A green <scp>l</scp>-cysteine modified cellulose nanocrystals biosorbent for adsorption of mercury ions from aqueous solutions

Li, Weixue; Ju, Benzhi; Zhang, Shufen

doi:10.1039/c9ra00048h

Cited by 46 publications

(33 citation statements)

References 48 publications

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“…Semiconductors nanoparticles (NPs) have found numerous applications in different technological fields going from photovoltaic devices to medical imaging, lasers, LEDs and photocatalysis (Dao 2020;Rtimi et al 2021;Meikle et al 2020;Long et al 2020;Su et al 2020;Li et al 2019;Daskalakis et al 2020;Rtimi et al 2021). These applications are supported by their unique properties as compared to their bulk counterpart, which arise from the confinement of the charge carriers as a result of their small sizes.…”

Section: Introductionmentioning

confidence: 99%

Fast and effective catalytic degradation of an organic dye by eco-friendly capped ZnS and Mn-doped ZnS nanocrystals

Ouni

Mohamed

Chaaben

et al. 2022

Environ Sci Pollut Res

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Undoped and Mn-doped ZnS nanocrystals encapsulated with thioglycolic acid were synthetized and characterized with different techniques, and finally tested in the photodegradation of a methyl orange in aqueous solution under UV and sunlight irradiations.FTIR and X-ray diffraction results confirmed the functionalization of these nanocrystals surface by thioglycolic acid and the formation of crystalline structures of ZnS and Mn-doped ZnS with cubic and hexagonal phases. Calculated average size of ZnS nanocrystals was in the range of 2 -3 nm. It was observed a blue shift of the absorbance threshold and the estimated bandgap energies were higher than that of Bulk ZnS thus confirming the quantum confinement effect of charge carriers. Photoluminescence spectra of ZnS nanocrystals exhibited emission in the range of 410-490 nm and the appearance of an additional emission band around 580 nm (2.13eV) connected to the 4 𝑇1→ 6 𝐴1 transition of the Mn 2+ ions.Photodegradation of methylene orange with undoped and Mn-doped ZnS-TGA nanocrystals was investigated. Dye adsorption prior to photocatalysis using nanocrystals was studied via kinetic experiments and statistical physics models. The maximum dye adsorption capacity on doped ZnS-TGA was ~ 26.98 mg/g. The adsorption kinetic was found to follow the pseudosecond-order kinetic model.According to the statistical physics results, the calculated adsorption energy was 22.47-23.47 kJ/mol and it showed that the dye adsorption was associated to the hydrogen interaction where the removal process was feasible and multimolecular. The photocatalytic activity of undoped ZnS nanoparticles under UV irradiation showed better efficiency than doped nanocrystals thus indicating that manganese doping generated a dropping of the photocatalytic degradation of the dye. Dye degradation efficiency of 81.37% using ZnS-TGA nanocrystals was achieved after 6 min, which indicated that ZnMnS-TGA nanocrystals may be considered as an alternative low cost and environmental friendly material for facing water pollution caused by organic compounds via photodegradation processes.

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Section: Introductionmentioning

confidence: 99%

Fast and effective catalytic degradation of an organic dye by eco-friendly capped ZnS and Mn-doped ZnS nanocrystals

Ouni

Mohamed

Chaaben

et al. 2022

Environ Sci Pollut Res

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“…Compared with the synthetic polymers, cellulose is a natural nontoxic and biodegradable polymer with low cost, which is being widely used in a number of applications, especially for applications as adsorbent [15,16,17,18,19]. Cellulose microspheres, which can be used easily in adsorption and chromatographic separation, have enormous potential of candidate applications in the industry [20].…”

Section: Introductionmentioning

confidence: 99%

Novel Functionalized Cellulose Microspheres for Efficient Separation of Lithium Ion and Its Isotopes: Synthesis and Adsorption Performance

