将WEP(水性环氧树脂)胶粘剂与铁红颜料、石英砂及固化剂等混合均匀、干燥后,制得人造有机彩砂。采用不同浓度和类型的分散剂[如聚乙二醇(PEG)、十六烷基三甲基溴化铵(CTMAB)和油酸钠(SO)等]对颜料进行改性,以提高人造有机彩砂的耐搅拌性能。研究结果表明:当SO浓度为1.5 mmol/L时,颜料表面的Zeta电位绝对值(49.0 m V)相对最大、静电排斥作用相对最强且颜料的分散稳定性相对最佳;此时,该有机彩砂表面颜料颗粒的团聚体减小且分散均匀,其在搅拌后的颜色较为鲜艳,应用性能得到提高。
N-K2Ti4O9/UiO-66-NH2 composites synthesized by a facile solvothermal method have a core-shell structure with UiO-66-NH2 forming the shell around a N-K2Ti4O9 core.Their photocatalytic activities in the degradation of dyes under visible light irradiation were investigated.The N-K2Ti4O9/UiO-66-NH2 composites exhibited higher photocatalytic activity than the pure components.This synergistic effect was due to the high adsorption capacity of UiO-66-NH2 and that the two components together induced an enhanced separation efficiency of photogenerated electron-hole pairs.The mass ratio of N-K2Ti4O9 to ZrCl4 of 3：7 in the composite exhibited the highest photocatalytic activity.Due to the electrostatic attraction between the negatively charged backbone of UiO-66-NH2with the positively charged groups of cationic dyes,the composites were more photocatalytically active for cationic dyes than for anionic dyes.
