Abstract
Advanced modified polyacrylonitrile (PAN) membrane with high adsorption property for heavy metal ions was designed and fabricated for the first time. The introduced diazoresin-ethylenediaminetetraacetic acid (DR-EDTA) layer could effectively absorb the metal ion, such as Cu2+, Pb2+, Hg2+ in the waste water. The effects of layers, metal ion concentration, pH, temperature and cycle time were investigated. The results showed that the adsorption isotherms for Cu2+ were well fitted by Langmuir model. The maximum adsorption capacity of the modified membrane for Cu2+ was approximately 47.6 mg/g. In addition, the prepared PAN-(DR-EDTA)3 membrane could be regenerated more than 720 h based on their adsorption/desorption cycles. The results demonstrated that the modified PAN membrane could be used as effective adsorbents for heavy metal removal from waste water.
Highlights
The PAN fiber membranes have been applied in many aspects, such as microfiltration[18], ultrafiltration[19,20,21], desalination[22,23,24]
The surface modification of PAN fiber with diazoresinethylenediaminetetraacetic acid (DR-EDTA) layers were successfully performed by method of layer-by-layer self-assembly method
This indicated that not all the –CN groups participate in the hydrolysis, which implied modification mainly occurred on surface of PAN fiber membrane
Summary
The PAN fiber membranes have been applied in many aspects, such as microfiltration[18], ultrafiltration[19,20,21], desalination[22,23,24]. The pure PAN fiber membrane could not absorb metal ions effectively, which restricted their further application in water treatment. To address this challenge, many attempts were performed on the surface modification of pure PAN membrane. The preparation processes of membranes were complicated and costly. The metal ions to some degree, enhanced adsorption capacity of the membrane was limited as for the number of grafted functional absorb groups in the polymer chain. The modified PAN membrane could absorb different heavy metal ions selectively. The adsorption performance of the as-prepared membrane, including the modification layer number effect, temperature effect, recycling properties as well as the water flux were thoroughly investigated
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