Polyaniline self‐assembled with DTPA: Facilely tuned morphology and properties

Abstract

The effects of pH profile and “soft template” during aniline chemical oxidative polymerization (COP) were investigated and evaluated simultaneously with diethylene triamine pentaacetic acid (DTPA) as a structural directing agent. Formation of PANI nanotubes and nanoparticles, smooth microspheres, and urchin‐like microspheres were illustrated by evaluating the pH profile during aniline COP while considering the “soft template” effects of DTPA. PANI nanosheets with two semicurled edges were found in the system producing nanotubes, which provides an evidence for the “curling mechanism” of PANI nanotube formation. With different pH profiles, chemical structures and aggregation structures of the as‐synthesized PANI micro/nanostructures are similar, whereas their conductivity, wettability, Cr (VI) adsorption, and electrochemical behaviors are distinct. The present study indicates that if properly conducted, pH profile adjustment is more effective than “soft template” to control the morphology and to optimize the performance of PANI micro/nanostructures. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42403.

Boosting Catalytic and Anti-fluorination Performance of the Ru/Vanadia–Titania Catalyst for the Oxidative Destruction of Freon by Sulfuric Acid Modification

“…In addition, O 1s, Cl 2p, Ti 2p, and V 2p XPS spectra of the samples are provided in Figure S6B–D,F,G, and their corresponding surface element compositions are summarized in Table S2. Each of the S 2p spectra could be divided into four components: the two components at binding energy (BE) = 167.8 and 168.9 eV were assigned to the S 2p 3/2 final state, and the other two components at BE = 168.7 eV (due to the surface −SO 3 – and HSO 4 – species) and 169.8 eV (due to the surface −SO 3 H species) were attributed to the S 2p 1/2 final state. , The S 2p 3/2 and S 2p 1/2 were ascribed to the final states of the surface S 4+ and S 6+ species, , respectively. The molar ratio (2.1) of (−SO 3 – and HSO 4 – )/–SO 3 H on the S-Ru/3DOM VTO sample was slightly higher than that (1.5) on the S-3DOM VTO sample; the former (−SO 3 – and HSO 4 – ) had a higher electron density than the −SO 3 H species, which indicates that the chemical environment of the surface sulfate species is altered due to the strong chemical interaction between surface sulfate and Ru NPs (Figure C).…”

“…Each of the S 2p spectra could be divided into four components: the two components at binding energy (BE) = 167.8 and 168.9 eV were assigned to the S 2p 3/2 final state, and the other two components at BE = 168.7 eV (due to the surface −SO 3 – and HSO 4 – species) and 169.8 eV (due to the surface −SO 3 H species) were attributed to the S 2p 1/2 final state. , The S 2p 3/2 and S 2p 1/2 were ascribed to the final states of the surface S 4+ and S 6+ species, , respectively. The molar ratio (2.1) of (−SO 3 – and HSO 4 – )/–SO 3 H on the S-Ru/3DOM VTO sample was slightly higher than that (1.5) on the S-3DOM VTO sample; the former (−SO 3 – and HSO 4 – ) had a higher electron density than the −SO 3 H species, which indicates that the chemical environment of the surface sulfate species is altered due to the strong chemical interaction between surface sulfate and Ru NPs (Figure C). Additionally, the (−SO 3 – and HSO 4 – )/–SO 3 H molar ratios decreased on S-Ru/3DOM VTO-used-with H 2 O (1.7) and S-Ru/3DOM VTO-used-without H 2 O (1.5), and their XPS peaks due to the surface S 4+ species were visible, indicating that the sulfate species might provide the electron transfer sites for the elimination of CFC-12 over the S-Ru/3DOM VTO sample (Figure S6E).…”