Formaldehyde is a common indoor environmental pollutant, which poses a great harm to human body. In this study, the adsorption behavior of a novel polyaniline/TiO₂ (PANI/TiO₂) for formaldehyde from air at room temperature, comparing to that of activated carbon and glass beads, was investigated, and the mechanism was interpreted in details. Polyaniline/TiO₂ exhibited enhanced adsorption capacity of 0.67 mg g⁻¹ for formaldehyde acquired from the Langmuir equation, which was higher than that of commercially used activated carbon of 0.50 mg g⁻¹. While polyaniline/TiO₂ could also be stably recycled by using simple acid-base treatment. Moreover, the initial adsorption rate order of polyaniline/TiO₂>activated carbon > glass beads was acquired from kinetic study, confirming the superiority in the formaldehyde removal of our polyaniline/TiO₂. Confirmed by adsorption isotherm study and various characterization experiments including X-ray photoelectron spectroscopy(XPS), Fourier transform infrared spectroscopy(FT-IR), Scanning electron microscope(SEM) and N₂ adsorption-desorption isotherm, the adsorption of formaldehyde on to polyaniline/TiO₂ may be through a chemical adsorption, in which the amine and imine groups in the polyaniline chain play important roles in the interaction between polyaniline/TiO₂ composite and formaldehyde, and the formaldehyde may form as doping groups doped onto the polyaniline/TiO₂. This contributes to the advanced adsorption affinity and capacity of polyaniline towards the formaldehyde even in a trace initial concentration, outperforming the commercially available activated carbon and glass beads very much. These novel properties allow polyaniline/TiO₂ to be applied as an advanced formaldehyde scavenger in next generation to protect human being from the danger of formaldehyde, challenging present commercially available formaldehyde adsorbents greatly.

甲醛是一种常见的室内环境污染物，对人体危害很大。在这项研究中，研究了一种新型的聚苯胺/ TiO ₂（PANI / TiO ₂）在室温下与空气中的甲醛相比，与活性炭和玻璃珠的吸附行为，并详细解释了其机理。聚苯胺/ TiO ₂表现出对从朗缪尔方程式获得的甲醛的0.67 mg g ^-1的增强吸附能力，这高于0.50 mg g ^-1的市售活性炭。而聚苯胺/ TiO ₂通过使用简单的酸碱处理也可以稳定地回收利用。此外，通过动力学研究获得了聚苯胺/ TiO ₂ >活性炭>玻璃珠的初始吸附速率顺序，证实了我们的聚苯胺/ TiO ₂的甲醛去除优势。通过吸附等温线研究和X射线光电子能谱（XPS），傅立叶变换红外光谱（FT-IR），扫描电子显微镜（SEM）和N ₂吸附-解吸等温线，甲醛在聚苯胺上的吸附等各种表征实验得到证实/ TiO ₂可能是通过化学吸附作用，其中聚苯胺链中的胺和亚胺基在聚苯胺/ TiO之间的相互作用中起重要作用₂复合物和甲醛，并且甲醛可以作为掺杂在聚苯胺/ TiO ₂上的掺杂基团形成。即使在极低的初始浓度下，这也有助于提高聚苯胺对甲醛的吸附亲和力和容量，大大优于市售的活性炭和玻璃珠。这些新颖的特性使得聚苯胺/ TiO ₂可以在下一代中用作高级甲醛清除剂，以保护人类免受甲醛的危害，极大地挑战了目前市售的甲醛吸附剂。