School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui, 243002, China; Engineering Research Center of Biomembrane Water Purification and Utilization Technology, Ministry of Education, Maanshan, Anhui, 243002, China.
School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan, Anhui, 243002, China; Engineering Research Center of Biomembrane Water Purification and Utilization Technology, Ministry of Education, Maanshan, Anhui, 243002, China.
J Hazard Mater. 2021 Feb 5;403:123690. doi: 10.1016/j.jhazmat.2020.123690. Epub 2020 Aug 15.
In this work, modified chitosan flocculants (MCS) was synthesized by using chitosan (CS), acrylamide, cationic monomers and hydrophobic monomers via low-pressure UV-initiated copolymerization. The flocculation performance of MCS was evaluated in emulsified oily wastewater treatment. The effect of cationic and hydrophobic structure on oil removal was studied, and the interactions between these functional groups and the components in oil were also analyzed. Results suggested that MCS flocculants exhibited excellent oil removal efficiency in a wide pH range (2.0‒10). The flocculation efficiency of 91 % was achieved at the dosages of 0.6 mL/L (6 mg/L). During pH of 2.0-10, the optimal cationic and hydrophobic monomer was DMC and VT, respectively. Silane groups were favorable for oil removal than the other hydrophobic structures. The cationic groups expanded the optimal pH range of MCS in flocculation, whereas hydrophobic groups considerably reduced the dosage of MCS. The experimental results showed that alkane, cyclic aromatic hydrocarbon compounds in oil can be easily removed by using MC4, whereas cycloalkanes compounds was effectively removed by MC6 and MC7 because of preferable demulsification capacity, and the hydrophobic interaction, interfacial adsorption and electrostatic attraction played the dominant in flocculation. Thus, the synthesized MCS is favorable for emulsified oily wastewater treatment.
在这项工作中，通过低压紫外引发共聚，用壳聚糖（CS）、丙烯酰胺、阳离子单体和疏水性单体合成了改性壳聚糖絮凝剂（MCS）。评价了 MCS 在乳化含油废水中的絮凝性能。研究了阳离子和疏水性结构对除油效果的影响，并分析了这些官能团与油中成分之间的相互作用。结果表明，MCS 絮凝剂在较宽的 pH 值范围（2.0-10）内表现出优异的除油效率。在剂量为 0.6 mL/L（6 mg/L）时，絮凝效率达到 91%。在 pH 值为 2.0-10 时，最佳的阳离子和疏水性单体分别为 DMC 和 VT。硅烷基团比其他疏水性结构更有利于除油。阳离子基团扩展了 MCS 在絮凝中的最佳 pH 值范围，而疏水性基团则大大降低了 MCS 的用量。实验结果表明，MC4 可轻易去除油中的烷烃、环状芳烃化合物，而 MC6 和 MC7 则因具有较好的破乳能力，有效地去除了环烷烃化合物，其中疏水性相互作用、界面吸附和静电吸引在絮凝中起主要作用。因此，合成的 MCS 有利于处理乳化含油废水。
