Amine–modified polyacrylamide–bentonite composite for the adsorption of humic acid in aqueous solutions

Anirudhan, T.S.; Suchithra, P.S.; Rijith, S.

doi:10.1016/j.colsurfa.2008.05.022

Cited by 129 publications

(51 citation statements)

References 36 publications

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“…Comparing with the spectrum of Mt, new peaks are observed to emerge in that of BAL-Mt at 1427 cm −1 and 2575 cm −1 , providing evidence for the presence of aliphatic C H deformation or bending vibrations and the S H groups of BAL, respectively [18,29]. For the spectra of vermiculites, the O H vibration of the tetrahedral sheets and the asymmetry Si O stretching vibrations of the tetrahedral sheets are observed at 3414 cm −1 and 999 cm −1 , respectively [30,31]. The deformation and bending modes of the Si O occur at 730, 685 and 471 cm −1 [29].…”

Section: Ftir Spectramentioning

confidence: 83%

Comparative study of Hg(II) adsorption by thiol- and hydroxyl-containing bifunctional montmorillonite and vermiculite

Tran

Zhu

et al. 2015

Applied Surface Science

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Section: Ftir Spectramentioning

confidence: 83%

Comparative study of Hg(II) adsorption by thiol- and hydroxyl-containing bifunctional montmorillonite and vermiculite

Tran

Zhu

et al. 2015

Applied Surface Science

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“…Numerous investigations have been conducted to evaluate HA removal using various adsorbents. Some of these adsorbents include irradiationcrosslinked carboxymethylchitosan [8], aminopropyl functionalized SBA-15 [9], bifunctional resin JN-10 [10], acidactivated Greek bentonite [11], basic ion exchange resin [12], chitosan-coated granules [13], Mg/Fe-layered double hydroxide [14], amine-modified polyacrylamide-bentonite composite [15], crosslinked chitosan-epichlorohydrin beads [16], Mg/Al-layered double hydroxides [17], fly ash [18], chitosan hydrogel beads [19], layer-structured graphite oxide [20], unburned carbons [21], surfactantmodified bentonite [22], activated carbon [23], aminated polyacrylonitrile fiber [24], and the composite of chitosan and activated clay [25].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of humic acid from aqueous solution on bilayer hexadecyltrimethyl ammonium bromide-modified zeolite

Zhan

Lin

Qiu

et al. 2011

Front. Environ. Sci. Eng. China

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Surfactant-modified natural zeolites (SMNZ) with different coverage types were prepared by loading hexadecyltrimethyl ammonium bromide (HTAB) onto the surface of a natural zeolite. The adsorption behavior of humic acid (HA) on SMNZ was investigated. Results indicate that the adsorbent SMNZ exhibited a higher affinity toward HA than the natural zeolite. HA removal efficiency by SMNZ increased with HTAB loading. Coexisting Ca 2+ in solution favored HA adsorption onto SMNZ. Adsorption capacity decreased with an increasing solution pH. For typical SMNZ with bilayer HTAB coverage, HA adsorption process is well described by a pseudo-second-order kinetic model. The experimental isotherm data fitted well with the Langmuir model. Calculated maximum HA adsorption capacities for SMNZ with bilayer HTAB coverage at pH 5.5 and 7.5 were 63 and 41 mg$g -1 , respectively. E2/E3 (absorbance at 250 nm to that at 365 nm) and E4/E6 (absorbance at 465 nm to that at 665 nm) ratios of the residual HA in solution were lower than that of the original HA solution. This indicates that the HA fractions with high polar functional groups, low molecular weight (MW), and aromaticity had a stronger tendency for adsorption onto SMNZ with bilayer HTAB coverage. Results show that HTABmodified natural zeolite is a promising adsorbent for removal of HA from aqueous solution.

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“…3) is characterized by the presence of vibrations in the region of 2899 to 2128 cm -1 , related to stretching vibrations of -CH 3 , -CH 2 and -CH groups of aliphatic structures, the carboxyl group at 1695 cm -1 and the peaks with frequencies of 1527 and 1360 cm -1 , the vibrations of atoms of the carboxyl group in the Mod-Hum-Co. The FTIR spectra of the obtained samples confirm the formation of metal-humate complexes by binding the metal to donor atoms with coordinated covalent bonds for Mod-Hum-Cu by the 669, 406, 340 and 326 cm -1 peaks and for Mod-Hum-Co by the 606,469,419 and 341 cm -1 peaks which confirm the formation of M-O connection in the complexes [8]. Thus, based on the experimental data it can be argued that the interaction of ions of copper and cobalt with humic substances is predominantly due to adsorption.…”

Section: CMmentioning

confidence: 53%

Removability Efficiency of Heavy Metals with Modified Humate from Aqueous Media

Taubayeva¹,

Dzhusipbekov²,

Nurgalieva³

et al. 2014

Eur Chem Tech J

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The main aim of this work was to study the possibility of using amine-modified humate as a sorbent for the purification of water from heavy metal ions (Cu&Co). One of the effective methods of creating new sorbents of humic acids is chemical modification based on the high reactivity of the functional groups in the composition of humic acids. The possibility of modification of humic acid with bis(3-aminopropyl) amine was illustrated. Modification was carried out with the aim of increasing its sorption capacity. Metalhumate complexes were also obtained by an ion-exchange procedure with modified humate (Mod-Hum) by employing metal salts such as Cu(CH 3 COO) 2 ·H 2 O, Co(CH 3 COO) 2 ·4H 2 O. Maximum sorption percentages of Mod-Hum achieved were about 99.2% for Cu (II) and 90% for Co (II). The sorption degree depending on pH changes was studied in the range of 2 to 8, the sorption ability of the sorbents was stated to increase with the increase in pH. The degree of sorption of copper (ІІ) on Mod-Hum in the studied range of рН 5 was higher and of cobalt (II) for which the sorption is optimal at higher values (рН 7-8). It is stated that sorption degree increases with the increase in time from 15 min to 2 h. The adsorption of toxic metal ions with Mod-Hum was measured by atomic absorption spectroscopy (AAS). The experimental results on determination of the adsorption isotherm were evaluated with the Langmuir equation. It is shown that the sorbent develops a high sorption capacity in regard to ions of Cu (18.42 mg/g) and Со (16.25 mg/g). All the obtained complex compounds were analyzed and characterized by FT infrared spectroscopy (FTIR), scanning electron microscopy (SEM).

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Amine–modified polyacrylamide–bentonite composite for the adsorption of humic acid in aqueous solutions

Cited by 129 publications

References 36 publications

Comparative study of Hg(II) adsorption by thiol- and hydroxyl-containing bifunctional montmorillonite and vermiculite

Comparative study of Hg(II) adsorption by thiol- and hydroxyl-containing bifunctional montmorillonite and vermiculite

Adsorption of humic acid from aqueous solution on bilayer hexadecyltrimethyl ammonium bromide-modified zeolite

Removability Efficiency of Heavy Metals with Modified Humate from Aqueous Media

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