Advanced search
Start date
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

Full text
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]
Total Authors: 7
[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
Total Affiliations: 8
Document type: Journal article
Source: CHEMICAL ENGINEERING JOURNAL; v. 420, n. 2 SEP 15 2021.
Web of Science Citations: 0

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)

FAPESP's process: 18/16244-0 - Analysis of thiamethoxam in bee tissue and pollen by LCMSMS and environmental risk assessment of insecticide thiamethoxam applied to strawberry cultivation on bees Apis mellifera L. and Tetragonisca angustula Latreille (1811)
Grantee:Eny Maria Vieira
Support type: Regular Research Grants