Adsorption of Pb(II) by N-methylimidazole modified palygorskite

Chang, Yaoguang; Liu, Hongwei; Zha, Fei; Chen, Hukui; Ren, Xiaoning; Lei, Ziqiang

doi:10.1016/j.cej.2010.10.081

Cited by 50 publications

(12 citation statements)

References 53 publications

(54 reference statements)

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“…The essential characteristic of the Langmuir equation can be expressed in terms of a dimensionless constant separation factor (R L ) (Chang et al 2011), which is defined in Eq. (4):…”

Section: Discussionmentioning

confidence: 99%

Removal of lead from aqueous solutions by a poly(acrylic acid)/bentonite nanocomposite

2014

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We synthesized a novel poly acrylic acid-organobentonite (PAA-Bent) nanocomposite by successive intercalation of cetyltrimethylammonium (CTA) surfactant and polyacrylic acid (PAA) into the bentonite (Bent) interlayer spaces. The surfactant-modified clay (CTABent) and PAA-Bent nanocomposite were characterized by XRD and FT-IR techniques and used for removal of Pb(II) from aqueous solution. The XRD results confirmed the intercalation of CTA and PAA into the interlayer spaces of the bentonite increasing the d 001 spacing of the clay from 12.2 up to 38.9 Å . FT-IR analysis of the modified clay samples revealed the functional groups of CTA and PAA constituents alighted on the bentonite surfaces. Maximum Pb sorption capacity of the Bent and PAA-Bent predicted by Langmuir model were 52.3 and 93.0 mg g -1 , respectively, showing that the synthesized nanocomposite superiorly adsorbed Pb from the solution as compared to the Bent. The maximum Pb removal efficiency of 99.6 % was achieved by the nanocomposite at 25°C with \30 min contact time for a 7.5 g L -1 solid-to-liquid ratio and an initial metal concentration of 400 mg L -1 . The results indicated that PAA-Bent nanocomposite can be efficiently used as a superadsorbent for the removal of Pb(II) from aqueous solution.

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“…The essential characteristic of the Langmuir equation can be expressed in terms of a dimensionless constant separation factor (R L ) (Chang et al 2011), which is defined in Eq. (4):…”

Section: Discussionmentioning

confidence: 99%

Removal of lead from aqueous solutions by a poly(acrylic acid)/bentonite nanocomposite

2014

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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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“…The hybrid sorbent had also a higher affinity toward Pb ions as estimated from the greater K L value calculated for PAA-Bent compared to Bent. The R L values at different temperatures were all below 1.0 (Table 4), which means the adsorption is favorable [16]. Moreover, R L values decrease with increasing temperatures, demonstrating that the ongoing adsorption process is much more favorable at higher temperatures.…”

Section: Effect Of Temperature On Pb Sorption Efficiencymentioning

confidence: 79%

“…To date, different types of natural and synthetic sorbents including clay minerals (e.g. bentonite, palygorskite, and kaolinite) [9][10][11], multi-walled carbon nanotubes [12], mercapto-functionalized sepiolite [13], zeolitenanoscale zero-valent iron composite [14], 8-hydroxy quinoline-immobilized bentonite [15], N-methylimidazole-modified palygorskite [16], as well as various biosorbents [17,18], and polymers [19][20][21] have been used for removing of metals from aqueous solutions.…”

Section: Desalination and Water Treatmentmentioning

confidence: 99%

See 1 more Smart Citation

Kinetics and thermodynamics of Pb sorption onto bentonite and poly(acrylic acid)/bentonite hybrid sorbent

Rafiei

Shirvani

Ogunseitan

2016

Desalination and Water Treatment

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Adsorption of Pb(II) by N-methylimidazole modified palygorskite

Cited by 50 publications

References 53 publications

Removal of lead from aqueous solutions by a poly(acrylic acid)/bentonite nanocomposite

Removal of lead from aqueous solutions by a poly(acrylic acid)/bentonite nanocomposite

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

Kinetics and thermodynamics of Pb sorption onto bentonite and poly(acrylic acid)/bentonite hybrid sorbent

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