Application of termite nest for adsorption of Cr(VI)

Araújo, Bruno Rafael; Reis, Jennifer; Rezende, Edivaltrys Inayve Pissinati de; Mangrich, Antônio S.; Wisniewski, Alberto; Dick, Deborah Pinheiro; Romão, Luciane Pimenta Cruz

doi:10.1016/j.jenvman.2013.07.004

Cited by 26 publications

(11 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, most of these methods suffer from some disadvantages such as the high cost and difficult to implement, ect. (Araújo et al, 2013;Yang et al, 2014). The technique of adsorption adopted, is considered as promising and an interesting alternative to operate mainly using biomaterials (Gupta and Rastogi, 2009;Ponce et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Valorization of raw biomaterial waste-date stones-for Cr (VI) adsorption in aqueous solution: Thermodynamics, kinetics and regeneration studies

Khelaifia

Hazourli

Nouacer

et al. 2016

International Biodeterioration & Biodegradation

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Valorization of raw biomaterial waste-date stones-for Cr (VI) adsorption in aqueous solution: Thermodynamics, kinetics and regeneration studies

Khelaifia

Hazourli

Nouacer

et al. 2016

International Biodeterioration & Biodegradation

View full text Add to dashboard Cite

“…Application of the linear Freundlich model gave values of n equal to 5.65, 3.31 and 2.92 for Pb 2+ , Cd 2+ and Ni 2+ , respectively, reflecting a favorable adsorption process and satisfying the condition of heterogeneity (1 < n < 10 and 0 < 1/ n < 1), as required by the model. [24] Adsorption kinetics Adsorption kinetics describes the metal uptake rate at the solid-solution interface. Thus, it is important to understand the reaction mechanism and design appropriate sorption treatment plants.…”

Section: Effect Of Adsorbent Massmentioning

confidence: 99%

Validity of Egyptian Na‐montmorillonite for adsorption of Pb²⁺, Cd²⁺ and Ni²⁺ under acidic conditions: characterization, isotherm, kinetics, thermodynamics and application study

Taha

Shreadah

Heiba

et al. 2017

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

This study investigated the applicability of natural Egyptian Na-montmorillonite (Na-MMT) to remove Pb 2+ , Cd 2+ and Ni 2+ under acidic conditions that mimic industrial wastewater acidity. Cation exchange capacity of Na-MMT was found 91 meq/100 g and the specific surface area 42 m 2 g À1 . The adsorbent was characterized using X-ray fluorescence, scanning electron micrograph that showed significant morphological changes after adsorption and Fourier transform infrared spectroscopy, which confirmed that the adsorption occurred mainly in the lattice region. Removal efficiency was evaluated as a function of pH, contact time, initial concentration, and adsorbent mass. Acidic pH value was chosen for the following experiments. Langmuir and Freundlich isotherm models were applied. Freundlich model showed better fitting suggesting heterogeneous adsorption scenario. Freundlich capacity values decreased in the order of Pb 2+ (3.71 mg g À1 ) > Cd 2+ (2.45 mg g À1 ) > Ni 2+ (1.76 mg g À1 ). Kinetic data were accurately fitted to pseudo-second-order, indicating the adsorption occurrence in the interior surface of Na-MMT and the contribution of internal diffusion mechanism was significant. Intraparticle diffusion model gave multi-linear curves so more than onestep controlled the adsorption process. Under temperature range 290-328 K, thermodynamic parameters revealed that adsorption of Pb 2+ and Cd 2+ was spontaneous but Ni 2+ non-spontaneous. Adsorption was exothermic for Pb 2+ and Ni 2+ but endothermic for Cd 2+ . Arrhenius activation energy values were 5.78, 8.51 and 11.45 kJ mol À1 for Pb 2+ , Cd 2+ and Ni 2+ respectively stating the physical adsorption. Na-MMT reusability was confirmed by regeneration experiments. Application study showed excellent efficiency of Na-MMT within range (23.4-81.2%) removal for Pb 2+ , Cd 2+ and Ni 2+ from textile dyeing and tannery wastewater. *Effect of pH was studied in the pH range 2-7 while keeping other parameters constant at 't = 60 min; C o = 10 mg L À1 ; adsorbent mass = 0.25 g; agitation speed = 100 rpm and T = 298 K'.A. A. TAHA ET AL. Figure 6. Effect of adsorbent mass 'adsorbent mass (0.12-0.500) g, t = 60 min, pH = 3.8, C o = 10 mg/L, agitation speed = 100 rpm and T = 298 K'.Figure 7. Linearized isotherm models (a) Langmuir model and (b) Freundlich model. 'C o = (5-30) mg/L, t = 60 min, pH = 3.8, adsorbent mass = 0.25 g, agitation speed = 100 rpm and T = 298 K'.Figure 8. The linear plots of the pseudo-second-order model for (a) Pb +2 , (b) Cd +2 and (c) Ni +2 . 'C o = (5-20) mg/L, t = (1-60) min, pH = 3.8, adsorbent mass = 0.25 g, agitation speed = 100 rpm and T = 298 K'.Figure 9. Intraparticle diffusion plots for (a) Pb +2 , (b) Cd +2 , and (c) Ni +2 . 'C o = (5-20) mg/L, t = (1-60) min, pH = 3.8, adsorbent mass = 0.25 g, agitation speed = 100 rpm and T = 298 K'.

