A Sorption Study of Bisphenol A in Aqueous Solutions on Pristine and Oxidized Multi-Walled Carbon Nanotubes

Abstract

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

Sorption of Bisphenol A (BPA) in Aqueous Solutions on Fullerene C60

“…HPLC determinations using an external standard calibration method was used for the quantification of BPA. All the analysis were done by an Agilent 1100 Series HPLC instrument and described elsewhere, in [13].…”

“…The Brunauer-Emmet-Teller (BET) specific surface area of the nano sorbent was obtained from the nitrogen adsorption/desorption isotherms, using a Quantachrome NOVA 2200e instrument [13]. The specific surface area was calculated according to the BET equation.…”

“…Samples were placed in covered Al crucibles and heated with 5 K· min -1 from room temperature to 550 °C under a flow of 50 mL · min -1 Ar. An empty Al crucible was used as reference [13].…”

Drought Analysis Using Satellite-Based Data and Spectral Index in Upper Northeastern Thailand

“…Drought has a direct impact on the economy and has indirect impacts on society and culture, as people abandon their habitat and migrate to work in cities when farming is not possible. In addition, very dry weather can also cause forest fires, which are another source of environmental problems [1][2][3][4]. Drought in the northeast has long been a major problem, mainly due to rainfall.…”

Adsorption of Triclocarban on Pristine and Irradiated MWCNTs in Aqueous Solutions

“…Its log Kow values range between 4.2 and 6.0 [6,16]. In this work, based on previous experience of our group on sorption of environmental contaminants on carbon based nanomaterials [30,31], the adsorption of triclocarban was investigated on pristine and irradiated MWCNTs, at two different temperatures, specific to cold and warm seasons, in aqueous synthetic samples at different pH values and for different concentrations of humic acid (HA) from natural organic matter. These matrices were chosen in order to understand the influence of the chemical composition of the natural aqueous systems where these nanomaterials might appear.…”