Adsorption of aluminum and lead from wastewater by chitosan-tannic acid modified biopolymers: Isotherms, kinetics, thermodynamics and process mechanism

Badawi, Michaël; Negm, Nabel A.; Kana, Maram T.H. Abou; Hefni, Hassan H.H.; Moneem, M.M. Abdel

doi:10.1016/j.ijbiomac.2017.03.003

Cited by 144 publications

(53 citation statements)

References 61 publications

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“…The band located at 1729 cm −1 (carbonyl group) from TA was attenuated and displaced . All these changes indicate that the reaction between TA and chitosan involved formation of a chemical bond between the amino group of the chitosan and the hydroxyl group attached to the phenyl groups of TA molecules . However, the effect between the two may be weak; hence, the characterization of the infrared spectrum was not sufficiently clear.…”

Section: Resultsmentioning

confidence: 99%

Poly(acrylic acid)‐chitosan @ tannic acid double‐network self‐healing hydrogel based on ionic coordination

Zhang

et al. 2020

Polymers for Advanced Techs

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In this work, poly(acrylic) acid-chitosan @ tannic acid-aluminum ion (PAA-CS@TA-Al 3+ ) double-network hydrogel was prepared via prefabrication, blending method, and Al 3+ immersion method. The interaction between chitosan and tannic acid (CS@TA) was analyzed using Fourier transfer infrared spectra and UV-Vis spectra. The UV-Vis spectrum was also used to confirm the formation of ionic coordination in the gel. Then, the possible coordination modes were studied and analyzed. The microscopic pore structure and macroscopic strain behavior of the gel were analyzed using SEM and tensile testing, respectively, which verified that the tensile strength (≈32 KPa) and elongation at break (≈1700%) of the gel primarily resulted from its crosslinking structure. In addition, the gel also demonstrated a good self-healing performance with recovery ≈92.2% at 60 minutes.Hence, the proposed novel self-healing gel can provide inspiration for the preparation of future self-healing gels. K E Y W O R D Schitosan, double-network hydrogel, ionic coordination, self-healing, tannic acid

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Section: Resultsmentioning

confidence: 99%

Poly(acrylic acid)‐chitosan @ tannic acid double‐network self‐healing hydrogel based on ionic coordination

Zhang

et al. 2020

Polymers for Advanced Techs

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“…Moreover, new peaks are observed in SG-Al spectra after modification with Al, particularly those at 1445 cm −1 and 1546 cm −1 that have been associated with the presence of surface hydroxide groups (~AlOH) [28] or to Al-O bending. Furthermore, a shift on the absorption band at 1751 cm −1 corresponding to C=O group was observed ( Figure 3a), which has been attributed to the formation of coordination bonds between this group (O atoms) and the Al ions [29]. and arsenate sorption capacities.…”

Section: Biosorbent Characterizationmentioning

confidence: 97%

Removal of Fluoride and Arsenate from Aqueous Solutions by Aluminum-Modified Guava Seeds

Ramos-Vargas

Alfaro-Cuevas-Villanueva

Huirache–Acuña

et al. 2018

Applied Sciences

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Featured Application: The adsorbent materials under study could have a potential use for the decontamination of groundwater with high levels of arsenic and fluoride. It could be particularly suitable for application in water treatment for small communities.Abstract: The contamination of groundwater by arsenic and fluoride is a major problem worldwide, causing diseases in the population that uses these waters for their consumption. Therefore, the removal of these types of pollutants from groundwater is a very important issue. In this work, the removal of arsenate and fluoride from aqueous solutions by using aluminum-modified guava seeds (Al-GSs) was evaluated. Batch-type adsorption experiments were carried out with aqueous solutions of As(V) and F − and Al-GSs. The kinetic and equilibrium parameters of adsorption were determined, as well as the effects of adsorbent dose and pH. The adsorbent was characterized by scanning electron microscopy and infrared spectroscopy in order to determine its morphology and the functional groups present in the material. The results showed that hydroxyl and carboxyl are the main groups involved in the adsorption of As(V) and F − . The fluoride adsorption kinetics indicate that the equilibrium time was reached at 150 min and it can be described by the Lagergren model, while for As(V) the equilibrium time was lower (120 min) and the kinetic data were fitted well to the pseudo-second-order model. The Langmuir-Freundlich model can describe the adsorption equilibrium data in all cases. The fluoride adsorption capacity by Al-GS was 0.3445 mg/g, and for As(V) it was 4 mg/g. It can be established that the removal of arsenates and fluoride in Al-GSs is due to chemisorption on a heterogeneous surface.then consumption of these waters may lead to dental fluorosis. From 3 to 6 mg/L of fluoride, skeletal fluorosis may appear, and at higher fluoride levels (>10 mg/L) crippling skeletal fluorosis can be developed [3,4]; these types of fluorosis are irreversible, and no treatment can eliminate symptoms definitively. Keeping fluoride intake within safe levels is the only way to prevent these diseases [5,6]. People in several countries around the world are facing problems of high fluoride levels in drinking water; these problems are more severe and intense depending on different factors, like the geographical and economic status of the affected communities [7]. The World Health Organization (WHO) guidelines for drinking water quality have established that, for areas with a warm climate, fluoride concentration in water should remain below 1 mg/L, while this concentration could be raised up to 1.2 mg/ for areas with a cold climate [3]. In developing countries this problem is more acute, particularly in small urban communities and rural areas [5,8].On the other hand, arsenic content in drinking water is also a worldwide concern, and it represents a great threat to human health. Levels above 10 µg/L of arsenic, which is the maximum level recommended by the WHO, have been reported in drinking water from se...

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“…Langmuir and Freundlich isotherm models are widely used for investigating and representing adsorption processes and mechanisms [35]. The Langmuir model is based on a hypothesis that only one layer adsorbates are adsorbed at the adsorbent surface, where the adsorption potential is constant, and the Freundlich model is an empirical application suited to highly heterogeneous surfaces [36].…”

Section: Adsorption Isothermmentioning

confidence: 99%

Oyster Shell as a Low-Cost Adsorbent for Removing Heavy Metal Ions from Wastewater

Xu¹,

Liu²,

Oh³

et al. 2019

Pol. J. Environ. Stud.

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Adsorption of aluminum and lead from wastewater by chitosan-tannic acid modified biopolymers: Isotherms, kinetics, thermodynamics and process mechanism

Cited by 144 publications

References 61 publications

Poly(acrylic acid)‐chitosan @ tannic acid double‐network self‐healing hydrogel based on ionic coordination

Poly(acrylic acid)‐chitosan @ tannic acid double‐network self‐healing hydrogel based on ionic coordination

Removal of Fluoride and Arsenate from Aqueous Solutions by Aluminum-Modified Guava Seeds

Oyster Shell as a Low-Cost Adsorbent for Removing Heavy Metal Ions from Wastewater

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