Since there are polyhydroxyl groups on the outer side of the molecular cavity of cyclodextrin, and there are only hydrogen atoms covering the solitary electron on the glycoside oxygen atom on the inner surface of the cyclodextrin molecular cavity, the entire cyclodextrin molecule has a lipophilic inside cavity and an outside cavity. Hydrophilic amphiphilic properties (see figure for the structure of hydroxypropyl beta cyclodextrin), and its hydrophobic cavity can combine with many organic substances to form host-guest inclusion compounds. This feature is that they have a structural basis for wide application in the fields of pharmacy, food, electrochemistry, etc., and have important research and promotion significance for soil management.
Hazardous substances in the soil are widely distributed in the environment such as polycyclic aromatic hydrocarbons (polycyclic aromatic hydrocarbons) and phenols, and these hazardous substances are listed as important environmental monitoring items. Most organic pollutants are weakly polar, have low solubility, and are easily adsorbed by soil organic colloids. The removal of these pollutants and increasing their solubility are usually the first and crucial step. Utilizing the influence of hydroxypropyl beta-cyclodextrin on the transport behavior of weakly polar organic pollutants in the soil, the inclusion compound is formed through inclusion, which increases the presence of trichloroethylene, naphthalene, biphenyl, 2-chlorobiphenyl, 3-The transport of organic pollutants such as chlorobiphenyl, anthracene, and pyrene in the soil reduces the volatility of organic compounds and increases their solubility, and this positive promotion effect will increase with the increase of HPCD concentration.
Due to the burning of fossil fuels, industrial sewage and the widespread use of pesticides, organic pollutants such as phthalates, polycyclic aromatic hydrocarbons, organochlorines and organophosphorus pesticides enter the soil environment directly or indirectly, and are easily affected by the soil due to their fat solubility. The particles are adsorbed and remain in the soil for a long time. Many of these organic substances are carcinogenic, teratogenic or mutagenic. Remaining in the soil can not only reduce crop yields or even eliminate crops, but also enter the food chain through plants or animals, which will have a serious impact on human survival and health. Therefore, soil restoration research and treatment technologies for organic pollutants are still hotspots and difficulties in environmental protection.
