scholarly journals Removal of multiple heavy metal ions using a macromolecule chelating flocculant xanthated chitosan

2019 ◽  
Vol 79 (12) ◽  
pp. 2289-2297 ◽  
Author(s):  
Kai Yang ◽  
Gang Wang ◽  
Fulong Liu ◽  
Xin Wang ◽  
Xuemin Chen
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Practical Application ◽  
Removal Rates ◽  
Component Solution ◽  
Flocculation Test ◽  
Good Potential ◽  
Mixed Component ◽  
Performance And Mechanism

Abstract In this paper, the removal performance and mechanism of xanthated chitosan (XCTS) towards heavy metal ions are investigated. XCTS possesses both strong chelating abilities and excellent flocculation properties, which can effectively remove several kinds of heavy metal ions, such as Cr3+, Cu2+, Mn2+, Ni2+, Pb2+ and Zn2+. It has a good potential for practical application. In a flocculation test of a mixed component solution, the removal rates of Cr3+, Cu2+ and Cd2+ reach 100%, 100% and 99.1%, respectively. The removal rates are significantly greater than that of a single component solution. It indicates that there is a synergistic effect between different metal ions. Moreover, the selectivity of XCTS for Cr3+ and Cu2+ is obviously superior to that for Cd2+; XCTS is easier to combine with the heavy metal ions belonging to hard acids.

scholarly journals Modification of Salix americana willow bark for removal of heavy metal ions from aqueous solutions

2014 ◽  
Vol 16 (4) ◽  
pp. 41-44
Author(s):  
Iwona Rypińska ◽  
Marta Biegańska
Keyword(s):  
Heavy Metal ◽  
Nitric Acid ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Practical Application ◽  
Initial Concentration ◽  
Willow Bark ◽  
Removal Of Metal ◽  
Removal Of Metal Ions

Abstract Salix americana willow bark is a waste arising in the process of wicker decortication that so far has not found any practical application. The bark can adsorb metal ions, because in its composition among others are phenolic groups which may be involved in the removal of metal ions from water solutions. The results of sorption of copper(II) and zinc(II) on modified willow bark of Salix americana were presented. The bark was modified with nitric and sulfuric acids at concentrations ranging from 5 to 15%. The best adsorption results were obtained using 15% nitric acid for modification. Adsorption of metal ions from aqueous solutions at concentrations raging from 20 to 100 mg/dm3 was studied. It was found that an increase in the initial concentration of copper(II) and zinc(II) resulted in an increase in their adsorption on the modified cortex.

Removal of Cu, Ni, Zn, Cd and Pb in Artificial Acid Mine Drainage by Modified Oxygen Releasing Compounds

2014 ◽  
Vol 535 ◽  
pp. 758-763 ◽  
Author(s):  
Si Min Liu ◽  
Yu Long Liu ◽  
Jia Yu Song ◽  
Hao Deng
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Acid Mine Drainage ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Mine Drainage ◽  
Main Ingredient ◽  
Removal Rates ◽  
Acid Mine ◽  
Pb Ions

The aim of the study is to investigate removal of Cu, Ni, Zn, Cd and Pb in acid mine drainage (AMD) using modified oxygen releasing compounds (MORCs) of which CaO2 is the main ingredient. When the MORCs are placed into AMDs, OH- will be released gently and continuously which can neutralize H+ and precipitate heavy metal ions as hydroxide/carbonates. Four types of artificial AMDs contained Cu, Ni, Zn, Cd and Pb ions with/without sulfate were prepared in the laboratory. The removal rates of the heavy metals were measured after adding MORCs to the artificial AMDs. The results showed that the removal rates of Cu, Ni, Zn, Cd and Pb in all 4 artificial AMDs, after 72 hours, are more than 97%, even to 100%. However, after 96 hours, Cu, Ni, Zn, Cd and Pb deposits can be re-dissolved by 16.4%, 11.2%, 7.0%, 5.0% and 4.8%, respectively, in the single-metal artificial AMDs; Pb and Cd deposits are more stable. Sulfate in the multi-metal artificial AMD hardly has effects on re-dissolution of the heavy metal deposits; and only Ni deposits in the single-metal AMD with sulfate and Cu deposits in the single-metal AMD without sulfate are re-dissolved significantly. It suggested that the MORCs should be an efficient material to remove Cu, Ni, Zn, Cd and Pb from AMDs after 72 hours than lime or limestone.

Study on Adsorption of Heavy Metalion in Metallurgical Wastewater by Sepiolite

2013 ◽  
Vol 726-731 ◽  
pp. 2585-2588
Author(s):  
Xiu Yan Zhou ◽  
Xiang Xin Xue
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Metal Ions ◽  
Metal Ion ◽  
Heavy Metal Ions ◽  
Room Temperature ◽  
Adsorption Equilibrium ◽  
Removal Rates ◽  
Adsorption Time ◽  
Adsorbent Dosage

In this study, the sorption of heavy metals (Cu2+, Pb2+, Zn2+ and Cd2+) from simulated metallurgical wastewater by sepiolite under different dosage, pH, adsorption time and temperature conditions was investigated. The results showed that adsorption increased with the increase of adsorbent dosage until the adsorption equilibrium was reached. When the pH is 6, adsorption of heavy metal ions by sepiolite was in the order of Cu2+ > Zn2+ > Pb2+ > Cd2+ and removal rates of the metal ion were 91%, 90%, 91%, 84%, respectively. The effect of adsorption time on adsorption was not significant. At room temperature, with the adsorption time 45 min, the adsorption of metal ions is almost saturated, adsorption of Cu2+, Pb2+, Cd2+ and Zn2+ was 13.05mg/g, 85.47mg/g, 62.36mg/g and 15.67mg/g, respectively.

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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