Carbonaceous mesophase (CM) is an important precursor
of carbon
materials. Its structure, preparation conditions, and post-treatment
conditions determine the structure and properties of carbon mesophase
materials. However, conventional methods for the preparation of CMs
are complex and require high temperatures above 400 °C. In this
paper, a low-temperature solvothermal (LTS) method for obtaining CMs
with high-temperature coal tar as the raw material and ethanol as
the solvent is presented. With the LTS method, the required temperature
is reduced from 410 to 230 °C, and the process of preparing pitch
by tar rectification is simplified. This method thus provides a low-energy
and environmentally friendly alternative to conventional CM synthesis
methods. The resulting CMs by the LTC method exhibit impressive adsorption
and electrochemical properties, making them highly suitable for a
wide range of applications. After activation, the CMs exhibit a significant
specific surface area of 1049.336 m2/g. Additionally, they
possess mesopores with an average size of 3.620 nm, which enables
them to effectively adsorb and remove up to 98.25% of methylene blue.
The theoretical maximum adsorption capacity of the CMs for methylene
blue is 364.71 mg/g. Additionally, the activated CMs demonstrate excellent
electrochemical properties. The cyclic stability of the material was
evaluated, and the specific capacitance retention rate was 96.69%
after 2000 cycles. These findings highlight the potential of this
low-temperature solvent thermal method for synthesizing high-performance
CMs and their potential use in adsorption and electrochemical applications.
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