3 research outputs found
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
Novel Graphene Oxide–Confined Nanospace Directed Synthesis of Glucose-Based Porous Carbon Nanosheets with Enhanced Adsorption Performance
Glucose-based
porous carbon nanosheets (GPCNS) were synthesized by an integrated
graphene oxide–confined nanospace directed KOH-activated process
and were applied as adsorbent for efficient removal of sulfamethazine
(SMZ). The effects of GO dosage on the structure, specific surface
area, and adsorption capacity of GPCNS-<i>x</i> were investigated.
The highest SMZ uptake of 820.27 mg g<sup>–1</sup> (298 K)
was achieved in glucose-based porous carbon nanosheets inherited from
using 1% GO relative to glucose (GPCNS-1). Also, the adsorption isotherms,
thermodynamics, and kinetics of SMZ onto GPCNS-1 were studied in detail.
In addition, the effects of ionic strength and solution pH on the
adsorption capacity of GPCNS-1 were also investigated, indicating
good environmental tolerance of GPCNS-1. Furthermore, regeneration
experiments showed that GPCNS-1 has good reproducibility and durability.
We believe that these graphene oxide–confined nanospace directed
KOH-activated process biomass-based carbon nanosheets are highly promising
as absorbents in the field of environmental protection
From Lignin to Three-Dimensional Interconnected Hierarchically Porous Carbon with High Surface Area for Fast and Superhigh-Efficiency Adsorption of Sulfamethazine
A novel
three-dimensional lignin-based interconnected hierarchical
porous carbon (3DLHPC) with very high specific surface areas (2784
m<sup>2</sup> g<sup>–1</sup>) and large pore volumes (1.382
cm<sup>3</sup> g<sup>–1</sup>) was prepared using sodium lignin
sulfonate as carbon precursor, via confinement carbonization, etching
silica-template, and <i>in situ</i> alkali activation, for
fast and super highly efficient removal of sulfamethazine (SMZ) antibiotics
from water. By batch adsorption experiments test, 3DLHPC showed a
strong adsorption affinity for SMZ with the maximum monolayer adsorption
capacity of 869.6 mg g<sup>–1</sup> at 308 K. Owing to this
well-defined 3D interconnected hierarchical porous structure, the
adsorption equilibrium could be reached within 30 min at 298 K. The
adsorption mechanism might be involved in van der Waals force, π–π
EDA interaction, electronic interaction, and hydrophobic interaction,
as well as hydrogen bonding interaction. Meanwhile, it was demonstrated
that 3DLHPC exhibited excellent regeneration ability, showing the
potential possibility for antibiotic wastewater treatments