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(searched for: doi:10.1021/acs.jced.0c00735)
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Masoumeh Sharifi, Azam Marjani, , Hamid Reza Shamlouei
Published: 1 June 2022
Journal of Nanostructure in Chemistry pp 1-14; https://doi.org/10.1007/s40097-022-00502-4

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Serkan Sayin
Türk Doğa ve Fen Dergisi, Volume 11, pp 70-75; https://doi.org/10.46810/tdfd.1036402

Abstract:
İki kaliksarene-fonksiyonlu biyopolimerler (kaliksaren-fonksiyonlu kitosan ve kaliksaren-fonksiyonlu selüloz) sentezlenmiş ve FTIR, TGA ve element analiz gibi teknikler kullanılarak uygun bir şekilde karakterize edilmişlerdir. Ayrıca, çeşitli pH lardaki anyon ekstraksiyon davranışları dikromat ve arsenat anyonlarına karşı incelenmiştir. Sonuçlar dikromat iyonuna karşı kaliksaren-fonksiyonlu kitosanın kaliksaren-fonksiyonlu selüloza göre daha büyük ekstraksiyon kabiliyetinin olduğunu gösterdi. İlginç bir şekilde, dikromat anyonuna karşı daha düşük bir ekstraksiyon verimliliği kaliksaren-fonksiyonlu selüloz ile elde edilmesine rağmen, arsenat anyon ektraksiyon sonuçları kaliksaren-fonksiyonlu selülozun kaliksaren-fonksiyonlu kitosana göre daha etkin iyonofor olduğunu gösterdi.
Saad S. M. Hassan, Ehab M. Abdel Rahman, Gehan M. El-Subruiti, Ayman H. Kamel, Hanan M. Diab
Published: 1 April 2022
Journal: ACS Omega
ACS Omega, Volume 7, pp 12342-12353; https://doi.org/10.1021/acsomega.2c00819

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Nida Shams Jalbani, , Shahabuddin Memon, , Asif Ali Bhatti
Journal of Dispersion Science and Technology pp 1-9; https://doi.org/10.1080/01932691.2022.2046043

Abstract:
Calixarenes are known as fascinated macromolecules due to their flexible structure that can be cast into different fields of application. These macromolecules have been used as quick and highly selective functional material for the extraction and separation of metal ions. This study explores metal ion removal efficiency of new calixarene coated silica resin from aqueous environment through solid phase extraction. The calixarene-coated silica resin (CCS resin) was synthesized and characterized by FTIR, SEM, XRD, EDS and BET. Static and dynamic adsorption experiments were followed to check the removal efficiency of CCS resin. Adsorption experiment shows that, CCS resin has strong potential for the removal of divalent and trivalent metal ions as compare to monovalent metal ions. Adsorption data have been evaluated by applying Langmuir, Freundlich, D-R models and Thomas dynamic adsorption models. The adsorption isotherm of the CCS resin agreed well with the Langmuir adsorption equation with regression coefficient of 0.99 and good monolayer adsorption capacities such as 3.22, 2.95, 3.04, 3.11, 2.81 and 2.82 (mol.g−1) for Hg2+ Pb2+ La3+ Cr3+ Al3+ and Fe3+ respectively. The D-R isotherm model suggests that the adsorption process follow ion exchange mechanism with mean sorption energy falls in the range of 9.0–16 KJ.mol−1. Moreover, the exhaustion capacity of column was calculated by using the Thomas model, which shows very small qo value with good fit to data (R2 =0.99). The thermodynamic and kinetic studies have also been performed, which reveals that the reaction is spontaneous and exothermic in nature and follows pseudo second-order kinetics. Graphical Abstract
Yong-Yuan Chen, Xi-Wen Lan, Hao Ren, Wen-Jie Li, Jun Chen, Xin-Yu Jiang,
Published: 4 October 2021
Journal of Environmental Chemical Engineering, Volume 9; https://doi.org/10.1016/j.jece.2021.106500

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, Hassan Ouachtak, Hassan Alhajri, , Ghassab Al-Mazaideh, ,
Published: 31 May 2021
Separation Science and Technology, Volume 57, pp 542-554; https://doi.org/10.1080/01496395.2021.1931326

Abstract:
Chemical modification of chitosanwas successfully carried out using 2,3-dihydroxy-benzaldehyde by a chemical condensation reaction. Fourier transform infrared (FTIR), Scanning electron microscopy (SEM), Brunauer–Emmett–Teller (BET) surface area,Thermal gravimetric analysis (TGA), and X-Ray Diffraction methods were performed for characterization of the chitosan-derived Schiff base adsorbent material. The prepared adsorbent’s efficiency in removing Rhodamine B dye from aqueous solution was explored, and experimental data were analyzed using isothermal and kinetic models. The BET surface area of chemically modified chitosan was greatly enhanced 125.8 m2g−1 with mesoporous characteristics. The maximum uptake was recorded at pH 8, while the maximum removal capacity was 233.4 mg g−1(25°C). The kinetic data were better fitted using nonlinear pseudo-first-order.
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