Investigation of competitive adsorption and desorption of heavy metals from aqueous solution using raw rock: Characterization kinetic, isotherm, and thermodynamic

Background: The presence of pollutants in polluted water is not singularized hence pollutant species are constantly in competition for active sites during the adsorption process. A key advantage of competitive adsorption studies is that it informs on the adsorbent performance in real water treatment applications. Objective: This study aims to investigate the competitive adsorption of Pb(II), Cu(II), Fe(II) and Zn(II) using elephant grass (Pennisetum purpureum) biochar and hybrid biochar from LDPE. Method: The produced biochar was characterised by Scanning Electron Microscopy (SEM) and Fourier Transform Infrared Spectroscopy (FTIR). The effect of adsorption parameters, equilibrium isotherm modelling and parametric studies were conducted based on data from the batch adsorption experiments. Results: For both adsorbents, the removal efficiency was >99% over the domain of the entire investigation for dosage and contact time suggesting that they are very efficient for removing multiple heavy metals from aqueous media. It was observed that removal efficiency was optimal at 2 g/l dosage and contact time of 20 minutes for both adsorbent types. The Elovich isotherm and the pseudo-second order kinetic models were best-fit for the competitive adsorption process. Conclusion: The study was able to successfully reveal that biomass biochar from elephant grass and hybrid biochar from LDPE can be used as effective adsorbent material for the removal of heavy metals from aqueous media. This study bears a positive implication for environmental protection and solid waste management.

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Removal of heavy metals from aqueous solution using carbon-based adsorbents: A review

Journal of Water Process Engineering ◽

10.1016/j.jwpe.2020.101339 ◽

2020 ◽

Vol 37 ◽

pp. 101339 ◽

Cited By ~ 8

Author(s):

Chengyu Duan ◽

Tianyu Ma ◽

Jianyu Wang ◽

Yanbo Zhou

Keyword(s):

Heavy Metals ◽

Aqueous Solution ◽

Removal Of Heavy Metals ◽

Carbon Based

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The removal of heavy metals from aqueous solution using natural Jordanian zeolite

Applied Water Science ◽

10.1007/s13201-016-0382-7 ◽

2016 ◽

Vol 7 (4) ◽

pp. 2021-2028 ◽

Cited By ~ 29

Author(s):

Yazan Taamneh ◽

Suhail Sharadqah

Keyword(s):

Heavy Metals ◽

Aqueous Solution ◽

Removal Of Heavy Metals

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Advances in Graphene for Adsorption of Heavy Metals in Wastewater

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.550-553.2121 ◽

2012 ◽

Vol 550-553 ◽

pp. 2121-2124 ◽

Cited By ~ 4

Author(s):

Ling Ling Luo ◽

Xing Xing Gu ◽

Jun Wu ◽

Shu Xian Zhong ◽

Jian Rong Chen

Keyword(s):

Waste Water ◽

Heavy Metals ◽

Aqueous Solution ◽

Graphene Oxide ◽

Physical Structure ◽

High Specific Surface Area ◽

Functionalized Graphene ◽

Storage Material ◽

Energy Storage Material ◽

Material Composite

Graphene for its unique physical structure, excellent mechanical, electrical and physical properties has been widely applied in nanoelectronics, microelectronics, energy storage material, composite materials and so on. In recent years, many researchers found graphene have outstanding adsorption capacity of contaminants in aqueous solution due to its high specific surface area. This paper summarized the graphene, graphene oxide and functionalized graphene removing various heavy metals in waste water.

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Removal of Heavy Metals from Aqueous Solution by Hydroxyapatite/Chitosan Composite

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.789.176 ◽

2013 ◽

Vol 789 ◽

pp. 176-179 ◽

Cited By ~ 3

Author(s):

Eny Kusrini ◽

Nofrijon Sofyan ◽

Dwi Marta Nurjaya ◽

Santoso Santoso ◽

Dewi Tristantini

Keyword(s):

Heavy Metals ◽

Aqueous Solution ◽

Metal Ions ◽

Precipitation Method ◽

X Ray Diffraction ◽

X Ray ◽

Removal Of Heavy Metals ◽

Sem Micrograph ◽

Pseudo Second Order ◽

Chitosan Composite

Hydroxyapatite/chitosan (HApC) composite has been prepared by precipitation method and used for removal of heavy metals (Cr6+, Zn2+and Cd2+) from aqueous solution. The HAp and 3H7C composite with HAp:chitosan ratio of 3:7 (wt%) were characterized by Fourier transform infrared spectroscopy, X-ray diffraction and scanning electron microscopy-energy dispersive X-ray spectroscopy. The SEM results showed that HAp is spherical-shaped and crystalline, while chitosan has a flat structure. SEM micrograph of 3H7C composite reveals crystalline of HAp uniformly spread over the surface of chitosan. The crystal structure of HAp is maintained in 3H7C composite. Chitosan affects the adsorption capacity of HAp for heavy metal ions; it binds the metal ions as well as HAp. The kinetic data was best described by the pseudo-second order. Surface adsorption and intraparticle diffusion take place in the mechanism of adsorption process. The binding of HAp powder with chitosan made the capability of composite to removal of Cr6+, Zn2+and Cd2+from aqueous solution effective. The order of removal efficiency (Cr6+> Cd2+> Zn2+) was observed.

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