Applied Chemistry for Engineering, Vol.28, No.6, 655-662, December, 2017
가시광선하에서 황화물계 광촉매를 이용한 로다민 B의 광분해 반응에 대한 무기염의 영향
Effect of Inorganic Salts on Photocatalytic Degradation of Rhodamine B Using Sulfide Photocatalysts under Visible Light Irradiation
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초록
CdS 및 CdZnS 황화물계 광촉매를 단순 침전법으로 제조하고, 가시광선 조사하에서의 로다민 B 분해반응에 대한 광촉 매로서의 활성을 조사하였다. 이때 KCl, NaCl, K3PO4, Na3PO4 등의 4가지 무기염 첨가가 반응에 미치는 영향을 조사하 였으며, 특히 광촉매 반응 과정에서의 K+, Na+, Cl- 그리고 PO4 3- 이온의 역할에 중점을 두고 연구를 진행하였다. 첨가 되는 무기염들은 전체 광촉매 반응에 큰 영향을 미칠 수 있다는 것을 알 수 있었다. 특히 무기염 중의 양이온에 비해 음이온이 반응속도에 상대적으로 큰 영향을 미치는 것으로 나타났다. 본 연구의 반응조건하에서 PO4 3- 음이온은 광촉매 반응속도를 크게 감소시키지만 Cl- 이온은 오히려 반응속도를 증가시켰다. 따라서 광촉매 반응을 이용한 폐수처리에 있어서는 다른 첨가물질의 영향을 고려하는 것도 필요한 것으로 판단된다.
Sulfide photocatalysts, CdS and CdZnS, were synthesized using a simple precipitation method and their photocatalytic activities were evaluated by the degradation of rhodamine B under visible light irradiation. The effects of four inorganic salt additives, KCl, NaCl, K3PO4, and Na3PO4, on the photocatalytic reaction were examined and the role of K+, Na+, Cl- and PO4 3- ions during photocatalytic reaction was discussed. The added inorganic salts were shown to have a remarkable effect on the photocatalytic reaction. It was also found that the anions in inorganic salts have a much more profound effect on the reactionr ate, as compared to the cations. Under the present experimental conditions, PO4 3- revealed a significant inhibitory effect on the degradation rate whereas Cl- enhanced the rate slightly. This work pointed out that the consideration of additive effects is needed in the photocatalytic reaction for wastewater treatment.
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