用于吸附水中硫酸根的聚吡咯改性活性炭制备及再生工艺条件优化研究

Preparation and regeneration conditions optimization of polypyrrole modified activated carbon for sulfate adsorption in water

以颗粒活性炭为载体,在FeCl_(3)氧化合成聚吡咯(PPy)过程中掺入苯磺酸钠(BSNa)制备了改性活性炭PFB-GAC。考察了BSNa投加条件对SO_(4)^(2-)吸附的影响;分别选用典型碱性和还原性物质为再生剂,对再生条件和机理进行研究。结果表明,在FeCl_(3)氧化3 h后投加10^(-3)mol/L BSNa制备的PFB-GAC吸附量可达20.45 mg/g。由于NH_(3)·H_(2)O的缓释能力,12 mol/L时比相同羟基含量的NaOH脱附率高1.6倍(80.25%),富集浓度达3.05 g/L;2 mol/L Na_(2)SO_(3)脱附率达70%,富集浓度达2.37 g/L。基于OH^(-)对基团的作用,或者还原剂给电子作用,都能使SO_(4)^(2-)有效脱附。

The modified activated carbon PFB-GAC was prepared by using granular activated carbon as the carrier and adding sodium benzene sulfonate(BSNa)in the process of FeCl_(3)oxidation to polypyrrole(PPy).The effects of BSNa addition conditions on SO_(4)^(2-) adsorption were investigated.Typical alkaline and reductive substances were selected as regeneration agents to study the regeneration conditions and mechanism.The results showed that the adsorption capacity of PFB-GAC prepared by adding 10^(-3)mol/L BSNa after FeCl_(3)oxidation for 3 h reached 20.45 mg/g.Due to the sustained-release ability of NH_(3)·H_(2)O,the desorption rate of 12 mol/L NH_(3)·H_(2)O was 1.6 times(80.25%)higher than that of NaOH with the same hydroxyl content and the enrichment concentration was 3.05 g/L.2 mol/L Na_(2)SO_(3)desorption rate was 70%and enrichment concentration was 2.37 g/L.SO_(4)^(2-) can be effectively desorbed based on the effect of OH^(-) on groups or the electron-donating effect of reducing agent.