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Shahzad Kashif,Amin Arslan Ahmed 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.5
In this paper, the optimal planning of Distributed Energy Storage Systems (DESSs) in Active Distribution Networks (ADNs) has been addressed. As the proposed problem is mixed-integer, non-convex, and non-linear, this paper has used heuristic optimization techniques. In particular, fi ve optimization techniques namely Genetic algorithm, Particle swarm optimization, Tabu search, Simulated annealing, and Pattern search optimization techniques have been applied to optimal planning of DESS. The problem has been formulated to consider distributed storage units’ optimal locations and sizes to be placed in an ADN while respecting the constraints of the system. The problem has been addressed on two levels. In the fi rst level, an optimization technique is applied for DESS planning to determine the optimal solution and in the second level, the fi tness value of this solution is evaluated by solving a daily AC Optimal Power Flow (OPF) problem. Simulations have been done for the IEEE 34 and IEEE 123 nodes network to demonstrate and compare the effi ciency of diff erent optimization techniques. The comparison of these optimization techniques has shown that Particle swarm optimization and Tabu search optimization (with a particular value of tabu tenure found by hit and trial) have performed better in fi nding the lowest DESS location corresponding to minimum fi tness value as compared to other optimization techniques both for IEEE 34 nodes and IEEE 123 nodes network
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Mercuric ion capturing by recoverable titanium carbide magnetic nanocomposite
Shahzad, Asif,Rasool, Kashif,Miran, Waheed,Nawaz, Mohsin,Jang, Jiseon,Mahmoud, Khaled A.,Lee, Dae Sung Elsevier 2018 Journal of hazardous materials Vol.344 No.-
<P><B>Abstract</B></P> <P>Two-dimensional metal carbides and nitrides (MXenes) have attracted increasing attention for application in water/wastewater treatment. The functionalization of MXenes to increase their stability while demonstrating high pollutant removal can facilitate sustainable water/wastewater treatment processes. In this study, the highly stable magnetic titanium carbide (<I>Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB>)</I> MXene nanocomposite (<I>MGMX</I> nanocomposite) was successfully synthesized through a facile hydrothermal approach and was tested for aqueous-phase adsorptive removal of mercuric ions. The synthesized <I>MGMX</I> nanocomposite was studied using characteristic analyses, showing high stability as revealed by zeta-potential analysis and dynamic light-scattering technique. The <I>MGMX</I> nanocomposite presented excellent Hg(II) removal in a wide range of pH conditions, and an exceptional maximum experimental Hg(II) uptake capacity of 1128.41mgg<SUP>−1</SUP> was observed. The adsorption behavior was investigated using the Redlich-Peterson adsorption isotherm, pseudo second-order kinetics, and thermodynamics models. In the adsorption/desorption investigation, the <I>MGMX</I> nanocomposite was reusable for up to five cycles of adsorption/desorption. The stability, hydrophilic nature, available adsorptive surfaces, and easy separation after reaction make the <I>MGMX</I> nanocomposite an efficient sorbent for the removal of toxic Hg(II) for water purification.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hybrid nanocomposites were synthesized using <I>Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> </I> MXene and Fe<SUB>2</SUB>O<SUB>3</SUB> nanoparticles. </LI> <LI> <I>MGMX</I> presented the highest removal capacity for Hg(II) among other 2D materials. </LI> <LI> <I>MGMX</I> adsorbed ∼99.9% Hg(II) in the existence of background metal ions. </LI> <LI> Fe<SUB>2</SUB>O<SUB>3</SUB> nanoparticles in <I>MGMX</I> played a significant role in Hg(II) adsorption. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Shahzad, Asif,Rasool, Kashif,Nawaz, Mohsin,Miran, Waheed,Jang, Jiseon,Moztahida, Mokrema,Mahmoud, Khaled A.,Lee, Dae Sung Elsevier 2018 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.349 No.-
<P><B>Abstract</B></P> <P>A simple hydrothermal treatment process was used for the fabrication of a Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> (MXene) nanosheet-based hybrid photocatalyst. The chemical composition of the MXene and its derivatives (nanosize {0 0 1} facets of TiO<SUB>2</SUB> in Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> (001-T/MX)), as well as the structural properties and morphology of the as-prepared photocatalyst, were well characterised. The heterostructure of the as-prepared photocatalyst was obtained by controlled oxidation action via the Schottky junction formed between TiO<SUB>2</SUB>-MXene interfaces. The adsorption/photocatalytic degradation abilities of the pristine MXene and the as-synthesised 001-T/MX nanocomposite for carbamazepine (CBZ) were investigated. The determined <I>K<SUB>app</SUB> </I> value of CBZ under ultraviolet light was 0.0304 min<SUP>−1</SUP>, higher than that under natural solar light, and the degradation capacity was strongly controlled under acidic conditions (pH 3.0–5.0). During the photocatalytic degradation, <SUP> </SUP>OH and <SUP> </SUP>O<SUB>2</SUB> attacked the CBZ molecule; detailed degradation pathways were proposed accordingly. The novel heterojunction 001-T/MX exhibited excellent applicability for CBZ decomposition.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A simple hydrothermal process is used for the fabrication of Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> (MXene) nanosheets. </LI> <LI> Ti<SUB>3</SUB>C<SUB>2</SUB>T<SUB>x</SUB> MXene-based heterojunction (001-T/MX) can be used as a photocatalyst. </LI> <LI> Carbamazepine (CBZ) degradation under direct sunlight and ultraviolet light is studied. </LI> <LI> T/MX photocatalyst degrades 98.67% CBZ under UV light irradiation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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