Pd이 삽입된 TiO2 광촉매의 광학 특성 및 페놀 분해 성능 평가

도정연; 김태호; 심환석; 정하민; 최재훈; 강미숙; Jeong Yeon Do; Teho Kim; Hwanseok Sim; Hamin Jeong; Jae Hoon Choi; Misook Kang

Applied Chemistry for Engineering, Vol.28, No.5, 547-553, October, 2017

DOI10.14478/ace.2017.1070 Export Citation

Pd이 삽입된 TiO2 광촉매의 광학 특성 및 페놀 분해 성능 평가

Optical Properties and Phenol Destruction Performance of Pd-inserted TiO2 Photocatalysts

도정연, 김태호¹, 심환석¹, 정하민¹, 최재훈¹, 강미숙 ^†

영남대학교 자연과학대학 화학과
¹대구과학고등학교

Jeong Yeon Do, Teho Kim¹, Hwanseok Sim¹, Hamin Jeong¹, Jae Hoon Choi¹, and Misook Kang^†

Department of Chemistry, College of Natural Sciences, Yeungnam University, Gyeongsan, Gyeongbuk 38541, Republic of Korea
¹Daegu Science High School, Daegu 42110, Republic of Korea

E-mail:

초록

본 연구는 TiO2 골격에 Pd을 삽입시켰을 때 나타나는 광 촉매 성능의 차이에 초점을 두고, TiO2와 x mol% Pd-TiO2 (x = 0.25, 0.5, 0.75 그리고 1.0)의 5가지 촉매를 제안하였다. 전형적인 졸-겔 방법을 사용하여 촉매를 합성하고 각 촉매의 페놀 광 분해 성능을 평가하였다. XRD, TEM, SEM/EDS, UV/Vis 분광법, 광 발광 분광법 등을 이용하여 촉매의 물리화학적 특성을 확인하였고, 광 발광 분광법 및 광 전류 측정으로 광학적 특성을 확인하였다. Pd 이온을 첨가하면 촉매의 밴드 갭이 감소하고, 광 생성된 전자와 정공 사이의 전하 분리가 쉽게 발생한다. 결과적으로, 0.75 mol% Pd-TiO2 촉매상의 페놀 광 분해 성능은 순수한 TiO2보다 3배 더 높았는데, 이는 광 촉매 반응 중에 Pd 이온이 전자 캡쳐 역할을 하여 일어난 결과로 여겨진다.

This study focused on the difference of photocatalytic performance by the incorporation of Pd into the TiO2 framework and suggested five different catalysts composed of TiO2 and x mol% Pd-TiO2 (x = 0.25, 0.5, 0.75, and 1.0). A typical sol-gel method was used to synthesize catalysts, and the phenol photodegradation performance of each catalysts was evaluated. The physicochemical and optical properties of catalysts were confirmed by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy/energy dispersive spectrometer (SEM/EDS), ultraviolet/visible spectroscopy (UV/Vis), photoluminescence spectroscopy (PL), and photocurrent measurements. With the addition of Pd ions, the band gap of catalysts was shortened and the charge separation between photogenerated electrons and holes easily also occurred. As a result, the phenol photo-destruction performance over 0.75 mol% Pd-TiO2 catalyst was 3 times higher than that of pure TiO2. This is believed to be due to Pd ions acted as an electron capturing function during photocatalysis.

Keywords:photodegradation;phenol;photocatalysts;Pd-TiO2;effective charge separation

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[4] Muhammad A, Shafeeq A, Butt MA, Rizvi ZH, Chughtai MA, Rehman S, J. Chem. Eng., 25, 453 (2008)

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