Selenium functionalized magnetic nanocomposite as an effective mercury (II) ion scavenger from environmental water and industrial wastewater samples

Synthesis of a new chitosan- p-tert -butylcalix[4]arene polymer as adsorbent for toxic mercury ion

“…In this paper, we have synthesized a novel chitosan-ptert-butylcalix [4]arene polymer (CCP) as a highly efficient adsorbent for mercury ion (Hg 2+ ) removal from water. In fact, a lower rim diamine derivative of p-tert-butylcalix [4]arene has been cross-linked with chitosan chain by carbonyl diimidazole (CDI) as the linker. CDI forms a urea linkage between calix [4]arene diamine derivative and amine groups of the chitosan polymeric chain.…”

“…Here, we activated free amino groups of chitosan by using CDI as the linker to afford compound 6. Then, 1,3-diamine derivative of p-tert-butylcalix [4]arene was added to the reaction mixture. Finally, the mixture was heated to obtain CCP.…”

“…There are several studies in which various calixarene-chitosan polymers have been introduced for adsorption of different chemicals such as heavy metal cations (Co 2+ , Hg 2+ , Cu 2+ , Cd 2+ , Pb 2+ , Ni 2+ and Cr 2 O 7 ) [45], di-n-butyl phthalate [46] and dyes [47]. Here, we report a new method for the immobilization of calix [4]arene onto the chitosan polymer. The new calixarene-chitosan polymer has been characterized and evaluated for Hg 2+ ions adsorption in the aqueous medium.…”

“…So, chemical modifications of chitosan could be a reasonable approach to improve the properties of chitosan as a superb adsorbent [25,36,37]. Calix [4]arenes are basket-like cyclic phenol formaldehyde tetramers that have been widely used in supramolecular chemistry. In fact, they are regarded as the third-generation host molecules, following crown ethers and cyclodextrins owing to their unique conical architecture [38,39].…”

Magnetic nanoadsorbents for micropollutant removal in real water treatment: a review

“…Pristine magnetic nanoadsorbents can be functionalized with diverse moieties to bring out their favorable adsorption characteristics . (Augusto et al 2019 ; Manyangadze et al 2020 ; Wu et al 2020 ; Dai et al 2020 ; Nnadozie and Ajibade 2020 ; Safari et al 2020 ; Bi et al 2021 ; You et al 2021 ; Aryee et al 2021 ), and also increase their stability relative to oxidation with improved selectivity for one specific metal ion (Wadhawan et al 2020 ). However, functionalized magnetic nanoadsorbents can be very expensive, and this economic feature limits their use in water purification and wastewater treatment processes at the industrial scale (Augusto et al 2019 ).…”