Novel way of transformation of tannery waste to environmentally friendly formaldehyde scavenger

Abstract

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.

Application of Compound Formaldehyde Scavenger in Leather

“…Self-prepared formaldehyde scavenger such as EAC and HPAM were used to remove free formaldehyde in aldehyde tanned leather, and compared with other formaldehyde scavengers. The measurement method of the formaldehyde content in leather referred to literature [9]. The process was as Table 1.…”

Introducing Polyhydroxyurethane Hydrogels and Coatings for Formaldehyde Capture

“…Several methods to decrease FA concentration in indoor air emerged recently to tackle these objectives. The first solution consists of reducing the FA emission from high formaldehyde-containing resins by the addition in the resin formulation of FA scavengers like amines, , tannin, − urea, , Al 2 O 3 nanoparticles, or sodium metabisulfite . However, such changes may impart a strong modification of the resin properties or affect the application process. , Other solutions consist of eliminating FA after its emission.…”

Antioxidant cuttlefish collagen hydrolysate against ethyl carbamate-induced oxidative damage

“…17 Collagen hydrolysate is rich in a variety of hydrophilic amino acids and hydrophobic amino acids, which give collagen hydrolysate unique amphiphilic structure. 18 Unlike polyphenols, collagen hydrolysate that have drawn dramatic attention of researchers is more stable in application due to its special sequence and amphiphilic structure. 19,20 The collagen hydrolysate has been widely applied in the food industry due to its high emulsication stability.…”