Modification of epoxy groups of poly(hydroxylmethyl methacrylate-co-glycidyl methacrylate) cryogel with H 3 PO 4 as adso
- PDF / 1,593,644 Bytes
- 19 Pages / 595.276 x 790.866 pts Page_size
- 14 Downloads / 210 Views
RESEARCH ARTICLE
Modification of epoxy groups of poly(hydroxylmethyl methacrylate-co-glycidyl methacrylate) cryogel with H3PO4 as adsorbent for removal of hazardous pollutants Gulay Bayramoglu 1,2
&
Mehmet Yakup Arica 1
Received: 28 April 2020 / Accepted: 16 July 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Poly(hydroxylmethyl methacrylate-co-glycidyl methacrylate) (p(HEMA-GMA)) macroporous cryogel with high density of epoxy groups was synthesized, and the epoxy groups of the cryogel were modified into phosphonate groups. The effects of dye concentrations, adsorption time, pH, salt concentration, and adsorption temperature on the adsorption of Direct Blue-53 (DB53) and Reactive Blue-160 (RB-160) dyes were studied. The maximum adsorption capacity was found to be 245.3 and 155.8 mg/ g (0.255 or 0.119 mmol/g) for the DB-53 and RB-160 dyes, respectively. The higher adsorption capacity achieved for the DB-53 compared with the RB-160 dye can result from the pendant primary amino groups of the DB-53 dye as well as the smaller size of the dye molecule. The Langmuir isotherm model and the pseudo-second-order kinetic model well described the experimental data. The p(HEMA-GMA)-PO42− adsorbent has many operational advantages for the removal of pollutants. It could be a promising adsorbent to be used in industrial wastewater treatment. Keywords Redox polymerization . Cryogel . Phosphate groups . Adsorption . Dyes
Introduction Wastewaters from textile industries are the main source of environmental pollution from dyes and other chemicals. Dyes must be removed from wastewaters in regard to their possible toxicity to human life and ecosystems as well as for esthetic reasons. For the removal of these hazardous pollutants, many methods have been proposed such as adsorption, biological treatment, photocatalytic degradation, electrochemical oxidation, and membrane separation (Zhou et al. 2011; Bayramoglu and Arica 2018; Zhang et al. 2020; Arica et al. 2019; Bayramoglu et al. 2012; Xu et al. 2020; Gemeay et al. 2020).
Responsible editor: Angeles Blanco * Gulay Bayramoglu [email protected] 1
Biochemical Processing and Biomaterial Research Laboratory, Gazi University, Teknikokullar, 06500 Ankara, Turkey
2
Department of Chemistry, Faculty of Sciences, Gazi University, Teknikokullar, 06500 Ankara, Turkey
Among these methods, adsorption is a preferable method for the removal of hazardous pollutants using adsorbents due to its simplicity, low cost, and effectiveness. The interactions between hazardous pollutants and adsorbents could be primarily by ion-exchange, hydrogen bonding, hydrophobic, and the combining forces of van der Waals interactions (Arica et al. 2017; Bayramoglu et al. 2017; Xu et al. 2020; Wu et al. 2012). Different adsorbents such as ion-exchange resins (Bayramoglu et al. 2020), composite adsorbents, modified clay minerals (Alardhi et al. 2020), and polymers (Neolaka et al. 2020; Bayramoglu and Arica 2013; Khan and Husain 2019; Shabnam et al. 2019; Zhou et al. 2011) have been u
Data Loading...
