Abstract: Using Pb2+ water as treatment object and Na2S·9H2O as precipitant, the optimum conditions for removing Pb2+ without existence of carrier are obtained by means of single factor method.Under the same conditions, the inducing effects of quartz sand, feldspar and dolomite on PbS precipitation and Zeta potential changes are investigated.The isoelectric point of quartz sand, feldspar and dolomite in deionized water system, Pb2+ containing water system and precipitation system respectively are measured.The correlation between induction effect and Zeta potential in precipitation process as well as the isoelectric point of carriers in different systems are analyzed.It is found that dolomite gives the biggest induction effect, feldspar comes next and quartz sand brings the smallest.Two induction effect indexes including the time for precipitation equilibrium and Pb2+ equilibrium concentration both are related to the Zeta potential of the carrier in the induced precipitation process.As the Zeta potential of carrier is negative and is closer to the isoelectric state, the induction effect is the better, which can be the accordance to select the best carrier.In the deionized water system, the Pb2+ water distribution system and the precipitation system, the greater the carrier isoelectric point, the better the effect in inducing PbS precipitation, which can help to select the best carrier.The deionized water system is the most convenient system to determine the carrier isoelectric point and it can be used as the best system and method for the selection of carrier.
孙丽, 陈平. 诱导沉淀除Pb2+载体选择方法的研究[J]. 现代化工, 2018, 38(10): 127-130.
SUN Li, CHEN Ping. Study on selection method of carrier for removing Pb2+ by inducing precipitation. Modern Chemical Industry, 2018, 38(10): 127-130.
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