Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Effect of Inorganic Salts on Photocatalytic Degradation of Rhodamine B Using Sulfide Photocatalysts under Visible Light Irradiation

가시광선하에서 황화물계 광촉매를 이용한 로다민 B의 광분해 반응에 대한 무기염의 영향

  • Lee, Gun Dae (Department of Industrial Chemistry, Pukyong National University) ;
  • Jin, Youngeup (Department of Industrial Chemistry, Pukyong National University) ;
  • Park, Seong Soo (Department of Industrial Chemistry, Pukyong National University) ;
  • Hong, Seong Soo (Department of Chemical Engineering, Pukyong National University)
  • Received : 2017.08.29
  • Accepted : 2017.09.27
  • Published : 2017.12.10
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Abstract

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, $K_3PO_4$, and $Na_3PO_4$, on the photocatalytic reaction were examined and the role of $K^+$, $Na^+$, $Cl^-$ and $PO_4{^{3-}}$ 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 reaction rate, as compared to the cations. Under the present experimental conditions, $PO_4{^{3-}}$ 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.

CdS 및 CdZnS 황화물계 광촉매를 단순 침전법으로 제조하고, 가시광선 조사하에서의 로다민 B 분해반응에 대한 광촉매로서의 활성을 조사하였다. 이때 KCl, NaCl, $K_3PO_4$, $Na_3PO_4$ 등의 4가지 무기염 첨가가 반응에 미치는 영향을 조사하였으며, 특히 광촉매 반응 과정에서의 $K^+$, $Na^+$, $Cl^-$ 그리고 $PO_4{^{3-}}$ 이온의 역할에 중점을 두고 연구를 진행하였다. 첨가되는 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 $PO_4{^{3-}}$ 음이온은 광촉매 반응속도를 크게 감소시키지만 $Cl^-$ 이온은 오히려 반응속도를 증가시켰다. 따라서 광촉매 반응을 이용한 폐수처리에 있어서는 다른 첨가물질의 영향을 고려하는 것도 필요한 것으로 판단된다.

Keywords

References

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