Influence of pH on heavy metal speciation and removal from wastewater using micellar-enhanced ultrafiltration

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 membr...

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Published in:Chemosphere (Oxford) Vol. 173; pp. 199 - 206
Main Authors: Huang, Jinhui, Yuan, Fang, Zeng, Guangming, Li, Xue, Gu, Yanling, Shi, Lixiu, Liu, Wenchu, Shi, Yahui
Format: Journal Article
Language:English
Published: England Elsevier Ltd 01.04.2017
Subjects:
anionic surfactants
cadmium
Cadmium - isolation & purification
copper
Copper - isolation & purification
Heavy metal speciation
heavy metals
Hydrogen-Ion Concentration
hydrophilicity
lead
metal ions
Metals, Heavy - isolation & purification
Micellar-enhanced ultrafiltration
Micelles
Removal efficiency
Sodium Dodecyl Sulfate
Surface-Active Agents - chemistry
ultrafiltration
Ultrafiltration - methods
wastewater
Water Pollutants, Chemical - isolation & purification
zinc
Zinc - isolation & purification
Heavy metal speciation
pH
Removal efficiency
Micellar-enhanced ultrafiltration
ISSN:0045-6535, 1879-1298
Online Access:Get full text
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Summary: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 Pb2+ > Cd2+ > Zn2+ > Cu2+. These results showed that pH is a key parameter in metal ion speciation and removal during MEUF. •Heavy metal speciation under different pH was simulated using Visual MINTEQ.•The effect of pH on heavy metal removal during MEUF was investigated.•A correlation for heavy metal ions speciation and removal efficiency was developed.
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ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2016.12.137