Organic-nanoclay composite materials as removal agents for environmental decontamination

Cavallaro, Giuseppe; Lazzara, Giuseppe; Rozhina, Elvira; Коннова, С. А.; Kryuchkova, Marina; Khaertdinov, N. N.; Fakhrullin, Rawil

doi:10.1039/c9ra08230a

Cited by 58 publications

(30 citation statements)

References 79 publications

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“…The use of biochar as a cost-efficient adsorbent of organic pollutant has received increasing attention [6]. However, biochar in power form might not be a promising adsorbent for removing phosphate.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Fe/Mg-Biochar Nanocomposites for Phosphate Removal

Xue-feng

Huang

2020

Materials

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Magnetic biochar derived from agricultural biomass has been recognized as a cost-effective biochar sorbent for phosphate removal. This study evaluated the use of novel Fe/Mg-biochar nanocomposites (WBC1x), prepared by impregnating ground walnut shell in a solution with a different molar ratio of Fe2+ to Mg2+, then pyrolyzing slowly, at a temperature of 600 °C, to remove phosphate. The results showed that MgO and Fe3O4 were loaded onto the biochar successfully through the impregnation-pyrolysis method and the composites were able to be separated easily by magnetic field. Meanwhile, a higher surface area and point of zero charge on WBC1x were observed compared to the non-magnetic biochar (WBC). Moreover, the isothermal adsorption and kinetics data further suggested the that phosphate adsorption onto WBC1x resulted from chemisorption. Additionally, the maximum phosphate adsorption capacity of WBC1x was 6.9 mg.g−1, obtained though the Langmuir–Freundlich model, which was threefold higher than WBC, where MgO addition could enhance the adsorption capacity of WBC1x markedly by improving the surface charge.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Fe/Mg-Biochar Nanocomposites for Phosphate Removal

Xue-feng

Huang

2020

Materials

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“…Clay minerals are an important source of raw material for obtaining, through physical and chemical modification, new supports with desired porosity, appropriate inorganic structure and adequate SiO 2 /Al 2 O 3 ratios, providing solids with unique characteristics [ 39 ]. Therefore, clays represent a promising material for cleaning natural resources and improving the quality of life of the population [ 40 ].…”

Section: Introductionmentioning

confidence: 99%

Structuring of ZnTiO3/TiO2 Adsorbents for the Removal of Methylene Blue, Using Zeolite Precursor Clays as Natural Additives

et al. 2021

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Adsorption is an effective method of removing harmful pollutants from air and water. In the present study, zeolites prepared by sol-gel method from two Ecuadorian clays were combined with precursor clays and the ZnTiO3/TiO2 semiconductor for adsorbing methylene blue (MB) as a water contaminant. The synthesized compounds were characterized using powder X-ray diffraction, X-ray fluorescence, scanning electron microscopy, energy dispersive X-ray, and surface area measurement. These compounds were combined to form cylindrical extrudates of 0.2 cm (diameter) and 1.0 cm (length). The adsorption characteristics of the composites were measured using batch sorption studies as a function of pH, initial concentration, and contact time. The pseudo-second-order model and the Langmuir isotherm model were better suited to the adsorption process. The equilibrium state was achieved around 180 min of adsorption, and a pH of 7 was established as the optimal operating condition. The maximum adsorption values of the dye were obtained with the composites derived from G-Clay, whose average adsorption capacity was 46.36 mg g−1, in contrast with composites derived from R-Clay, whose average adsorption value was 36.24 mg g−1. The results reflect that synthesized composites could be used potentially for the removal of cationic dye from wastewater.

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“…Recently, adsorbent materials were developed by functionalization of halloysite nanotubes with amino groups, and further, such materials were used for Pb 2+ ions’ removal [ 7 ]. Nanocomposite materials based on clay nanoparticles were developed and used for removal of inorganic and organic pollutants [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Performance of Functionalized Amberlite XAD7 with Dibenzo-18-Crown Ether-6 for Palladium Recovery

et al. 2021

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Due to the increased demand for palladium, as well due to its reduced availability in nature, its recovery from diluted waste solutions becomes a necessity, and perhaps an emergency. As a result of economic and technological development, new materials with improved adsorbent properties that are more efficient for metallic ions’ recovery were synthesized and introduced to market. The goal of this study was to obtain a new adsorbent material by functionalizing through impregnation a commercial polymeric support that was both inexpensive and environmentally friendly (Amberlite XAD7) with crown ether (di-benzo-18-crown-6—DB18C6). Crown ethers are known for their ability to form complexes within metallic ions, by including them inside of the ring, regardless of its atomic size. Adsorbent material was prepared by impregnation using the solvent-impregnated resin method (SIR). To highlight the presence of crown ether on the resin surface, a new synthesized material was characterized by scanning electron microscopy (SEM), elemental analysis X-ray energy dispersive spectroscopy (EDX) and Fourier transform infrared spectroscopy (FT-IR). The specific surface of the adsorbent material was also determined by the Brunauer–Emmett–Teller (BET) method. Adsorbent performances of the prepared material were highlighted by kinetic, thermodynamic and equilibrium studies and a possible mechanism was also proposed. The influence of specific parameters for the adsorption process (contact time, temperature, Pd(II) initial concentration) on the maximum adsorption capacity was pursued.

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Organic-nanoclay composite materials as removal agents for environmental decontamination

Abstract: Here we overview the recent advances in the fabrication of sustainable composite nanomaterials with decontamination capacity towards inorganic and organic pollutants.

Cited by 58 publications

References 79 publications

Synthesis of Fe/Mg-Biochar Nanocomposites for Phosphate Removal

Synthesis of Fe/Mg-Biochar Nanocomposites for Phosphate Removal

Structuring of ZnTiO3/TiO2 Adsorbents for the Removal of Methylene Blue, Using Zeolite Precursor Clays as Natural Additives

Evaluation of Performance of Functionalized Amberlite XAD7 with Dibenzo-18-Crown Ether-6 for Palladium Recovery

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