Institute of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450045, China; Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
Institute of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou, 450045, China.
Chemosphere. 2022 Feb;289:133138. doi: 10.1016/j.chemosphere.2021.133138. Epub 2021 Dec 1.
The electrochemical disinfection efficiency of Pseudomons putida was studied using ruthenium iridium coated titanium (RICT) electrode as anode and carbonized orange peel biochar (OPB) or graphite as the cathode. The results indicated that RICT/OPB system induced 6.5 and 7.0 log of P. putia inactivation after 60 s at 2 V and 45 s at 10 V, respectively. RICT/OPB system showed better efficiency than RICT/graphite system. The energy consumption of OPB cathode (17.5 Wh m per log) was significantly lower than that of graphite cathode (23.09 Wh m per log). Both anode and cathode played great roles on the disinfection. The anode absorbed electric energy to generate electrical hole, which can oxidize chloride ions to chlorine free radicals. The continuous porous structure of OPB can provide more adsorption sites and reduce electrolyte transport resistance, resulting in more Cl· production. Moreover, P. putia was much easier adsorbed to the anode surface in the RICT/OPB system because of the stronger electrostatic repulsion between cells and OPB cathode. As a result, P. putia was more easily inactivated by the Cl· produced on the anode. Besides chlorine active species, superoxide radical (O·﹣) produced on surface of cathode may also result in P. putia inactivation. The endogenous CuO in OPB can induce persistent free radicals (PFRs) production during pyrosis process. O·﹣ can be produced by O activation through the function of CuO/CuO and PFRs existed in OPB cathode. The more superoxide radical production led to the better disinfection effect than the graphite cathode. As a consequence, OPB electrode showed high efficiency electrochemical disinfection of P. putida.
采用钌铱涂覆钛（RICT）电极作为阳极，碳化橙皮生物炭（OPB）或石墨作为阴极，研究了铜绿假单胞菌的电化学消毒效率。结果表明，在 2 V 时，RICT/OPB 系统在 60 s 内诱导铜绿假单胞菌的失活对数达到 6.5，在 10 V 时，在 45 s 内诱导铜绿假单胞菌的失活对数达到 7.0。RICT/OPB 系统的效率优于 RICT/石墨系统。OPB 阴极的能耗（每对数 17.5 Wh m）明显低于石墨阴极（每对数 23.09 Wh m）。阳极和阴极在消毒过程中都发挥了重要作用。阳极吸收电能产生空穴，可将氯离子氧化为氯自由基。OPB 的连续多孔结构可以提供更多的吸附位点，并降低电解质传输阻力，从而产生更多的 Cl·。此外，由于细胞和 OPB 阴极之间更强的静电排斥，铜绿假单胞菌在 RICT/OPB 系统中更容易被吸附到阳极表面。因此，Cl·在阳极上产生的铜绿假单胞菌更容易失活。除了氯活性物质外，阴极表面产生的超氧自由基（O·﹣）也可能导致铜绿假单胞菌失活。OPB 中的内源性 CuO 在燃烧过程中可以诱导持久自由基（PFRs）的产生。O·﹣可以通过 CuO/CuO 的作用和 OPB 阴极中存在的 PFRs 来激活 O 产生。产生的超氧自由基越多，消毒效果越好，优于石墨阴极。因此，OPB 电极对铜绿假单胞菌具有高效的电化学消毒效果。
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