Adsorption of Cr(VI) by NaOH-modified microporous activated carbons derived from the wastes of Amaranthus retroflexus, Magnolia soulangeana, and Tanacetum Vulgar L.: mechanism, isotherms, and kinetic studies

Beig, Sajad Ur Rehman; Shah, Shakeel A.

doi:10.1007/s11356-022-24616-y

Cited by 10 publications

(3 citation statements)

References 66 publications

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“…The removal rate decreased from 76.34% to 55.59% in the case of Pb(II) and from 29.83% to 16.68% in the case of Cd(II). Typically, the removal of both ions decreased with increasing initial concentration, which is attributed to the limited amount of adsorption sites for the adsorbent during the adsorption process [37]. The findings of this study suggest that Pb(II) undergoes easier adsorption onto O-MWCNT S in comparison to Cd(II).…”

Section: Initial Concentrationmentioning

confidence: 69%

Adsorption Kinetics and Mechanism of Pb(II) and Cd(II) Adsorption in Water through Oxidized Multiwalled Carbon Nanotubes

Li,

Cui,

et al. 2024

Applied Sciences

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Toxic heavy metals are ubiquitous in the aquatic environment and show a significant danger to human health. Carbon nanotubes have been extensively used in treating the contamination of groundwater due to their porous multi-layer nature. Batch tests revealed that oxidized multiwalled carbon nanotubes (O-MWCNTS) offer better removal of Pb(II). The removal rate of Pb(II) was 90.15% at pH 6 within 24 h, which was ~58% more than that of Cd(II). The removal rate decreased to 55.59% for Pb(II) and to 16.68% for Cd(II) when the initial concentration of Pb(II)/Cd(II) ranged from 5 to 15 mg·g−1. The removal rate in the competitive tests was about 60.46% for Pb(II) and 9.70% for Cd(II). The Langmuir model offered better description of the adsorptive data for both ions. And the Qm of Pb(II) was 5.73 mg·g−1, which was 2.39 mg·g−1 more than that of Cd(II) in a single-icon system, while Qm was 7.11 mg·g−1 with Pb(II) and 0.78 mg·g−1 with Cd(II) in competitive water. And thermodynamic tests further indicated that the activating energy of Pb(II) and Cd(II) was 83.68 and 172.88 kJ·mol−1, respectively. Lead and cadmium adsorbed on the surface of O-MWCNTS are antagonistic in the competitive system. Based on XPS analyses, it was concluded that the absorbed lead/cadmium species on O-MWCNTS were (-COO)2Pb, (-COO)Pb(-O)/(-COO)2Cd, and (-COO)Cd(-O). Additionally, they offered theoretical evidence supporting the practicality of using nanocomposite membranes as a means to remove cadmium and lead.

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Section: Initial Concentrationmentioning

confidence: 69%

Adsorption Kinetics and Mechanism of Pb(II) and Cd(II) Adsorption in Water through Oxidized Multiwalled Carbon Nanotubes

Li,

Cui,

et al. 2024

Applied Sciences

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“…Parameswari et al [2] found a maximum Cr removal efficiency of 83.94 % at 150 ppm Cr concentration. Beig and Shah [33] found that the experiment used a defined adsorbent concentration of 0.2 g L −1 , with specific active locations for adsorbing Cr(VI) ions from the aquatic environment.…”

Section: Initial Concentrationmentioning

confidence: 99%

Removal of Chromium from Aqueous Solution Using Ziziphus jujuba Seed‐Activated Biochar

Manthira Giri,

Parathasarathy

2024

Chem Eng & Technol

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The present study aims to remove chromium (Cr) from a synthetic solution using Ziziphus jujube seed (ZJS)‐activated biochar (ZJSAB) as an adsorbent. Physicochemical characterization was carried out to understand the properties of ZJSAB samples. Adsorption characteristics of ZJSAB were determined using batch experiments for various temperatures, pH, dosage, concentration, and duration. The study reveals ZJSAB has 93 % efficiency in the removal of Cr for an initial concentration of 60 mg L−1 at 30 °C and 2 pH with 0.6 g L−1 dosage and 120 min duration. Freundlich isotherm and pseudo‐second‐order models were best fit with maximum removal efficiency for ZJSAB. When 0.3 N hydrochloric acid was introduced to a desorption study, Cr desorption was 93.47 %. The study reveals that activated biochar from ZJS was efficient for Cr removal from aqueous solutions.

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“…To improve the adsorption capacity of such materials, these are synergistically associated with different crosslinkers, such as polymers, 27,28 zeolites, 29,30 molecular organic frameworks (MOFs), 31 covalent organic frameworks (COFs), clays, 32 and activated carbon. 33,34 Conducting polymer-based nanocomposites have attracted significant interest in recent years for their utilization in wastewater treatment. There are many reports on nanocomposites of conducting polymers that have been widely used for their adsorption properties with metals and metal-oxide nanoparticles as the composite material.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and application of a zinc oxide–pyrrole–thiophene nanocomposite as an efficient adsorbent for the removal of tetracycline

War

Chishti

2023

New J. Chem.

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Adsorption of Cr(VI) by NaOH-modified microporous activated carbons derived from the wastes of Amaranthus retroflexus, Magnolia soulangeana, and Tanacetum Vulgar L.: mechanism, isotherms, and kinetic studies

Cited by 10 publications

References 66 publications

Adsorption Kinetics and Mechanism of Pb(II) and Cd(II) Adsorption in Water through Oxidized Multiwalled Carbon Nanotubes

Adsorption Kinetics and Mechanism of Pb(II) and Cd(II) Adsorption in Water through Oxidized Multiwalled Carbon Nanotubes

Removal of Chromium from Aqueous Solution Using Ziziphus jujuba Seed‐Activated Biochar

Synthesis, characterization, and application of a zinc oxide–pyrrole–thiophene nanocomposite as an efficient adsorbent for the removal of tetracycline

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