Sorption kinetics, thermodynamics and competition of Ni2+ from aqueous solutions onto surface oxidized carbon nanotubes

As a low-cost adsorbent, biochar can be used as a low-cost adsorbent for wastewater treatment, particularly with respect to treating heavy metals in wastewater. A number of studies have demonstrated effective removal of heavy metals from aqueous solutions by biochar and, in some cases, proven the superiority of biochars to activated carbons. Among several factors Downloaded by [University of Nebraska, Lincoln] at 19:41 29 September 2015 ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT 2 affecting the sorption ability of biochars, feedstock materials play a significant role. This review incorporates existing literature to understand the overall sorption behavior of heavy metals on biochar adsorbents. Depending on the biochar type, heavy metal can be removed by different mechanisms such as complexation, physical sorption, precipitation and electrostatic interactions.Mathematical sorption models can be used to understand the efficiency of biochar at removing heavy metals, and promote the application of biochar technology in water treatment.

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“…Positive values of ΔS o may reflect an affinity of the carbon sorbent for the metal ions (Lu, et al 2009 …”

Section: Adsorption Thermodynamicsmentioning

confidence: 99%

A review of biochar as a low-cost adsorbent for aqueous heavy metal removal

Inyang

Gao

Yao

et al. 2015

Critical Reviews in Environmental Science and Technology

1,080

376

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“…In all of these studies, sorption capacity increased with increasing pH-values and with increasing concentration of metal ions. Again, the Langmuir isotherms were found as the corresponding theoretical model suggesting that monolayers of metal ions were formed on the adsorbent surface Lu et al, 2008Lu et al, , 2009El-Sheikh et al, 2011;Yavari et al, 2010).…”

Section: Adsorption Of Heavy Metal Ions and Aromatic Compounds On Cntmentioning

confidence: 98%

Interactions of carbon nanotubes with aqueous/aquatic media containing organic/inorganic contaminants and selected organisms of aquatic ecosystems – A review

et al. 2015

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“…If the desirability value is less than one, it means that optimization was achieved. The solution obtained from the design showed the desirability of getting a value of 1, which means that 100 % optimization was achieved [35,60,61]. The optimum conditions obtained from statistical analysis for the highest removal of Zn(II) were a pH of 10, an MCNT dosage of 0.05 g, a contact time of 60 min and an agitation speed of 160 rpm.…”

Section: Validation Of Optimized Zn(ii) Adsorption In Optimized Reactmentioning

confidence: 99%

Microwave-assisted synthesis of multi-walled carbon nanotubes for enhanced removal of Zn(II) from wastewater

et al. 2015

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Removal of toxic metals is one of the biggest challenges in ensuring safe water for all as well as protecting the environment. Novel multi-walled carbon nanotubes (MCNTs) have been successfully synthesised by microwave techniques and improved to be an outstanding adsorbent for the removal of Zn(II) from wastewater. The adsorption of Zn(II) was studied and optimized as a function of pH, initial Zn(II) concentration, MCNT dosage, agitation speed, and adsorption time. In order to investigate the dynamic behavior of MCNTs as an adsorbent, the kinetic data were modeled using pseudo-first-order and second-order kinetic models. Different thermodynamic parameters, viz., DH°, DS°and DG°have also been evaluated and it has been found that the adsorption was feasible, spontaneous and endothermic in nature. Statistical analysis reveals that the optimum conditions for the highest removal (99.9 %) of Zn(II) are at pH 10, a MCNT dosage 0.05 g, an agitation speed and time of 160 rpm and 60 min, respectively, with an initial concentration of 10 mg/L. On the basis of the Langmuir model, q m was calculated to be 90.9 mg/g & J. N. Sahu jay_sahu@yahoo.co.in N. M. Mubarak for microwave-synthesized MCNTs. Our results proved that MCNTs can be used as an effective Zn(II) adsorbent due to their high adsorption capacity as well as the short adsorption time needed to achieve equilibrium. Hence, MCNTs serve an important role in the removal of heavy metals from wastewater.

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Sorption kinetics, thermodynamics and competition of Ni2+ from aqueous solutions onto surface oxidized carbon nanotubes

Cited by 59 publications

References 21 publications

A review of biochar as a low-cost adsorbent for aqueous heavy metal removal

A review of biochar as a low-cost adsorbent for aqueous heavy metal removal

Interactions of carbon nanotubes with aqueous/aquatic media containing organic/inorganic contaminants and selected organisms of aquatic ecosystems – A review

Microwave-assisted synthesis of multi-walled carbon nanotubes for enhanced removal of Zn(II) from wastewater

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