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首页> 外文期刊>Journal of the Brazilian Chemical Society >Galvanostatic removal of Pb2+ ions from diluted solutions by the use of a membrane-less flow-through cell with stainless steel wool electrodes
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Galvanostatic removal of Pb2+ ions from diluted solutions by the use of a membrane-less flow-through cell with stainless steel wool electrodes

机译：使用带不锈钢羊毛电极的无膜流通池，从稀释溶液中恒流去除Pb2 +离子

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摘要

The removal of Pb2+ ions from dilute solutions was investigated under galvanostatic conditions using a membrane-less flow-through cell with stainless steel wool (SSW) electrodes. The response surface methodology (independent variables: electric current and volumetric flow rate) was used to find the optimal conditions for Pb2+ removal from 2 L of an aqueous solution of 50 mg L-1 Pb(NO3)2 in 0.10 mol L-1 NaNO3 + 0.10 mol L-1 H3BO3 (pH 4.8). The obtained response surfaces revealed that the volumetric flow rate (59-341 L h-1) does not substantially affect the Pb2+ removal process. On the other hand, the electric current increase led to higher Pb2+ removal, with significantly improved values of specific energy consumption and current efficiency when compared with those reported in the literature. For an experiment carried out in the optimum-condition region (70 mA and 200 L h-1), a Pb2+ conversion of 99.6% was attained after 90 min of electrolysis. The use of the membrane-less flow-through cell with SSW electrodes, besides being significantly more energy efficient, led to Pb2+ removal on both electrodes, but predominantly in the SSW anode, on which more than 95% of the Pb2+ ions were converted to PbO2.
机译：使用具有不锈钢羊毛（SSW）电极的无膜流通池，在恒电流条件下研究了从稀溶液中去除Pb2 +离子的方法。响应表面方法（独立变量：电流和体积流量）用于寻找从2 L的0.10 mol L-1 NaNO3中的50 mg L-1 Pb（NO3）2水溶液去除Pb2 +的最佳条件+ 0.10摩尔L-1 H3BO3（pH 4.8）。所获得的响应表面表明，体积流速（59-341 L h-1）基本上不影响Pb2 +的去除过程。另一方面，与文献报道相比，电流增加导致更高的Pb2 +去除率，比能量消耗和电流效率的值大大提高。对于在最佳条件区域（70 mA和200 L h-1）中进行的实验，电解90分钟后，Pb2 +的转化率为99.6％。带有SSW电极的无膜流通池的使用，不仅显着提高了能源效率，还导致两个电极上都去除了Pb2 +，但是主要是在SSW阳极上，在该阳极上，超过95％的Pb2 +离子转化为氧化铅

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