The important role of oxygen-containing groups of porous carbonaceous materials (PCMs) on sorption of organic compounds has been realized, but whether these groups can generate different joint effects, especially when oxidized PCMs with different pore sizes are complexed with heavy metals (Cu2+), remains ambiguous. The present study aimed to determine how pore sizes, metal ions, and oxygen-containing groups as a function affect the sorption of naphthalene and 2-naphthol to PCMs (e.g., activated carbons/ACs and mesoporous carbon/CMK-3). The H2-reduced oxidized PCMs were used as the control of low oxygen content to avoid changes in the pore structure properties compared with the oxidized PCMs. Oxygen-containing groups considerably decreased the sorption of naphthalene and 2-naphthol to PCMs because of their weaker hydrophobic interaction and fewer sorption sites. Notably, naphthalene sorption on oxidized AC was inhibited with Cu2+ because of the steric constraint of Cu2+ hydration shells of the micropores. However, pore blockage by Cu2+ reduced the mesopore size of oxidized CMK-3, leading to enhanced pore filling effect and cation-π bonding, and therefore increased naphthalene sorption. For 2-naphthol, the sorption to oxidized PCMs initially increased and then decreased with increasing Cu2+ concentration attributed to the fewer Cu2+ acting as a bridging agent and excess Cu2+ competing for sorption sites.

中文翻译：

---

萘和2-萘酚在多孔碳质材料上的吸附作用是孔径，金属和含氧基团的函数。

已经认识到多孔碳质材料（PCM）的含氧基团对有机化合物的吸附具有重要作用，但是这些基团是否会产生不同的联合效应，特别是当具有不同孔径的氧化PCM与重金属（Cu2 +）络合时，仍然模棱两可。本研究旨在确定孔径，金属离子和含氧基团如何影响萘和2-萘酚对PCM（例如活性炭/ AC和中孔碳/ CMK-3）的吸附。H 2还原的氧化PCM被用作低氧含量的控制，以避免与氧化PCM相比孔隙结构性质发生变化。含氧基团大大降低了萘和2-萘酚对PCM的吸附，因为它们的疏水相互作用较弱且吸附位点较少。值得注意的是，由于微孔中Cu2 +水合壳的空间约束，Cu2 +抑制了萘在氧化AC上的吸附。但是，Cu2 +堵塞的孔减小了氧化的CMK-3的中孔尺寸，从而提高了孔填充效果和阳离子-π键，从而增加了萘的吸附。对于2-萘酚，随着Cu2 +浓度的增加，对氧化PCM的吸附开始增加然后降低，这归因于较少的Cu2 +作为桥联剂，而过量的Cu2 +竞争了吸附位点。由于微孔中Cu2 +水合壳的空间约束，Cu2 +抑制了萘在氧化AC上的吸附。但是，Cu2 +堵塞的孔减小了氧化的CMK-3的中孔尺寸，从而提高了孔填充效果和阳离子-π键，从而增加了萘的吸附。对于2-萘酚，随着Cu2 +浓度的增加，对氧化PCM的吸附开始增加然后降低，这归因于较少的Cu2 +作为桥联剂，而过量的Cu2 +竞争了吸附位点。由于微孔中Cu2 +水合壳的空间约束，Cu2 +抑制了萘在氧化AC上的吸附。但是，Cu2 +堵塞了孔，降低了氧化的CMK-3的中孔尺寸，从而提高了孔填充效果和阳离子-π键，从而增加了萘的吸附。对于2-萘酚，随着Cu2 +浓度的增加，对氧化PCM的吸附开始增加然后降低，这归因于较少的Cu2 +作为桥联剂，而过量的Cu2 +竞争了吸附位点。