磷酸活化法脱墨污泥活性炭的改性研究

Research on Modification of Activated Carbon from Deinking Sludge

中文关键词:  脱墨污泥  活性炭  改性  Cr（Ⅵ）离子吸附

Key Words:deinking sludge  activated carbon  activated carbon modifying  Cr（VI）ion adsorption

中文摘要:

      以Cr（Ⅵ）离子吸附效果为目标，对磷酸活化法制备的脱墨污泥活性炭进行改性。通过改性效果对比，确定了HNO₃改性方法，并对其改性工艺进行了优化。得到最佳改性条件为：10 mol/L的HNO₃作为改性剂、炭酸比1∶15（m∶V）、改性2.0 h。改性后活性炭用于废水吸附以去除Cr（Ⅵ）离子，在改性活性炭用量为5.00 g/L时，Cr（Ⅵ）离子的去除率和吸附量分别达到83.9%和25.17 mg/g，与未改性活性炭相比，吸附量提高了140.3%。改性活性炭的碘吸附值和亚甲基蓝吸附值分别达到543.92 mg/g和103.5 mg/g，碘吸附值提高了28.9%，而亚甲基蓝吸附值略有降低。N2吸附 脱附表明，与未改性活性炭相比，HNO₃改性活性炭比表面积从715.576 m2/g增至1020.161 m2/g，增大了42.6%；总孔容由0.353 cm3/g增长到0.608 cm3/g，提高了72.4%；中孔孔容由0.344 cm3/g增长到0.393 cm3/g，增长了14.2%。结果表明，HNO3改性可大幅提升脱墨污泥活性炭对Cr（Ⅵ）离子吸附性能。

Abstract:

      The activated carbon prepared from deinking sludge was modified and applied to the adsorption of Cr（VI）ion， the optimal modification conditions were determined as follows: modifier was 10 mol/L HNO₃， 1∶15 （m∶V）， modification time 2.0 h. The modified activated carbon was used to remove Cr（VI） ion from waste water. When the amount of modified activated carbon was 5 g/L， the removal rate and adsorption capacity of Cr（VI）ion were 83.9% and 25.17 mg/g， respectively， and the adsorption capacity increased by 140.3% compared with that of unmodified activated carbon， the iodine adsorption value and methylene blue adsorption value of the activated carbon were 543.92 mg/g and 103.5 mg/g respectively， the iodine adsorption capacity increased by 28.9%. The specific surface area of activated carbon was 1020.161 m2/g， increased by 42.6%， the total pore volume was about 0.608 cm3/g， increased by 72.4% and the mesopore volume was about 0.393 cm3/g， increased by 14.2%， based on the calculation by the N2 adsorption-desorption experiment．