| 학회 | 한국재료학회 |
| 학술대회 | 2016년 가을 (11/16 ~ 11/18, 경주 현대호텔) |
| 권호 | 22권 2호 |
| 발표분야 | E. 환경/센서 재료 분과 |
| 제목 | Utilization of visible to NIR light energy by Yb+3, Er+3 and Tm+3 doped BiVO4 for photocatalytic degradation of an organic dye |
| 초록 | As a green chemistry technology, photocatalysis has been regarded not only as a cost-effective technology for decomposing organic pollutants completely into harmless chemicals, but also as a promising alternative for solar energy utilization [1,2]. It is well known that 50 % solar spectrum is occupied by near-infrared light whereas rest of the other 50 % is occupied by UV and visible light. Efficient harvesting and utilization of wide range of solar spectrum energy from UV to NIR for photocatalytic development is very challenging. Different efforts have been made to utilize UV and visible light energy but only few works have been done to utilize NIR light. As a result the larger fraction of solar energy (NIR) is being exploited. Hence the development of an UV–visible-near infrared (UV-Vis-NIR) broad light spectrum photocatalyst should be a high priority for practical photo–electric conversion materials [3-5]. A highly efficient visible as well as NIR light responsive photocatalyst was developed by addition of rare earth metal ions on BiVO4 semiconductor. The structural, morphological as well as optical properties of the samples were evaluated by SEM, XRD, Raman spectroscopy, XPS, UV-Vis diffuse reflectance spectroscopy (DRS), Photoluminescence spectroscopy (PL). The stability as well as the toxicity of the sample were examined and found to be highly stable towards photocorrosion and non-toxic. Photocatalytic activities of all the prepared samples were evaluated for the degradation of methylene blue in aqueous solution under visible light followed by NIR light irradiation. The obtained samples exhibits dramatically enhanced performance in degradation of dye under full spectrum light illumination. The highest activity was obtained by the sample BiVO4-Yb+3-Er+3-Tm+3 having 6:3:3 mole percentage ratio of rare earth respectively. The improved property may be due to the synergistic effect of morphology and up-conversion mechanism involved in the overall photocatalytic process. |
| 저자 | Chhabilal Regmi, 이수완 |
| 소속 | 선문대 |
| 키워드 | NIR; BiVO4; photocatalytic |
