废纸造纸污泥制备泥质炭吸附材料及其特性研究

Preparation of Carbon-based Adsorption Materials Using Papermaking Sludge and Its Characteristics

关键词:  造纸污泥  泥质炭  吸附材料

Key Words:papermaking sludge  sludge carbon  adsorption material

摘要:通过热解法探究了废纸造纸污泥制备泥质炭吸附材料的工艺条件，并对其热解固体产物特性进行了分析,发现造纸污泥经过研磨过筛预处理、ZnCl₂活化、中低温热解炭化、盐酸洗涤、研磨干燥后可制备出内部孔隙结构发达和比表面积高的优良吸附材料。结果表明,热解温度500℃,活化剂ZnCl₂浓度3 mol/L,热解时间30 min,固液比为1∶2时可制备出碘吸附值达610.3 mg/g、固体泥质炭得率为73.3%。泥质炭比表面积可达310.81 cm²/g,高于商品活性炭的159.58 cm²/g,中孔和大孔的比例较大,呈蜂窝结构,吸附性能大大增强,可替代商品活性炭用于工业废水的处理。

Abstract:This paper studied the pyrolysis process conditions for preparation of carbon-based adsorption material from paper sludge and its characteristics. It was found that after grinding/screening pre-processing, ZnCl₂ activation, low-temperature pyrolysis, hydrochloric acid washing, drying and grinding, paper sludge could be developed into excellent adsorption material with abundant internal pore structure and high specific surface area. The results showed that under the conditions of pyrolysis temperature 500℃, activator concentration 3 mol/L, pyrolysis time 30 mins, solid to liquid ratio 1∶2, the yield of solid carbon achieved 73.3% which had iodine adsorption value 610.3 mg/g. The specific surface area was up to 310.8 cm²/g, higher than 159.5 cm²/g of the commercial activated carbon. Its pore size about 40  and 100  was dominant, medium and large pores were in higher proportion capability. Its surface was uneven and had a cellular structure, which led to enhance its adsorption greatly. It could take the place of commencial activated carbon using in industrial waste water treatment.