show abstract

“…The adsorption efficiency (%) and the sorption quantities of Sb(III) for RPMC and CTS-mPMC sorbents (mg g 21 ) were calculated based the equations presented in literature [36]. Before the adsorption operations, the pH of solution, initial metal concentration, contact time, adsorbent concentration and temperature were optimized systematically.…”

Section: The Batch Adsorption Proceduresmentioning

confidence: 99%

“…Sb(III) concentration in the solution after the filtration was measured using HG-AAS. The adsorption efficiency (%) and the sorption quantities of Sb(III) for RPMC and CTS-mPMC sorbents (mg g 21 ) were calculated based the equations presented in literature [36].…”

Section: The Batch Adsorption Proceduresmentioning

confidence: 99%

Application of chitosan‐modified pumice for antimony adsorption from aqueous solution

Sarı

Tüzen

Kocal

2017

Env Prog and Sustain Energy

View full text Add to dashboard Cite

In this study, raw pumice (RPMC) was modified successfully by using chitosan and then used to remove of antimony (Sb(III)) ions from aqueous solutions. The chitosan modified pumice (CTS‐mPMC) sorbent was characterized by using scanning electron microscopy (SEM), energy dispersive X‐ray spectroscopy (EDAX), X‐ray diffraction (XRD), and Fourier Transform‐Infrared (FT‐IR) spectroscopy analysis techniques. The dependency of the adsorption efficiency on initial pH, contact time, sorbent concentration, Sb(III) ion concentration, and temperature were also studied systemically. The equilibrium data were applied to the Langmuir and Freundlich isotherm models. The maximum adsorption capacity at pH 5 was determined to be 44.8 and 88.9 mg g−1 for RPMC and CTS‐mPMC sorbents, respectively. The D–R model results confirmed that the adsorption process was taken place dominantly through metal complex formation or chemical ion exchange. The reusability test indicated that the prepared CTS‐mPMC sorbent showed a good adsorption‐desorption stability even after 10 cycles. The kinetic results showed that the Sb(III) adsorption mechanism was well described by pseudo‐second‐order kinetic model. The thermodynamic parameters indicated that the adsorption process had exothermic character in nature and was more feasible with decreasing temperature. Based on all results it can be concluded that the prepared CTS‐mPMC can be considered as a promising sorbent for the elimination of Sb(III) ions from wastewaters. © 2017 American Institute of Chemical Engineers Environ Prog, 36: 1587–1596, 2017

show abstract

Application of termite nest for adsorption of Cr(VI)

Cited by 26 publications

References 29 publications

Valorization of raw biomaterial waste-date stones-for Cr (VI) adsorption in aqueous solution: Thermodynamics, kinetics and regeneration studies

Valorization of raw biomaterial waste-date stones-for Cr (VI) adsorption in aqueous solution: Thermodynamics, kinetics and regeneration studies

Validity of Egyptian Na‐montmorillonite for adsorption of Pb²⁺, Cd²⁺ and Ni²⁺ under acidic conditions: characterization, isotherm, kinetics, thermodynamics and application study

Application of chitosan‐modified pumice for antimony adsorption from aqueous solution

Contact Info

Product

Resources

About

Application of termite nest for adsorption of Cr(VI)

Cited by 26 publications

References 29 publications

Valorization of raw biomaterial waste-date stones-for Cr (VI) adsorption in aqueous solution: Thermodynamics, kinetics and regeneration studies

Valorization of raw biomaterial waste-date stones-for Cr (VI) adsorption in aqueous solution: Thermodynamics, kinetics and regeneration studies

Validity of Egyptian Na‐montmorillonite for adsorption of Pb2+, Cd2+ and Ni2+ under acidic conditions: characterization, isotherm, kinetics, thermodynamics and application study

Application of chitosan‐modified pumice for antimony adsorption from aqueous solution

Contact Info

Product

Resources

About

Validity of Egyptian Na‐montmorillonite for adsorption of Pb²⁺, Cd²⁺ and Ni²⁺ under acidic conditions: characterization, isotherm, kinetics, thermodynamics and application study