Synthesis and characterization of arginine-doped polyaniline/walnut shell hybrid composite with superior clean-up ability for chromium (VI) from aqueous media: Equilibrium, reusability and process optimization

Hsini, Abdelghani; Naciri, Yassine; Laabd, Mohamed; Ouardi, Mahmoud El; Ajmal, Zeeshan; Lakhmiri, Rajae; Boukherroub, Rabah; Albourine, Abdallah

doi:10.1016/j.molliq.2020.113832

Cited by 112 publications

(39 citation statements)

References 76 publications

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“…Quantification and mass balance were also made the same way. Adsorption isotherms data were fitted using Freundlich [50] Langmuir [47], and the Langmuir-Freundlich [51,52] adsorption models. The Freundlich model does not have a mechanistic interpretation; it only represents an empirical approach to predict the species distribution between a solid/solution phase, and described by:…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Sulfate Kinetics and Adsorption Studies on a Zeolite/Polyammonium Cation Composite for Environmental Remediation

et al. 2021

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Sulfide mineral mining produces highly sulfate-contaminated wastewater which needs to be treated before disposal. A composite material was made from natural zeolite (NZ) and Superfloc® SC-581, a polyammonium cationic polymer. The resulting modified zeolite (MZ) demonstrated improved capacity for sulfate abatement from wastewater compared to NZ. Above pH 4.0, MZ retained positive surface charge while NZ remained negative. The effect of the ionic strength on the adsorption process was evaluated. Sulfate adsorption capacity was assessed and revealed MZ to be superior to NZ in all cases. Adsorption kinetics reached equilibrium after 10–12 h, with MZ adsorption being twice that of NZ; data fitted a pseudo-second order kinetic model. Adsorption isotherms reflected the high capacity of MZ for sulfate adsorption with maximum of 3.1 mg g−1, while NZ only achieved 1.5 mg g−1. The process corresponds to heterogeneous partially reversible adsorption of ionic species over the solid adsorbent. Langmuir–Freundlich parameters revealed that adsorption over MZ corresponds to an interaction eight times stronger than that on NZ. The sulfate adsorption pattern changes with ionic strength. Taken together, the composite formed between natural zeolite and polyammonium represents an adsorbent that maintains the adsorption capacity of zeolite and proves suitable for anionic species removal. Further prospect considers the testing of the composite with other anionic pollutants (arsenate, phosphate, perchlorate, etc.)

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Section: Adsorption Isothermsmentioning

confidence: 99%

Sulfate Kinetics and Adsorption Studies on a Zeolite/Polyammonium Cation Composite for Environmental Remediation

et al. 2021

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“…), lignocellulosic shells of almond, apricot, walnut, coconut, hazelnut, have been utilized as the filling material in various types of polymeric composites 1–7 . They have also been used as adsorbents in the form of hybrid composites with conducting polymers for wastewater treatment 8,9 . The widespread utilization of bio‐degradable polymers may contribute to create an eco‐friendly environment 10 .…”

Section: Introductionmentioning

confidence: 99%

Application of various carboxylic acids modified walnut shell waste as natural filler for epoxy‐based composites

Albaker

Kocaman

Martı

et al. 2021

J of Applied Polymer Sci

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In this study, chemically modified walnut shells (WS) were used as the filling material for synthesis of bio‐based epoxy composites and added to the matrix at varied mass ratios (10%–50%). The shells were initially treated with alkali and then modified with three different organic acids (citric acid [CA], oxalic acid [OA], and formic acid [FA]). The WS were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy (SEM)/energy‐dispersive X‐ray spectroscopy (EDX) and thermo gravimetric analyzer. The SEM and X‐ray diffraction were employed to observe the morphology of the composites. The influences of acid type and WS percentages on the mechanical, thermal and water sorption properties were investigated. The maximum tensile strength (124.8 MPa) was obtained with CA‐treated shells (CA‐WS) and followed by OA‐treated shells (OA‐WS) (117 MPa) and FA‐treated shells (FA‐WS) (96.5 MPa). Acid modification had a positive effect on Young's modulus as that of epoxy resins increased by 5.45%–50.91%. The treatment did not significantly affect hardness. The optimum amount of modified shells in the composites was found to be 20 wt%. Water sorption values changed in the range of 2.78%–3.42% for composites with 20 wt% WS and observed to increase with the filler amount in the composite. However, this trend and the slight decrease in thermal properties are not critical obstacles for the use of modified WS in the manufacture of inexpensive epoxy‐ and bio‐based eco‐friendly products.

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“…Considering both electrochemical performance and cost of production, energy storage materials based on polyaniline/reduced graphite oxide (PANI/rGO) composites are worthwhile to study 11 . PANI is cost‐effective, easy to synthesize, thermally stable, and owns high pseudocapacitance due to its unique multiple redox states 12–14 . However, PANI suffers from low power density and bad cycle stability, due to the typical drawbacks of faradic materials.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical performance of polydopamine modified PANI/rGO composites: Dependency on preparation sequence

Zhao

Pionteck

2021

J of Applied Polymer Sci

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Compounding polyaniline (PANI) and reduced graphite oxide (rGO) is a fascinating cost‐effective way to combine the high energy density of faradic material and high power density of carbonaceous material. In this study, in‐situ polymerization of dopamine was used to reduce graphite oxide and to modify the rGO product with polydopamine (PDA) simultaneously. This modification prevented restacking of rGO, and enhanced the interactions between PANI and rGO. The partial reduction of GO during the polymerization of dopamine was proven by X‐ray diffraction, Fourier transform infrared attenuated total reflectance, and UV–vis spectroscopy. Surprisingly, the electrochemical performance of the composites depends strongly on the preparation sequence. PANI/(rGO‐PDA) composites obtained by the synthesis of PANI in the presence of rGO‐PDA show better electrochemical performance than (PANI/rGO)‐PDA composites, which were produced by polymerizing dopamine in the presence of PANI/GO composite. At a given scan rate of 20 mV s−1, the highest specific capacity of PANI/(rGO‐PDA) composites was 230.7 F g−1, which was higher than those of all (PANI/rGO)‐PDA composites. This phenomenon is tightly related to the differences in morphologies, conductivities and specific surface areas of the two types of composites.

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Synthesis and characterization of arginine-doped polyaniline/walnut shell hybrid composite with superior clean-up ability for chromium (VI) from aqueous media: Equilibrium, reusability and process optimization

Cited by 112 publications

References 76 publications

Sulfate Kinetics and Adsorption Studies on a Zeolite/Polyammonium Cation Composite for Environmental Remediation

Sulfate Kinetics and Adsorption Studies on a Zeolite/Polyammonium Cation Composite for Environmental Remediation

Application of various carboxylic acids modified walnut shell waste as natural filler for epoxy‐based composites

Electrochemical performance of polydopamine modified PANI/rGO composites: Dependency on preparation sequence

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