硅藻质蛋白石对室内空气污染的典型有机分子的吸附—气态水分子的影响和机制

Diatom mud is a kind of interior wall coating material based on diatomite, of which the main component is diatomaceous opal-A. It is widely used for indoor decoration, and its adsorption property for indoor air pollution, especially gaseous organic pollutants, is widely publicized. However, from the point of view of mineral structure and interfacial reaction, the adsorption performance of organic molecules on diatom mud (or diatomite) has not been accurately evaluated. This is mainly due to: (I) the competitive adsorption of coexisted gaseous water molecules with organic molecules has not been taken into consideration. (II) the stability of organic molecules adsorbed by diatomaceous opal-A has not been studied. The above-mentioned problems directly affect the safety or applicability of the related diatomite products. Therefore, typical diatomaceous opal-A samples were selected, and the mechanism of interfacial adsorption reaction between diatomaceous opal-A and typical indoor organic molecule was in-depth explorated starting from the analysis of the pore structure and surface hydroxyl groups. The research focus on the competitive adsorption of water molecules and the stability of adsorbed organic molecules to investigate the effect and mechanism of the structure and property of diatomaceous opal-A and the species difference on the adsorption of organic molecules. The results will hopefully improve the cognition level of the structure and properties of diatomaceous opal-A , even its adsorption performance for organic molecules, and provide basic data and valuable theoretical and experimental basis for the use of diatomite for organic molecules adsorption.

“硅藻泥”是基于硅藻土（以硅藻蛋白石为主要成分）的内墙涂料，广泛用于室内装修；其对室内空气污染（尤其是气态有机污染物）的吸附功能被广为宣传。然而，从矿物结构和界面反应的角度看，硅藻泥（或硅藻土）对有机分子的吸附性并未被准确评估。这主要在于：（i）未考虑共存气态水分子对有机分子的竞争吸附问题;(ii)未研究有机分子被硅藻蛋白石吸附后的吸附稳定性问题。这直接影响到相关硅藻土产品的使用安全性或适用性。为此，本研究选取典型硅藻蛋白石样品，从其孔结构和表面羟基性质分析入手，深入探索其对典型室内有机分子的界面吸附反应机理，重点研究水分子的竞争吸附问题和吸附后有机分子的稳定性问题，以探明硅藻蛋白石结构-性质及其种属差异性对其有机分子吸附性的影响机制。研究结果将可望提高对硅藻蛋白石结构和性质乃至其有机分子吸附性的认知水平，为硅藻土用于有机物吸附等用途提供基础性数据和有价值的理论和实验依据。

“硅藻泥”是基于硅藻土（以硅藻蛋白石为主要成分）的内墙涂料，广泛用于室内装修；其对室内空气污染（尤其是气态有机污染物）的吸附功能被广为宣传。然而，从矿物结构和界面反应的角度看，硅藻泥（或硅藻土）对有机分子的吸附性并未被准确评估。这主要在于：（i）未考虑共存气态水分子对有机分子的竞争吸附问题;(ii)未研究有机分子被硅藻蛋白石吸附后的吸附稳定性问题。这直接影响到相关硅藻土产品的使用安全性或适用性。为此，本研究选取典型硅藻蛋白石样品，从其孔结构和表面羟基性质分析入手，深入探索其对典型室内有机分子的界面吸附反应机理，重点研究水分子的竞争吸附问题和吸附后有机分子的稳定性问题，以探明硅藻蛋白石结构-性质及其种属差异性对其有机分子吸附性的影响机制。研究结果将可望提高对硅藻蛋白石结构和性质乃至其有机分子吸附性的认知水平，为硅藻土用于有机物吸附等用途提供基础性数据和有价值的理论和实验依据。