Enhanced simultaneous adsorption of Cd(II) and Pb(II) on octylamine functionalized vermiculite

Ahmed, Zubair; Wu, Pingxiao; Lu, Jinhua; Liu, Junqin; Ye, Quanyun; Yang, Qi‐Liang; Zhu, Nengwu

doi:10.1016/j.colsurfa.2020.125285

Cited by 34 publications

(9 citation statements)

References 83 publications

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“…The SEM results for VER and HEX are presented in (Figure S4a,d), along with an insight look through zoomed imaging in (Figure S4b,e), respectively. VER surface with tightly stacking and uniform thickness distribution (Figure S4a), turned rougher after modifying with HEX (Figure S4d), which was conducive for enhanced adsorption of heavy metal ions, due to the increase of pore diameter and active sites [38], which was in accordance with BET analysis results. Brighter areas on the surface indicate the compact and typical arrangement of aluminosilicates scattered on surface with small fragments.…”

Section: Bet Analysis and Surface Morphologysupporting

confidence: 80%

“…Pseudo-first-order (PFO), and pseudo-second-order (PSO) models were used to analyze kinetic data, the equations for these models are given in Table S2. Kinetic results were in better agreement with PSO model with higher R 2 values in all systems, suggesting chemisorption process [38]. Fitting parameters are summarized in Table S6.…”

Section: Adsorption Kineticsmentioning

confidence: 57%

“…This happened since a lone pair of the amino group's nitrogen atom (hexylamine) was donated to form a shared bond between metal ions and the N atoms. As a result, the nitrogen's electron cloud density was reduced, and peak was shifted at a higher BE [32,38]. Hence, the chelation between -NH 2 or -NH 3 After analyzing the pH, zeta potential, XPS, and effect of co-existing ions results thoroughly, it was revealed that ion-exchange and complexation were the dominant mechanisms.…”

Section: Adsorption Mechanism Overviewmentioning

confidence: 97%

“…Studies reveal that clay minerals can be easily modified for enhanced adsorption results [36]. Adsorbent-pollutant interactions can be improved by the basic chemical functions in materials such as -OH and amine groups and, correspondingly, enhanced adsorption results of amine-enriched materials towards toxic metals in water have been reported in previous studies [37][38][39][40]. Therefore, in this study, hexylamine (HEX) [CH 3 (CH 2 ) 5 NH 2 ] was chosen as a modifier.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Single and Simultaneous As(III) Adsorption in Pearl River Delta Water by Hexylamine Functionalized Vermiculite

Ahmed

et al. 2021

Water

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Enhanced As(III) removal (>99.7) was achieved by a novel organoclay (HEX-VER) adsorbent in Pearl River Delta water. Single and simultaneous As(III) removal in the presence of Cd(II) and/or Pb(II) by batch adsorption tests was analyzed. Spectroscopic, spectrometric, microscopic, and potentiometric techniques were used for characterization of the adsorbents. The parameters affecting As(III) adsorption, including pH, kinetic, isotherm, thermodynamic, and co-existing ions (Cl−, F−, NO3−, CO32−, SO42−, Ca2+ and Mg2+) were also investigated. The results showed that HEX-VER owned different morphology and larger average pore diameter after functionalization, resulting in an improvement of As (III) adsorption capacity. Further analysis confirmed that adsorption was of the monomolecular layer, well-described by the Langmuir isotherm model. The dominant mechanisms for As(III) removal were ion-exchange and complexation. Moreover, HEX-VER was regenerated for five consecutive cycles, and the removal ratio was ≈ 92%, showing its great regeneration potential. These findings suggest that the proposed inexpensive adsorbent has potential for practical applications of As(III) removal from river water.

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Section: Bet Analysis and Surface Morphologysupporting

confidence: 80%

Section: Adsorption Kineticsmentioning

confidence: 57%

Section: Adsorption Mechanism Overviewmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Enhanced Single and Simultaneous As(III) Adsorption in Pearl River Delta Water by Hexylamine Functionalized Vermiculite

Ahmed

et al. 2021

Water

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“…The solution pH not only affects the charges on the adsorbent surface but also affects the ionization of the solute or inhibits ions. Therefore, initial metal solution pH values that are too high should be avoided as they may cause the precipitation of metal complexes and interfere with the separation between adsorption and precipitation [23,24].…”

Section: Effects Of Process Variables On Biosorption Capacitymentioning

confidence: 99%

An optimization study for bio-removal of lead from aqueous environments by alkali modified Polyporus Squamosus

Yılmaz

Ecer

Şahan

2021

MANAS Journal of Engineering

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Rapidly increasing industrialization and urbanization cause serious environmental pollution. Discharge of polluting material from various industries such as smelting, mining, ore processing, and metal plating into the environment without treatment causes serious pollution and can have dangerous effects on the environmental balance. The utilization of low-cost adsorbents from biological materials as a replacement for costly traditional methods for adsorption of heavy metal pollutants from wastewater was reviewed. This study aimed to investigate the biosorption of Pb(II) ions from aqueous solutions with NaOH-modified Polyporus squamosus biosorbent and optimize the biosorption conditions. Firstly, the parameters most influencing the response of the biosorption for Pb(II) (initial Pb(II) concentration (Co), pH, temperature and biomass dose) were determined using Central Composite Design (CCD). The optimum conditions were evaluated as 60.76 mg/L, 6.3, 25 °C, and 0.23 g for Co, initial pH, temperature and biomass dose, respectively. From the optimum conditions, the adsorption yield and the adsorption capacity were obtained as 93.8% and 23.63 mg/g, respectively.

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Natural Vermiculite Slice Modified by CTAB and Zirconium for Selective Adsorption of Phosphate

Zeng,

Zou,

Feng

et al. 2023

Water Air Soil Pollut

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Enhanced simultaneous adsorption of Cd(II) and Pb(II) on octylamine functionalized vermiculite

Cited by 34 publications

References 83 publications

Enhanced Single and Simultaneous As(III) Adsorption in Pearl River Delta Water by Hexylamine Functionalized Vermiculite

Enhanced Single and Simultaneous As(III) Adsorption in Pearl River Delta Water by Hexylamine Functionalized Vermiculite

An optimization study for bio-removal of lead from aqueous environments by alkali modified Polyporus Squamosus

Natural Vermiculite Slice Modified by CTAB and Zirconium for Selective Adsorption of Phosphate

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