Competitive adsorption of Hg2+, Pb2+ and Co2+ ions on polyacrylamide/attapulgite

Zhou, Shouyong; Xue, Ailian; Zhao, Yijiang; Wang, Qiwei; Chen, Yan; Li, Meisheng; Xing, Weihong

doi:10.1016/j.desal.2010.11.055

Cited by 70 publications

(24 citation statements)

References 44 publications

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“…There-aer no further increase in adsorption is seen which occurs due to fact that when all the adsorbent sites are occupied a dynamic equilibrium is attained in which the number of molecules being adsorbed equals the number of adsorbate molecules being desorbed. 37,38 Effect of initial concentration. Initial concentration of the adsorbate molecules affects the rate of adsorption to a great extent as depicted in Fig.…”

Section: Thermal Analysismentioning

confidence: 99%

Removal of Pb(ii) and Cd(ii) from wastewater using arginine cross-linked chitosan–carboxymethyl cellulose beads as green adsorbent

et al. 2019

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Section: Thermal Analysismentioning

confidence: 99%

Removal of Pb(ii) and Cd(ii) from wastewater using arginine cross-linked chitosan–carboxymethyl cellulose beads as green adsorbent

et al. 2019

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“…It is one of the most suitable clay structures characterised by a high content of reactive OH groups on its surface, that are quite accessible to grafting reactants. Previous works on the applications of modified attapulgite include the sorption of reactive dyes at a 3‐aminopropyltriethoxysilane grafted attapulgite , the uptake of uranyl cations at N‐propyldiethylenetrimethoxysilane and bis[3‐(triethoxysilyl)propyl]tetrasulfide grafted attapulgite , the competitive adsorption of Hg 2+ , Pb 2+ and Co 2+ at polyacrylamide/attapulgite , Pb 2+ adsorption at N‐methylimidazole grafted attapulgite , or Cu 2+ , Hg 2+ , Zn 2+ and Cd 2+ at hyperbranched aliphatic polyester grafted attapulgite .…”

Section: Introductionmentioning

confidence: 99%

Electroanalytical Application of Amine‐grafted Attapulgite to the Sensitive Quantification of the Bioactive Compound Mangiferin

et al. 2016

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A glassy carbon electrode (GCE) coated with a thin film of organoattapulgite was used for the voltammetric detection and quantification of mangiferin (MG), a bioactive xanthone with several therapeutic properties. The used modified attapulgite was prepared by surface grafting of [3‐(2‐aminoethylamino)propyl]trimethoxysilane. The grafted clay was characterised by SEM, CHN elemental analysis, FTIR spectroscopy and XRD techniques. The electrochemical behaviour of MG was first investigated on bare GCE by cyclic voltammetry which showed a single irreversible oxidation peak at ca 0.770 V (vs Ag/AgCl) in HCl/KCl buffer at pH 1. When the GCE was covered by the organoattapulgite, the electrode response for MG increased significantly due to favourable electrostatic interactions between MG and the protonated organoclay. A sensitive voltammetric method for the determination of MG, based on adsorptive stripping voltammetry was then developed. A linear variation of MG concentration with peak current was obtained in the range from 0.61 to 10.57 μM, with a detection limit of 2.75×10−7 M (S/N=3). Kinetic and chronocoulometric studies were also performed to characterise the diffusion of MG at the organoclay modified electrode. The interfering effect of some compounds likely to affect the stripping signal of MG was also evaluated, followed by the application of the developed method to a real biological sample.

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“…However, in the systems with lead(II) ions with concentrations of 10 or 100 ppm, a slight increase in their adsorption in the presence of CT PAM was observed. The free electron pairs located on the nitrogen atoms of PAM amide groups were probably involved in this adsorption increase due to the creation of covalent bonds between the amide groups and lead(II) ions [6,7]. This indicates that despite the electrostatic repulsion between the positively charged ionized groups of polymer and the Pb(II) cations, these heavy metals can be captured from the solution and the accumulation phenomenon can occur.…”

Section: Resultsmentioning

confidence: 99%

Studies of the Cationic Polyacrylamide Adsorption on the Montmorillonite Surface in the Presence of Lead(II) Ions

Wiśniewska

Szewczuk-Karpisz

2019

Innovations-Sustainability-Modernity-Openness Conference (ISMO’19)

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The phenomena of stabilization and flocculation through the addition of polymer is widely used in many branches of industry, e.g., agriculture. Due to the high strength of intermolecular bonding, the polymers are used as an additive to control the process of soil erosion. Flocculants strengthen the soil cohesion, which limits the transport of sediments and thus the process of soil structure degradation. Also, the presence of polymers affects the increase of water infiltration into the soil and dissolved substances, including toxic compounds. Therefore, the presence of soil flocculants may influence the occurrence of heavy metal accumulation. The aim of the study was to investigate the influence of the presence of cationic polyacrylamide on lead(II) ion adsorption onto the surface of montmorillonite. The effect of cationic group content in the polymeric macromolecules, the addition order of individual adsorbates, and the lead(II) ion concentration were also determined.

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Competitive adsorption of Hg2+, Pb2+ and Co2+ ions on polyacrylamide/attapulgite

Cited by 70 publications

References 44 publications

Removal of Pb(ii) and Cd(ii) from wastewater using arginine cross-linked chitosan–carboxymethyl cellulose beads as green adsorbent

Removal of Pb(ii) and Cd(ii) from wastewater using arginine cross-linked chitosan–carboxymethyl cellulose beads as green adsorbent

Electroanalytical Application of Amine‐grafted Attapulgite to the Sensitive Quantification of the Bioactive Compound Mangiferin

Studies of the Cationic Polyacrylamide Adsorption on the Montmorillonite Surface in the Presence of Lead(II) Ions

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