Selective separation of Hg(II) and Cd(II) from aqueous solutions by complexation–ultrafiltration process

Zeng, Jian; Ye, Hong Qi; Huang, Nian Dong; Liu, Jun Feng; Li, Zheng

doi:10.1016/j.chemosphere.2009.05.019

Cited by 33 publications

(7 citation statements)

References 17 publications

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“…One important advantage of the CP–UF technique is the possibility to achieve high selectivity by using a proper selective binding agent. This selectivity can be due to the chemical properties of the complexing agent, allowing it to complex one specific metal ion, and/or to the opportune choice of the operating conditions [ 109 , 110 ]. The complexing agent/metal weight ratio and the operating pH are the main operating parameters that affect the complexation step.…”

Section: Hmps Obtained By Coupling Membrane Processes With Water Smentioning

confidence: 99%

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Application of Hybrid Membrane Processes Coupling Separation and Biological or Chemical Reaction in Advanced Wastewater Treatment

2020

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The rapid urbanization and water shortage impose an urgent need in improving sustainable water management without compromising the socioeconomic development all around the world. In this context, reclaimed wastewater has been recognized as a sustainable water management strategy since it represents an alternative water resource for non-potable or (indirect) potable use. The conventional wastewater remediation approaches for the removal of different emerging contaminants (pharmaceuticals, dyes, metal ions, etc.) are unable to remove/destroy them completely. Hybrid membrane processes (HMPs) are a powerful solution for removing emerging pollutants from wastewater. On this aspect, the present paper focused on HMPs obtained by the synergic coupling of biological and/or chemical reaction driven processes with membrane processes, giving a critical overview and particular emphasis on some case studies reported in the pertinent literature. By using these processes, a satisfactory quality of treated water can be achieved, permitting its sustainable reuse in the hydrologic cycle while minimizing environmental and economic impact.

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Section: Hmps Obtained By Coupling Membrane Processes With Water Smentioning

confidence: 99%

“…One year later Zeng et al [ 110 ] tested the possibility to obtain the selective separation of Hg(II) from Cd(II) by the CP–UF process. The water-soluble polymer poly (acrylic acid) sodium salt was used as the complexing agent.…”

Section: Hmps Obtained By Coupling Membrane Processes With Water Smentioning

confidence: 99%

Application of Hybrid Membrane Processes Coupling Separation and Biological or Chemical Reaction in Advanced Wastewater Treatment

2020

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“…Then, these complexes are trapped and concentrated by ultrafiltration membranes, whereas unbound metal ions are allowed to pass through. Different polymers, such as poly(vinyl alcohol) [ 34 ], sulfonated poly(vinyl alcohol) [ 35 , 36 ], poly(ammonium acrylate) [ 37 ], poly(acrylic acid) [ 38 , 39 , 40 ], polyethylenimine [ 41 , 42 , 43 , 44 ], and polystyrene sulfonate [ 45 ] have been used for metal removal from wastewater. We targeted this application for the as-prepared gelatin membranes to study if they could withstand different conditions of use such as changes in pressure and in pH.…”

Section: Introductionmentioning

confidence: 99%

Porous Gelatin Membranes Obtained from Pickering Emulsions Stabilized with h-BNNS: Application for Polyelectrolyte-Enhanced Ultrafiltration

Mateur

Ortiz

Ennigrou³

et al. 2020

Membranes

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In recent years, numerous studies have been conducted to develop biopolymer-based membranes, highlighting the challenges to prepare porous structures with control porosity. In this paper an innovative method that relies on the generation of Pickering emulsions was developed to prepare porous membranes from gelatin for filtration purpose. Hexagonal boron nitride nanosheets (h-BNNS) were used to stabilize micro-droplets of castor oil in a continuous homogeneous gelatin solution. Two steps in the membrane preparation process strongly influenced the porous structure. Specifically, the duration of the drying time after emulsion casting and the duration of the cross-linking step affected membrane pore size, hydrophobicity, water swelling, and water permeability. By controlling these two steps, membranes could be designed with pore size between 0.39 and 1.60 μm and display pure water permeability between 150 and 506 L h−1 m−2 bar−1. These membranes have been tested for complexation–ultrafiltration experiments in which iron ions were removed from aqueous solutions with/without poly (acrylic acid) (PAA). Without PAA, the removal of free iron (II) ions was low (not more than 14%). The addition of PAA (200 ppm) allowed obtaining high removal rates (97%) at pH ≥ 5 with 3 bars of transmembrane pressure.

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“…Over the past decade, researchers have increasingly focused on so-called the modifi ed technique of micellar enhanced ultrafi ltration (MEUF) and it is found that by adding an appropriate surfactant in solution, the effi ciency of ultrafi ltration can be further improved 1,2 . At present, MEUF is seen as one of the potential techniques for the surfactant-based removal of heavy metal ions from wastewater 3,4 .…”

Section: Introductionmentioning

confidence: 99%

Ultrafiltration treatment of wastewater contained heavy metals complexed with palygorskite

Ren

Cao

Yang

et al. 2020

Polish Journal of Chemical Technology

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Palygorskite was applied in complexation-ultrafiltration treatment of heavy metals in wastewater under different pH and ionic strength. The results indicated that the rejection of heavy metals increased significantly with pH value, and decreased slightly with an increase of ionic strength of Na+ and Cl–. A certain concentration of NaCl significantly reduced the rejection rate of Cu2+. The rejection of Cu2+, Zn2+ and Cd2+ could reach over 86.8%, 93.6% and 93.7% at pH of 7 and 0.1 mol/L NaCl. The rejection of heavy metals was severely affected by low molecular weight competing complexing agents and the effect of sodium tartrate was greater than triethanolamine. In the presence of sodium tartrate, the rejection of Cu2+, Zn2+ and Cd2+ could arrive over 81.4%, 57.6% and 60.5% at pH of 7 in 20 min. Palygorskite was offered a potential complexing agent for the removal of heavy metals in wastewater at the complexation-ultrafiltration process.

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Selective separation of Hg(II) and Cd(II) from aqueous solutions by complexation–ultrafiltration process

Cited by 33 publications

References 17 publications

Application of Hybrid Membrane Processes Coupling Separation and Biological or Chemical Reaction in Advanced Wastewater Treatment

Application of Hybrid Membrane Processes Coupling Separation and Biological or Chemical Reaction in Advanced Wastewater Treatment

Porous Gelatin Membranes Obtained from Pickering Emulsions Stabilized with h-BNNS: Application for Polyelectrolyte-Enhanced Ultrafiltration

Ultrafiltration treatment of wastewater contained heavy metals complexed with palygorskite

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