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Butterfly cluster like lamellar BiOBr/TiO2 nanocomposite for enhanced sunlight photocatalytic mineralization of aqueous ciprofloxacin.
Sci Total Environ. 2019 May 15; 665:668-677.ST

Abstract

The present study for the first time reports facile in-situ room temperature synthesis of butterfly cluster like lamellar BiOBr deposited over TiO2 nanoparticles for photocatalytic breakdown of ciprofloxacin (CIP). The butterfly cluster arrangement of BiOBr resulted in an increase in surface area from 124.6 to 160.797 m2·g-1 and subsequently increased incident light absorption by the composite photocatalyst. The XRD indicated the existence of TiO2 as spherical ≈10-15 nm diameter particles with [101] preferential growth planes of anatase phase while the lamellar BiOBr showing growth along [110] and [102] preferential planes that were also confirmed by the HR-TEM images. DRS data implicated 2.76 eV as the energy band gap of the synthesized nanocomposite while PL spectroscopic analysis predicted it to be 2.81 eV. XPS measurements examined the chemical oxidation states of the constituents among the nanocomposite samples. The lameller structure of BiOBr in 15%BiOBr/TiO2 acts as a manifold promoting both visible light (λ > 420 nm) and direct sunlight catalytic degradation of 25 mg·L-1 aqueous CIP up to 92.5% and 100%, respectively within 150 min. The rate constant values suggested that the visible light photocatalysis of CIP with 15%BiOBr/TiO2 was 5.2 and 9.4 times faster compared to pristine TiO2 and BiOBr, respectively. The free radical scavenging study demonstrated that although photogenerated superoxide ions and holes contribute to the overall photocatalytic activity, yet, hydroxyl radicals predominantly control the CIP oxidation. The synthesized nanocomposite was re-used up to five cycles and retained 82.98% efficiency even after 5th use cycle showing a decline of only 12%. The catalyst stability and easy recovery adds to its reusability and value of the photocatalytic process.

Authors+Show Affiliations

Department of Environmental Science, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad 45320, Pakistan. Electronic address: jrashid@qau.edu.pk.Department of Environmental Science, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad 45320, Pakistan.Department of Pharmaceutical Sciences, Daniel K. Inouye College of Pharmacy, University of Hawaii at Hilo, Hilo, HI 96720, USA.Institute of Environmental Sciences and Engineering, School of Civil and Environmental Engineering, National University of Sciences and Technology, Sector H-12, Islamabad 44000, Pakistan.Department of Pharmacy, Quaid-i-Azam University, Islamabad 45320, Pakistan.Department of Chemistry, Inha University, South Korea.Department of Electrical Engineering, NUST College of Electrical and Mechanical Engineering, National University of Science and Technology (NUST), Islamabad 54000, Pakistan.National Center for Physics, Nano-Science & Technology Department, Quaid-i-Azam University, Islamabad, Pakistan.Magnetism Laboratory, COMSATS University, Park Road, Islamabad 45550, Pakistan.Department of Environmental Sciences, Faculty of Meteorology, Environment and Arid Land Agriculture, King Abdulaziz University, Jeddah 21589, Saudi Arabia; Central Metallurgical R&D Institute, Helwan 11421, Cairo, Egypt.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30776639

Citation

Rashid, Jamshaid, et al. "Butterfly Cluster Like Lamellar BiOBr/TiO2 Nanocomposite for Enhanced Sunlight Photocatalytic Mineralization of Aqueous Ciprofloxacin." The Science of the Total Environment, vol. 665, 2019, pp. 668-677.
Rashid J, Abbas A, Chang LC, et al. Butterfly cluster like lamellar BiOBr/TiO2 nanocomposite for enhanced sunlight photocatalytic mineralization of aqueous ciprofloxacin. Sci Total Environ. 2019;665:668-677.
Rashid, J., Abbas, A., Chang, L. C., Iqbal, A., Haq, I. U., Rehman, A., Awan, S. U., Arshad, M., Rafique, M., & Barakat, M. A. (2019). Butterfly cluster like lamellar BiOBr/TiO2 nanocomposite for enhanced sunlight photocatalytic mineralization of aqueous ciprofloxacin. The Science of the Total Environment, 665, 668-677. https://doi.org/10.1016/j.scitotenv.2019.02.145
Rashid J, et al. Butterfly Cluster Like Lamellar BiOBr/TiO2 Nanocomposite for Enhanced Sunlight Photocatalytic Mineralization of Aqueous Ciprofloxacin. Sci Total Environ. 2019 May 15;665:668-677. PubMed PMID: 30776639.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Butterfly cluster like lamellar BiOBr/TiO2 nanocomposite for enhanced sunlight photocatalytic mineralization of aqueous ciprofloxacin. AU - Rashid,Jamshaid, AU - Abbas,Ammara, AU - Chang,Leng Chee, AU - Iqbal,Aneela, AU - Haq,Ihsan Ul, AU - Rehman,Adeela, AU - Awan,Saif Ullah, AU - Arshad,Muhammad, AU - Rafique,Mohsin, AU - Barakat,M A, Y1 - 2019/02/11/ PY - 2018/10/11/received PY - 2019/01/03/revised PY - 2019/02/09/accepted PY - 2019/2/19/pubmed PY - 2019/4/9/medline PY - 2019/2/19/entrez KW - BiOBr KW - Ciprofloxacin KW - Heterojunction KW - Lamellae KW - Photocatalytic degradation KW - TiO(2) SP - 668 EP - 677 JF - The Science of the total environment JO - Sci. Total Environ. VL - 665 N2 - The present study for the first time reports facile in-situ room temperature synthesis of butterfly cluster like lamellar BiOBr deposited over TiO2 nanoparticles for photocatalytic breakdown of ciprofloxacin (CIP). The butterfly cluster arrangement of BiOBr resulted in an increase in surface area from 124.6 to 160.797 m2·g-1 and subsequently increased incident light absorption by the composite photocatalyst. The XRD indicated the existence of TiO2 as spherical ≈10-15 nm diameter particles with [101] preferential growth planes of anatase phase while the lamellar BiOBr showing growth along [110] and [102] preferential planes that were also confirmed by the HR-TEM images. DRS data implicated 2.76 eV as the energy band gap of the synthesized nanocomposite while PL spectroscopic analysis predicted it to be 2.81 eV. XPS measurements examined the chemical oxidation states of the constituents among the nanocomposite samples. The lameller structure of BiOBr in 15%BiOBr/TiO2 acts as a manifold promoting both visible light (λ > 420 nm) and direct sunlight catalytic degradation of 25 mg·L-1 aqueous CIP up to 92.5% and 100%, respectively within 150 min. The rate constant values suggested that the visible light photocatalysis of CIP with 15%BiOBr/TiO2 was 5.2 and 9.4 times faster compared to pristine TiO2 and BiOBr, respectively. The free radical scavenging study demonstrated that although photogenerated superoxide ions and holes contribute to the overall photocatalytic activity, yet, hydroxyl radicals predominantly control the CIP oxidation. The synthesized nanocomposite was re-used up to five cycles and retained 82.98% efficiency even after 5th use cycle showing a decline of only 12%. The catalyst stability and easy recovery adds to its reusability and value of the photocatalytic process. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/30776639/Butterfly_cluster_like_lamellar_BiOBr/TiO2_nanocomposite_for_enhanced_sunlight_photocatalytic_mineralization_of_aqueous_ciprofloxacin_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0048-9697(19)30633-3 DB - PRIME DP - Unbound Medicine ER -