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Efficient and ecological leather processing: replacement of lime and sulphide with dispase assisted by 1-allyl-3-methylimidazolium chloride

查看全文 作　　者：Hui [1,2]Liu;Keyong [1]Tang;Xiumin [1]Li;Jie [1]Liu;Xuejing [1]Zheng;Ying [1]Pei 高影响力作者 机构地区：[1]School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,People’s Republic of China;[2]Department of Packaging Engineering,Henan University of Science and Technology,Luoyang 471023,People’s Republic of China.高影响力机构 出　　处：《Journal of Leather Science and Engineering》索引2022年第4卷第1期,共13页高影响力期刊 基　　金：National Natural Science Foundation of China(No.51673177);National Key R&D Program of China(No.2017YFB0308500). 摘　　要：Leather is a collagen-based biomass prepared from raw skins or hides by a series of unit operations, in which the unhairing and fiber opening are extremely important operations. However, the conventional Na2S/Ca(OH)2 system used in unhairing and fiber opening has given rise to the pollution to the environment. It is necessary to develop substitute technology for the Na2S/Ca(OH)2. In the present study, 1-allyl-3-methylimidazolium chloride ([AMIm]Cl) was used to cooperate with dispase for cycle unhairing and one-pot beamhouse to recycle waste bovine hides and com-pared with conventional processing. During those processes, the mechanism of [AMIm]Cl-dispase synergistic unhair-ing and collagen fibers opening were studied. Besides, plant hazard, organic matter and [AMIm]Cl of wastewater from [AMIm]Cl-dispase process were respectively investigated and separated to evaluate the environmental and economic benefits of the [AMIm]Cl-dispase process. As a result, enzyme activity after unhairing by [AMIm]Cl-diapase system for using 5 times is higher than that by KCl-dispase system, and needs lower unhairing time, which is because of rapid penetration of [AMIm]Cl-dispase solution in bovine hides. For this reason, the tensile strength and elastic modulus of tanned leather from [AMIm]Cl-dispase process are higher than those from the KCl-diapase and conventional pro-cesses, and its hydrothermal shrinkage temperature is comparable to that of the conventional one. Because of the 58.13% lower wastewater discharge (WD), 66.60% lower total solids (TS), 97.23% lower ammonia nitrogen (NH3-N), non-toxic wastewater and organic matter recovery in wastewater are reached from [AMIm]Cl-dispase process, which is expected to be an alternative to the conventional process to reduce environmental pollution and realize the sustainable development of technology for leather manufacturing. 关 键 词：1-Allyl-3-methylimidazolium chloride DISPASE Bovine hides Leather making Recycling Bioresource
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