Background

This investigation concerns the effectiveness of the heat/persulfate process in the degradation of Rhodamine B (RhB) in water.

Methods

The dependences of the efficiency and rate of degradation of RhB by the heat/persulfate process on the temperature, initial concentration of RhB, and Na₂S₂O₈ concentration were examined.

Significant findings

The degradation of RhB by the heat/persulfate process followed pseudo-first-order kinetics. The efficiency and rate of degradation of RhB at 70 °C dramatically exceeded those at 30 °C. At 70 °C, increasing the initial concentration of RhB reduced the efficiency and rate of degradation of RhB. At 70 °C, the efficiency and rate of degradation of RhB increased with Na₂S₂O₈ concentration. The heat/persulfate process at 70 °C with an initial concentration of RhB of 5 mg/L and an Na₂S₂O₈ concentration of 32 mM completely degraded RhB in 7 min, revealing that the heat/persulfate process is highly effective in the degradation of RhB in water.

中文翻译：

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热/过硫酸盐法降解水中罗丹明 B

背景

本研究涉及热/过硫酸盐过程在水中降解罗丹明 B (RhB) 的有效性。

方法

研究了热/过硫酸盐工艺降解RhB的效率和速率对温度、RhB初始浓度和Na ₂ S ₂ O ₈浓度的依赖性。

重要发现

热/过硫酸盐过程对 RhB 的降解遵循准一级动力学。RhB 在 70 °C 下的降解效率和速率显着超过 30 °C。在 70 °C 时，增加 RhB 的初始浓度会降低 RhB 的降解效率和速率。在 70 °C 时，RhB 的降解效率和速率随着 Na ₂ S ₂ O ₈浓度的增加而增加。在 70 °C 下，初始 RhB 浓度为 5 mg/L 和 Na ₂ S ₂ O ₈浓度为 32 mM 的加热/过硫酸盐过程在 7 分钟内完全降解了 RhB，表明加热/过硫酸盐过程在RhB在水中的降解。