Designing of porous carbon system for CO2 uptake has attracted a plenty of interest due to the ever-increasing concerns about climate change and global warming. Herein, a novel N rich porous carbon is prepared by in-situ chemical oxidation polyaniline (PANI) on a surface of multi-walled carbon nanotubes (MWCNTs), and then activated with KOH. The porosity of such carbon materials can be tuned by rational introduction of MWCNTs, adjusting the amount of KOH, and controlling the pyrolysis temperature. The obtained M/P-0.1-600-2 adsorbent possesses a high surface area of 1017 m2 g−1 and a high N content of 3.11 at%. Such M/P-0.1-600-2 adsorbent delivers an enhanced CO2 capture capability of 2.63 mmol g−1 at 298.15 K and five bars, which is 14 times higher than that of pristine MWCNTs (0.18 mmol g−1). In addition, such M/P-0.1-600-2 adsorbent performs with a good stability, with almost no decay in a successive five adsorption-desorption cycles.
The
conversion of As(III) to As(V) in groundwater is an urgent
issue, owing to the higher mobility, stronger toxicity, and weaker
binding ability of As(III). In this work, the electrocatalytic oxidation
of As(III) was efficiently achieved with a facile and environmentally
benign method by using hierarchical MnO2-deposited TiO2 nanotube arrays (MnO2/TNAs) as the anode. The
electrocatalytic oxidation performance of the as-fabricated MnO2/TNA-coated anode was systematically investigated. The results
exhibited that such as-fabricated MnO2/TNAs had a high
oxidation efficiency of 90% at a low concentration of As(III) (1 mg
L–1). Furthermore, the reaction mechanism was systematically
studied by electron spin resonance and free radical capture experiments.
The oxidation of As(III) was accomplished via both direct oxidation
on the anode surface and indirect oxidation of the reactive oxygen
species. The highly efficient TNA-based anode offers a potentially
promising advanced material for electrochemical oxidation of trace
As(III) in the practical field.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.