No abstract

Lanonol phosphate was synthesized by a sustained-release phosphorylation reaction method using P 2 O 5 dispersed in lanonol phosphate. The phosphorylation reaction studies confirmed the best condition was a reaction temperature of 75°C, a reaction time of 2.5 h and a molar ratio of hydroxyl and P 2 O 5 of 3.0:1.0. The mole fraction of monoalkyl phosphate made by the sustained-release method increased by 14.3% compared to that obtained by the direct addition of P 2 O 5 . Preparation of lanonol phosphates by this method overcomes the agglomeration problem of phosphorus pentoxide, and the reaction rate is steady. Since lanonol phosphate was used as the dispersant for P 2 O 5 powder, impurities due to the presence of other dispersants were eliminated, allowing synthesis of a nearly pure product. A mixture of monoalkyl phosphate and dialkyl phosphate with high monoalkyl content is obtained with light color. It is an eco-friendly reaction with minimal waste.

Collagen is a typical amphiphilic natural macromolecule with amino-and carboxylic-end groups and many acidic or alkaline branches. The hydrolysis of collagen will release many hydrophilic functional groups including carboxyl, hydroxyl, amino, etc. These functional groups, especially amino group, can react with formaldehyde so that collagen-derived polypeptide can be used as natural formaldehyde scavenger. In this study, the collagen-derived polypeptide was extracted from organic phosphonium-tanned leather shavings by using magnesium oxide and alkaline protease with extraction rate as high as 90.4%. To increase the functional groups that reacted with formaldehyde, the extracted collagen-derived polypeptide was modified by diethylene triamine; characterization by FTIR, GPC, and 1 H NMR suggested that the content of amino group increased. Moreover, the amount of formaldehyde removed by the modified collagen-derived polypeptide, i.e., the aminated collagen-derived polypeptide, was significantly increased to 94.7% comparing with that by using collagen-derived polypeptide with the dosage of 70 mL/m 3 , respectively. Therefore, modifying the hydrolysate obtained from the leather shavings and using as the formaldehyde scavenger has a good potential in achieving the benign treatment and reuse of the solid leather wastes.