of pores, the coiling up of chains, the formulation of plates or globules, and the blocking of micropores. All these effects have an influence on the level and character of sorption, often in opposing ways. The sorption of small inorganic molecules is taken into account in the objective of achieving a more precise identification of the structure of coal. Semi-simultaneous computations for all types of sorbates have already been carried out.

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“…Esse procedimento foi realizado para duas amostras de solo, ou seja, em duplicata. (Breus et al, 2006;Filimonova et al, 2006).…”

Section: Materiais E Métodosunclassified

Tratamento de solos contaminados com bifenilas policloradas (PCBs).

Policarpo¹

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Devido à alta toxicidade, a produção e comercialização dos PCBs (Polychlorinated Biphenyls-Bifenilas Policloradas) estão proibidas no mundo todo. Esses compostos foram utilizados principalmente como base de misturas comerciais em óleos dielétricos para transformadores e capacitores. Hoje existem diversas áreas contaminadas com essas substâncias que são de difícil degradação ocasionada pela sua elevada estabilidade térmica e química. Há diversos estudos sobre diferentes técnicas de tratamento de áreas contaminadas por PCBs. A técnica proposta nesse trabalho foi a de oxidação química através do reagente de Fenton. Para isso, foi simulado em laboratório experimentos de tratamento de solo contaminados artificialmente por ascarel (mistura comercial de PCBs). A oxidação foi realizada segundo a técnica do planejamento experimental fatorial de dois níveis e duas variáveis. Manteve-se constante a concentração do contaminante-em torno de 6000 mg de PCB/ kg de solo-e variou-se a concentração de Fe 2+ (0,04 a 0,1 mol/L) e H 2 O 2 (2,07 a 4,15 mol/L). Os ensaios foram realizados ainda nos seguintes tempos de reação: 0, 5, 24 e 48 horas. A análise dos dados foi realizada através de cromatografia gasosa acoplada a um espectrômetro de massa-GC/MS. Dos resultados, concluiu-se que o experimento cuja concentração do reagente de Fenton era 4,15 mol/L de H 2 O 2 e 0,04 mol/L de Fe 2+ , apresentou melhor percentual de remoção, em torno de 76% para o pentaclorobifenila, 67% para o hexaclorobifenila e 72% para o heptaclorobifenila. Além disso, observou-se que, dentro da região experimental estudada, o efeito da concentração de íons ferrosos foi mais significativo do que o causado pela concentração de peróxido de hidrogênio e que o mesmo tem um efeito negativo pois aumentando a concentração dos íons ferrosos diminui-se a remoção dos contaminantes. Palavras-chave: Solos. Bifenilas Policloradas. Reagente de Fenton.

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Description of organic compound vapor-phase sorption by geosorbents: Adequacy of the isotherm approximation

Cited by 10 publications

References 22 publications

Evaluation of theoretical and empirical water vapor sorption isotherm models for soils

Evaluation of theoretical and empirical water vapor sorption isotherm models for soils

Comparative analysis of sorption of small molecule hydrocarbons and polar substances in polish hard coals

Tratamento de solos contaminados com bifenilas policloradas (PCBs).

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