Chen

Peng

et al. 2019

Molecules

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The adsorption of lithium ions(Li+) and the separation of lithium isotopes have attracted interests due to their important role in energy storage and nuclear energy, respectively. However, it is still challenging to separate the Li+ and its isotopes with high efficiency and selectivity. A novel cellulose-based microsphere containing crown ethers groups (named as MCM-g-AB15C5) was successfully synthesized by pre-irradiation-induced emulsion grafting of glycidyl methacrylate (GMA) and followed by the chemical reaction between the epoxy group of grafted polymer and 4′-aminobenzo-15-crown-5 (AB15C5). By using MCM-g-AB15C5 as adsorbent, the effects of solvent, metal ions, and adsorption temperature on the adsorption uptake of Li+ and separation factor of 6Li/7Li were investigated in detail. Solvent with low polarity, high adsorption temperature in acetonitrile could improve the uptake of Li+ and separation factor of lithium isotopes. The MCM-g-AB15C5 exhibited the strongest adsorption affinity to Li+ with a separation factor of 1.022 ± 0.002 for 6Li/7Li in acetonitrile. The adsorption isotherms in acetonitrile is fitted well with the Langmuir model with an ultrahigh adsorption capacity up to 12.9 mg·g−1, indicating the unexpected complexation ratio of 1:2 between MCM-g-AB15C5 and Li+. The thermodynamics study confirmed the adsorption process is the endothermic, spontaneous, and chemisorption adsorption. As-prepared novel cellulose-based adsorbents are promising materials for the efficient and selective separation of Li+ and its isotopes.

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“…Cysteine modified cellulose nanocrystal [52] 0.05 Funcionalized carbon [56] 3.34 Ui-66-NH2 post-funcionalization [24] 0.03 Magnetic hydrogel of lignin [74] Practically all of the manuscripts considered the pH, of the Hg(II)-bearing aqueous solution, as one of the variables to be investigated, and most of the manuscripts considered the 1-8 pH range for their investigations. However, and according with the stability diagrams generated from the authors of this review ( Figure 6) by MEDUSA Program [120], in nitrate medium and from approximately at a pH of 4, the predominant species is Hg(OH)2 which does not solubilize in the medium; in the case of chloride medium this pH value shifted until the value of 5.5.…”

Section: 60mentioning

confidence: 99%

“…A biosorbent, l-cysteine modified cellulose nanocrystals (Lcys-CNCs), was synthesized by functionalizing high surface area cellulose nanocrystals with l-cysteine using periodate oxidation and reductive amination reaction, and the product was used for Hg(II) removal through strong mercury chelating groups [52]. Again, the pseudo-second order model and the Langmuir model of monolayer adsorption described the metal uptake, with a maximum concentration of 923 mg/g.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Processing for the Removal of Toxic Hg(II) from Liquid Effluents: Advances in the 2019 Year

López

2020

Metals

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Mercury is a toxic metal, thus, it is an element which has more and more restrictions in its uses, but despite the above, the removal of this metal, from whatever the form in which it is encountered (zero valent metal, inorganic, or organic compounds), and from different sources, is of a widespread interest. In the case of Hg(II), or Hg2+, the investigations about the treatment of Hg(II)-bearing liquid effluents (real or in most cases synthetic solutions) appear not to end, and from the various separation technologies, adsorption is the most popular among researchers. In this topic, and in the 2019 year, more than 100 publications had been devoted to this field: Hg(II)-removal-adsorption. This work examined all of them.

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A green l-cysteine modified cellulose nanocrystals biosorbent for adsorption of mercury ions from aqueous solutions

Abstract: A green biosorbent, l-cysteine modified cellulose nanocrystals, was successfully synthesized and applied to adsorb mercury ions from aqueous solutions.

Cited by 46 publications

References 48 publications

Fast and effective catalytic degradation of an organic dye by eco-friendly capped ZnS and Mn-doped ZnS nanocrystals

Fast and effective catalytic degradation of an organic dye by eco-friendly capped ZnS and Mn-doped ZnS nanocrystals

Novel Functionalized Cellulose Microspheres for Efficient Separation of Lithium Ion and Its Isotopes: Synthesis and Adsorption Performance

Adsorption Processing for the Removal of Toxic Hg(II) from Liquid Effluents: Advances in the 2019 Year

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