Macrocyclic pyridone pentamer‐modified polystyrene nanofiber for selective metal ion removal from aqueous solution

The batch removal of Cu(II), Cd(II) and Pb(II) from individual heavy metal ion aqueous synthetic solution using biosurfactants produced by Pseudomonas aeruginosa with corn oil as substrate was investigated. The metal ion removal process of crude preparation biosurfactants (CPB) was established to be dependent on the initial pH and contact time. The optimum metal removal was observed at pH 6.0 of the initial metal solution and 10 min of contact time. The affinity sequence for metal ion removal was Pb(II)>Cd(II)>Cu(II). The removal capacity value of biosurfactant for Cu(II), Cd(II) and Pb(II) from single metal ions solution were 0.169, 0.276 and 0.323 mg/g, respectively. The removal capacity value of biosurfactant for Cu(II), Cd(II) and Pb(II) from multi metal ions solution were 0.064, 0.215 and 0.275 mg/g, respectively. The removal capacity of individual metal ion was diminished by the presence of other metal ions in multi metal ions from synthetic aqueous solution. The removal capacity value of biosurfactant for Cu(II), Cd(II) and Pb(II) from silver industry wastewater were 0.027, 0.055 and 0.291 mg/g, respectively. The results indicated that biosurfactants have potential to be used in the remediation of heavy metals in industrial wastewater.

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Removal of Cd (II) ions from Aqueous Solution by Adsorption on Activated Carbon Prepared from Lapsi (Choerospondias axillaris) Seed Stone

Journal of the Institute of Engineering ◽

10.3126/jie.v11i1.14708 ◽

2016 ◽

Vol 11 (1) ◽

pp. 140-150 ◽

Cited By ~ 1

Author(s):

Rajeshwar Man Shrestha

Keyword(s):

Aqueous Solution ◽

Activated Carbon ◽

Metal Ion ◽

Activated Carbons ◽

Freundlich Isotherm ◽

Batch Adsorption ◽

Metal Ion Removal ◽

Ion Removal ◽

Equilibrium Data ◽

Methylene Blue Number

Batch adsorption experiments were conducted for the adsorption of Cd (II) ions from aqueous solution by activated carbon prepared from Lapsi seed stone. The activated carbon was characterized by Iodine number, Methylene blue number, SEM and FTIR. Adsorption experiments were carried out to describe the effect of pH ,contact time and adsorbent dose on the metal ion removal process .The results showed that the adsorption of Cd (II) ions was very fast initially and the equilibrium time was 3 hrs.The pH of 6.0 was an optimal pH for adsorption of Cd(II) ions. Langmuir and Freundlich adsorption isotherms were used to explain the equilibrium data. Langmuir model best described the data with higher value of coeffcient of determination as −1 compared to that of Freundlich isotherm showing a maximum uptake of 37.0 mgg . This study demonstrated that the activated carbons prepared from Lapsi seed stone could be used for the removal of Cd (II) ions in water treatment. Journal of the Institute of Engineering, 2015, 11(1): 140-150

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Thermoresponsive Ion-Imprinted Composite Hydrogels for Heavy Metal Ion Removal

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.661.162 ◽

2013 ◽

Vol 661 ◽

pp. 162-165 ◽

Cited By ~ 2

Author(s):

Jing Jing Wang ◽

Xian Ning Li

Keyword(s):

Aqueous Solution ◽

Heavy Metal ◽

Metal Ion ◽

Heavy Metal Ions ◽

Metal Ion Removal ◽

Ion Removal ◽

Ion Imprinted ◽

Heavy Metal Ion Removal ◽

Gel Transition

A novel thermoresponsive Cu(II) ion-imprinted composite hydrogel [Cu(II)-IICH] based on N-isopropylacrylamide (NIPAM) and aminated silica (SiO2-NH2) has been prepared by in situ free-radical polymerization using Cu(II) ion as template. The Cu(II)-IICH was used to remove heavy metal ions from aqueous solution at 20 and 40oC. The Cu(II)-IICH selectively bound the template ion above a critical gel transition temperature (CGTT) of crosslinked poly(N-isopropylacrylamide) (PNIPAM). The memory was fixed by shrinking above the CGTT, and was deleted by swelling below the CGTT. In order to study the reusability of the Cu(II)-IICH, the sorption-desorption cycles were performed for five times. The results suggested that the Cu(II)-IICH can be used for several times without significantly decreasing its adsorption capacity.

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