Multifunctional β-Cyclodextrin-EDTA-Chitosan polymer adsorbent synthesis for simultaneous removal of heavy metals and organic dyes from wastewater

Simultaneous Removal of Heavy Metals and Ciprofloxacin Micropollutants from Wastewater Using Ethylenediaminetetraacetic Acid-Functionalized β-Cyclodextrin-Chitosan Adsorbent

“…17,27−30 More recently, our research group reported the trifunctional β−CD−EDTA−CS polymer using a simple and easy chemical route for the simultaneous removal of heavy metals, i.e., mercury (Hg 2+ ) and cadmium (Cd 2+ ), and organic dyes, i.e., methylene blue (MB), crystal violet (CV), and safranin O (SO), as inorganic and organic pollutants, respectively, and proposed the removal mechanism based on chelation, electrostatic interaction, and host−guest inclusion complex formation with β-CD cavities. 31 In this work, we also reported the synergetic effect in the binary component system to show the enhancement in heavy metal adsorption. In this work, an eco-friendly composite was prepared by modifying the β-CD-CS using EDTA via a two-step process and characterized using FT-IR, XRD, FESEM, EDX, BET, TGA, etc.…”

“…Recently, the well-known chelating agent, EDTA is widely used in removing heavy metal ions through the hexadentate complex formation. Previously, different research groups have reported the functionalization of CS and β-CD with EDTA for the removal of single and multicomponent pollutants from wastewater. ,− More recently, our research group reported the trifunctional β–CD–EDTA–CS polymer using a simple and easy chemical route for the simultaneous removal of heavy metals, i.e., mercury (Hg 2+ ) and cadmium (Cd 2+ ), and organic dyes, i.e., methylene blue (MB), crystal violet (CV), and safranin O (SO), as inorganic and organic pollutants, respectively, and proposed the removal mechanism based on chelation, electrostatic interaction, and host–guest inclusion complex formation with β-CD cavities . In this work, we also reported the synergetic effect in the binary component system to show the enhancement in heavy metal adsorption.…”

Multifunctional β-Cyclodextrin Polymer for Simultaneous and Effective Removal of Organic Micropollutants, Heavy Metals, and Detrimental Microorganisms from Water

“…The molar ratios of A2G/ACD groups in PCD-G20, PCD-G50, and PCD-G100 were calculated to be 17.40, 33.86, and 45.88, respectively, based on the quantitative NMR analysis results since all of the H 18–19 in PCD-Gs were from A2G groups and the H 1 in PCD-Gs was from ACD groups (Table S2 in the Supporting Information). Combining with the GPC analysis results, the degrees of polymerization (DP n , defined in terms of the number average) were calculated and are listed in Table S2. , The TG curves of PCD-Gs (Figure S4 in the Supporting Information) showed two weight-loss stages at approximately 61–140 and 316–412 °C, which are related to the loss of surface adsorbed water and the decomposition of organic components, respectively …”

“…As shown in Table S4, the pseudo-second-order kinetic model was fitted well to the experimental data for both BPA and Cd­(II) metal ions due to higher correlation coefficients ( R 2 ) and excellent agreement between the values of q e,exp and q e,cal , which indicates that the adsorption rate was mainly determined by chemical adsorption, such as the π–π interactions and cavity hydrophobic inclusion for BPA, and the chemical chelation of carboxyl groups and phenolic hydroxyl groups for Cd­(II). Besides, it is clear that the slightly higher k values for BPA than Cd­(II) are probably due to the accessibility of increasing adsorption active sites for BPA on PCD-Gs than those of Cd­(II) metal ions. , …”

“…Water pollution is a great challenge for the global environment. The three types of pollutants that researchers have been focusing on are organic micropollutants (OMPs), metal ions, and detrimental microorganisms. − Because of their high toxicity, persistence, and bioaccumulation, they could cause long-term and significant harm to aquatic organisms and human beings, even at low concentrations (μg/L–mg/L). To solve these problems and deeply purify water, many technologies have been investigated to remove these three types of pollutants from water, such as biodegradation, chemical precipitation, membrane filtration, ozone decomposition, and adsorption. , However, most of these methods only have limited removal capacity toward a single type of pollutant, and they are either low efficiency or lead to secondary contamination (e.g., chlorinated disinfection byproducts).…”