In this study, TiO₂ functionalized with organic groups were prepared to study the effect of carboxyl and amino groups on the adsorption behavior of TiO₂ for the removal of acid red G (ARG) as an anionic dye from aqueous solution. TiO₂ was successfully modified with carboxyl and amino groups by using the hydrolysis method with oxalic acid (OAD, with two carboxyl groups), ethylenediamine (EDA, with two amino groups) and DL-alanine (DLA, with one carboxyl group and one amino group) at low temperature (65 °C) and labeled as OAD-TiO₂, EDA-TiO₂ and DLA-TiO₂, respectively. The ARG uptake by the functionalized TiO₂ samples was largely dependent on the functional groups. The interaction between ARG and the functional organic groups on the TiO₂ samples plays an important role in the adsorption process, which leads to the excellent adsorption performance (higher capacity and faster adsorption rate) of the functionalized TiO₂ samples than that of P25 (commercial TiO₂ without modification). Furthermore, there is no obvious loss of the adsorption capacity for the functionalized TiO₂ even after 5 adsorption-desorption cycles, which indicated the good reusability of the modified TiO₂ samples for anionic dye removal from aqueous solution.

在这项研究中，制备了被有机基团官能化的TiO ₂，以研究羧基和氨基对TiO ₂吸附行为的影响，该吸附行为可从水溶液中去除作为阴离子染料的酸性红G（ARG）。通过使用草酸（OAD，具有两个羧基），乙二胺（EDA，具有两个氨基）和DL-丙氨酸（DLA，具有一个羧基和一个氨基）的水解方法，成功地将羧基和氨基改性了TiO _2。组）在低温（65°C）下分别标记为OAD-TiO ₂，EDA-TiO ₂和DLA-TiO ₂。官能化TiO ₂对ARG的吸收样品很大程度上取决于官能团。ARG与TiO ₂样品上的官能有机基团之间的相互作用在吸附过程中起着重要作用，这导致功能化TiO ₂样品比P25（商业用）具有出色的吸附性能（更高的容量和更快的吸附速率）。TiO ₂未经改性）。此外，即使经过5次吸附-解吸循环，官能化TiO ₂的吸附容量也没有明显损失，这表明改性TiO ₂样品具有良好的可重用性，可从水溶液中去除阴离子染料。