Coupling Zero-Valent Iron and Fenton processes for degrading sulfamethazine, sulfathiazole, and norfloxacin

Autor(es)

Fornazari, Ana Luiza ^[1] ; Labriola, Vanessa Feltrin ^[1] ; da Silva, Bianca Ferreira ^[2] ; Castro, Lucas Fernandes ^[3] ; Perussi, Janice Rodrigues ^[3] ; Vieira, Eny Maria ^[4] ; Azevedo, Eduardo Bessa ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Sao Carlos Inst Chem, Lab Desenvolvimento Tecnol Ambientais LDTAmb, Ave Trabalhador Sao Carlense 400, Sao Carlos, SP - Brazil

^[2] Sao Paulo State Univ UNESP, Araraquara Chem Inst, Dept Quim Analit, Rua Prof Francisco Degni 55, Araraquara, SP - Brazil

^[3] Univ Sao Paulo, Sao Carlos Inst Chem, Grp Fotosensibilizadores, Ave Trabalhador Sao Carlense 400, Sao Carlos, SP - Brazil

^[4] Univ Sao Paulo, Sao Carlos Inst Chem, Grp Quim Analit Ambiental & Ecotoxicol, Ave Trabalhador Sao Carlense 400, Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING; v. 9, n. 4 AUG 2021.
• Citações Web of Science: 0

Resumo

In this study, the degradation of three antibiotics - sulfamethazine (SMT), sulfathiazole (STZ), and norfloxacin (NOR) (1.0 mg L-1 each) - was achieved by coupling the Zero-Valent Iron Process using supported metallic iron nanoparticles (nZVI) to the Fenton one. The system was operated in single-pass continuous-flow mode at steadystate regime (after 15 min). The nanoparticles were packed into a fixed-bed reactor and characterized by several techniques (SEM, EDX, TEM, and XRD). The degradation experiments were performed according to a 2(2) factorial design, in which the effects of pH and flow rate (Q) were studied. The degradation conditions were: initial pH = 3.0 and Q = 20 mL min(-1). H2O2 was then continuously added to the effluent of the nZVI reactor (containing Fe2+) in order to perform the Fenton process in the following mixing vessel (H2O2 concentration of 34 mg L-1). At the exit of the system, the antibiotics concentrations were below the detection limit of the chromatographic method (40 mu g L-1) and dissolved iron was below 1.0 mg L-1. Sixteen degradation products (DPs) of SMT, STZ, and NOR were detected and identified using HPLC-MS/MS. Their ecotoxicological endpoints (LC50, EC50, and ChV) for three trophic levels were estimated with the aid of the ECOSAR 2.0 software. No ecotoxicity was generated towards Lactuca sativa during treatment. The proposed system was able to partially remove the antimicrobial activity (Escherichia coli) of both sulfonamides (16%) and NOR (47%). (AU)

• Processo FAPESP: 08/10449-7 - Avaliação da ocorrência, toxicidade/genotoxicidade e processos para degradação de corantes em efluentes e águas superficiais
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Temático