In the present study, magnetic cellulose/graphene oxide composite (MCGO) was prepared as a novel adsorbent to dispose of dye wastewater. The morphology and chemical structure of the MCGO composite were characterized by the Fourier transform infrared spectrometer (FT-IR), X-ray diffraction (XRD), and scanning electronic microscope (SEM). The adsorption of methylene blue (MB) onto MCGO was studied in relation to initial concentration of MB, contact time, adsorbent dose, and pH value of solution. Adsorption kinetics and the equilibrium adsorption isotherm were fitted by a pseudo-secondorder kinetic model and Langmuir isotherm, respectively. The thermodynamic parameters indicated that the adsorption was spontaneous, favorable, and exothermic in nature. Furthermore, MCGO was very stable and can easily be recycled. The adsorption efficiency of MCGO was still over 89% after recycling for five times.
In
this work, the pressure-swing distillation process is extended
to separate the pressure-insensitive binary azeotropes by using suitable
entrainers. Design and control of new pressure-swing distillation
for separating pressure-insensitive maximum boiling phenol/cyclohexanone
azeotrope using acetophenone as a heavy entrainer are investigated
using Aspen Plus and Aspen Dynamics. Rigorous steady-state simulations
are run for both fully and partially heat-integrated processes and
a comparison of these two configurations is made. It is revealed that
the partially heat-integrated process is more competitive than the
fully heat-integrated one from the economical viewpoint. Two temperature
control structures and one composition/temperature cascade control
scheme are proposed to handle the feed flow rate and feed composition
disturbances. It is indicated that the column operating at higher
pressure cannot be perfectly controlled by the two temperature control
schemes because of the existence of an intermediate nonkey component.
A composition/temperature cascade control structure is proposed to
cope with this control problem and a robust control is achieved.
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