Highly enhanced adsorption for the removal of Hg(II) from aqueous solution by Mercaptoethylamine/Mercaptopropyltrimethoxysilane functionalized vermiculites

Tran, Lytuong; Wu, Pingxiao; Zhu, Yongjun; Yang, Lin; Zhu, Ning

doi:10.1016/j.jcis.2015.01.006

Cited by 86 publications

(44 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The existing organics on the external surface would also be one reason for the decrease in porous volume. Similar behavior observed has been documented in the previous literatures [8,18,37]. Therefore, it is proposed that the organic ligand is likely to be grafted on the outside surface of both Vm and Mt after functionalization by BAL, further supporting the XRD and SEM observations.…”

Section: Bet Analysissupporting

confidence: 90%

“…8. As it can be seen, the efficiency of Hg(II) uptake by the four samples increases initially with the rising pH values and reaches a maximum at 5.0 (vermiculites) or 6.0 (montmorillonites), the results of which are similar to our previous work [8]. It is supposed that the Hg(II) uptake at low pH values is suppressed by the competition between protons (H + ), hydronium (H 2 O + ) and Hg(II) ions.…”

Section: Effect Of Initial Ph Valuessupporting

confidence: 89%

“…Additionally, it was suggested that the binding selectivity of thiol groups toward the target metal ions is important for many practical applications such as wastewater treatment in the coexistence of various metals [20]. In our laboratory, we have demonstrated that both mercaptopropyltrimethoxysilane and mercaptoethylamine functionalized vermiculite, especially the former, presented high adsorption capacity of Hg(II) ions from aqueous solution, which were mainly attributed to the grafting thiol groups that showed a high binding affinity to Hg(II) in a wide range of pH values [8]. However, it should be noted that the metal adsorption is directly associated with the amount of SH available in the adsorbent [21].…”

Section: Introductionmentioning

confidence: 88%

“…2a) is found to be rather intense at 6.15 • with d 001 of 1.44 nm. The peaks at 7.4 • and 10.6 • are assigned to the impurity of mica mineral, while the peak at 18.12 • corresponds to octahedral iron in vermiculite [8,24]. However, after functionalized by BAL, the peak 0 0 1 has a slight increase in intensity and the basal spacing has a negligible change.…”

Section: Xrd Analysismentioning

confidence: 99%

See 3 more Smart Citations

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

Tran

Zhu

et al. 2015

Applied Surface Science

Self Cite

View full text Add to dashboard Cite

Section: Bet Analysissupporting

confidence: 90%

Section: Effect Of Initial Ph Valuessupporting

confidence: 89%

Section: Introductionmentioning

confidence: 88%

Section: Xrd Analysismentioning

confidence: 99%

See 2 more Smart Citations

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

Tran

Zhu

et al. 2015

Applied Surface Science

Self Cite

View full text Add to dashboard Cite

“…Magnetic separation provides a promising technique for the separation of GO materials due to its simplicity, 14 high efficiency and rapid speed compared to ltration and centrifugation. 1,15,16 For instance, Wang et al applied magnetic chitosan/GO to adsorb Pb(II) and obtained a maximum adsorption capacity of 79 mg g À1 (BET surface area ¼ 392.5 m 2 g À1 , pH ¼ 5); 17 Cui et al…”

Section: 10mentioning

confidence: 99%

Adsorption of mercury(ii) with an Fe₃O₄ magnetic polypyrrole–graphene oxide nanocomposite

