乳状液膜分离富集废水中的苯酚

以聚异丁二烯双丁酰亚胺(T-154)为表面活性剂制备乳状液膜,研究其对废水中苯酚的分离富集效果。通过单因素法和正交实验优选了乳状液膜的制备条件,即:V(T-154)∶V(液体石蜡)∶V(煤油)=4∶2∶30,质量分数3%的Na OH溶液为内水相,油内比为1∶2(体积比);将最优条件下制备的乳状液膜用于对废水中苯酚的分离富集条件为:溶液p H=6,乳水比为1∶4(体积比),富集时间为15 min;在该条件下加标回收率为96%~98%,相对标准偏差RSD(n=6)为3.7%~4.8%。

Separation and Preconcentration Phenol in Waster Water by Emulsion Liquid Membrane System

Emulsion liquid membrane system containing mobile carrier is widely applied in separation and preconcentration of trace substances in wastewater. The polyamine surfactants such as polyisobutylene-bis-succinimide (T-154) have attracted considerable interest due to good emulsifying and dispersing properties. In the paper, the surfactant was used as double effects of emulsifier and mobile carrier in the emulsion liquid system for the first time. The enrichment performance for phenol was investigated by the emulsion liquid membrane. Established stable conditions of the emulsion liquid membrane are as follows: the volume ratio of T-154 to liquid paraffin to kerosene is 4:2:30, the mass concentration of sodium hydroxide (NaOH) solution used as the internal phase is 3%, the ratio of oil phase to internal phase is 1:2. The separation conditions involved the pH value of feed phase (pH=6), the ratio of emulsion to external phase (1:4), and enrichment time (15min) were founded. The phenol in the wastewater was separated and enriched with the prepared emulsion. The satisfactory results show that the recovery of standard addition is between 96% and 98%, the relative standard deviation is between 3.7% and 4.8%. The established method has the advantages of simple operation, low capital and operating costs and high efficiency, which can be used to remove phenol from aqueous media such as wastewater.