Mxene/alginate composites for lead and copper ion removal from aqueous solutions

Dong, Yang; Sang, Dashen; He, Chengdong; Sheng, Xinfeng; Lei, Longwen

doi:10.1039/c9ra05251h

Cited by 162 publications

(36 citation statements)

References 29 publications

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“…A similar heterogeneous process was reported for the removal of aqueous Ba 2+ by natural and Fe(III) oxide-modified allophane, beidellite, and zeolite adsorbents [ 44 ]. The pseudo-second-order kinetic model best described the removal of Cu(II) and Pb(II) from wastewater in the case of Mxene/alginate composites [ 47 ], and of Pb(II) from an aqueous solution with activated carbon produced from palm fiber with treated oil [ 48 ].…”

Section: Resultsmentioning

confidence: 99%

Adsorption of Copper (II) from Aqueous Solutions with Alginate/Clay Hybrid Materials

et al. 2021

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Massive amounts of industrial and agricultural water around the world are polluted by various types of contaminants that harm the environment and affect human health. Alginic acid is a very versatile green polymer used for heavy metal adsorption due to its availability, biocompatibility, low cost, and non-toxic characteristics. The aim of this paper was to prepare new low-cost hybrid composite beads using sodium alginate with treated montmorillonite and kaolin for the adsorption of copper (Cu) cations. Modified and unmodified clays were investigated by studying their morphology and elemental composition, functional groups, and mean particle size and particle size distribution. The characterization of alginate/clay hybrid composite beads was carried out by evaluating surface morphology (by scanning electron microscopy, SEM), crystallinity (by X-ray diffraction, XRD), and point of zero charge (pHpzc)(Zeta Potential Analyzer). Batch adsorption experiments of alginate/clay hybrid composite beads investigated the effect of metal concentration in the range of 1–4 mg L−1 on Cu(II) removal, adsorption kinetic for maximum 240 min, and Langmuir and Freundlich adsorption isotherms by using atomic absorption spectrometry. The pseudo-second-order kinetic model best fitted the adsorption for alginate/montmorillonite beads (R2 = 0.994), while the diffusion process was predominant for montmorillonite/kaolin beads (R2 = 0.985). The alginate/clay hybrid materials best fitted the Langmuir isotherm model.

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Section: Resultsmentioning

confidence: 99%

Adsorption of Copper (II) from Aqueous Solutions with Alginate/Clay Hybrid Materials

et al. 2021

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“…[191][192][193][194][195][196][197] As adsorbents, MXenes have an excellent removal efficiency and selectivity for heavy metal ions (HMIs) with the strong absorption and reducing ability. [201] Generally, the concentration of toxic HMIs (e.g., Pb 2+ , [202][203][204][205] Hg 2+ , [206] Ba 2+ [199,207] ) in water is far lower than that of light metal ions (Li + , Na + , K + , Mg 2+ , Ca 2+ ). This means that the interactions of HMIs with MXenes are strong enough to break the shielding effect of water molecules or coordinating anions, with the formation of strong bonds.…”

Section: Applications In Water Treatmentmentioning

confidence: 99%

Roles of Metal Ions in MXene Synthesis, Processing and Applications: A Perspective

Tao

Shang

et al. 2022

Advanced Science

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With a decade of effort, significant progress has been achieved in the synthesis, processing, and applications of MXenes. Metal ions play many crucial roles, such as in MXene delamination, structure regulation, surface modification, MXene composite construction, and even some unique applications. The different roles of metal ions are attributed to their many interactions with MXenes and the unique nature of MXenes, including their layered structure, surface chemistry, and the existence of multi‐valent transition metals. Interactions with metal ions are crucial for the energy storage of MXene electrodes, especially in metal ion batteries and supercapacitors with neutral electrolytes. This review aims to provide a good understanding of the interactions between metal ions and MXenes, including the classification and fundamental chemistry of their interactions, in order to achieve their more effective utilization and rational design. It also provides new perspectives on MXene evolution and exfoliation, which may suggest optimized synthesis strategies. In this respect, the different effects of metal ions on MXene synthesis and processing are clarified, and the corresponding mechanisms are elaborated. Research progress on the roles metal ions have in MXene applications is also introduced.

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“…It can be seen that the distinctive peaks at 3,436, 1,631 and 805 cm À1 were corresponding to the -OH stretching vibrations of Ti 3 C 2 T x MXene, intimating that there were water moieties and -OH group existing on the surface of adsorbent (Shahzad et al 2019). The vibration band at 547 cm À1 presented the Ti-O stretching bands (Karthikeyan et al 2021a(Karthikeyan et al , 2021b, and the adsorption peak at 1629 and 1400 cm À1 belonged to the C ¼ O and C-O stretching vibration of the carboxyl group (Dong et al 2019). After Cr(VI) adsorption, the peak at 3,436 cm À1 was shifted to 3,430 cm À1 , indicating the hydrogen bonds were formed between the Ti 3 C 2 T x MXene and Cr(VI).…”

Section: Results and Discussion Characterizationmentioning

confidence: 94%

Highly efficient scavenging of Cr(VI) by two-dimensional titanium carbide nanosheets: kinetics, isotherms and thermodynamics analysis

Chang

et al. 2021

Water Science and Technology

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In this study, two-dimensional (2D) MXene material (Ti3C2Tx) was employed to investigate its potentials toward the Cr(VI) removal in aqueous system by batch experiments. Characterization techniques such as SEM-EDS, HRTEM, XRD, FI-TR and XPS were used to analyze the structure and interaction of Ti3C2Tx before and after Cr(VI) adsorption. The results indicated that layered structure of Ti3C2Tx had unique surface functional properties and abundant active sites, such as –OH, Ti–O, C = O, which exhibited high adsorption capacity for the Cr(VI) removal. The Cr(VI) adsorption capacity by Ti3C2Tx decreased with the increase of pH, and its maximum value can reach 169.8 mg/g at pH = 2.0. The adsorption kinetic was well-explained by a pseudo-second-order kinetic, indicating that chemical interaction played a dominant role in the adsorption of Cr(VI) on Ti3C2Tx. Meanwhile, the isotherm data was calculated to conform the Freundlich isotherm model. Thermodynamic analysis indicated that the adsorption process of Cr(VI) on Ti3C2Tx was a spontaneous endothermic process. These experimental results revealed that Ti3C2Tx had tremendous potential in heavy metals adsorption from aqueous solutions.

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Mxene/alginate composites for lead and copper ion removal from aqueous solutions

Abstract: Studies on Mxene/alginate composite adsorption have opened up a new avenue for designing adsorbents possessing high adsorption capacity and high efficiency.

Cited by 162 publications

References 29 publications

Adsorption of Copper (II) from Aqueous Solutions with Alginate/Clay Hybrid Materials

Adsorption of Copper (II) from Aqueous Solutions with Alginate/Clay Hybrid Materials

Roles of Metal Ions in MXene Synthesis, Processing and Applications: A Perspective

Highly efficient scavenging of Cr(VI) by two-dimensional titanium carbide nanosheets: kinetics, isotherms and thermodynamics analysis

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