Adsorption of Zinc from Aqueous Solutions Using  Modified Brazilian Gray Clay

Vasconcelos, Patrícia Noemia Mota de; Lima, Wagner Costa; Silva, Marta L. P.; Brito, André Luiz Fiquene de; Laborde, H. M.; Rodrigues, Meiry Gláucia Freire

doi:10.4236/ajac.2013.49065

Cited by 22 publications

(22 citation statements)

References 29 publications

(37 reference statements)

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“…It means that the proposed model adjusts the experimental data and, therefore, the kinetics of zinc ion adsorption on SIG untreated clay follows the pseudo-second-order model. This behavior agrees very well with other studies presented in the open literature regarding to experimental results of heavy metals removal [17,37,38].…”

Section: Pseudo-second-order Reaction Kineticsupporting

confidence: 92%

“…Vasconcelos et al [17] found 89.53% with Na-enriched gray clay in a finite bath system under the following process conditions: agitation of 150 rpm, pH of 8 and temperature of 27˚C for 5 h.…”

Section: Effect Of Contact Timementioning

confidence: 99%

“…Different adsorbents are used in zinc removal such as chitosan [12], eutrophic and oligotrofic marsh peat [13] and agricultural wastes like wheat shell [14] and cocoa shell [15]. Clays were tested for the removal of heavy metal ions by several researchers because of their low cost and availability [16][17][18][19][20][21]. This is due to their cation exchange capacity (CEC), selectivity, regenerability, and abundance compared to other natural and synthetic adsorbents.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

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Adsorption of Zn²⁺on Algerian untreated bentonite clay

Mohellebi

Lakel

2015

Desalination and Water Treatment

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A B S T R A C TThis work has the purpose of evaluating the removal of zinc from aqueous solutions using Algerian untreated bentonite clay as an adsorbent. The choice of using natural untreated clay is justified by the fact that it is both a low cost and friendly environmental adsorbent material. This local bentonite is a montmorillonite clay type with a relatively high cationic exchange capacity of 136.2 meq/100 g. Calcium is the main exchangeable cation. A granulometric analysis shows that 49.1% of the clay particles are submicronic. The zinc adsorption capacity of bentonite was studied in batch mode. A kinetic study shows a fast removal capacity and a highly influenced bentonite adsorption capacity by the operational parameters such as contact time, mass of adsorbent, metal concentration, pH, and temperature. Fifty percent of the Zinc was removed during the first 5 min and equilibrium is reached in 1 h. A maximal removal capacity is obtained for a bentonite concentration of 5 g L −1 and a zinc initial concentration of 100 mg L −1 . A pseudo-second-order kinetic model could be fitted to the experimental data. The equilibrium data could be fitted with a Langmuir isotherm equation. Depending on the negative value of ΔG, the adsorption of Zn 2+ on SIG untreated bentonite surfaces was spontaneous and the adsorption was an endothermic process.

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Section: Pseudo-second-order Reaction Kineticsupporting

confidence: 92%

Section: Effect Of Contact Timementioning

confidence: 99%

Section: Desalination and Water Treatmentmentioning

confidence: 99%

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Adsorption of Zn²⁺on Algerian untreated bentonite clay

Mohellebi

Lakel

2015

Desalination and Water Treatment

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“…The method of adsorption is widely used because of its easy function, low level of energy consumption, simple preservation, high capacity of adsorption and high efficiency for water and wastewater treatment (Jain et al 2015). This method makes use of various adsorbent like activated carbon, charcoal ashes, bentonite, clay, algaes, raw crab shell and bacteria (Wan Ngah et al 2011;Ahlam et al 2012;Patricia et al 2013;Haider et al 2014;Karnib et al 2014;Chuanqiang et al 2016). Recently, due to their availability, cost effectiveness and lack of toxicity, biopolymers have been adsorbent a proper adsorption of heavy metals by researchers (Haider et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Application of nanochitosan and chitosan particles for adsorption of Zn(II) ions pollutant from aqueous solution to protect environment

Seyedmohammadi

Motavassel

Maddahi

et al. 2016

Model. Earth Syst. Environ.

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Existence of heavy metals like zinc within water source is considered as one of the most important environmental problems. Accumulating within alive tissues, zinc raises various diseases and disorders. Chitosan is a hydrophilic polymer which is raised from acetyl groups of chitin from alkaline solution: it is employed widely as a well-known adsorbent for removing heavy metal ions. Present study aimed at optimizing the production of chitosan nano size particles by method of calvo and compared the adsorption of Zn (II) ions by chitosan macro and nano size particles. Adsorption experiments were conducted in a batch system and the effects of temperature, pH, contact time and initial concentration of metal ions on productivity of adsorption of zinc ions have been considered. Performing analysis DLS revealed that mean size of nano chitosan particles is 19.84 nm. Optimal adsorption by chitosan and nano chitosan has been done in pH 7 and about of 5. Efficiencies of both adsorbent were increased by increasing contact time. Both adsorbent had maximum efficiency at the temperature of 25°C. At the concentration of 10 mg/ L of zinc metal ions, maximum effective removal of chitosan macro and nano size particles were 90.80 and 99.10 %, respectively. Maximum capacity of adsorption by chitosan macro and nano size particle was 196.07 and 370.37 mg/g, respectively. Adsorption kinetics followed a pseudo second order model. Nanochitosan compared to chitosan particles had higher removal efficiency for Zinc metal ions due to nano size of particles, larger adsorption surfaces and more functional groups.

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“…Kaolinite, montmorillonite, and their poly and tetra butyl ammonium derivatives were used for removing Cd (II) from aqueous solution [11]. The removal of metal ions from aqueous solutions by adsorption has been reported by various studies: Pb(II), Zn(II), Cd(II), and Cu(II) onto natural clay [12]; radio nuclides (137Cs) on kaolinite [13]; Pb(II), Cu(II), Fe(III), Mn(II), and Zn(II) onto kaolinite clay [14]; Cd(II), Cu(II), Pb(II), and Zn(II) onto waste calcite sludge [15]; Zn(II), Cd(II), Pb(II), and Cu(II) onto natural Jordanian zeolite [16]; Pb(II), Cu(II), Cd(II), and Ni(II) onto Iranian natural zeolite [17]; Pb(II) and Cd(II) onto clay mineral beidellite [18]; and Zinc(II) onto modified Brazilian gray clay [19].…”

mentioning

confidence: 99%