Hasan Najmul, Dalayoan Daryll J C, Lee Jaehyun, Lee Jongmin, Kim Jongseo, Bae Jong-Seong, Liu Chunli
Department of Physics and Oxide Research Center, Hankuk University of Foreign Studies Yongin 17035 Republic of Korea
Busan Center, Korea Basic Science Institute Busan 46742 Republic of Korea.
RSC Adv. 2021 Aug 4;11(43):26607-26619. doi: 10.1039/d1ra03278j. eCollection 2021 Aug 2.
Visible-light-sensitive Ag and Au nanocluster loaded BiO (Ag-BiO and Au-BiO) semiconductor photocatalysts have been synthesized. The composite materials exhibited increased photocatalytic degradation of the azo-dye pollutant, Methyl Orange (MO). In addition, Au-BiO (Au-7% wt) showed the highest MO degradation rate (0.05904 min) 7.69 times higher than the pristine BiO and 1.4 times higher than 1% Ag-BiO. The optical properties of the composites showed that the band gaps of the composite samples 1% Ag-BiO and 7% Au-BiO were 1.96 eV and 2.09 eV, respectively. The increase in the degradation rate is attributed to the decrease of the recombination rate of photoinduced e/h, caused by the enhanced charge transfer between the metal nanoparticles and BiO as confirmed in the photocurrent measurements. The photocurrent measurements showed increase in the transients output by 8.25 times and 2.75 times for 1% Ag-BiO & 3% Au-BiO, respectively as compared to that of the pristine BiO. These features further aided the increase in the photocatalytic efficiency while retaining the original physical properties, thus showing the robustness of BiO as a photocatalyst.
已合成了可见光敏感的负载银和金纳米团簇的BiO（Ag-BiO和Au-BiO）半导体光催化剂。这些复合材料对偶氮染料污染物甲基橙（MO）的光催化降解能力有所增强。此外，Au-BiO（Au含量为7%重量）表现出最高的MO降解速率（0.05904 min⁻¹），比原始BiO高7.69倍，比1% Ag-BiO高1.4倍。复合材料的光学性质表明，1% Ag-BiO和7% Au-BiO复合样品的带隙分别为1.96 eV和2.09 eV。降解速率的提高归因于光生电子/空穴复合率的降低，这是由金属纳米颗粒与BiO之间增强的电荷转移引起的，这在光电流测量中得到了证实。光电流测量表明，与原始BiO相比，1% Ag-BiO和3% Au-BiO的瞬态输出分别增加了8.25倍和2.75倍。这些特性进一步有助于提高光催化效率，同时保留原始物理性质，从而表明BiO作为光催化剂的稳健性。
