Unrevealing the biosorption capacity of freshwater algae biomasses for toxic heavy metals in aqueous solutions

2020 ◽  
Vol 184 ◽  
pp. 189-198
Author(s):  
Isha Shamshad ◽  
Sardar Khan ◽  
Said Muhammad ◽  
Muhammad Waqas
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Freshwater Algae ◽  
Toxic Heavy Metals ◽  
Biosorption Capacity

Removal and bioaccumulation of heavy metals from aqueous solutions using freshwater algae

2014 ◽  
Vol 71 (1) ◽  
pp. 38-44 ◽  
Author(s):  
Isha Shamshad ◽  
Sardar Khan ◽  
Muhammad Waqas ◽  
Nadeem Ahmad ◽  
Khushnood -Ur-Rehman ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Removal Efficiency ◽  
Controlled Environment ◽  
Cladophora Glomerata ◽  
Freshwater Algae ◽  
Average Temperature ◽  
Low Levels

Four freshwater algae, including Cladophora glomerata, Oedogonium westii, Vaucheria debaryana and Zygnema insigne, were tested for their bioaccumulation capacity for cadmium (Cd), chromium (Cr) and lead (Pb) in a controlled environment with an average temperature of 18 °C, and light/dark duration of 12:12 h. Experiments were performed in aqueous solutions containing selected heavy metals (HM) (ranging from 0.05 to 1.5 mg L−1) with 0.5 g of living algae at 18 °C and pH 6.8. The results indicated that C. glomerata was observed to be the most competent species for the removal of Cr, Cd and Pb from aqueous solutions. HM removal trends were in the order of Cd>Cr>Pb while the removal efficiency of selected algae species was in the order of C. glomerata, O. westii, V. debaryana and Z. insigne. The bioaccumulation capacity of C. glomerata, V. debaryana and Z. insigne was observed for different HM. Removal of HM was higher with low levels of HM in aqueous solutions. The results indicated that C. glomerata, O. westii, V. debaryana and Z. insigne had significant (P ≤0.01) diverse bioaccumulation capacity for Cr, Cd and Pb.

Removal of Mercury From Aqueous Solutions by ETS-4 Microporous Titanosilicate: Effect of Contact Time, Titanosilicate Mass and Initial Metal Concentration

2007 ◽  
Author(s):  
C. B. Lopes ◽  
M. Otero ◽  
Z. Lin ◽  
E. Pereira ◽  
C. M. Silva ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Contact Time ◽  
Sorption Process ◽  
Exchange Equilibrium ◽  
Toxic Heavy Metals ◽  
Experimental Conditions ◽  
Freundlich Isotherms ◽  
Pseudo Second Order ◽  
Microporous Titanosilicate

Mercury is one of the most toxic heavy metals present in the environment and therefore is extremely important develop new, simple and reliable techniques for its removal from aqueous solutions. A recent line of research within this context is the application of microporous materials. The use of these materials for removing heavy metals from solutions may become a potential clean-up technology in the field of wastewater treatment. In this work it is reported the application of microporous titanosilicate ETS-4 as ion exchanger to remove Hg2+ from aqueous solution. Under batch conditions, we studied the effect of contact time, titanosilicate mass and initial Hg2+ concentration. Only 5 mg of ETS-4 are required to purify 2 litres of water with 50 μg L−1 of metal. Under the experimental conditions, the initial Hg2+ concentration and ETS-4 mass have strong influence on the sorption process, and it is proved that 24 h are almost always sufficient to attain ion exchange equilibrium. Langmuir and Freundlich isotherms were used to fit equilibrium experimental results. The kinetics of mercury removal was reliably described by a pseudo second-order model. On the whole, ETS-4 shows considerable potential to remove Hg2+ from wastewaters.

scholarly journals Removal of Hg(ii) in aqueous solutions through physical and chemical adsorption principles

RSC Advances ◽  
2019 ◽  
Vol 9 (36) ◽  
pp. 20941-20953 ◽  
Author(s):  
Mengdan Xia ◽  
Zhixin Chen ◽  
Yao Li ◽  
Chuanhua Li ◽  
Nasir M. Ahmad ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Aqueous Solutions ◽  
Mercury Pollution ◽  
Chemical Adsorption ◽  
Toxic Heavy Metals ◽  
P Adsorption ◽  
Physical And Chemical

