Effect of membrane surface charge on filtration of heavy metal ions in the presence and absence of polyethylenimine

2012 ◽  
Vol 42 (1-3) ◽  
pp. 131-137 ◽  
Author(s):  
F. M. Almutairi ◽  
P. M. Williams ◽  
R. W. Lovitt
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Surface Charge ◽  
Heavy Metal Ions ◽  
Membrane Surface ◽  
Presence And Absence ◽  
Membrane Surface Charge

Surface charge of mesoporous calcium silicate and its adsorption characteristics for heavy metal ions

2020 ◽  
Vol 99 ◽  
pp. 106072 ◽  
Author(s):  
Lihua Liu ◽  
Siyan Liu ◽  
Hongliang Peng ◽  
Zhengchi Yang ◽  
Lu Zhao ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Surface Charge ◽  
Calcium Silicate ◽  
Heavy Metal Ions ◽  
Adsorption Characteristics

Fabrication of P(AN-MA)/rGO-g-PAO Superhydrophilic Nanofiber Membrane for Removal of Heavy Metal Ions

2020 ◽  
Vol 20 (3) ◽  
pp. 1685-1696 ◽  
Author(s):  
Weijing Wang ◽  
Na Han ◽  
Chao Yang ◽  
Wenxin Zhang ◽  
Jinlei Miao ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Water Solution ◽  
Membrane Surface ◽  
Rejection Rate ◽  
Nanofiber Membrane ◽  
Water Emulsion ◽  
Smooth Structures ◽  
Oil Water

The process in which the nanofiber membrane is used to remove heavy metal ions and separation of oil-water solution is analyzed. Herein, smooth structures are induced by rGO-g-PAO sheets, which could be attributed to the strong interaction between P(AN-MA) and rGO-g-PAO. It is rewarding to note that the P(AN-MA)/rGO-g-PAO nanofiber membrane would exhibit superhydrophilic traits in the air and ultra-low oil-adhesive traits underwater when the concentration of P(AN-MA) and PAO is 13 wt.% and 0.3 wt.%, respectively. The amidoxime (–C(NH2) NOH) groups on the membrane surface can efficiently adsorb copper (Cu(II)) (1.65 mmol/g) and chromium (Cr(VI)) (4.70 mmol/g) ions in the waste water. Meanwhile, the P(AN-MA)/rGO-g-PAO nanofiber membrane exhibits ultrahigh flux (~6150 LMH), satisfying rejection rate (~97%) and outstanding flux recovery ratio (~99%) in separating oil water emulsion.

Bioadsorption of Multiple Heavy Metal Ions by Rhizophora Apiculate sp. and Elaesis Guineensis sp.

2017 ◽  
Vol 14 (1) ◽  
pp. 15
Author(s):  
M.B. Nicodemus Ujih ◽  
Mohammad Isa Mohamadin ◽  
Milla-Armila Asli ◽  
Bebe Norlita Mohammed
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Removal Efficiency ◽  
Heavy Metal Ions ◽  
Agricultural Waste ◽  
Living Organism ◽  
Heavy Metal Concentration ◽  
Industrial Area ◽  
Electrochemical Treatment ◽  
Chemical Oxidation

Heavy metal ions contamination has become more serious which is caused by the releasing of toxic water from industrial area and landfill that are very harmful to all living organism especially human and can even cause death if contaminated in small amount of heavy metal concentration. Currently, peoples are using classic method namely electrochemical treatment, chemical oxidation/reduction, chemical precipitation and reverse osmosis to eliminate the metal ions from toxic water. Unfortunately, these methods are costly and not environmentally friendly as compared to bioadsorption method, where agricultural waste is used as biosorbent to remove heavy metals. Two types of agricultural waste used in this research namely oil palm mesocarp fiber (Elaesis guineensis sp.) (OPMF) and mangrove bark (Rhizophora apiculate sp.) (MB) biomass. Through chemical treatment, the removal efficiency was found to improve. The removal efficiency is examined based on four specification namely dosage, of biosorbent to adsorb four types of metals ion explicitly nickel, lead, copper, and chromium. The research has found that the removal efficiency of MB was lower than OPMF; whereas, the multiple metals ions removal efficiency decreased in the order of Pb2+ > Cu2+ > Ni2+ > Cr2+.

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