文档介绍：燥 10h。制得材料面密度增加 40%,厚度变化不明显,MD 方向、
CD 方向强力分别提高 %和 %,同时断裂伸长率分别下降 %和 %,固化单宁前后鞣革胶原纤维水刺材料耐酸性均强于耐碱性,碱性条件水解后形成凝胶状多肽链。
在相同的初始浓度、溶液温度、溶液 pH 值实验条件下,单宁固化鞣革胶原水刺材料对 Cu2+、Pb2+重金属离子吸附能力优于未处理的废鞣革胶原水刺材料;随着重金属初始浓度、溶液温度、溶液 pH 值的增加,固化单宁前后鞣革胶原纤维水刺材料对重金属的吸附量均增加;通过吸附动力学分析,准一级动力学方程拟合较差,准二级动力方程拟合效果较好。吸附等温线分析,Freundlich 方程和 Langmuir 方程均能较好拟合单宁固化废鞣革胶原水刺材料的重金属吸附规律,固化单宁后鞣革胶原水刺材料重金属吸附能力得到提高。利用稀 HCl 溶液解吸附后,发现重金属吸附物一部分形成稳定的络合物,一部分形成非稳定的络合物,吸附量及解吸附量不断衰减, 超过两次循环后重复再生性不理想。
关键词:鞣革胶原纤维;水刺;非织造材料;单宁;重金属吸附
II
ADSORPTION CAPACITY OF HEAVY METALS BY SPUNLACED NONWOVEN MATERIAL MADE OF COLLAGEN FIBERS
ABSTRACT
China is a big country of manufacturing leather products, however, the waste leather results in serious waste of resources. How to make rational use of the waste leather and turn waste into treasure has e an important factor in the sustainable development of our economy. In order to expand the application of the waste leather, we treat the waste collagen fiber as research objection to study how the wet-heat condition affects the structure and elongation properties. We produce the waste collagen fiber into collagen spun-lace nonwoven material through the procedure of air-laid and water jet process. Then spun-lace material is immobilized by tannin through the cross-link of glutaraldehyde which can absorb the heavy metal waste water. We study the adsorption and desorption properties of the material to provide new ideas for the waste collagen fiber application.
We analyze the fiber’s resistance property to wet-heat and find the sensitive temperature is ℃ through the TG, DSC, FTIR and XRD. Therefore in the following process, the temperature can’t be higher than ℃. Otherwise the protein molecules three-ply helix
chain structure of the collagen will be damaged resulting in bad strength and elongation performance.
We obtain the optimal processing parameters through orthogonal design: the spun-lace material is immersed in 60g/L tannin(aq) solution under 40℃ for 8h, then th