iodegradable Composites Made by Cassava Peels, Residual Glycerin, Bentonite, and Zeolite: The Contribution to the Treatment of BTEX in Gasoline-Contaminated Soil

Autor(es)

Silva, Lilian Cristina S. ^[1] ; Camani, Paulo H. ^[1] ; de Lima, Elizabete C. ^[2] ; Rosa, Derval S. ^[1]

Afiliação do(s) autor(es)

^[1] Fed Univ ABC UFABC, Ctr Engn Modeling & Appl Social Sci CECS, Santo Andre, SP - Brazil

^[2] Fed Univ ABC UFABC, Ctr Nat & Human Sci CCNH, Santo Andre, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: WASTE AND BIOMASS VALORIZATION; v. 13, n. 4, SI JAN 2022.
• Citações Web of Science: 0

Resumo

Biodegradable composite materials were developed to act as substrates to treat gasoline-contaminated soil. The starch matrix (SM) and biodegradable composites (C) were prepared by extrusion, using thermoplastic starch (SM) {[}obtained from cassava peels and residual (blond) glycerin], and with the addition of 5 and 10 wt% of the zeolite (Z) or bentonite (B). The morphology of SM and biodegradable composites were characterized by Scanning Electron Microscopy (SEM) and the wettability by contact angle measurements. Soil systems containing gasoline-contaminated soil were verified by tests of growth of microorganisms, pH, carbon contents, benzene, toluene, ethylbenzene, and xylene (BTEX) measurement into the soil, by high-performance liquid chromatography (HPLC). The presence of these minerals (Z or B) into the polymeric matrix of the biodegradable composite samples (C-Z and C-B) promoted an increase of surface roughness, which decreased contact angle values, and favored the microorganisms' growth. The maximum values of BTEX retention occurred for the C-Z10 soil system, which was 43.4% for benzene, 42.2% for toluene, 36.1% for ethylbenzene, and 37.4% for xylene. Therefore, bentonite and zeolite inside the biodegradable polymer promoted the highest water retention and BTEX adsorption in the first days of the treatment process, an option for gasoline-contaminated soil bioremediation. {[}GRAPHICS] . (AU)

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