Faculty of Agriculture and Food, Kunming University of Science & Technology, Kunming, People's Republic of China.
City College, Kunming University of Science & Technology, Kunming, People's Republic of China.
Environ Technol. 2021 Nov;42(27):4260-4268. doi: 10.1080/09593330.2020.1752815. Epub 2020 Apr 22.
The wide application of endocrine disruptors (EDs) has recently created great public concerns because of their toxicities. Previous studies have stated that the effect of oxygen-containing functional groups of carbon nanotubes (CNTs) for Bisphenol A (BPA) sorption, but no study has been quantified the exact contribution of the oxygen-containing functional groups. Moreover, the role of solvents on the adsorption of BPA should be considered. Considering the well properties of CNTs, graphitized (MG), carboxylated (MC) and hydroxylated (MH) multi-walled CNTs were selected as model adsorbents, BPA was used as model adsorbate. Solubility and single point adsorption coefficient (log) of BPA were n-hexadecane > water > methanol, suggesting that hydrophobic interaction was the main mechanism for BPA sorption on CNTs. For different functional groups of CNTs, π-π interaction between MH and BPA may be stronger than that of MC, and thus the sorption of BPA on MH was higher than that of MC. Moreover, hydrogen bond resulted in the higher adsorption of BPA on MH when compared with MC. The oxygen-containing functional groups of CNTs played a key role for BPA sorption in methanol because the values of contribution were 20%-45% for -OH and were 5%-25% for -COOH. In n-hexadecane, other factors such as hydrophobic interactions should be considered because the contribution percentages of -OH were ca.15% and the values for -COOH were ca.10%. The results are expected to provide important information on the interaction of EDs and CNTs.
内分泌干扰物（EDs）的广泛应用因其毒性而引起了公众的极大关注。先前的研究表明，含氧官能团的碳纳米管（CNTs）对双酚 A（BPA）吸附的影响，但没有研究量化含氧官能团的确切贡献。此外，还应考虑溶剂对 BPA 吸附的作用。考虑到 CNTs 的良好性能，选择了石墨化（MG）、羧基化（MC）和羟基化（MH）多壁 CNTs 作为模型吸附剂，BPA 作为模型吸附物。BPA 的溶解度和单点吸附系数（log）为正十六烷>水>甲醇，表明疏水相互作用是 BPA 在 CNTs 上吸附的主要机制。对于 CNTs 的不同官能团，MH 与 BPA 之间的π-π相互作用可能比 MC 更强，因此 BPA 在 MH 上的吸附高于 MC。此外，与 MC 相比，氢键导致 BPA 在 MH 上的吸附更高。CNTs 的含氧官能团对甲醇中 BPA 的吸附起着关键作用，因为-OH 的贡献值为 20%-45%，-COOH 的贡献值为 5%-25%。在正十六烷中，由于-OH 的贡献百分比约为 15%，-COOH 的值约为 10%，还应考虑其他因素如疏水相互作用。研究结果有望为 EDs 和 CNTs 的相互作用提供重要信息。
