Capture and Reversible Storage of Volatile Iodine by Novel Conjugated Microporous Polymers Containing Thiophene Units

Abstract

Conjugated microporous polymers having thiophene building blocks (SCMPs), which originated from ethynylbenzene monomers with 2,3,5-tribromothiophene, were designedly synthesized through Pd(0)/CuI catalyzed Sonogashira-Hagihara cross-coupling polymerization. The morphologies, structure and physicochemical properties of the as-synthesized products were characterized through scanning electron microscope (SEM), thermogravimeter analysis (TGA), (13)C CP/MAS solid state NMR and Fourier transform infrared spectroscope (FTIR) spectra. Nitrogen sorption-desorption analysis shows that the as-synthesized SCMPs possesses a high specific surface area of 855 m(2) g(-1). Because of their abundant porosity, π-conjugated network structure, as well as electron-rich thiophene building units, the SCMPs show better adsorption ability for iodine and a high uptake value of 222 wt % was obtained, which can compete with those nanoporous materials such as silver-containing zeolite, metal-organic frameworks (MOFs) and conjugated microporous polymers (CMPs), etc. Our study might provide a new possibility for the design and synthesis of functional CMPs containing electron-rich building units for effective capture and reversible storage of volatile iodine to address environmental issues.

Flexible and UV Resistant Films Based on Thiophene‐Substituted Conjugated Microporous Polymers Bearing Alkyl Chains: Tuning of Rigidity into Soft

“…The SCMPs were synthesized from acetylenylbenzene and dibromothiophene with palladium catalyzed Sonogashira–Hagihara crosscoupling polycondensation (Scheme ), which was a reliable approach proved by previous work to construct CMPs . The representative molecular structures of SCMPs are shown in Scheme .…”

“…Among these mentioned POPs, CMPs are usually synthesized using metal‐catalyzed crosscoupling chemistry to form 3D networks with extended π‐conjugation. Owing to their finely tuned porosity, larger surface areas, high thermal and chemical stability (thermal decomposition temperature greater than 300 °C under nitrogen atmosphere) originated from rigid π‐conjugated structure, CMPs have gained wide attention due to their various potential applications such as gas storage, hydrogen production, catalysis, supercapacitors, light harvesting, iodine capture, sensors, separation, and so on.…”

Nitrogen-doped porous carbon nanoparticle derived from nitrogen containing conjugated microporous polymer as high performance lithium battery anode

“…These specific structures make CMP possesses high chemical, thermal stability and desirable porous structure. Therefore, CMP is widely applied in various domains such as electrodes [7,25,26], catalysis [27], carbon dioxide capture [28] and volatile iodine capture [29,30], etc. More interesting, CMP is the ideal precursor to construct porous carbon because of their tuned porous structure and π-conjugated skeletons.…”

A Sponge‐Like 3D‐PPy Monolithic Material for Reversible Adsorption of Radioactive Iodine

“…To date, conventional inorganic absorbents such as activated carbon, 3D‐TiO 2 , zeolite have been employed for capture of radioactive iodine. Recent investigations on this field show that both the large pore size of porous absorbents and the strong affinity of absorbents to iodine molecules are two key factors for their iodine adsorption performance . Thus, the design of porous materials with suitable pore size and unique chemical functionality is the prime consideration.…”