e-Journal of Surface Science and Nanotechnology
Online ISSN : 1348-0391
ISSN-L : 1348-0391

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Significantly Enhanced Photocatalytic Performance of Ag-doped Calcium Aluminate under Visible-light Irradiation
Qianmin Cong Zizhan SunXiaoyu WangXu ZhangJiayin CuiZhengyu CaiChuangang FanLizhai Pei
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JOURNAL OPEN ACCESS Advance online publication
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Article ID: 2023-071

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Abstract

Ag-doped Ca aluminate with different Ag dopant content and polycrystalline structure were obtained via a direct one-step chemical approach using Ag acetate as Ag doping source. Ag-doped Ca aluminate is composed of orthorhombic Ca5Al6O14 and monoclinic CaAl2O4 phases. The morphology transformation of Ag-doped Ca aluminate from nanoflakes to microscale and nanoscale particles closely depends on Ag dopant content. Ag doping effectively improves visible-light absorption ability and 8 wt% Ag-doped Ca aluminate exhibits the lowest band gap of 1.97 eV. Ag-doped Ca aluminate shows enhanced visible-light photocatalytic activity towards gentian violet than un-doped Ca aluminate under natural sunlight irradiation. 20 mL gentian violet solution (10 mg L−1) is totally degraded using 20 mg of 8 wt% Ag-doped Ca aluminate with sunlight irradiation for 30 min and reaction rate constant k of 0.034 min−1. Visible-light photocatalytic activity is greatly enhanced by Ag doping owing to narrow band gap, low recombination efficiency of charge carriers, high charge transfer efficiency.

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