et al. 2017

View full text Add to dashboard Cite

To enhance the ability to remove mercury(II) from aqueous media, an Fe 3 O 4 magnetic nanocomposite (PPy-GO) composed of polypyrrole (PPy) and graphene oxide (GO) was synthesized in situ and characterized via scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), X-ray photoelectron spectrometry (XPS), X-ray diffraction (XRD), Fourier transform-infrared spectroscopy (FT-IR), zeta potential analysis, vibrating sample magnetometer (VSM) and the Brunauer-Emmett-Teller (BET) method. The performance of the magnetic PPy-GO for adsorbing mercury(II) from water along with the effects of solution pH, adsorbent dosage, coexisting ions, reaction time and temperature were studied in detail. The adsorption kinetics, isotherms and thermodynamics were investigated in detail to gain insights into the adsorption process. The results show that the BET surface area of the magnetic PPy-GO reached 1737.6 m 2 g À1. The Langmuir capacity of the magnetic PPy-GO for mercury(II) adsorption was 400.0 mg g À1 at 300 K and pH 7 AE 0.1.After adsorption, the magnetic PPy-GO nanocomposite could be efficiently separated from water via a magnetic field. The adsorption process was endothermic and spontaneous and occurred in accord with the Langmuir and pseudo-second-order models. The overall adsorption of mercury(II) not only involved chemisorption, but was also partially governed by intra-particle diffusion. Data from the preliminary application of magnetic PPy-GO to remove heavy metals from real electroplating effluent indicated a high removal efficiency of over 99% for mercury(II). Finally, a possible adsorption mechanism was discussed. All data showed that the magnetic PPy-GO material is a promising adsorbent to remove mercury(II) from aqueous media.

show abstract

La‐modified vermiculites for efficient adsorption of Congo red

Huang

2017

Asia-Pacific J Chem Eng

View full text Add to dashboard Cite

In this study, we utilized lanthanum to modify vermiculite (RV) targeting at high dye removal and superior reusability. La‐modified RV materials were synthesized; followed by detailed characterizations and adsorption studies. Compared with the BET surface area (SBET) of RV (2.98 m2·g−1), those of La‐modified RV samples were increased by up to 8 times. Their adsorption performances were investigated by employing Congo red (CR) as the target pollutant in aqueous solution. An increasing loading of La in RV led to enhanced CR removal capacity. The experimental equilibrium data of the La‐modified RV were fitted better by using the Freundlich model than the Langmuir model. At the same initial concentration of 100 mg·L−1, the equilibrium capacity of CR was 32.3–80.5 mg·g−1 using the La‐modified RV adsorbents, which was 2.5–7.8 times greater than that using RV (9.1 mg·g−1). Meanwhile, the adsorption kinetics was analysed by the pseudo‐first‐order, pseudo‐second‐order and intra‐particle diffusion models; the kinetics followed the pseudo‐second‐order model best and the intra‐particle diffusion was not the only rate limiting step during adsorption. Superior adsorption capacity of LaRV‐0.2, which possessed 29.93 wt% La loading, was observed in the pH range of 3–9; especially the high removal rate (~94%) was observed when pH = 3. The removal rate was increased to ~96.8% in the presence of NaCl compared with 91.6% in the absence of NaCl. The as‐synthesized adsorbent maintained a superior adsorption capacity after four adsorption–desorption cycles. The capacity of the regenerated adsorbent in the fourth adsorption–desorption cycle was only 4.2% lower than that of the fresh LaRV‐0.2 sample, suggesting great potential in practical wastewater treatment. © 2017 Curtin University and John Wiley & Sons, Ltd.

show abstract

Highly enhanced adsorption for the removal of Hg(II) from aqueous solution by Mercaptoethylamine/Mercaptopropyltrimethoxysilane functionalized vermiculites

Cited by 86 publications

References 51 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 mercury(ii) with an Fe₃O₄ magnetic polypyrrole–graphene oxide nanocomposite

La‐modified vermiculites for efficient adsorption of Congo red

Contact Info

Product

Resources

About

Highly enhanced adsorption for the removal of Hg(II) from aqueous solution by Mercaptoethylamine/Mercaptopropyltrimethoxysilane functionalized vermiculites

Cited by 86 publications

References 51 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 mercury(ii) with an Fe3O4 magnetic polypyrrole–graphene oxide nanocomposite

La‐modified vermiculites for efficient adsorption of Congo red

Contact Info

Product

Resources

About

Adsorption of mercury(ii) with an Fe₃O₄ magnetic polypyrrole–graphene oxide nanocomposite