Photodegradation of crystal violet dyestuff on kaolinite-BiFeO3 nanocomposite under different light irradiations

Yıl 2021, Cilt: 11 Sayı: 3, 815 - 827, 15.07.2021

Eda Keleş Güner , Fatih İçer Agah Özdemir , Bülent Çağlar

https://doi.org/10.17714/gumusfenbil.877702

Cited By: 2

Öz

Kaolinite-BiFeO3 (KBFO) nanocomposite was prepared by decorating of perovskite structured BiFeO3 (BFO) nanoparticles on kaolinite surface. Photocatalytic activities of pure kaolin (K), bare BFO and obtained KBFO nanocomposite were evaluated by examining the photocatalytic degradation of cationic crystal violet dyestuff (CV) under UVA and visible light irradiations (GB). KBFO nanocomposite exhibited higher photocatalytic activity than other catalysts and it was determined that photodegradation followed pseudo first order kinetic. In addition, the optimal values were determined by investigating the effects of experimental parameters such as pH, initial dye concentration and catalyst amount values over photocatalysis, The photocatalytic degradation efficiencies of KV on KBFO at pH 9, presence of 10mgL-1 initial dye concentration and 100mg catalyst under UVA and GB light regions were determined as 84% and 89%, respectively. To determine the contribution of the reactive species responsible for the photocatalytic degradation of KV on the KBFO nanocomposite, radical scavenging experiments were performed and a possible mechanism was proposed. According to radical scavenging experiments, hydroxyl radicals have a major role in the photocatalytic degradation of CV.

Anahtar Kelimeler

BiFeO3, Photocatalysis, Kaolinite, Kinetic, Crystal violet, Crystal violet

Farklı ışık kaynakları altında kristal viyole boyar maddesinin kaolin-BiFeO3 nanokompozit üzerinde fotobozunması

Öz

Kaolin yüzeyine perovskit yapılı BiFeO3 (BFO) nanoparçacıklarının yerleştirilmesiyle Kaolin-BiFeO3 (KBFO) nanokompoziti hazırlandı. Saf kaolin (K), saf BFO ve hazırlanan KBFO nanokompozitin fotokatalitik aktiviteleri UVA ve görünür bölge ışımaları altında katyonik bir boyar madde olan kristal viyole (KV)’nin fotokatalitik bozunması incelenerek değerlendirildi. KBFO nanokompozitinin diğer katalizörlere nispeten daha yüksek fotokatalitik aktivite sergilediği ve fotobozunmanın yalancı birinci dereceden kinetik izlediği belirlendi. Ayrıca pH, başlangıç boya konsantrasyonu ve katalizör miktarı gibi deneysel parametrelerin fotokataliz reaksiyonuna etkileri incelenerek en uygun değerleri tespit edildi. pH 9’da 10mgL-1 başlangıç boya konsantrasyonunda ve 100 mg katalizör varlığında KV’nin KBFO katalizörü üzerindeki fotokatalitik bozunma verimleri UVA ve GB ışınları altında sırasıyla % 84 ve % 89 olarak belirlendi. KV'nin KBFO nanokompozit üzerindeki fotokatalitik bozunmasından sorumlu olan reaktif türlerinin katkısını belirlemek için radikal süpürücü deneyler yapıldı ve olası mekanizma önerildi. Yapılan radikal süpürücü deneylerine göre hidroksil radikallerinin KV’nin fotokatalitik bozunmasında başlıca role sahip olduğu tespit edildi.

Anahtar Kelimeler

BiFeO3, Fotokataliz, Kaolin, Kinetik, Kristal Viyole

Kaynakça

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