You Yaohui, Zhang Jiayong, Sun Xubing
Key Laboratory of Fruit Waste Treatment and Resource Recycling of the Sichuan Provincial Higher Learning Institutes Neijiang Sichuan Province 641100 China
RSC Adv. 2019 May 24;9(28):16271-16277. doi: 10.1039/c9ra02407g. eCollection 2019 May 20.
In this study, a novel biomass composite retention aid was developed by using collagen hydrolysate (CH) extracted from collagen waste as the starting material, glutaraldehyde as the organic crosslinking agent and polymeric aluminum chloride (PAC) as the inorganic modifying agent. The as-prepared retention aids were characterized by gel chromatography, hydrodynamic diameter, zeta potential, transmission electron microscope (TEM), ultraviolet-visible adsorption spectra (UV-Vis), Fourier infrared spectrometer (FT-IR), and X-ray photoelectron spectroscopy (XPS). The results indicated that glutaraldehyde increased the molecular size of CH (, CCH) through the crosslinking reaction between the aldehyde group of glutaraldehyde and the primary amine group of CH. Subsequently, the PAC further increased cationic charge density and molecular size of CCH (, PAC-CCH) by the coordination interaction and self-assembly, thereby endowing PAC-CCH with better charge neutralization and bridging flocculation abilities. Compared to CH, CCH and PAC, the PAC-CCH exhibited excellent retention and drainage performances, and the best retention rate was greater than 85% at the dosage of 0.6 wt%. Our experimental results suggest that collagen wastes have a great potential to produce novel high-performance retention aids.
在本研究中，以从胶原废料中提取的胶原水解物（CH）为起始原料，戊二醛为有机交联剂，聚合氯化铝（PAC）为无机改性剂，开发了一种新型生物质复合助留剂。通过凝胶色谱、流体动力学直径、zeta电位、透射电子显微镜（TEM）、紫外可见吸收光谱（UV-Vis）、傅里叶红外光谱仪（FT-IR）和X射线光电子能谱（XPS）对所制备的助留剂进行了表征。结果表明，戊二醛通过其醛基与CH的伯胺基之间的交联反应增加了CH（CCH）的分子尺寸。随后，PAC通过配位相互作用和自组装进一步提高了CCH（PAC-CCH）的阳离子电荷密度和分子尺寸，从而赋予PAC-CCH更好的电荷中和及架桥絮凝能力。与CH、CCH和PAC相比，PAC-CCH表现出优异的助留和助滤性能，在用量为0.6 wt%时，最佳助留率大于85%。我们的实验结果表明，胶原废料在生产新型高性能助留剂方面具有巨大潜力。
