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随着世界性的野生动植物保护运动的开展,犹如皮革、象牙等产品面临原料枯竭的危机,因而,相应的人造制品已开始开发研制。本文介绍有关人造制品的开发动向。1 人造皮革通过电子显微镜观察可知,天然的鹿皮皮革是由长度为280hm,直径1.5nm的胶原蛋白纤维络合而成的复杂的三维结构。日本东丽公司曾于1968年研制成 相似文献
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Lanthanum alginate bead is a new, highly active adsorbent. In the present study, we investigated its ad- sorption performance and its adsorption mechanism. The adsorption isotherm for fluoride onto lanthanum alginate b ead fits the Langmuir model well, and the maximum adsorption capacity is 197.2 mg·g-1. X-ray diffraction shows the amorphous nature of lanthanum alginate bead, which allows for better accessibility to fluoride and thus better activity. Infrared spectra of lanthanum alginate bead before and after adsorption confirm its stable skeletal structure. Scanning electron microscopy shows that the dense surface structure of the adsorbent appear cracks after adsorption. T he adsorption mechanism of lanthanum alginate bead is considered as an ion exchange between F- and Cl- or OH-, as verified from the adsorbent and the solution by pH effect, energy dispersive X-ray, and ion chromatography. 相似文献
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