Synthesis, characterization and adsorption studies of a novel triptycene based hydroxyl azo- nanoporous polymer for environmental remediation. Issue 2 (April 2020)

• Record Type: Journal Article
• Authors: Ansari, Mosim; Alam, Akhtar; Bera, Ranajit; Hassan, Atikur; Goswami, Santu; Das, Neeladri
• Is Part Of: Journal of environmental chemical engineering. Volume 8:Issue 2(2020)
• Publication Date: 2020-04
• Subjects: POP porous organic polymer -- TBHAP Triptycene-based-Hydroxyl-Azo-Polymer -- I2@TBHAP iodine loaded Triptycene-based-Hydroxyl-Azo-Polymer -- Qe equilibrium adsorption capacity -- Qm maximum adsorption capacities -- Qst isosteric heats of adsorption -- Ce equilibrium concentration -- RB rhodamine B -- MB methylene blue -- MO methyl orange -- OG orange G -- 3D three-dimensional -- IFV internal free volume -- BET Brunauer-Emmett-Teller -- CP-MAS cross-polarization magic angle spinning -- EDAX energy dispersive X-ray analysis -- FESEM field emission scanning electron microscopy -- FTIR fourier-transform infrared spectroscopy -- g gram -- mg milligram -- mmol millimol -- mol mole -- nm nanometer -- PSD pore size distribution -- PXRD powder X-ray diffraction -- SABET BET surface area -- Td thermal degradation temperature -- TGA thermogravimetric analysis -- UV-Vis ultraviolet–visible -- NMR nuclear magnetic resonance; Triptycene -- Porous polymer -- CO2 capture -- Iodine-vapor uptake -- Water purification and dye adsorption; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2019.103558
• Languages: English
• ISSNs: 2213-2929

Abstract

Graphical abstract: Highlights: A facile and green synthesis of a new triptycene based nanoporous polymer (TBHAP ). TBHAP has high SABET (824 m 2 g −1 ) and CO2 uptake (145.8 mg g −1 at 273 K, 1 bar). CO2 /N2 selectivity of TBHAP is reasonably high (84 measured at 273 K). TBHAP rapidly captures cationic dye from a binary mixture of cationic/anionic dyes. TBHAP efficiently and reversibly captures iodine (up to 1880 mg g −1 ). Abstract: Gradual increase in CO2 emission due to energy production from fossils fuels is a major contributor to global warming. Alternatively, "carbon free" nuclear energy generates radioactive and carcinogenic iodine vapors. Thus, the need to develop efficient sorbents for capture of CO2 and I2 is justified. Herein, we report a Triptycene-based-Hydroxyl-Azo-Polymer (TBHAP ) derived from relatively inexpensive hydroquinone (one of the two monomers) and using water as a solvent. TBHAP is thermally stable and nanoporous with high surface area (SABET up to 824 m 2 g −1 ). The presence of permanent porosity (due to triptycene), π-rich cavities (from abundant arene rings) and active functional groups [phenolic−OH and azo (NN)] in the polymeric network of TBHAP makes it effective for reversible iodine (188 wt%), H2 (8.9 mg g −1 : 77 K, 1 bar) and CO2 (145 mg/g: 273 K, 1 bar) uptake with moderately high CO2 /N2 selectivity (84 at 273 K). TBHAP is also an effective and selective adsorbent for toxic cationic dyes [Methylene blue (Qm = 250 mg g −1 ) and Rhodamine B (Qm = 588 mg g −1 )] from an aqueous solution containing binary mixtures of cationic/anionic dyes. Thus, TBHAP is a versatile porous material with various applications in the domain of environmental remediation.