Environmental protection draws great attention worldwide due to the release of various organic and inorganic pollutants, because these pollutants might cause critical environmental problems [1]. Endocrinedisrupting chemicals (EDCs) are environmental contaminants that interfere with the normal hormonal functions in wildlife and humans [2-4]. The wide range of chemicals reported as EDCs include some phenol compounds, among which bisphenol A (BPA) has received more attention due to its use as one of the most produced compounds worldwide [5-9]. The major concern in the control of BPA is its use in the manufacture of materials that come into contact with foods, such as water bottles, cans, and containers for food, among many others, which are the major sources of human exposure [10-11]. Adsorption is used in water treatment for heavy metals, EDCs, for the control of taste, odor and color. Various adsorbents are widely employed for research, among which carbon-based nanomaterials have been extensively studied in recent years [12]. Carbon nanotubes (CNTs) are relatively new adsorbents of trace pollutants from water, because they have a good specific surface area and small, hollow, and layered structures. These structures have drawn special attention due to their unique physicochemical properties and the variety of potential applications. CNTs have
In this study, non-irradiated and weathered multiwalled carbon nanotubes (MWCNTs) obtained through irradiation, were studied as adsorbents for BPA, both nanomaterials being characterized before and after the adsorption process. The objectives of our investigation were to compare the characteristics of non-irradiated and irradiated MWCNTs, to evaluate the adsorption capacity of BPA by pristine and irradiated MWCNTs and to determine the variation of the kinetic, sorption and thermodynamic parameters during sorption process using both sorbents.
The purpose of this study was to evaluate the potential of ion exchange resins to remove the color from industrial wastewaters. In textile-leather dyeing, paper, colour, printing, cosmetics, pharmaceutical and other industries the synthetic dyes are extensively used. Adsorption techniques are much used to remove certain classes of pollutants from waters, especially from industrial colored wastewaters. In recent years, functional polymers have been increasingly tested as a potentially alternative to traditional adsorbents due to their vast surface area, perfect mechanical rigidity, adjustable surface chemistry and feasible regeneration under mild conditions. The strongly basic anion exchanger resins were used as an adsorbent for the acid, direct and reactive dyes adsorption from the coloured wastewaters.
Flexible screen-printed electrodes (SPE) were modified in a simple manner with different composite nanomaterials based on carbon allotropes, polymers, and metallic nanoparticles, for amperometric detection of nitrites in soil. Multiwalled carbon nanotubes (MWCNT), chitosan (CS), silver nanoparticles (AgNPs), 1,8-diaminonaphthalene (1,8-DAN), and a sol-gel (SG) matrix were used for modification of the carbon paste working electrodes. Sensitive and selective detection of nitrite was achieved by using a MWCNT-CS-modified sensor, in acetate buffer at pH 5, at an applied potential of 0.58 V vs. Ag/AgCl. The MWCNT-CS-based sensor displayed a specific sensitivity of 204.4 mA·M−1·cm−2, with a detection limit of 2.3 µM (S/N = 3) in a linear range up to 1.7 mM, showing good stability, reproducibility, and selectivity towards other interfering species. A miniaturized portable system using the developed flexible electrochemical MWCNT-CS-based sensors was dedicated for the detection of nitrite in different samples of soil solutions extracted by using suction lysimeters.
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