pH对胶束强化超滤法处理废水中重金属形态及去除的影响
Influence of pH on heavy metal speciation and removal from wastewater using micellar-enhanced ultrafiltration.
作者信息
Huang Jinhui, Yuan Fang, Zeng Guangming, Li Xue, Gu Yanling, Shi Lixiu, Liu Wenchu, Shi Yahui
机构信息
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, China.
出版信息
Chemosphere. 2017 Apr;173:199-206. doi: 10.1016/j.chemosphere.2016.12.137. Epub 2016 Dec 28.
pH plays an important role in heavy metal removal during micellar-enhanced ultrafiltration (MEUF). In the present work, the influence of pH on heavy metal speciation and removal from wastewater by MEUF was investigated using an anionic surfactant (sodium dodecyl sulfate, SDS) and a hydrophilic membrane (polyether sulfone). Experiments were performed with pH values in the range of 1-12. Metal ion removal efficiency (R) was used to assess the effects of the MEUF process. Results showed that better removal rate of copper and cadmium was achieved at high pH values (pH > 3) with SDS feed concentration of 8 mM, while the optimal pH range was 3-10 for zinc and lead. The corresponding efficiencies for heavy metal removal decreased with the increasing feed concentration of metal ions under the pH conditions of 1-12. Furthermore, the heavy metal ion removal rate (50 mg/L) followed the order of Pb > Cd > Zn > Cu. These results showed that pH is a key parameter in metal ion speciation and removal during MEUF.
在胶束强化超滤（MEUF）过程中，pH值对重金属去除起着重要作用。在本研究中，使用阴离子表面活性剂（十二烷基硫酸钠，SDS）和亲水膜（聚醚砜）研究了pH值对MEUF去除废水中重金属形态及去除效果的影响。实验在pH值为1 - 12的范围内进行。采用金属离子去除效率（R）来评估MEUF过程的效果。结果表明，在SDS进料浓度为8 mM时，高pH值（pH > 3）下铜和镉的去除率更高，而锌和铅的最佳pH范围为3 - 10。在1 - 12的pH条件下，随着金属离子进料浓度的增加，相应的重金属去除效率降低。此外，重金属离子去除率（50 mg/L）的顺序为Pb > Cd > Zn > Cu。这些结果表明，pH值是MEUF过程中金属离子形态和去除的关键参数。
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