National Engineering Research Center of Chemical Fertilizer Catalyst, School of Chemical Engineering, Fuzhou University, Fuzhou 350002, Fujian, PR China.
National Engineering Research Center of Chemical Fertilizer Catalyst, School of Chemical Engineering, Fuzhou University, Fuzhou 350002, Fujian, PR China.
J Hazard Mater. 2018 May 15;350:38-45. doi: 10.1016/j.jhazmat.2018.01.057. Epub 2018 Feb 1.
Sawdust was expected to remove impurities in waste lubricant, and was modified with sodium hydroxide and triethanolamine, which can ameliorate its surface properties and improve its adsorption capacity. The increase of hydroxyl groups, the decrease of carbonyl groups and grafting new azyl after modification were beneficial for the adsorption of impurities. The surface area of modified sawdust is 0.969 m g, which is nearly 1.39 times as much as raw sawdust. The point of zero charge for modified sawdust decreased from 6.75 to 5.68 while the crystallinity of modified sawdust increased from 40.35 to 56.16. This research discovered that compared with raw sawdust and filter paper, modified sawdust possessed superior adsorption performances. The removal percentages for Si, Al, Fe, Cu was enhanced from 2.54%, 20.34%, 16.55%, 0.26% to 15.37%, 21.99%, 45.37%, 4.88%, respectively, while that for oxidation, aromatics, sulphation, soot and water was improved by 4.33, 4.69, 0.76, 1.20, 1.28 times at 80 °C with 1000 rpm for 12 h. The research has also explored the optimum adsorption conditions (adsorption temperature, adsorption time and rotation rate). The modified sawdust showed a stable adsorption capacity for impurities under different adsorption conditions.
木屑有望去除废润滑油中的杂质，并经过氢氧化钠和三乙醇胺改性，可以改善其表面性能并提高其吸附能力。改性后羟基数量的增加、羰基数量的减少以及新的氮杂环的接枝有利于杂质的吸附。改性木屑的比表面积为 0.969 m²/g，几乎是原木屑的 1.39 倍。改性木屑的等电点从 6.75 降低到 5.68，而结晶度从 40.35 增加到 56.16。这项研究发现，与原木屑和滤纸相比，改性木屑具有更优异的吸附性能。Si、Al、Fe、Cu 的去除率分别从 2.54%、20.34%、16.55%、0.26%提高到 15.37%、21.99%、45.37%、4.88%，而氧化、芳烃、硫酸盐、烟尘和水的去除率分别提高了 4.33、4.69、0.76、1.20、1.28 倍，在 80°C 下以 1000rpm 旋转 12 小时。该研究还探索了最佳吸附条件（吸附温度、吸附时间和转速）。在不同的吸附条件下，改性木屑对杂质表现出稳定的吸附能力。
