Adsorption kinetics and mechanisms of copper ions on activated carbons derived from pinewood sawdust by fast H3PO4 activation

作者：Gao, Xinyuan; Wu, Long; Xu, Qing; Tian, Wei; Li, Zhanyong^*; Kobayashi, Noriyuki

来源：Environmental Science and Pollution Research, 2018, 25(8): 7907-7915.

DOI：10.1007/s11356-017-1079-7

• Activated carbon
• Fast H3PO4 activation
• Copper adsorption
• Adsorption mechanisms
• Carboxyl groups
• P-containing groups

Two kinds of pinewood sawdust activated carbon adsorbents were prepared by fast activation with H3PO4 in a spouted bed, and the application in adsorption of copper ions was investigated. With only 3 min of activation time, the BET surface area of activated carbons reached 1537.5 m(2)/g for impregnation mass ratio of H3PO4 to sawdust at 1:1 and activation temperature of 500 degrees C (IR1-500), whereas it was 1750.7 m(2)/g for the impregnation ratio at 4:1 and activation temperature of 800 degrees C (IR4-800). The pseudo second-order reaction kinetics well describes the experimental adsorption of copper ion in this study, indicating chemisorption dominated in the process. By the C-1s spectrum, activated carbons from IR1-500 contained more carboxyl groups (-COOH) and carbonyl groups (C=O), which played an important role in copper ions adsorption. In addition, it was found that the P-containing groups (metaphosphates) also involved in the adsorption of copper ion.

• 出版日期2018-3
• 单位天津科技大学