Kam Chun Sing, Leung Tik Lun, Liu Fangzhou, Djurišić Aleksandra B, Xie Mao Hai, Chan Wai-Kin, Zhou Ying, Shih Kaimin
Department of Physics, The University of Hong Kong Pokfulam Hong Kong
Department of Chemistry, The University of Hong Kong Pokfulam Hong Kong.
RSC Adv. 2018 May 18;8(33):18355-18362. doi: 10.1039/c8ra02264j. eCollection 2018 May 17.
We have investigated lead adsorption on different forms of nanostructured carbon, namely multiwall carbon nanotubes (MWCNT) and reduced graphene oxide (RGO) functionalized with different functional groups (hydroxyl, carboxyl, and amino groups). We found that the same functional group does not result in the same performance trends for different nanostructured carbons. Drastically different behavior was observed for the amino-group functionalization, where a significant improvement is observed for MWCNT, while worse performance compared to non-functionalized material is obtained for RGO. On the other hand, hydroxyl and carboxyl group functionalization improves the lead adsorption regardless of the form of carbon. The best performing RGO sample, namely carboxyl group functionalized one, exhibited maximum lead adsorption capacity of 298.49 mg g which was significantly higher than that of the best performing MWCNT sample (amino-functionalized MWCNT, 58.547 mg g).
我们研究了铅在不同形式的纳米结构碳上的吸附情况，即多壁碳纳米管（MWCNT）和用不同官能团（羟基、羧基和氨基）功能化的还原氧化石墨烯（RGO）。我们发现，相同的官能团对不同的纳米结构碳并不会产生相同的性能趋势。对于氨基功能化，观察到了截然不同的行为，其中MWCNT有显著改善，而RGO与未功能化材料相比性能更差。另一方面，羟基和羧基功能化无论碳的形式如何都能提高铅的吸附。表现最佳的RGO样品，即羧基功能化的样品，展现出298.49 mg/g的最大铅吸附容量，这显著高于表现最佳的MWCNT样品（氨基功能化MWCNT，58.547 mg/g）。
