Efficient adsorption of lead (II) and copper (II) from aqueous phase using oxidized multiwalled carbon nanotubes/polypyrrole composite

Nyairo, Wilfrida Nyanduko; Eker, Yasin Ramazan; Kowenje, Chrispin O.; Akın, İlker; Bingöl, Haluk; Tor, Ali; David, Oluwole Moses

doi:10.1080/01496395.2018.1424203

Cited by 64 publications

(19 citation statements)

References 44 publications

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“…As it is evident from the figure, by increasing pH from 2 to 6, the lead and arsenic ions adsorption efficiency values rose from 61.70% to 97.54% and from 60.81% to 96.18%, respectively. Such trends have been reported previously . These increases are due to the presence of negative charges on the adsorbent surface, which can be considered as the proper locations for the adsorption of metal ion.…”

Section: Resultssupporting

confidence: 83%

“…By their entrance into the food chain, heavy metal ions can cause significant human health risks . One of the highly toxic constituents of industrial sewages emitted from industries such as manufacturing batteries, paints, pigments, cables, steel, alloys, petroleum industries, and plastic manufacturing plants is lead . Different effects of this chemical on human′s nervous system, kidneys, and reproductive system, especially in children have been reported…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of Lead and Arsenic Ions from Aqueous Solution by Activated Carbon Prepared from Tamarix Leaves

Koohzad¹,

Jafari

Esmaeili

2019

ChemistrySelect

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Lead and arsenic are regarded as the significant heavy metal ions which have a great contribution in the pollution of industrial wastewaters. In this research, the adsorption of Pb (II) and As (III) ions from the aqueous solution was studied using activated carbon prepared from Tamarix leaves as a new adsorbent. The adsorbent was characterized by Brunauer, Emmett, and Teller (BET), X‐ray fluorescence spectrometer (XRF), scanning electron microscope (SEM), energy dispersive X‐ray and mapping (EDX/Map), X‐ray diffraction (XRD), and Raman techniques. Batch experiments were designed to investigate the significance of adsorption parameters including pH, adsorbent dosage, time, temperature, and initial concentration on Pb and As ions removal efficiencies. The experiments indicated that the highest adsorption efficiencies were 97.86% for lead and 96.18% for arsenic ions in pH values of 6 for Pb and 7 for As, adsorbent dosage of 3 g/L and initial concentration of 10 mg/L for both of them, and contact time of 60 min and 40 min for Pb and As ions, respectively. Additionally, the results of adsorption kinetics showed that the pseudo second‐order model was more effective for the description of adsorption mechanism of both metals compared to the pseudo first‐order model. The equilibrium behavior of arsenic and lead ions were described well by Langmuir and Freundlich models, respectively. In addition, thermodynamic studies showed that the current adsorption processes were exothermic and spontaneous. Based on the results, the prepared adsorbent can be considered as a good adsorbent for the removal of Pb and As ions from aqueous solutions.

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Section: Resultssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Adsorption of Lead and Arsenic Ions from Aqueous Solution by Activated Carbon Prepared from Tamarix Leaves

Koohzad¹,

Jafari

Esmaeili

2019

ChemistrySelect

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“…The ATN removal efficiency (E, %) and adsorption capacities (q, mg g −1 ) of MWCNTs and M-MWCNTs were determined based on the following equations [23]:…”

Section: Measurements and Data Analyzingmentioning

confidence: 99%

Atenolol adsorption onto multi-walled carbon nanotubes modified by NaOCl and ultrasonic treatment; kinetic, isotherm, thermodynamic, and artificial neural network modeling

Dehdashti

Amin

Gholizadeh

et al. 2019

J Environ Health Sci Engineer

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The removal of pharmaceutical pollutants from the aqueous environment is a great environmental concern, mainly due to their diversity, high consumption, and sustainability. In the current study, we aimed to investigate the ability of multi-walled carbon nanotubes (MWCNTs) modified by sodium hypochlorite (NaOCl) and ultrasonic treatment in refining wastewaters contaminated with Atenolol β-blocker drug (ATN). The physical and structural characteristics of the raw MWCNTs and modified MWCNTs (M-MWCNTs) were analyzed using SEM, TEM, Raman spectroscopy, TGA, and FT-IR techniques. The effects of different parameters, including pH, initial concentration, contact time, and temperature were studied and optimized. Subsequently, the adsorption data were analyzed by several kinetic and equilibrium isotherm equations and modeled by artificial neural network (ANN). Highest ATN removal (87.89%) ((q e,exp = 46.03 mg g −1)) occurred on the adsorbent activated within 10 s of ultrasonication time and NaOCl 30%. Moreover, adsorbent modification significantly improved the ATN removal, so that the removal rate on the raw MWCNTs was about 58%, but in the same conditions, M-MWCNTs removed more than 92% of the adsorbate. The adsorption process reached equilibrium after 90 min under the optimized pH of 6. According to ANN modeling, approximately the whole values dispersed around the 45°line, indicating a good compatibility between the trial results and ANNpredicted data. The modification of MWCNTs in proper ultrasonic power via appropriate concentration of NaOCl solution removed many of the impurities and significantly improved the adsorption performance of MWCNTs.

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“…Polypyrrole powder [29] and polypyrrole-based composites composed of different materials, such as carbon nanotubes [30,31], chitosan [19], and bentonite [20], have recently been employed for the removal of heavy metal ions from aqueous solutions. In addition, the decolorizing efficiency of polypyrrole-coated sawdust has been investigated, with remarkable results [32].…”

Section: Introductionmentioning

confidence: 99%

Efficient Adsorption of Lead (II) from Aqueous Phase Solutions Using Polypyrrole-Based Activated Carbon

et al. 2019

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In this study, polypyrrole-based activated carbon was prepared by the carbonization of polypyrrole at 650 °C for 2 h in the presence of four-times the mass of KOH as a chemical activator. The structural and morphological properties of the product (polypyrrole-based activated carbon (PPyAC4)), analyzed by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and thermogravimetric analysis, support its applicability as an adsorbent. The adsorption characteristics of PPyAC4 were examined through the adsorption of lead ions from aqueous solutions. The influence of various factors, including initial ion concentration, pH, contact time, and adsorbent dose, on the adsorption of Pb2+ was investigated to identify the optimum adsorption conditions. The experimental data fit well to the pseudo-second-order kinetic model (R2 = 0.9997) and the Freundlich isotherm equation (R2 = 0.9950), suggesting a chemisorption pathway. The adsorption capacity was found to increase with increases in time and initial concentration, while it decreased with an increase in adsorbent dose. Additionally, the highest adsorption was attained at pH 5.5. The calculated maximum capacity, qm, determined from the Langmuir model was 50 mg/g.

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Efficient adsorption of lead (II) and copper (II) from aqueous phase using oxidized multiwalled carbon nanotubes/polypyrrole composite

Cited by 64 publications

References 44 publications

Adsorption of Lead and Arsenic Ions from Aqueous Solution by Activated Carbon Prepared from Tamarix Leaves

Adsorption of Lead and Arsenic Ions from Aqueous Solution by Activated Carbon Prepared from Tamarix Leaves

Atenolol adsorption onto multi-walled carbon nanotubes modified by NaOCl and ultrasonic treatment; kinetic, isotherm, thermodynamic, and artificial neural network modeling

Efficient Adsorption of Lead (II) from Aqueous Phase Solutions Using Polypyrrole-Based Activated Carbon

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