title: Development of high efficiency silica coated β-cyclodextrin polymeric adsorbent for the removal of emerging contaminants of concern from water.
abstract: This article reports the removal of several emerging contaminants (ECs) from water using novel adsorbent comprising of β-cyclodextrin (β-CD) coated on silica. Fourteen different adsorbents were synthesized under different experimental conditions using two different crosslinking agents (hexamethylene diisocyanate (HMDI) and epichlorohydrin (EPI)) and co-polymers (glycidoxypropyl trimethoxysilane (GPTS) and aminopropyl triethoxysilane (APTES). The adsorption capacities of the synthesized adsorbents were initially evaluated using 17β-estradiol, perfluorooctanoic acid (PFOA), and bisphenol-A (BPA) as adsorbates. The adsorbent prepared by using HMDI as crosslinking agent with DMSO as solvent was observed to perform the best, and removed more than 90% of 17β-estradiol, PFOA, and BPA. Furthermore, the β-CD loading on the ECs removal was studied which showed that the adsorbate removal increases with increase in loading of β-CD on the substrate. The best adsorbent was resynthesized in seven batches and its performance was reproducible for the removal of ten steroid hormones. The adsorbent showed very good regeneration potential for four successive adsorption-regeneration cycles to remove steroid hormones and PFOA. A plausible mechanism of adsorption is proposed. The synthesized best adsorbent is characterized using FTIR, HR-TEM, TGA and nitrogen adsorption analysis. The TGA results showed that the adsorbent has thermal stability of upto 300°C.
authors.affiliation: NSF IUCRC Water and Environmental Technology (WET) Center, Civil and Environmental Engineering, Temple University, 1947 N. 12th St, Philadelphia, PA 19122, USA.
authors.forename: Bikash
authors.initials: B
authors.lastname: Bhattarai
authors.affiliation: NSF IUCRC Water and Environmental Technology (WET) Center, Civil and Environmental Engineering, Temple University, 1947 N. 12th St, Philadelphia, PA 19122, USA.
authors.forename: M
authors.initials: M
authors.lastname: Muruganandham
authors.affiliation: NSF IUCRC Water and Environmental Technology (WET) Center, Civil and Environmental Engineering, Temple University, 1947 N. 12th St, Philadelphia, PA 19122, USA. Electronic address: rominder.suri@temple.edu.
authors.forename: Rominder P S
authors.initials: RP
authors.lastname: Suri
mesh_terms: D000327:Adsorption; D001559:Benzhydryl Compounds / Q000737:chemistry; D002210:Caprylates / Q000737:chemistry; D003485:Cyanates / Q000737:chemistry; D004811:Epichlorohydrin / Q000737:chemistry; D004958:Estradiol / Q000737:chemistry; D005466:Fluorocarbons / Q000737:chemistry; D010636:Phenols / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D011437:Propylamines; D012821:Silanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D047392:beta-Cyclodextrins / Q000737:chemistry*; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D002210:Caprylates; D003485:Cyanates; D004811:Epichlorohydrin; D004958:Estradiol; D005466:Fluorocarbons; D010636:Phenols; D011108:Polymers; D011437:Propylamines; D012821:Silanes; D012822:Silicon Dioxide; D014874:Water Pollutants, Chemical; D047392:beta-Cyclodextrins; C403136:3-glycidoxypropyltrimethoxysilane; C013606:methylene bis(4-cyclohexylisocyanate); C023036:perfluorooctanoic acid; C031215:betadex; C477625:amino-propyl-triethoxysilane; C006780:bisphenol A; D000098826:Bisphenol A Compounds
keywords: Adsorption; Emerging contaminant; Hybrid adsorbent; Water treatment; β-cyclodextrin