Our work reports the hydrothermal
synthesis of a bimetallic composite
CoMoS, followed by the addition of cellulose fibers and its subsequent
carbonization under Ar atmosphere (CoMoS@C). For comparison, CoMoS
was heat-treated under the same conditions and referred as bare-CoMoS.
X-ray diffraction analysis indicates that CoMoS@C composite matches
with the CoMoS
4
phase with additional peaks corresponding
to MoO
3
and CoMoO
4
phases, which probably arise
from air exposure during the carbonization process. Scanning
electron microscopy images of CoMoS@C exhibit how the CoMoS material
is anchored to the surface of carbonized cellulose fibers. As anode
material, CoMoS@C shows a superior performance than bare-CoMoS. The
CoMoS@C composite presents an initial high discharge capacity of ∼1164
mA h/g and retains a high specific discharge capacity of ∼715
mA h/g after 200 cycles at a current density of 500 mA/g compared
to that of bare-CoMoS of 102 mA h/g. The high specific capacity and
good cycling stability could be attributed to the synergistic effects
of CoMoS and carbonized cellulose fibers. The use of biomass in the
anode material represents a very easy and cost-effective way to improve
the electrochemical Li-ion battery performance.
Herein we present a modified iodine clock experiment which replaces starch with cellulose paper. This provides the reaction with a white solid surface in which color change can be clearly observed and reduces reagent amounts required to 540 μL per group. After data acquisition, students are required to calculate reaction orders and the reaction constant k, culminating in their ability to discern the rate equation for this reaction. This experiment is ideal for teaching kinetics in high school and undergraduate settings, particularly if liquid waste disposal is not readily available or if high importance is placed upon minimizing their environmental impact.
While extensive work has been done on the generation of adsorbents by carbonization of large polymeric structures, few works are currently available for the use of monomeric carbon molecules as precursors during carbonization. In this work we report the formation of a carbon adsorbent material from the carbonization of glucose in the presence of zinc oxide (ZnO) nanoparticle templates. Carbonization at 1,000 °C under inert atmosphere yields a product with BET surface area of 1,228.19 m2/g and 14.77 nm average pore diameter. Adsorption capacities against methylene blue, 2-naphthol and bisphenol-A at pH 7 were found to be 539 mg/g, 737 mg/g and 563 mg/g, respectively. Our material demonstrates a strong fit with the Langmuir isotherm, and adsorption kinetics show regression values near unity for the pseudo-second order kinetic model. A flow adsorption column was implemented for the remediation of tap water containing 20 mg/L methylene blue and found to quantitatively purify 11.5 L of contaminated water.
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