Adsorption of atrazine from aqueous systems on chemically activated biochar produced from corn straw

Autor(es)

do Nascimento, Cleuciane Tillvitz ^[1] ; Vieira, Melissa Gurgel Adeodato ^[2] ; Scheufele, Fabiano Bisinella ^[3] ; Palu, Fernando ^[1] ; da Silva, Edson Antonio ^[1] ; Borba, Carlos Eduardo ^[1]

Afiliação do(s) autor(es)

^[1] Western Parana State Univ, UNIOESTE, Campus Toledo, Rua Faculdade 645, BR-85903000 Toledo, PR - Brazil

^[2] Univ Estadual Campinas, UNICAMP, Sch Chem Engn, Cidade Univ Zeferino Vaz, POB 6066, BR-13081970 Campinas, SP - Brazil

^[3] Technol Fed Univ Parana UTFPR, Grad Program Chem & Biotechnol Proc, Campus Toledo, Rua Cristo Rei 19, BR-85902490 Toledo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING; v. 10, n. 1 FEB 2022.
• Citações Web of Science: 0

Resumo

In this research, the atrazine adsorption onto activated biochar produced from corn straw was evaluated based on kinetic and equilibrium studies and physical, chemical and morphological analyses. Batch adsorption experiments were performed to obtain kinetic and equilibrium parameters which were used to simulate the process' performance on fixed-bed column. The activated biochar showed specific surface area, total pore volume and average pore radius of 573 m(2) g(-1), 0.3054 cm(3) g(-1) and 10.7 angstrom, respectively, while the non-activated biochar exhibited lower specific surface area (504 m(2) g(-1)) in comparison with the activated biochar. The atrazine adsorption mechanism was predominantly driven by hydrogen bonds and pi-pi stacking. The experimental equilibrium data was adequately described by Langmuir isotherm, showing high adsorbate-adsorbent affinity (K-L = 4.287 L mg(-1)). The adsorbent also showed favorable kinetics which was well described by the intraparticle diffusion model. The atrazine adsorption dynamics on fixed-bed column packed with the produced biochar was investigated by using an experimental design associated to phenomenological mathematical modeling. The approach was able to predict the column behavior from the batch parameters and was experimentally validated, showing an efficiency of 72% and breakthrough time of 520 min. The results evidenced the effectiveness of the produced biochar to remove atrazine from water as well as the model to adequately predict the batch and column's performance. (AU)

• Processo FAPESP: 20/16004-9 - Desenvolvimento de bioadsorventes avançados e modelos baseados em inteligência artificial para aplicação na remoção e monitoramento de poluentes emergentes em meios aquosos
• Beneficiário: Meuris Gurgel Carlos da Silva
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 19/11353-8 - Centro Brasileiro de Pesquisa em Água (BWRC)
• Beneficiário: Lauro Tatsuo Kubota
• Modalidade de apoio: Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia