Simultaneous removal of heavy metals from aqueous solutions by <i> Equisetum diffusum </i> D. Don

Equisetum diffusum D. Don was transplanted into solutions added with different concentrations of Mn, Zn, Cd, Pb, and As for 30 days in the laboratory experiment to assess the removal of these metals and their accumulation in the plant. The highest removal efficiency of Mn, Zn, Cd, Pb, and As from solutions by E. diffusum was 99.6, 97.9, 77.5, 85.3, and 61.9%, respectively. The highest daily removal efficiencies of heavy metals were obtained after 1 day of new solution addition. The highest concentrations of Mn, Zn, Cd, Pb, and As in the plant roots were 7230, 1490, 174, 1170, and 274 mg/kg-DW, respectively; those in the shoots were 1960, 566, 33.9, 308, and 108 mg/kg-DW. The bioconcentration factor (BCF) values for Mn, Zn, Cd, Pb, and As were 496, 406, 702, 463, and 191, respectively. The results of this study indicate that E. diffusum has the ability to remove simultaneously these metals from water, making it a potential species for phytoremediation of water contaminated with multiple heavy metals.

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SIMULTANEOUS REMOVAL OF SOME HEAVY METALS AND ARSENIC FROM AQUEOUS SOLUTIONS BY Phragmites australis

Vietnam Journal of Science and Technology ◽

10.15625/2525-2518/54/2a/11939 ◽

2018 ◽

Vol 54 (2A) ◽

pp. 259

Author(s):

Tran Thi Huyen Nga

Keyword(s):

Heavy Metals ◽

Aqueous Solutions ◽

Phragmites Australis ◽

Removal Efficiency ◽

Common Reed ◽

Plant Roots ◽

Simultaneous Removal ◽

Removal Rates ◽

Heavy Metals And Arsenic

In this study, Phragmites australis (common reed) was transplanted into solutions added with different concentrations of Mn, Zn, Cd, Pb, and As for 30 days in the laboratory (10 days of incubation and repeated three times without changing the plant) to assess the removal of these metals and its accumulation in the plant. The results showed that high removal efficiency was achieved by growing P.australis. The highest daily removal rates of heavy metals and As were obtained after 1 day of new solution addition. The highest concentrations of Mn, Zn, Cd, Pb, and As in the plant roots were 3920, 1020, 90.9, 1350, and 183 mg kg–1 dry wt., respectively; those in the stems were 465, 108, 26.4, 227, and 74.0 mg kg–1 dry wt.; and those in the leaves were 716, 150, 18.1, 157, and 88.3 mg kg–1 dry wt. The results of this study indicated that P. australis has the ability to remove simultaneously these metals from water, making it a potential species for phytoremediation of wastewater from Pb-Zn mine.

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Effect of Dissolved Silicon on the Removal of Heavy Metals from Aqueous Solution by Aquatic Macrophyte Eleocharis acicularis

Water ◽

10.3390/w11050940 ◽

2019 ◽

Vol 11 (5) ◽

pp. 940 ◽

Cited By ~ 1

Author(s):

Ha T.H. Nguyen ◽

Masayuki Sakakibara ◽

Minh N. Nguyen ◽

Nhuan T. Mai ◽

Vinh T. Nguyen

Keyword(s):

Heavy Metals ◽

Aqueous Solutions ◽

Metal Toxicity ◽

Laboratory Experiments ◽

Aquatic Macrophyte ◽

Scale Up ◽

Simultaneous Removal ◽

Removal Of Heavy Metals ◽

Removal Efficiencies ◽

Dissolved Silicon

Silicon (Si) has been recently reconsidered as a beneficial element due to its direct roles in stimulating the growth of many plant species and alleviating metal toxicity. This study aimed at validating the potential of an aquatic macrophyte Eleocharis acicularis for simultaneous removal of heavy metals from aqueous solutions under different dissolved Si. The laboratory experiments designed for determining the removal efficiencies of heavy metals were conducted in the absence or presence of Si on a time scale up to 21 days. Eleocharis acicularis was transplanted into the solutions containing 0.5 mg L−1 of indium (In), gallium (Ga), silver (Ag), thallium (Tl), copper (Cu), zinc (Zn), cadmium (Cd), and lead (Pb) with various Si concentrations from 0 to 4.0 mg L−1. The results revealed that the increase of dissolved Si concentrations enhanced removal efficiencies of E. acicularis for Ga, Cu, Zn, Cd, and Pb, while this increase did not show a clear effect for In, Tl, and Ag. Our study presented a notable example of combining E. acicularis with dissolved Si for more efficient removals of Cu, Zn, Cd, Pb, and Ga from aqueous solutions. The findings are applicable to develop phytoremediation or phytomining strategy for contaminated environment.

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Effect of Soil Washing Solutions on Simultaneous Removal of Heavy Metals and Arsenic from Contaminated Soil

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph17093133 ◽

2020 ◽

Vol 17 (9) ◽

pp. 3133 ◽

Cited By ~ 1

Author(s):

Kanghee Cho ◽

Eunji Myung ◽

Hyunsoo Kim ◽

Cheonyoung Park ◽

Nagchoul Choi ◽

...

Keyword(s):

Heavy Metals ◽

Sulfuric Acid ◽

Phosphoric Acid ◽

Contaminated Soil ◽

Contaminated Soils ◽

Soil Washing ◽

Metal Extraction ◽

Simultaneous Removal ◽

Removal Of Heavy Metals ◽

Removal Efficiencies

In this study, we investigated the feasibility of using a solution of sulfuric acid and phosphoric acid as an extraction method for soil-washing to remove Cu, Pb, Zn, and As from contaminated soil. We treated various soil particles, including seven fraction sizes, using sulfuric acid. In addition, to improve Cu, Pb, Zn, and As removal efficiencies, washing agents were compared through batch experiments. The results showed that each agent behaved differently when reacting with heavy metals (Cu, Pb, and Zn) and As. Sulfuric acid was more effective in extracting heavy metals than in extracting As. However, phosphoric acid was not effective in extracting heavy metals. Compared with each inorganic acid, As removal from soil by washing agents increased in the order of sulfuric acid (35.81%) < phosphoric acid (62.96%). Therefore, an enhanced mixture solution using sulfuric acid and phosphoric acid to simultaneously remove heavy metals and As from contaminated soils was investigated. Sulfuric acid at 0.6 M was adopted to combine with 0.6 M phosphoric acid to obtain the mixture solution (1:1) that was used to determine the effect for the simultaneous removal of both heavy metals and As from the contaminated soil. The removal efficiencies of As, Cu, Pb, and Zn were 70.5%, 79.6%, 80.1%, and 71.2%, respectively. The combination of sulfuric acid with phosphoric acid increased the overall As and heavy metal extraction efficiencies from the contaminated soil samples. With the combined effect of dissolving oxides and ion exchange under combined washings, the removal efficiencies of heavy metals and As were higher than those of single washings.

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EFFICIENCY OF USING BAKED SOIL ON REMOVING SOME HEAVY METALS FROM DIFFERENT WATER SOURCES

IRAQI JOURNAL OF AGRICULTURAL SCIENCES ◽

10.36103/ijas.v47i2.607 ◽

2016 ◽

Vol 47 (2) ◽

Author(s):

Thaher & et al.

Keyword(s):

Waste Water ◽

Heavy Metals ◽

Laboratory Experiment ◽

Removal Efficiency ◽

Water Sources ◽

Before And After ◽

Removal Efficiencies ◽

Different Water Sources

A laboratory experiment was carried out to study the effect of unbaked soil and baked soil burned at 4000C and 9000C as filters to remove some heavy metals (Mn,Cu,Pb,Cd) from three water sources (waste water, Shatt al-Arab and Shatt al-Basra) at four periods (0 , 1/2 , 1, 24 hours. Concentrations of these heavy metals were estimated before and after passing through these filters , and removal efficiency was calculated . The results showed that baked soil at 9000C had the highest removal efficiency compared with that of 4000C and without baking. Filtration at 24 hours was the best among other studied periods. The highest removal efficiencies were 95.20% foe Mn at Shatt al-Arab , 67.83% for Cu at Shatt al-Basra , 66.13% for Pb at Shatt al-Basra and 82.82% for Cd at Shatt al-Arab.

