Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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A Study on Pd-based Electrode prepared by using Electroless Plating Method

무전해도금법을 이용한 Pd 기반 전극·제조에 관한 연구

  • Hwang, In Hyuck (Department of Environmental Energy Engineering, Graduate school of Kyonggi University) ;
  • Lee, Dong Yoon (Department of Environmental Energy Systems Engineering, Kyonggi University) ;
  • Kim, Sung Su (Department of Environmental Energy Systems Engineering, Kyonggi University)
  • 황인혁 (경기대학교 일반대학원 환경에너지공학과) ;
  • 이동윤 (경기대학교 환경에너지공학과) ;
  • 김성수 (경기대학교 환경에너지공학과)
  • Received : 2018.12.10
  • Accepted : 2018.12.25
  • Published : 2018.12.31
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Abstract

In this study, Ti-mesh based electrodes were fabricated for the application of anode to the electrolysis process for wastewater treatment using Pd electroless plating method. The removal performance of the prepared Pd / Ti-mesh electrode was evaluated as representative dye RO16, and the durability and performance were maximized by varying the electrode manufacturing conditions. As a result, it was confirmed that the coating condition had no significant effect on the performance, and that the heat treatment process greatly affected the performance and the durability was improved. In addition, we tried to maximize performance and durability by complexing Ir, Ru, and Ta. However, as the thickness of the layer increased due to the limitation of the coating method, the resistance increased and the performance decreased accordingly.

본 연구에서는 무전해도금법을 이용한 Pd coating 기술을 활용하여 폐수처리를 위한 전기분해 공정에 anode로의 적용을 목적으로 Ti-mesh 기반 전극을 제조하였다. 제조된 Pd/Ti-mesh 전극은 염색염료인 RO16을 대표로 그 제거성능을 평가하였으며, 전극 제조조건을 다르게 하여 내구성 및 성능을 극대화한 결과 coating 조건은 성능에 크게 영향을 미치지 않았지만, Pd coating 후 열처리 공정의 경우 성능에 크게 영향을 미쳤으며, 내구성 역시 증진됨을 확인하였다. 또한 Ir, Ru, Ta을 복합화하여 성능 및 내구성을 극대화하고자 하였으나, coating법의 한계로 layer의 thickness가 증가함에 따라 저항이 커졌으며, 이에 따라 성능이 감소함을 확인하였다.

Keywords

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Fig. 1. Manufacturing step of palladium electroless plating.

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Fig. 2. Manufacturing step of Ir-Ru-Ta/Ti-mesh using brush coating.

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Fig. ３. Schematic diagram of electro-chemical reactor.

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Fig. 4. RO16 removal performance of DSA and Pd/Ti electrodes, capacity = 1 L, RO16 concentration = 10 ppm, electrolyte type and concentration = Na2SO4 0.07 mol/L, electrode size = 20 × 40 mm, distance between the electrodes = 55 mm, current density = 0.04 A/cm2, reaction time = 1 h, temperature = 21 ℃.

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Fig. 5. Effect of temperature in Pd-plating conditions on performance of RO16 removal using Pd/Ti-mesh electrodes, A: 25 ℃, B: 55 ℃, C: 85 ℃, capacity = 1 L, RO16 concentration = 10 ppm, electrolyte type and concentration = Na2SO4 0.07 mol/L, electrode size = 20 × 40 mm, distance between the electrodes = 55 mm, current density = 0.04 A/cm2, reaction time = 1 h, temperature = 21 ℃.

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Fig. 6. Effect of heat treatment on performance of RO16 removal using Pd/Ti-mesh electrodes, A: before heat treatment, B: after heat treatment, capacity = 1 L, RO16 concentration = 10 ppm, electrolyte type and concentration = Na2SO4 0.07 mol/L, electrode size = 20 × 40 mm, distance between the electrodes = 55 mm, current density = 0.04 A/cm2, reaction time = 1 h, temperature = 21 ℃.

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Fig. 7. Effect of temperature in heat treatment conditions on performance of RO16 removal using Pd/Ti-mesh electrodes, capacity = 1 L, RO16 concentration = 10 ppm, electrolyte type and concentration = Na2SO4 0.07 mol/L, electrode size = 20 × 40 mm, distance between the electrodes = 55 mm, current density = 0.04 A/cm2, reaction time = 1 h, temperature = 21 ℃.

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Fig. 8. Effect of Pd and Ir-Ru-Ta layer of RO16 removal, capacity = 1 L, RO16 concentration = 10 ppm, electrolyte type and concentration = Na2SO4 0.07 mol/L, electrode size = 20 × 40 mm, distance between the electrodes = 55 mm, current density = 0.04 A/cm2, reaction time = 1 h, temperature = 21 ℃.

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Fig. 9. Effect of layer in coating conditions on performance of RO16 removal using A, B, C, and DSA electrodes, A: Pd/Ir-Ru-Ta/Ti-mesh, B: Ir-Ru-Ta/Pd/Ti-mesh, C: Ir-Ru-Ta/Pd/Ir-Ru-Ta/Ti-mesh, capacity = 1 L, RO16 concentration = 10 ppm, electrolyte type and concentration = Na2SO4 0.07 mol/L, electrode size = 20 × 40 mm, distance between the electrodes = 55 mm, current density = 0.04 A/cm2, reaction time = 1 h, temperature = 21 ℃.

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Fig. 10. Longevity test of Pd/Ir-Ru-Ta/Ti anode, capacity = 1 L, RO16 concentration = 10 ppm, electrolyte type and concentration = Na2SO4 0.07 mol/L, electrode size = 20 × 40 mm, distance between the electrodes = 55 mm, current density = 0.04 A/cm2, reaction time = 10 h, temperature = 21 ℃.

Table 1. Conditions of palladium electroless plating.

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Table 2. Conditions of Ir-Ru-Ta coating solution

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Table 3. Conditions of electrolysis process

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Table 4. RO16 UV absorption analysis conditions

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Table 5. IC/ICP result of electrolyzed RO16 wastewater using DSA and Pd/Ti-mesh electrodes

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Table 6. IC/ICP result of electrolyzed RO16 wastewater using DSA and Pd/Ti-mesh electrode in various plaiting temperature conditions

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Table 7. IC/ICP result of electrolyzed RO16 wastewater using Pd/Ti-mesh electrode in various heat treatment temperature conditions

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