Humic acid adsorption onto Mg/Fe layered double hydroxide

Gasser, M.S.; Mohsen, H.T.; Aly, H. F.

doi:10.1016/j.colsurfa.2008.08.002

Cited by 85 publications

(25 citation statements)

References 18 publications

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“…1), which was in accordance with the ndings from previous studies. 27,36 Reusability of the calcined LDH The test for the reusability of the calcined LDH for removing Ni and HA was carried out by repeated sorption and calcination processes. The performance of the calcined LDH for removing Ni was found to be decreasing gradually aer four sorption and calcination cycles at pH 7, as given in Fig.…”

Section: Parameters Langmuir Ttingmentioning

confidence: 99%

Synergistic effect of humic and fulvic acids on Ni removal by the calcined Mg/Al layered double hydroxide

Fang

Chen

et al. 2015

RSC Adv.

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Discharge of Ni(II) containing wastewater to terrestrial environment can lead to serious pollution issues. This study presents a facile, cost-effective and highly efficient method to rapidly remove Ni(II) from wastewater using a calcined Mg/Al layered double hydroxide (LDH), which is a pioneering investigation of using the calcined LDH to remove the positively charged Ni(II) ions. The kinetic studies showed that the removal of Ni(II) was very rapid with a pseudo first order k of up to 3.6 AE 0.5 h À1 , and maximum removal of Ni(II) was up to 204.2 AE 10.6 mg g À1 . In addition, our results reveal that both humic (HA) and fulvic acids (FA) can strongly bind to the surface of the LDH, which demonstrates that the calcined LDH can effectively remove both cationic and anionic pollutants in a single process. With the increase of pH up to 7.5, the removal of Ni, HA and FA by the calcined LDH are all drastically enhanced. Our study also demonstrated a strong synergetic effect of FA and HA on the Ni(II) removal by the calcined LDH, with a maximum Ni(II) removal of 290.6 AE 16.4 mg g À1 and 480.4 AE 21.3 mg g À1 at pH 7, respectively. The possible mechanism of the Ni(II) removal can be due to the incorporation of Ni into the layered structure by replacing the

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Section: Parameters Langmuir Ttingmentioning

confidence: 99%

Synergistic effect of humic and fulvic acids on Ni removal by the calcined Mg/Al layered double hydroxide

Fang

Chen

et al. 2015

RSC Adv.

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“…Furthermore, the adsorption process can remove a large number of toxic substances from the treated water, and has no side effects or secondary pollution [6][7][8][9][10][11][12][13][14][15]. However, one process, granular activated carbon (GAC), is generally effective, but not cost effective, thus new adsorbents are being sought.…”

Section: Introductionmentioning

confidence: 99%

An innovative zinc oxide-coated zeolite adsorbent for removal of humic acid

Wang¹,

Cui²,

Nadagouda³

et al. 2016

Journal of Hazardous Materials

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Zinc oxide (ZnO)-coated zeolite adsorbents were developed by both nitric acid modification and Zn(NO3)2·6H2O functionalization of zeolite 4A. The developed adsorbents were used for the removal of humic acid (HA) from aqueous solutions. The synthesized materials were characterized by porosimetry analysis, scanning electron microscopy, X-Ray diffraction analysis, and high resolution transmission electron microscopy. The maximum adsorption capacity of the adsorbents at 21±1°C was about 60mgCg(-1). The results showed that the positive charge density of ZnO-coated zeolite adsorbents was proportional to the amount of ZnO coated on zeolite and thus, ZnO-coated zeolite adsorbents exhibited a greater affinity for negatively charged ions. Furthermore, the adsorption capacity of ZnO-coated zeolite adsorbents increased markedly after acid modification. Adsorption experiments demonstrated ZnO-coated zeolite adsorbents possessed high adsorption capacity to remove HA from aqueous solutions mainly due to strong electrostatic interactions between negative functional groups of HA and the positive charges of ZnO-coated zeolite adsorbents.

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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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Humic acid adsorption onto Mg/Fe layered double hydroxide

Cited by 85 publications

References 18 publications

Synergistic effect of humic and fulvic acids on Ni removal by the calcined Mg/Al layered double hydroxide

Synergistic effect of humic and fulvic acids on Ni removal by the calcined Mg/Al layered double hydroxide

An innovative zinc oxide-coated zeolite adsorbent for removal of humic acid

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

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