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Shell-in-shell monodispersed triamine-functionalized SiO2 hollow microspheres with micro-mesostructured shells for highly efficient removal of heavy metals from aqueous solutions

Journal of Environmental Chemical Engineering ◽

10.1016/j.jece.2018.102832 ◽

2019 ◽

Vol 7 (1) ◽

pp. 102832 ◽

Cited By ~ 19

Author(s):

Roozbeh Soltani ◽

Azam Marjani ◽

Saeed Shirazian

Keyword(s):

Heavy Metals ◽

Aqueous Solutions ◽

Hollow Microspheres ◽

Efficient Removal ◽

Highly Efficient ◽

Removal Of Heavy Metals

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Removal of heavy metals from aqueous solutions using activated carbon prepared fromCicer arietinum

Toxicological and Environmental Chemistry ◽

10.1080/02772241003614312 ◽

2010 ◽

Vol 92 (8) ◽

pp. 1447-1460 ◽

Cited By ~ 17

Author(s):

D.K.V. Ramana ◽

K. Jamuna ◽

B. Satyanarayana ◽

B. Venkateswarlu ◽

M. Madava Rao ◽

...

Keyword(s):

Heavy Metals ◽

Activated Carbon ◽

Aqueous Solutions ◽

Removal Of Heavy Metals

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Study on Adsorption of Cu and Ba from Aqueous Solutions Using Nanoparticles of Origanum (OR) and Lavandula (LV)

Bioinorganic Chemistry and Applications ◽

10.1155/2018/3936178 ◽

2018 ◽

Vol 2018 ◽

pp. 1-8 ◽

Cited By ~ 7

Author(s):

Ghadah M. Al-Senani ◽

Foziah F. Al-Fawzan

Keyword(s):

Heavy Metals ◽

Particle Size ◽

Free Energy ◽

Aqueous Solutions ◽

Thermodynamic Parameters ◽

Solution Ph ◽

Environment Friendly ◽

Removal Of Heavy Metals ◽

Equilibrium Data ◽

Langmuir And Freundlich Models

Wild herbs (Origanum (OR) and Lavandula (LV)) were used as environment-friendly adsorbents in this study. The adsorbents were used for adsorption of Cu and Ba from water. The adsorption of heavy metals onto OR and LV was dependent on particle size, dose, and solution pH. The diameter of adsorbent particles was less than 282.8 nm. The adsorption follows second-order kinetics. Langmuir and Freundlich models have been applied to describe the equilibrium data, and the thermodynamic parameters, the Gibbs free energy, ∆G°, enthalpy, ∆H°, and entropy, ∆S°, have been determined. The positive value of ∆H° suggests that the adsorption of heavy metals by the wild herbs is endothermic. The negative values of ∆G° at all the studied temperatures indicate that the adsorption is a spontaneous process. It can be concluded that OR and LV are promising adsorbents for the removal of heavy metals from aqueous solutions over a range of concentrations.

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Comparison of sorption efficiency of natural and MnO2 coated zeolite for copper removal from model solutions

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/900/1/012003 ◽

2021 ◽

Vol 900 (1) ◽

pp. 012003

Author(s):

M Balintova ◽

Z Kovacova ◽

S Demcak ◽

Y Chernysh ◽

N Junakova

Keyword(s):

Heavy Metals ◽

Removal Efficiency ◽

Ph Value ◽

Batch Experiments ◽

Modified Zeolite ◽

Optimum Ph ◽

Removal Of Heavy Metals ◽

Initial Ph ◽

Correlation Factors ◽

Maximum Removal

Abstract Removal of heavy metals from the environment is important for living beings. The present work investigates the applicability of the natural and MnO2 - coated zeolite as sorbent for the removal of copper from synthetic solutions. Batch experiments were carried out to identify the influence of initial pH and concentration in the process of adsorption. A maximum removal efficiency of Cu(II) was observed in 10 mg/L for natural (95.6%) and modified (96.4%) zeolite, where the values was almost identical, but at concentration of 500 mg/L was the removal efficiency of modified zeolite three times higher. Based on the correlation factors R2, the Langmuir isotherms better describe the decontamination process than Freundlich. The optimum pH value was set at 5.0.

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