ASSESSMENT OF ORGANOCLAY STRUCTURAL PROPERTIES AFTER GASOLINE ADSORPTION PROCESS

ASSESSMENT OF ORGANOCLAY STRUCTURAL PROPERTIES AFTER GASOLINE ADSORPTION PROCESS

SPERIDIÃO, D. D. C. A.; SANTOS, O. A. ANDREO DOS; VIEIRA, M. G. A.

Artigo:

The removal of organic contaminants from water and wastewater is a key problem of environmental remediation which can be solved by adsorption process, especially with the use of organoclays for their abundance, variety and low cost. Therefore, this study aimed the evaluation of modifications on the structure of a commercial bentonite organoclay named Spectrogel due to the adsorption process with gasoline and isooctane. The characterization of the organoclay was accomplished through TGA, DSC, FT-IR, SEM/EDX, XRD and Helium picnometry analyzes before and after the process of gasoline removal. Modifications in the organoclay structure were verified and could be attributed to the adsorption process of the organic compounds. 1. INTRODUCTION According to the Environmental Company of State of São Paulo (CETESB) 80% of municipality of São Paulo are totally or partially dependant on underground water. Annual reports from CETESB (2012) shows that nearly 77% of identified contaminated areas of the state are due gas station activities. This follows up what the Environmental Protection Agency from USA (USEPA) surveyed on late 80’s. These contaminations are from expired underground fuel storage tanks and without proper maintenance according to Tiburtius et al. (2005). According to Wang et al. (2013) fuels like gasoline and diesel have highly toxic, carcinogenic and mutagenic additives like BTX, and if it was not bad enough the presence of alcohol worsen the risk of contamination by enhancing the mobility of all petroleum hydrocarbons on soil as studied by Adam et al. (2002). These fuels also damage the environment by changing soil permeability to water and harm the flora according to Zhang et al (2006). Among the treatments of oily water a very promising one is the adsorption process using organoclays due their high capability to remove hydrophobic contaminants from aqueous solutions. As clays are a very abundant in nature and cheap this represents an economic advantage in the process

The removal of organic contaminants from water and wastewater is a key problem of environmental remediation which can be solved by adsorption process, especially with the use of organoclays for their abundance, variety and low cost. Therefore, this study aimed the evaluation of modifications on the structure of a commercial bentonite organoclay named Spectrogel due to the adsorption process with gasoline and isooctane. The characterization of the organoclay was accomplished through TGA, DSC, FT-IR, SEM/EDX, XRD and Helium picnometry analyzes before and after the process of gasoline removal. Modifications in the organoclay structure were verified and could be attributed to the adsorption process of the organic compounds. 1. INTRODUCTION According to the Environmental Company of State of São Paulo (CETESB) 80% of municipality of São Paulo are totally or partially dependant on underground water. Annual reports from CETESB (2012) shows that nearly 77% of identified contaminated areas of the state are due gas station activities. This follows up what the Environmental Protection Agency from USA (USEPA) surveyed on late 80’s. These contaminations are from expired underground fuel storage tanks and without proper maintenance according to Tiburtius et al. (2005). According to Wang et al. (2013) fuels like gasoline and diesel have highly toxic, carcinogenic and mutagenic additives like BTX, and if it was not bad enough the presence of alcohol worsen the risk of contamination by enhancing the mobility of all petroleum hydrocarbons on soil as studied by Adam et al. (2002). These fuels also damage the environment by changing soil permeability to water and harm the flora according to Zhang et al (2006). Among the treatments of oily water a very promising one is the adsorption process using organoclays due their high capability to remove hydrophobic contaminants from aqueous solutions. As clays are a very abundant in nature and cheap this represents an economic advantage in the process

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DOI: 10.5151/chemeng-cobeq2014-1480-19079-174833

Referências bibliográficas

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Como citar:

SPERIDIÃO, D. D. C. A.; SANTOS, O. A. ANDREO DOS; VIEIRA, M. G. A.; "ASSESSMENT OF ORGANOCLAY STRUCTURAL PROPERTIES AFTER GASOLINE ADSORPTION PROCESS", p-8774-8780. In: Anais do XX Congresso Brasileiro de Engenharia Química - COBEQ 2014 [= Blucher Chemical Engineering Proceedings, v.1, n.2]. São Paulo: Blucher, 2015.
ISSN 23591757, DOI 10.5151/chemeng-cobeq2014-1480-19079-174833