Removal of Heavy Metals from Wastewater Using Novel Polydopamine-Modified CNTs-Based Composite Membranes

The presence of major heavy metals including Pb2+, Cu2+, Co2+, Ni2+, Hg2+, Cr6+, Cd2+, and Zn2+ in water is of great concern because they cannot degrade or be destroyed. They are toxic even at very low concentrations. Therefore, it is necessary to remove such toxicants from water. In the current stu...

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Bibliographic Details
Published in:Processes 2021-12, Vol.9 (12), p.2120
Main Authors: Altaf, Faizah, Ahmed, Shakeel, Usman, Muhammad, Batool, Tahira, Shamshad, Jaweria, Bocchetta, Patrizia, Batool, Rida
Format: Article
Language:English
Subjects:
Adsorption
Cadmium
Carbon
Carbon dioxide
Carbon nanotubes
Cobalt
Copper
Dopamine
Graphene
Heavy metals
Lead
Low concentrations
Membranes
Nanocomposites
Nanomaterials
Nanoparticles
Nanotubes
Pollutants
Polymers
Polysulfone
Polysulfone resins
Surfactants
Toxicants
Wastewater
Wastewater treatment
Zinc
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Summary:The presence of major heavy metals including Pb2+, Cu2+, Co2+, Ni2+, Hg2+, Cr6+, Cd2+, and Zn2+ in water is of great concern because they cannot degrade or be destroyed. They are toxic even at very low concentrations. Therefore, it is necessary to remove such toxicants from water. In the current study, polydopamine carbon nanotubes (PD-CNTs) and polysulfone (PS) composite membranes were prepared. The structural and morphological features of the prepared PDCN composite membranes were studied using FTIR, XRD, SEM, and EDS. The potential application of PDCNs for heavy metal removal was studied for the removal of Pb2+, Cr6+, and Cd2+ from wastewater. The maximum removal efficiency of 96.1% was obtained for Cr6+ at 2.6 pH using a composite membrane containing 1.0% PD-CNTs. The removal efficiencies decreased by 64.1 and 73.4, respectively, by enhancing the pressure from 0.50 up to 0.85 MPa. Under the same circumstances, the percentages of Pb+2 removal at 0.49 bar by the PDCNS membranes containing 0.5% and 1.0% PD-CNT were 70 and 90.3, respectively, and decreased to 54.3 and 57.0, respectively, upon increasing the pressure to 0.85 MPa. The results showed that PDCNS membranes have immense potential for the removal of heavy metals from water.
ISSN:2227-9717
2227-9717
DOI:10.3390/pr9122120