MAGNETIC GRAPHENE OXIDE AS ADSORBENT FOR THE REMOVAL OF LEAD(II) FROM WATER SAMPLES

2016 ◽  
Vol 78 (3-2) ◽  
Author(s):  
Hamid Rashidi Nodeh ◽  
Wan Aini Wan Ibrahim ◽  
Mohd Marsin Sanagi
Keyword(s):  
Graphene Oxide ◽  
Adsorption Isotherm ◽  
Water Samples ◽  
Freundlich Isotherm ◽  
Environmental Water ◽  
Environmental Water Samples ◽  
Maximum Adsorption Capacity ◽  
Solution Ph ◽  
Magnetic Graphene Oxide ◽  
Flame Atomic Absorption

Magnetic Fe3O4 nanoparticles were prepared on graphene oxide (Fe3O4/GO) in situ in a one step process. The obtained Fe3O4/GO was used as an adsorbent for the removal for Pb(II) from environmental water samples prior to flame atomic absorption spectroscopy measurement. The adsorption procedure was optimized as follows: 60 min adsorption time, 50 mL sample volume, solution pH 4.5, and 25 mg adsorbent dosage. Under the optimum conditions, the adsorption efficiency obtained was greater than 75% (C = 50 mg L-1). The adsorption isotherm of Fe3O4@GO magnetic adsorbent was studied for Pb(II) adsorption using two isotherm adsorption models namely Langmuir and Freundlich. The adsorption isotherm data fits well with Langmuir isotherm (R2 = 0.9988) rather than with Freundlich isotherm. The maximum adsorption capacity (qm) obtained was 86.2 mg g-1. The results signified that the prepared Fe3O4/GO nanocomposite has a great adsorptive ability towards the Pb(II) from environmental water samples.

scholarly journals Graphene Quantum Dots Sensor for the Determination of Graphene Oxide in Environmental Water Samples

2014 ◽  
Vol 86 (24) ◽  
pp. 12279-12284 ◽  
Author(s):  
Sandra Benítez-Martínez ◽  
Ángela Inmaculada López-Lorente ◽  
Miguel Valcárcel
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Water Samples ◽  
Graphene Quantum Dots ◽  
Environmental Water ◽  
Environmental Water Samples

Adsorption of cadmium(II) from aqueous solution onto activated carbon

1997 ◽  
Vol 35 (7) ◽  
pp. 205-211 ◽  
Author(s):  
R. Leyva-Ramos ◽  
J. R. Rangel-Mendez ◽  
J. Mendoza-Barron ◽  
L. Fuentes-Rubio ◽  
R. M. Guerrero-Coronado
Keyword(s):  
Activated Carbon ◽  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Freundlich Isotherm ◽  
Carbon Surface ◽  
Maximum Adsorption Capacity ◽  
Solution Ph ◽  
Ph Values ◽  
Average Percent Deviation ◽  
Initial Ph

The adsorption isotherm of cadmium on activated carbon was measured in a batch adsorber. Effects of temperature and solution pH on the adsorption isotherm were investigated by determining the adsorption isotherm at temperatures of 10, 25, and 40°C and at initial pH values from 2 to 8. Langmuir isotherm better fitted the experimental data since the average percent deviation was lower than with the Freundlich isotherm It was noticed that the amount of Cd2+ adsorbed was reduced about 3 times by increasing the temperature from 10 to 40°C. It was found that Cd2+ was not adsorbed on activated carbon at pH of 2 or lower and that Cd2+ was precipitated out as Cd(OH)2 at pH values above 9. Maximum adsorption capacity was observed at pH of 8 and the adsorption capacity was decreased about 12 times by reducing the initial pH from 8 to 3. According to the cadmium speciation diagram the predominant species below pH of 8 is Cd2+. Thus, cadmium was adsorbed on the activated carbon surface as Cd2+. It was concluded that the adsorption capacity is a strong function of pH and temperature.

Functionalization of Reduced Graphene Oxide with β-cyclodextrin Modified Palladium Nanoparticles for the Detection of Hydrazine in Environmental Water Samples

2016 ◽  
Vol 29 (2) ◽  
pp. 587-594 ◽  
Author(s):  
Subramanian Sakthinathan ◽  
Subbiramaniyan Kubendhiran ◽  
Shen-Ming Chen ◽  
Pedaballi Sireesha ◽  
Chelladurai Karuppiah ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Water Samples ◽  
Palladium Nanoparticles ◽  
Environmental Water ◽  
Environmental Water Samples ◽  
Reduced Graphene
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