改性氧化石墨烯膜处理印染废水的能力与机理

Ability and mechanism of modified graphene oxide membrane to treat printing and dyeing wastewater

摘要:

利用改性氧化石墨烯膜处理高色度、高毒性工业染料废水。使用硫脲（TU）对氧化石墨烯（GO）进行交联，以m(TU):m(GO)=0.5，反应温度80 °C，反应时间1 h的TU-GO纳米片为原料，在聚醚砜微滤膜（0.22 μm）上沉积，当负载量为238.73 mg/m2时，对甲基橙、罗丹明B、亚甲基蓝的截留率为94.01%、87.07%和99.67%；为优化对罗丹明B的分离效果，使用硫脲（TU）和氯化胆碱（ChCl）组成低共熔溶剂(DES)制备改性氧化石墨烯膜：m(TU):m(ChCl)=2:1，改性时间1 h。改性氧化石墨烯膜未对甲基橙、亚甲基蓝原有的高截留率造成影响，截留率分别为93.95%，99.24%；对罗丹明B截留率提升至99.16%。另对TU交联过程中对GO的还原机理和增稳机理做出分析。

Abstract:

Treatment of industrial dye wastewater with high chromaticity and high toxicity by modified graphene oxide membrane. The graphene oxide (GO) was crosslinked using thiourea (TU). TU-GO nanosheets with m(TU):m(GO)=0.5, reaction temperature 80 °C, reaction time 1h were deposited on polyether sulfone microfiltration membrane (0.22 μm). When the loading capacity was 238.73 mg/m2, the polyether sulfone microfiltration membrane was deposited. The retention rates of methyl orange, Rhodamine B and methylene blue were 94.01%, 87.07% and 99.67%. In order to optimize the separation effect of Rhodamine B, the modified graphene oxide film was prepared by using thiourea (TU) and choline chloride (ChCl) as a eutectic solvent :m(TU):m(ChCl)=2:1, and the modification time was 1 h. The modified graphene oxide film did not affect the original high retention rates of methyl orange and methylene blue, which were 93.95% and 99.24%, respectively. The retention rate of P-Rhodamine B was increased to 99.16%. The reduction mechanism and stability enhancement mechanism of GO during thiourea crosslinking were also analyzed.