2 research outputs found
Significantly Enhanced Photocatalytic Performance of the g‑C<sub>3</sub>N<sub>4</sub>/Sulfur-Vacancy-Containing Zn<sub>3</sub>In<sub>2</sub>S<sub>6</sub> Heterostructure for Photocatalytic H<sub>2</sub> and H<sub>2</sub>O<sub>2</sub> Generation by Coupling Defects with Heterojunction Engineering
Light-driven
splitting of water to produce H2 and reduction
of molecular oxygen to synthesize H2O2 from
water are the emerging environmentally friendly methods for converting
solar energy into green energy and chemicals. In this paper, vacancy
defect and heterojunction engineering effectively adjusted the conduction
band position of Zn3In2S6, enriched
the electron density, broadened the optical absorption range, increased
the specific surface area, and accelerated the charge carrier transfer
and separation of g-C3N4/sulfur-vacancy-containing
Zn3In2S6 (CN/Vs-ZIS) heterostructures.
As a result, all of the CN/Vs-ZIS heterostructures possessed greatly
enhanced photocatalytic activities and the optimized sample 2CN/Vs-ZIS
exhibited the highest visible-light photocatalytic performance. The
rate of generation of H2 of 2CN/Vs-ZIS under visible light
(λ > 420 nm) was 6.55 mmol g–1 h–1, which was 1.76 and 6.06 times higher than those of Vs-Zn3In2S6 and g-C3N4, respectively,
and the apparent quantum yield (AQY) was 18.6% at 420 nm. Meanwhile,
the 2 h yield of H2O2 of 2CN/Vs-ZIS was 792.02
μM, ∼4.72 and ∼6.04 times higher than those of
pure Vs-Zn3In2S6 and g-C3N4, respectively. The enhanced reaction mechanisms for
the production of photocatalytic H2 and H2O2 were also investigated. This work undoubtedly demonstrates
that the synergistic effects of defect and heterojunction engineering
will be the great promise for improving the photocatalytic efficiency
of Zn3In2S6-based materials
Fe<sub>3</sub>C/Fe/C Magnetic Hierarchical Porous Carbon with Micromesopores for Highly Efficient Chloramphenicol Adsorption: Magnetization, Graphitization, and Adsorption Properties Investigation
Here, the magnetic hierarchical porous
carbon (MHPC) with micromesopores was first prepared using ethylenediaminetetraacetic
acid tripotassium (EDTA-3K) and iron nitrate by simultaneous magnetization/activation
method. The optimal product was MHPC-20 with a high graphitization,
which possessed a large <i>S</i><sub>BET</sub> (1688 m<sup>2</sup> g<sup>–1</sup>) and saturation magnetization (3.679
emu g<sup>–1</sup>). As expected, MHPC-20 had a very high maximum
adsorption capacity (534.2 mg g<sup>–1</sup>) toward chloramphenicol
(CAP) from water solution at 298 K with a positive correlation between <i>S</i><sub>BET</sub> and adsorption amount. Additionally, MHPC-20
had a fast adsorption kinetic, only 250 min, and isothermal and kinetics
data were well fitted by Langmuir and pseudo-second-order kinetic
models, respectively. Moreover, the effect of ion strength, solution
pH, and humic acid on CAP adsorption onto MHPC-20 were investigated,
indicating a better stability. Besides, MHPC-20 showed good reusability
and excellent magnetic separation performance, which implied MHPC-20
as a candidate could be applied in various complex wastewater environments