基于鞣制废革屑的生物基皮革填料的制备及性能

采用双氧水对非铬金属鞣制废革屑进行了催化氧化,制得降解产物(DCH),然后采用双醛海藻酸钠(DSA)对DCH进行改性,获得生物基皮革填料(BDH)。采用FTIR、GPC、XPS和Zeta电位分析仪对DCH和BDH的结构和性质进行了表征。结果表明,DSA对DCH成功进行了改性,BDH的重均相对分子质量可由DCH的3900提升至5570,同时其等电点由5.2调控至3.3。填充实验表明,相较于未添加蛋白填料的革坯,DCH和BDH填充革坯的各项性能明显更优,特别是抗张强度和丰满性;与DCH填充革坯相比,BDH填充革坯的抗张强度由11.5 N/mm^(2)提升至22.9 N/mm^(2),撕裂强度由58.1 N/mm提升至80.9 N/mm,柔软度由7.2 mm提升至7.9 mm,丰满性也得到提升,整体性能优于常用商品蛋白填料。

Degradation kinetics and mechanisms of phenolin photo－Fenton process

Phenol degradation in photochemically enhanced Fenton process was investigated in this work. UV-VIS spectra of phenol degradation showed the difference between photo-Fenton process and UV/H2O2, which is a typical hydroxyl radical process. A possible pathway diagram for phenol degradation in photo-Fenton process was proposed, and a mathematical model for chemical oxygen demand (COD) removal was developed. Operating parameters such as dosage of H2O2 and ferrous ions, pH, suitable carrier gas were found to impact the removal of COD significantly. The results and analysis of kinetic parameters calculated from the kinetic model showed that complex degradation of phenol was the main pathway for removal of COD: while hydroxyl radicals acted weakly in the photo-Fenton degradation of phenol.