Defense Date

2017

Document Type

Dissertation

Degree Name

Doctor of Philosophy

Department

Mechanical and Nuclear Engineering

First Advisor

Hani El-Kaderi

Abstract

The design and synthesis of porous materials attracted great attention recently because of their potential use in many fields like clean energy and environmental protection. Herein, we introduced new synthetic approaches for the preparation for porous carbons and organic polymers for selective CO2 and iodine capture application. Regarding CO2 capture application, Two new

series of porous carbons (PYDCs) and (TRI-Ps) were synthesized by thermally activating Pyrazole and Triazolo Pyridine monomers respectively using KOH as a catalyst, which leads to porous carbon. PYDCs exhibit high surface area according to Brunauer–Emmett–Tellertheory (SABET = 1266–2013 m2 g−1), high CO2 Isosetric heat Qst(33.2-37.1 kJ/mol) and significantly high CO2 uptakes 8.59mmol g−1 (1bar) at 273k. The reported porous carbons also show significantly high adsorption selectivity for CO2/N2 (128) and CO2/CH4 (13.4) according to Ideal adsorbed solution theory (IAST) calculation using pure gas isotherms at 298 K. TRI-Ps exhibit high surface area (SABET=1852- 2917 m2 g−1) with a combination of mesoporous and microporous pores. TRI-Ps exhibit CO2 capture capacity of 6.98mmol g−1 at 1 bar and 273K. The development of majority of microporous offered a high CO2 storage capacity to TRI-Ps. High CO2 uptake achieved as a result of preferable pore size, surface area, and high oxygen content and high Qst values. Based on IAST calculation, high CO2/N2 selectivity (113.9) at 298K was achieved.

Regarding iodine capture application, two new series of porous organic polymers Benzamidizole Linked Polymers (BILPs) and nitrogen rich porous Polymers (NRPPs) were synthesized and tested. Iodine capture, sorption isotherm and kinetics of adsorption were studied. BILPs exhibit iodine uptake capacity of 227.8 wt.% and 202.8 wt. % for BILP-A and BILP-B respectively. BILP-A shows ability of releasing 95.8% of captured iodine, while, BILP-B released 82.22%. Sorption curves were fitted by Freundlich equation indicating a heterogeneity of adsorption process on the surface. NRPPs exhibit iodine capacity of 192.35 wt.% and 222.35 wt. % for NRPP-1 and NRPP-2 respectively. NRPPs shows ability of releasing the majority of adsorbed Iodine. Sorption curves were fitted by Langmuir equation indicating a heterogeneity of adsorption process on the surface.

Rights

© The Author

Is Part Of

VCU University Archives

Is Part Of

VCU Theses and Dissertations

Date of Submission

12-13-2017

Available for download on Sunday, December 11, 2022

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