Tuning ZnO/GO p-n heterostructure with carbon interlayer supported on clay for visible-light catalysis: Removal of steroid estrogens from water

Autor(es)

Bayode, Ajibola A. ^{[1, 2, 3]} ; Vieira, Eny Maria ^[3] ; Moodley, Roshila ^[4] ; Akpotu, Samson ^[5] ; de Camargo, Andrea S. S. ^[6] ; Fatta-Kassinos, Despo ^{[7, 8]} ; Unuabonah, Emmanuel I. ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] Redeemers Univ, Dept Chem Sci, Fac Nat Sci, PMB 230, Ede, Osun State - Nigeria

^[2] Redeemers Univ, African Ctr Excellence Water & Environm Res ACEWA, PMB 230, Ede 232101, Osun State - Nigeria

^[3] Univ Sao Paulo, Inst Quim, Dept Quim & Fis Mol, Lab Quim Analit Ambiental & Ecotoxicol LaQuAAE, Sao Carlos - Brazil

^[4] Univ KwaZulu Natal, Sch Chem & Phys, Westville Campus, ZA-4000 Durban - South Africa

^[5] Vaal Univ Technol, Dept Chem, Vanderbijlpk 1900, Gauteng - South Africa

^[6] Univ Sao Paulo, Sao Carlos Inst Phys, Ave Trabalhador Saocarlense 400, BR-13566590 Sao Carlos - Brazil

^[7] Univ Cyprus, Sch Engn, Dept Civil & Environm Engn, POB 20537, CY-1678 Nicosia - Cyprus

^[8] Univ Cyprus, Sch Engn, Nireas Int Water Res Ctr, POB 20537, CY-1678 Nicosia - Cyprus

• Tipo de documento: Artigo Científico
• Fonte: CHEMICAL ENGINEERING JOURNAL; v. 420, n. 2 SEP 15 2021.
• Citações Web of Science: 0

Resumo

This study demonstrates the efficiency of a new visible-light p-n ZnO/GO heterostructured composite catalyst supported on clay with carbon interlayer. This photocatalyst was prepared via microwave assisted technique for the removal of four steroid estrogens in water: Estrone (E1), 17-beta-estradiol (E2), Estriol (E3) and the synthetic estrogen 17-alpha ethinylestradiol (EE2). The prepared catalyst was characterized by different techniques: FE-SEM, EDX, RAMAN, ATR-FTIR, XPS, BET, UV-VIS, and PL. Studies confirmed that the presence of carbon interlayer (from carica papaya seeds) and graphene oxide (GO) were important for the visible-light efficiency of the photocatalyst. In single solute systems, estrogen removal was >89% and as high as 98% and this was not significantly different in a competitive system. In real wastewater samples, efficiency was 63-78% estrogen removal. A reuse study suggested that the photocatalyst efficiency was slightly >80% after 3 reuse cycles. The presence of humic acid reduced the efficiency to >= 70% for all estrogens while the addition of 1% H2O2 raised photodegradation of estrogens to 100% in 10 min. However, using the chemical oxidation demand test, the actual oxidation level of steroid estrogens after photodegradation was 51-77% for the various steroid estrogens. Important reactive oxygen species responsible for photodegradation was hydroxyl radical (HO center dot) via superoxide radical (center dot O2-) and hole (h+) formation from the photocatalytic composite. Test with ceriodaphnia silvestrii suggests very mild toxicity from treated water which is below the acute level of these estrogens (LC50 = ca. 0.89 mg/L). (AU)

• Processo FAPESP: 18/16244-0 - Análise do tiametoxam em tecido de abelha e de pólen por LCMSMS e avaliação do risco ambiental do inseticida tiametoxam aplicado ao cultivo do morango sobre as abelhas Apis mellifera L. e Tetragonisca angustula Latreille (1811)
• Beneficiário: Eny Maria Vieira
• Modalidade de apoio: Auxílio à Pesquisa - Regular