Preparation of biochar from Chinese medicine residue and electrochemical detection of Cd(Ⅱ)in water
The heavy metals contained in wastewater,waste gas and solid waste are discharged into the natural environment,which will lead to serious heavy metals exceeding the standard and pollution,and cause serious harm to the human body.In this study,a series of nitrogen-doped biochar with mesoporous structure was prepared by hydrothermal method using waste Chinese medicine residue as carbon source and urea as nitrogen source,and an effective new electrochemical sensor was constructed to detect Cd2 in water.The structure,morphology and electrochemical properties of biochar materials were characterized and tested by cyclic voltammetry(CV)and chronoamperometry(CA).The results showed that the material with a carbon-nitrogen mass ratio of 1∶1 was used to modify the working electrode.Under the conditions of Cd2+concentration of 0.08 mM,pH=5 electrolyte,the deposition potential of-2.4 V at 240 s,and the scanning speed of 0.025 V·s-1,the detection effect of Cd2+in water was the best.This study opens up a new path for the recycling of traditional Chinese medicine waste,and is expected to provide a rapid and sensitive monitoring method for heavy metals,which has important value for environmental protection and public health.
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