HNO_(3)和NaOH改性椰壳活性炭吸附性能研究

Study on the adsorption performance of HNO_(3) and NaOH modified coconut shell activated carbon

为提高活性炭吸附性能,对椰壳活性炭进行HNO_(3)和NaOH改性,测定改性前后椰壳活性炭碘吸附值,研究表明:HNO_(3)改性后椰壳活性炭的碘吸附值降低20.81%;NaOH改性后椰壳活性炭的碘吸附值提高4.48%;两种改性方法对椰壳活性炭的总体吸附能力都有所改变,NaOH改性还可增强活性炭表面非极性和疏水性,改变表面化学性质,使NaOH改性的椰壳活性炭吸附能力比HNO_(3)改性活性炭更强。相关研究成果可为活性炭净化工业烟气NO_(3)和SO_(2)提供参考。

In order to improve the adsorption performance of activated carbon, coconut shell activated carbon was modified with nitric acid and sodium hydroxide. The iodine adsorption value of coconut shell activated carbon before and after modification was measured. The study shows that the iodine adsorption value of coconut shell activated carbon after nitric acid modification is reduced by 20.81%;After sodium hydroxide modification, the iodine adsorption value of coconut shell activated carbon is increased by 4.48%;the two modification methods have changed the overall adsorption capacity of coconut shell activated carbon, and NaOH modification can also enhance the non-polar and hydrophobic surface of the activated carbon. By changing the surface chemistry, the adsorption capacity of coconut shell activated carbon modified by sodium hydroxide is stronger than that of nitric acid modified activated carbon. Related research results can provide reference for the use of activated carbon to treat NO_(3) and SO_(2) in industrial flue gas.