通过硝酸+微波加热和氨水吸附的方法对普通竹炭进行表面改性处理,运用红外图谱和元素分析对改性前后的竹炭进行表征。结果表明:含氧基团和含氮基团的含量明显增加。吸附试验结果表明:改性后竹炭对金属离子的吸附性能明显提高,其中,汞(Ⅱ)的吸附量提高25%以上,钯(Ⅱ)的吸附量提高32%以上,且吸附过程从以物理吸附为主转化为以化学吸附为主。
Surface of ordinary bamboo-charcoal was pretreated with nitric acid and microwave heating,ammonia. Fourier transform infrared(FTIR)spectrometer, elemental analysis measurements demonstrate that the contents of O-containing groups and N-containing groups on the bamboo-charcoal surface increase via HNO3 and NH3·H2O treatment. Results showed of adsorption that adsorption capacity of the modified bamboo-charcoal for metal ions were elevated remarkably. Among them, the mercury(Ⅱ)adsorption capacity increased by 25%, and palladium(Ⅱ)adsorption capacity increased by 32% or more. And the adsorption process was changed from the physical adsorption to the chemical adsorption. This study will expanded the applications of bamboo charcoal, and become into functional adsorption material.
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