Preparation of activated carbon from spent catalyst with mercury by microwave‐induced CO₂ activation

Abstract

This study reported the regeneration of mercury‐loaded porous carbon catalyst utilized in the manufacture of PVC (Polyvinyl chloride) resin using the combined effect of microwave heating and CO2 purging. The porosity, functional, and surface chemistry was featured by means of low‐temperature nitrogen adsorption, scanning electron microscopy, Fourier‐transform infrared spectroscopy, Raman spectroscopy, and X‐ray photoelectron spectroscopy. The result showed that the iodine number, methylene blue adsorption, and yield of FMC were 791.64 mg/g, 270 mg/g, and 84.2%, respectively, under the best conditions. Additionally, the mercury removal rates were above 99.5% at different temperatures. The regenerated samples at different temperatures were characterized to assess their physical binding capability and chemisorption abilities, which further revealed the impact of regeneration temperature on the improvement in the porosity of the regenerated catalyst. The findings revealed the potential of microwave heating for the regeneration of FMCs.

Tubular Polypyrrole with Chloride Ion Dopants as an Ultrafast Organic Anode for High‐Power Lithium‐Ion Batteries

“…The bands at 866 cm −1 is attributed to C−H out‐of‐plane deformation vibrations of the ring. A weak characteristic peak at 692 cm −1 can be seen clearly, certifying the existence of C−Cl [34] . During the first cycling process, C−Cl bond cannot be seen when Li + ion insertion into PPy structure, while C−Cl bond appears when Li + ion extraction from PPy structure.…”

“…A weak characteristic peak at 692 cm À 1 can be seen clearly, certifying the existence of CÀ Cl. [34] During the first cycling process, CÀ Cl bond cannot be seen when Li + ion insertion into PPy structure, while CÀ Cl bond appears when Li + ion extraction from PPy structure. After 50 cycles, the weak CÀ Cl bond cannot be seen which may be attributed to the microstructure change of PPy.…”

Advances in Microwave Synthesis of Nanoporous Materials

“…[ 64 ] Therefore, employing alternative energy sources such as microwave irradiation can reduce the energy usage and other negative environmental impacts of synthesis processes, which is of high importance. In literature, there are many papers devoted to pyrolysis, [ 65–74 ] activation, [ 75–98 ] and even regeneration of spent carbons [ 99–106 ] under microwave radiation. Recently, excellent reviews were reported to summarize the main accomplishments in the microwave‐assisted synthesis of biomass‐derived porous carbons.…”

“…Porous carbons obtained via microwave‐assisted methods with their SSA values and potential applications are summarized in Table 4 . [ 65–122 ]…”