Removing low levels of Cd(II) and Pb(II) by adsorption on two types of oxidized multiwalled carbon nanotubes

Šolić, Marko; Maletić, Snežana; Isakovski, Marijana Kragulj; Nikić, Jasmina; Watson, Malcolm; Rončević, Srđan

doi:10.1016/j.jece.2021.105402

Cited by 46 publications

(7 citation statements)

References 52 publications

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“…Thus, ox-MWCNTs functionalized for 6 h showed the maximum adsorption capacity of 13.5 mg g −1 for Cd( ii ). 79 In another study, MWCNTs used as an adsorbent demonstrated an impressive adsorption capacity of 181.81 mg g −1 for the removal of Cd( ii ) ions. 80 Alsaadi and team synthesized novel adsorbents for the removal of As 3+ from water.…”

Section: Carbon-based Adsorbentsmentioning

confidence: 97%

Comprehensive assessment of carbon-, biomaterial- and inorganic-based adsorbents for the removal of the most hazardous heavy metal ions from wastewater

Sheraz,

Shah,

Haleem

et al. 2024

RSC Adv.

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Section: Carbon-based Adsorbentsmentioning

confidence: 97%

Comprehensive assessment of carbon-, biomaterial- and inorganic-based adsorbents for the removal of the most hazardous heavy metal ions from wastewater

Sheraz,

Shah,

Haleem

et al. 2024

RSC Adv.

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“…Among many models, the Langmuir and the Freundlich adsorption isotherm models are very popular. The Langmuir isotherm assumes that the sorption sites are identical and energetically equivalent, and hence, homogeneous sorption occurs with no interactions among adsorbed species (Foo and Hameed, 2010;Reddy et al, 2012;Watson and Zoltan, 2021). The Langmuir isotherm model, presented in Equation (1), can be used to determine the adsorption capacity of an adsorbate (Krishni et al, 2014;Priyantha et al, 2018).…”

Section: Investigation Of CD 2+ Removal Under Dynamic Conditionsmentioning

confidence: 99%

Biosorption of Cd 2+ ions onto peel of Artocarpus nobilis Fruit: intra-particle diffusion and isotherm studies

Kotabewatta,

Priyantha

2024

Preprint

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The metal Cd, a toxic heavy metal, has a tendency to accumulate through food chains, causing health problems to various organisms; its removal from contaminated water systems is thus needed to safeguard the biosphere. Characterization experiments on the fruit peel of Artocarpus nobilis, an endemic plant to Sri Lanka, reveal that the surface of the biosorbent is negative, and that organic functional groups such as carboxylic acids, its derivatives and phenolic compounds present in the biosorbent undergo deprotonation showing strong affinity toward positively charged Cd2+ ions in aqueous medium. Systematic investigation conducted on the biosorbent shows its effectiveness as a biosorbent for Cd2+, leading to an excellent removal of 88% in batch experiments under optimized conditions of 150 min shaking time, 15 min settling time, 5.5–7.0 pH range at 150 rpm rotation speed. The extent of removal of Cd2+ is independent of both the heating time and heating temperature. Fitting of equilibrium biosorption data on linearized Langmuir and Freundlich adsorption isotherm models leads to the regression coefficients of 0.976 and 0.896, respectively, and the biosorption capacity based on the former model is 1.37×104 mg kg−1. Moreover, dynamic adsorption models are also successfully fitted to the Cd2+ removal data taken under dynamic conditions. The effect of boundary layer thickness explained by the intra-particle diffusion model could be considered in extending the removal of Cd2+ at large-scale.

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“…As illustrated in the figure, the minimum removal of Pb(II) and Cd(II) was 10.27 and 0.36% at pH 2, respectively. And the results can be explained as follows: when the pH value is less than 3.1, which is the zeta potential of O-MWCNTS [34], a substantial amount of H + is easier to occupy the adsorption sites of O-MWCNTS than metal ions Pb(II)/Cd(II). The adsorption removal of metal ions Pb(II)/Cd(II) rises to 90.15 and 31.47% with the increase in pH from 3 to 6.…”

Section: Phmentioning

confidence: 99%

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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Removing low levels of Cd(II) and Pb(II) by adsorption on two types of oxidized multiwalled carbon nanotubes

Cited by 46 publications

References 52 publications

Comprehensive assessment of carbon-, biomaterial- and inorganic-based adsorbents for the removal of the most hazardous heavy metal ions from wastewater

Comprehensive assessment of carbon-, biomaterial- and inorganic-based adsorbents for the removal of the most hazardous heavy metal ions from wastewater

Biosorption of Cd 2+ ions onto peel of Artocarpus nobilis Fruit: intra-particle diffusion and isotherm studies

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

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