Composite cryo-beads of chitosan reinforced with natural zeolites with remarkable elasticity and switching on/off selectivity for heavy metal ions.
TL;DR: Co2+-imprinted composite cryo-beads with switching on/off selectivity towards the template ions, engineered by selecting the appropriate zeolite-treatment conditions and/or controlling the initial sorption pH values are presented.
About: This article is published in International Journal of Biological Macromolecules.The article was published on 2020-12-01. It has received 25 citations till now. The article focuses on the topics: Sorption & Metal ions in aqueous solution.
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TL;DR: A systematic review of polysaccharide-based adsorbents for wastewater treatment is given in this paper, which is aimed at providing: (1) general design principles and some critical factors that may affect the adsorption and (2) future directions for the development of poly-saccharides-based wastewater adsorents.
96 citations
TL;DR: Chitosan has received widespread attention as an adsorbent for pollutants because of its low cost and great adsorption potentials as mentioned in this paper, however, it has defects such as sensitivity to pH, low thermal stability, and low mechanical strength.
83 citations
TL;DR: In this article, the authors investigated recent developments on the zeolite usage in the removal of heavy metals from polluted solutions and compared the capacity of adsorbents to remediate polluted solutions.
Abstract: The usage of zeolites in wastewater treatment has been extended in the two recent decades. This review investigates recent developments on the zeolite usage in the removal of heavy metals from polluted solutions. Various databases were used to search, evaluate, combine and analyze. The number of specific publications based on keywords linked with zeolite usage used in searching engines was more than 1000. However, about 200 publications passed the criteria set. The synthesis methodology for the production of zeolitic adsorbents, the modification of natural zeolites and their effect on the removal of heavy metals are described. Furthermore, the capacity of adsorbents to remediate polluted solutions and identify optimum conditions are reported and compared. The maximum adsorption capacity among heavy metals was for Pb(II) for all types of zeolite adsorbents (27.70 mg/g for chloride-modified zeolite, 113 mg/g for Fe-modified zeolite, 653 mg/g for surfactant modified zeolite, 808 mg/g for synthesized zeolites and 909.09 mg/g for nanozeolite). Cr(IV), Cu(II), Ni(II), Zn(II) and Co(II) were other heavy metals having good adsorption capacities on synthesized zeolites. According to the literature review, the adsorption of heavy metals by synthesized and nanozeolites is the most efficient.
46 citations
Cites methods from "Composite cryo-beads of chitosan re..."
...Ionimprinted composites were prepared by adding polymer, zeolite and cross-linker mixtures in liquid nitrogen (Sáez et al. 2020)....
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TL;DR: In this paper, the authors make an overview regarding the presence of heavy metals and the methods to remove them and minimize the environmental risk based on the use of zeolites as a sustainable and successful example.
Abstract: The environment is constantly exposed to a variety of chemical loads from natural and anthropogenic causes (xenobiotic substances). However, anthropogenic origin is the main source of xenobiotic substances, such as heavy metals in the environment. Moreover, the presence of these elements in water and soil has significant consequences because they are not easy to remove or deactivate. It is well known that irrigation and composted material can add heavy metals to the soil and deteriorate the quality of soil and plants, as well as the agricultural production with a high risk for food safety. Even more, when compost is been used, increases the metal content in the soils. This paper makes an overview regarding the presence of heavy metals and the methods to remove them and minimize the environmental risk based on the use of zeolites as a sustainable and successful example.
17 citations
TL;DR: In this article, the authors entrap Thymus vulgaris essential oil (EO) within the physically cross-linked sponge-like architecture of cryogels by ice template-assisted freeze-drying.
16 citations
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TL;DR: In this article, a method is described which makes it possible to calculate rigorously the distribution of the adsorption energies of the sites of a catalyst surface when the ad-sorption isotherms are known.
Abstract: A method is described which makes it possible to calculate rigorously the distribution of the adsorption energies of the sites of a catalyst surface when the adsorption isotherms are known, if the adsorption is localized and there are no interactions. This method is applied to a Freundlich isotherm, and also to a new theoretical isotherm which reduces to the Freundlich type for small pressures, but exhibits saturation for large pressures. It is shown that this isotherm corresponds to a distribution function which differs very little from a Gaussian one. The case of atomic adsorption of gases is also considered.
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