STEP Wastewater Treatment: A Solar Thermal Electrochemical Process for Pollutant Oxidation
STEP Wastewater Treatment: A Solar Thermal Electrochemical Process for Pollutant Oxidation
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STEP 废水处理：用于污染物氧化的太阳能热电化学工艺
DOI：
10.1002/cssc.201200305
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发表时间：
2012-01-01
期刊：
影响因子：
8.4
通讯作者：
Licht, Stuart
中科院分区：
文献类型：
--
作者：
Wang, Baohui;Wu, Hongjun;Licht, Stuart
建立了太阳能热电化学生产（STEP）途径，以利用太阳能驱动有用的化学过程。在本文中，我们使用实验化学有效的STEP废水处理，并提出了一个理论的基础上降低稳定性的有机污染物（烃氧化电位）随着温度的升高。以苯酚的太阳能热电化学氧化为例，该过程的基本模型和实验系统组件概述了将环境稳定的有机污染物氧化成易于去除的二氧化碳的一般方法。使用热力学计算，我们表明，随着温度的升高，苯酚氧化电位急剧下降。实验结果表明，这种增加的温度可以由太阳能热加热提供。结合起来，这通过以下方式驱动电化学苯酚去除：（i）催化驱动的为该过程提供燃料所需的能量的降低和（ii）改善的动力学以在低电化学过电位下维持高苯酚氧化速率，从而提高氧化效率。STEP废水处理过程是协同的，因为它比单独作用的电化学或光伏转换过程具有更高的效率。STEP是一种完全由太阳能驱动的绿色、高效、安全和可持续的有机废水处理工艺。
A solar thermal electrochemical production (STEP) pathway was established to utilize solar energy to drive useful chemical processes. In this paper, we use experimental chemistry for efficient STEP wastewater treatment, and suggest a theory based on the decreasing stability of organic pollutants (hydrocarbon oxidation potentials) with increasing temperature. Exemplified by the solar thermal electrochemical oxidation of phenol, the fundamental model and experimental system components of this process outline a general method for the oxidation of environmentally stable organic pollutants into carbon dioxide, which is easily removed. Using thermodynamic calculations we show a sharply decreasing phenol oxidation potential with increasing temperature. The experimental results demonstrate that this increased temperature can be supplied by solar thermal heating. In combination this drives electrochemical phenol removal with enhanced oxidation efficiency through (i) a thermodynamically driven decrease in the energy needed to fuel the process and (ii) improved kinetics to sustain high rates of phenol oxidation at low electrochemical overpotential. The STEP wastewater treatment process is synergistic in that it is performed with higher efficiency than either electrochemical or photovoltaic conversion process acting alone. STEP is a green, efficient, safe, and sustainable process for organic wastewater treatment driven solely by solar energy.