Efficient treatment of lead-containing wastewater by hydroxyapatite/chitosan nanostructures

Mohammad, Ahmad M.; El-Din, Taher A. Salah; Hassan, Mohamed A.; El‐Anadouli, Bahgat E.

doi:10.1016/j.arabjc.2014.12.016

Cited by 84 publications

(30 citation statements)

References 29 publications

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“…To overcome the well-known limitations of Langmuir model and take into account the central role of surface heterogeneity on a complex surface as hydroxyapatite, other model adsorption isotherms have been explored. Freundlich isotherm equation is an alternative model commonly applied in modeling the adsorption processes on heterogenous surfaces (Anoop Krishnan et al 2011;Benzaoui et al 2018;Mohammad et al 2017;Zhu et al 2008). Specifically, Freundlich isotherm postulates an exponential distribution of the adsorption sites energy.…”

Section: Single Metal Adsorption Isothermsmentioning

confidence: 99%

Nickel and cobalt adsorption on hydroxyapatite: a study for the de-metalation of electronic industrial wastewaters

2019

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In the present study, the Ni(II) and Co(II) adsorption efficiency and selectivity, as well adsorption mechanisms on a stoichiometric hydroxyapatite (HAP) surface have been investigated. Characterization studies (N2 adsorption/desorption and X-ray powder diffraction (XRPD) analyses) and adsorption tests under various operative conditions provided detailed information about the use of HAP in the de-metalation of wastewaters containing Ni and Co as polluted metal species. The sorption capacity of HAP has been evaluated by static batch adsorption tests varying initial concentration of Ni(II) and Co(II) species (from ca. 0.25 to 4.3 mM), contact time (from 15 min to 24 h), and pH (from 4 and 9) operative parameters. Proposed mechanisms of adsorption of Ni(II) and Co(II) on HAP surface are ion-exchange and surface complexation; a partial contribution of chemical precipitation from bulk solution should be considered at pH 9. In addition, adsorption isotherms of Ni(II) and Co(II) on HAP have been collected at 30°C and pH 4 and modeled by employing different equations. The maximum sorption capacities have been quantified as 0.317 mmol g-1 HAP (18.6 mg g-1 HAP) and 0.382 mmol g-1 HAP (22.5 mg g-1 HAP) for Ni(II) and Co(II), respectively. Selectivity to Co and Ni in the adsorption process on HAP has also been investigated; HAP has higher affinity towards Co than Ni species (Co:Ni=2.5:1, molar ratio).

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Section: Single Metal Adsorption Isothermsmentioning

confidence: 99%

Nickel and cobalt adsorption on hydroxyapatite: a study for the de-metalation of electronic industrial wastewaters

2019

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“…8).The data shows that as the initial concentration increase the removal efficiency decrease from 98 % to 25 % and this attributed to lacking sufficient active sites for adsorption [25]. On the opposite wise, the uptake increase from 4 mg/g to 55 mg/g with increasing concentration and this may be due to that the ratio between sorbent and sorbate is sufficient to providing a driving force to overcome the mass transfer resistance between them [26].…”

Section: 2effect Of Methylene Blue Concentration On Uptake Efficienmentioning

confidence: 94%

Methylene blue removal from wastewater using silica/corncob nanocomposite

Kamal

Attia

Ammar

et al. 2019

International Journal of Development

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Silica/corncob nanocomposite was prepared for remove of methylene blue. Fourier transform infrared (FTIR) spectrophotometry, X-ray diffraction (XRD), Scanning electron microscopy (SEM), dispersive energy x-ray spectrometer (EDX), High-resolution transmission electron microscopy (HR-TEM), and Zeta potential measurements were performed to reveal functionality, crystal structure, morphology, and point of zero charge of the synthesized sorbents. The effect of contact time, initial dye concentration, pH and sorbent dose were evaluated to study the removal efficiency and the adsorption capacity for silica/corncob nanocomposite. The equilibrium concentration of dye was measured by spectrophotometer. Adsorption isotherms and kinetics were also evaluated and reported. The removal efficiency of silica/corncob nanocomposite was (98%).

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“…As it is the case for the dye removal, the combination of CS with other compounds was in the scope of recent investigations: the hydroxyapatite/CS nanostructures were efficient concerning the removal of Pb 2+ from wastewater, revealing a higher adsorption capacity than comparable sorbents [64]. The same applies to CS-tannic acid modified biopolymers being able to adsorb Pb 2+ and Al 3+ [65].…”

Section: Remediation Of Heavy Metal Pollutants/contaminantsmentioning

confidence: 99%

Sewage Polluted Water Treatment via Chitosan: A Review

Hahn¹,

Zibek²

2018

Chitin-Chitosan - Myriad Functionalities in Science and Technology

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Due to the increasing scarcity of water, wastewater treatment and water conditioning are one of the major future issues. Together with the need to apply highly accessible abundant materials and the demand to replace fossil-based chemicals with sustainable compounds from renewable resources, chitosan (CS) provides some of the solutions to obtain these goals and combines both, abundance and sustainability. Hence, the focus of this review is on the application of CS in wastewater treatment providing advantages and drawbacks in using CS in contrast to chitin. We herewith present the application of CS for coagulation/flocculation purposes, whether as native compound, as functionalized molecule or as blend, respectively, composite. The heavy metal, respectively, dye removal is an additional theme to be addressed in the body of the text. The third topic of this review contains the application of CS blends or composites in order to prepare membrane materials for water purification or conditioning. Together with a summary of the recent study, we discuss these findings and possible consequences for future works. In addition, we provide some theoretical background of the processes that CS is involved in and state some mechanistic insights.

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Efficient treatment of lead-containing wastewater by hydroxyapatite/chitosan nanostructures

Cited by 84 publications

References 29 publications

Nickel and cobalt adsorption on hydroxyapatite: a study for the de-metalation of electronic industrial wastewaters

Nickel and cobalt adsorption on hydroxyapatite: a study for the de-metalation of electronic industrial wastewaters

Methylene blue removal from wastewater using silica/corncob nanocomposite

Sewage Polluted Water Treatment via Chitosan: A Review

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