污泥基活性炭孔隙率低下是污泥资源化利用的主要制约因素,而Fenton法预处理污泥,可有效改善活性炭性质。通过考察H202投加量、H202/Fe2+、活化pH以及炭化条件等参数,确定了最佳污泥基活性炭制备条件:H202投加量为5%(质量分数),H2O2/Fe2+为5:1(质量比),活化pH为3,活化时间为2.0h,污泥含固率为1.0%(质量分数),炭化温度为600℃,炭化时间为2.0h。炭化升温速率为10℃/min。此时,得到的污泥基活性炭吸附碘值为340mg/g,比表面积为353.563m2/g,孔容积为0.238cm2/g,微iL容积为0.095cm3/g。该活性炭对阳离子和阴离子染料(亚甲基蓝和甲基橙)具有良好的吸附性能,结果表明,对亚甲基蓝和甲基橙的吸附更符合Langmuir方程,且其饱和吸附量分别为71.53、57.73mg/g。对吸附动力学的拟合结果表明,该吸附更符合二级动力学方程。
Low porosity of sludge based activated carbon was the main restriction factor of resourceful utilizations of sludge. Fenton pretreatment of sludge can effectively improve the properties of sludge based activated carbon. By exploring the effect of H2O2 dosage, H2 O2/Fe2+ , pH and carbonization temperature on properties of obtained acti- vated carbon, the optimal preparation parameters were obtained as follow: H2O2 dosage was 5% (mass fraction), H2O2/Fe2+ was 5 : 1 (mass ratio) ,active pH was 3,activation time was 2.0 h,solid content of sludge was 1.0% and carbonization conditions were 600 Y2,2.0 h and carbonization heating rate of 10 ℃/min. The product formed under the optimal conditions had the iodine adsorption value of 340 mg/g,BET surface area of 353. 563 ms/g, the total and micro pore volume calculated from BJH model were 0. 238,0. 095 cm3/g respectively. The prepared active carbon had perfect adsorption capacity for both acid and cationic dye (methyl blue and methyl orange),the adsorption data could be well described by Langmuir equation,and the maximum adsorption amounts of methyl blue and methyl orange were 71.53,57.73 mg/g. Kinetic research showed that the adsorption was in line with quasi:second-order kinetic model.