Graphene-wrapped Ag3PO4/LaCO3OH heterostructures for water purification under visible light

doi:10.1016/j.jechem.2016.05.004

能源化学(英文) ›› 2016, Vol. 25 ›› Issue (5): 845-853.DOI: 10.1016/j.jechem.2016.05.004

Graphene-wrapped Ag₃PO₄/LaCO₃OH heterostructures for water purification under visible light

Santosh S. Patil^1,2, Mukund G. Mali³, Animesh Roy¹, Mohaseen S. Tamboli¹, Virendrakumar G. Deonikar¹, Deepak R. Patil¹, Milind V. Kulkarni¹, Salem S. Al-Deyab⁴, Sam S. Yoon³, Sanjay S. Kolekar², Bharat B. Kale¹

a Centre for Materials for Electronics Technology (C-MET), Department of Electronics and Information Technology (DeitY), Govt. of India, Pune, India;
b Analytical Chemistry and Material Science Laboratory, Department of Chemistry, Shivaji University, Kolhapur, MS India;
c Solar Cell & Aerosol Science Laboratory, School of Mech. Eng., Korea University, Seoul, South Korea and School of Chemical Sciences, Solapur University, Solapur, MS, India;
d Petrochemical Research Chair, Department of Chemistry, King Saud University, Riyadh, Saudi Arabia

收稿日期:2016-02-08 修回日期:2016-05-09 出版日期:2016-09-15 发布日期:2016-09-30
通讯作者: Sam S. Yoon, Sanjay S. Kolekar, Bharat B. Kale

Graphene-wrapped Ag₃PO₄/LaCO₃OH heterostructures for water purification under visible light

a Centre for Materials for Electronics Technology (C-MET), Department of Electronics and Information Technology (DeitY), Govt. of India, Pune, India;
b Analytical Chemistry and Material Science Laboratory, Department of Chemistry, Shivaji University, Kolhapur, MS India;
c Solar Cell & Aerosol Science Laboratory, School of Mech. Eng., Korea University, Seoul, South Korea and School of Chemical Sciences, Solapur University, Solapur, MS, India;
d Petrochemical Research Chair, Department of Chemistry, King Saud University, Riyadh, Saudi Arabia

Received:2016-02-08 Revised:2016-05-09 Online:2016-09-15 Published:2016-09-30
Contact: Sam S. Yoon, Sanjay S. Kolekar, Bharat B. Kale

摘要/Abstract

摘要： We demonstrated a unique synthesis approach of graphene (GR)-wrapped Ag₃PO₄/LaCO₃OH (APO/LCO) heterostructures by an in-situ wet chemical method. FESEM analysis reveals the formation of rhombic dodecahedrons of APO decorated with LCO and later wrapped with GR flakes. Optical studies shows two absorption edges corresponding to the band gap energies of APO (2.41 eV) and LCO (4.1 eV). Considering the absorption edge of the heterostructures in the visible region, the photocatalytic activities of photocatalysts containing different APO/LCO mass ratios were evaluated by the degradation of MB. GR-decorated composite with 20% LCO (APO/LCO20/GR) exhibited the highest photocatalytic activity for MB degradation, with a rate constant, k of 0.541 min^-1. The photocatalytic activity of APO/LCO20/GR more greatly enhanced than those of the individual constituents (APO, LCO, APO/LCO20). The enhanced photocatalytic activity of the heterostructure can be attributed to the co-catalytic effect of LCO as well as intriguing physicochemical properties of GR. To understand the enhanced photocatalytic activity of the heterostructures the photocatalytic reaction mechanism is proposed in detail. The recyclability of the APO/LCO/GR composite photocatalyst is further evaluated by reusing the catalyst in replicate photocatalytic experiments which shows consistent photocatalytic activity thereby confirms the stability and reusability of heterostructure photocatalyst.

关键词: Ag₃PO₄, LaCO₃OH, Graphene, Heterostructures, Photocatalytic MB degradation, Co-catalyst

Abstract: We demonstrated a unique synthesis approach of graphene (GR)-wrapped Ag₃PO₄/LaCO₃OH (APO/LCO) heterostructures by an in-situ wet chemical method. FESEM analysis reveals the formation of rhombic dodecahedrons of APO decorated with LCO and later wrapped with GR flakes. Optical studies shows two absorption edges corresponding to the band gap energies of APO (2.41 eV) and LCO (4.1 eV). Considering the absorption edge of the heterostructures in the visible region, the photocatalytic activities of photocatalysts containing different APO/LCO mass ratios were evaluated by the degradation of MB. GR-decorated composite with 20% LCO (APO/LCO20/GR) exhibited the highest photocatalytic activity for MB degradation, with a rate constant, k of 0.541 min^-1. The photocatalytic activity of APO/LCO20/GR more greatly enhanced than those of the individual constituents (APO, LCO, APO/LCO20). The enhanced photocatalytic activity of the heterostructure can be attributed to the co-catalytic effect of LCO as well as intriguing physicochemical properties of GR. To understand the enhanced photocatalytic activity of the heterostructures the photocatalytic reaction mechanism is proposed in detail. The recyclability of the APO/LCO/GR composite photocatalyst is further evaluated by reusing the catalyst in replicate photocatalytic experiments which shows consistent photocatalytic activity thereby confirms the stability and reusability of heterostructure photocatalyst.

Key words: Ag₃PO₄, LaCO₃OH, Graphene, Heterostructures, Photocatalytic MB degradation, Co-catalyst

Santosh S. Patil, Mukund G. Mali, Animesh Roy, Mohaseen S. Tamboli, Virendrakumar G. Deonikar, Deepak R. Patil, Milind V. Kulkarni, Salem S. Al-Deyab, Sam S. Yoon, Sanjay S. Kolekar, Bharat B. Kale. Graphene-wrapped Ag₃PO₄/LaCO₃OH heterostructures for water purification under visible light[J]. 能源化学(英文), 2016, 25(5): 845-853.

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Graphene-wrapped Ag₃PO₄/LaCO₃OH heterostructures for water purification under visible light

Graphene-wrapped Ag₃PO₄/LaCO₃OH heterostructures for water purification under visible light

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