Adsorption has been the focus of research on the treatment of heavy metal mercury pollution since it is among the most toxic heavy metals in existence.

scholarly journals Applicability of the Pinus bark (Pinus elliottii) for the adsorption of toxic heavy metals from aqueous solutions

2012 ◽  
Vol 34 (1) ◽  
Author(s):  
Affonso Celso Gonçalves Junior ◽  
Leonardo Strey ◽  
Cleber Antonio Lindino ◽  
Herbert Nacke ◽  
Daniel Schwantes ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Pinus Elliottii ◽  
Toxic Heavy Metals

Biosorption of toxic heavy metals from aqueous solutions

2000 ◽  
Vol 75 (2) ◽  
pp. 163-165 ◽  
Author(s):  
S Senthilkumaar ◽  
S Bharathi ◽  
D Nithyanandhi ◽  
V Subburam
Keyword(s):  
Heavy Metals ◽  
Aqueous Solutions ◽  
Toxic Heavy Metals

scholarly journals Recovering Metals from Aqueous Solutions by Biosorption onto Hydrolyzed Olive Cake

Water ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2519 ◽  
Author(s):  
Rafael Fernández-González ◽  
María Ángeles Martín-Lara ◽  
Gabriel Blázquez ◽  
Antonio Pérez ◽  
Mónica Calero
Keyword(s):  
Heavy Metals ◽  
Nitric Acid ◽  
Aqueous Solutions ◽  
Fixed Bed ◽  
Solid Material ◽  
Hot Water ◽  
Isotherm Models ◽  
Olive Cake ◽  
Biosorption Capacity ◽  
The Impact

Olive cake obtained as a by-product from the olive oil industry has been evaluated as biosorbent of heavy metals from aqueous solutions in batch and continuous systems (fixed-bed columns). First, a complete study of effect of hydrothermal treatment with water on biosorption capacity of resulting solid was performed. Results showed that the values of biosorption capacity increased when the particle size of material decreased and the temperature of treatment increased. Then, hydrolyzed olive cake was treated by common chemicals (hot water, nitric acid, and sodium hydroxide) and the impact of chemical treatment was analyzed. The results were well reproduced by Langmuir and Freundlich isotherm models, getting maximum experimental biosorption capacities that changed between 42.34 mg/g obtained for the solid material modified by NaOH and 14.27 mg/g obtained for the solid material modified by nitric acid. Finally, laboratory tests in fixed-bed columns were performed with four different heavy metals and at three different inlet concentrations. The biosorption capacity increased from 2.83 mg/g (Cr), 4.51 mg/g (Cu), 12.30 mg/g (Pb), and 4.10 mg/g (Zn) to 3.08 mg/g (Cr), 5.17 mg/g (Cu), 13.21 mg/g (Pb), and 5.51 mg/g (Zn) when the concentration of metal ions increased, from 50 mg/L to 200 mg/L, respectively. Also, the experimental data obtained was successfully correlated with the Thomas, Yoon–Nelson, and dose–response models.

ASSESSMENT OF HEAVY METAL CONCENTRATION IN COCONUT WATER

1970 ◽  
pp. 07-10
Author(s):  
MdDidarul Islam, Ashiqur Rahaman, Aboni Afrose
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Heavy Metal Concentration ◽  
Coconut Water ◽  
Toxic Heavy Metals ◽  
High Concentration ◽  
Toxic Heavy Metal ◽  
Low Concentration ◽  
Wet Ashing ◽  
Aas Method

This study was based on determining concentration of essential and toxic heavy metal in coconut water available at a local Hazaribagh area in Dhaka, Bangladesh. All essential minerals, if present in the drinking water at high concentration or very low concentration, it has negative actions. In this study, fifteen samples and eight heavy metals were analyzed by Atomic Absorption Spectroscopy (AAS) method which was followed by wet ashing digestion method. The concentration obtained in mg/l were in the range of 0.3 to 1.5, 7.77 to 21.2, 0 to 0.71, 0 to 0.9, 0 to 0.2, 0.9 to 17.3, 0.1 to 0.9, 0 to 0.9 and 0 to 0.7 for Fe, Ni, Cu, Cd, Cr, Zn, Pb and Se respectively. From this data it was concluded that any toxic heavy metals like Cd, Cr, Pb and Ni exceed their toxicity level and some essential nutrients were in low concentration in those samples. 

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