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Synthesis of Amorphous MnFe@SBA Composites for Efficient Adsorptive Removal of Pb from Aqueous Solution
The extensive release of water contaminated with lead (Pb(II)) and antimony (Sb(V)) constitutes a serious threat to the human living environment and public health, necessitating immediate attention. In this study, a novel MnFe@SBA composite was synthesized using the hydrothermal method through the in situ growth of MnFe[sub.2]O[sub.4] on SBA-15. The MnFe@SBA exhibits an amorphous structure with a high specific surface area of 405.9 m[sup.2]/g and pore sizes ranging from 2 to 10 nm. Adsorption experiments demonstrated that MnFe@SBA removed over 99% of Pb(II) and 80% of Sb(V) within 120 min at initial concentrations of 10 mg/L, whereas both MnFe[sub.2]O[sub.4] and SBA-15 exhibited poor adsorption capacities. Additionally, the MnFe@SBA displayed excellent tolerance towards coexisting cations, including Na[sup.+], K[sup.+], Mg[sup.2+], Ca[sup.2+], Zn[sup.2+], Ni[sup.2+], and Cd[sup.2+], as well as anions such as Cl[sup.−], NO[sub.3] [sup.−], CO[sub.3] [sup.2−], and PO[sub.4] [sup.3−]. The adsorption behavior of Pb(II) onto MnFe@SBA was satisfactorily described by the pseudo-second-order kinetic model and the Freundlich isotherm, while the adsorption of Sb(V) was well-fitted by the pseudo-second-order kinetic model and the Langmuir isotherm. At 318 K, the maximum adsorption capacities of MnFe@SBA for Pb(II) and Sb(V) were determined to be 329.86 mg/g and 260.40 mg/g, respectively. Mechanistic studies indicated that the adsorption of Pb(II) and Sb(V) onto MnFe@SBA involved two primary steps: electrostatic attraction and complexation. In conclusion, the MnFe@SBA is anticipated to serve as an ideal candidate for efficient removal of Pb(II) and Sb(V) from contaminated water.
Journal Article
Carbon dioxide capture : an effective way to combat global warming
This topical brief summarizes the various options available for carbon capture and presents the current strategies involved in CO₂ reduction. The authors focus on current CO₂ capture technologies that facilitate the reduction of greenhouse gas (CO₂) emissions and reduce global warming. This short study will interest environmental researchers, teachers and students who have an interest in global warming.
Book
Mechanochemical Synthesis of MOF-303 and Its COsub.2 Adsorption at Ambient Conditions
Metal–organic structures have great potential for practical applications in many areas. However, their widespread use is often hindered by time-consuming and expensive synthesis procedures that often involve hazardous solvents and, therefore, generate wastes that need to be remediated and/or recycled. The development of cleaner, safer, and more sustainable synthesis methods is extremely important and is needed in the context of green chemistry. In this work, a facile mechanochemical method involving water-assisted ball milling was used for the synthesis of MOF-303. The obtained MOF-303 exhibited a high specific surface area of 1180 m[sup.2]/g and showed an excellent CO[sub.2] adsorption capacity of 9.5 mmol/g at 0 °C and under 1 bar.
Journal Article
Adsorption of Cs on Al.sub.0.5Ga.sub.0.5N surface doped with Mg
The first-principles was employed to calculate the adsorption of Cs on (2 x 2) Al(Mg).sub.0.5Ga.sub.0.5N and Al.sub.0.5 Ga(Mg).sub.0.5N surfaces using density-functional theory within a plane-wave ultrasoft pseudopotential scheme. Then, the surface morphology, stability, work functions and Cs adsorptions of Al(Mg).sub.0.5Ga.sub.0.5N and Al.sub.0.5 Ga(Mg).sub.0.5N surfaces were investigated. The results reveal that Al(Mg).sub.0.5Ga.sub.0.5N surface with Mg in the first layer was more suitable for ultraviolet cathode. The most stable adsorption site for adsorption of Cs on the Al(Mg).sub.0.5Ga.sub.0.5N surface was found on N top. With the increase of Cs coverage, the interaction between Cs and atoms in the first layer of surface and that between Cs and Cs was enhanced, the surface dipole moment increased, the work function decreased, the carrier concentration and the absorption in visible light increased. When Cs coverage was greater than 0.5ML, the adsorption of Cs reached saturation, the deformation of surface structure appeared, the adsorption in visible light was greater than that in UV, and the surface was no longer suitable for UV detection. The results show that 0.5ML is the turning point of Cs coverage for the surface doped with Mg. Graphical abstract
Journal Article
Adsorption of Cs on Al.sub.0.5Ga.sub.0.5N
The first-principles was employed to calculate the adsorption of Cs on (2 x 2) Al(Mg).sub.0.5Ga.sub.0.5N and Al.sub.0.5 Ga(Mg).sub.0.5N surfaces using density-functional theory within a plane-wave ultrasoft pseudopotential scheme. Then, the surface morphology, stability, work functions and Cs adsorptions of Al(Mg).sub.0.5Ga.sub.0.5N and Al.sub.0.5 Ga(Mg).sub.0.5N surfaces were investigated. The results reveal that Al(Mg).sub.0.5Ga.sub.0.5N surface with Mg in the first layer was more suitable for ultraviolet cathode. The most stable adsorption site for adsorption of Cs on the Al(Mg).sub.0.5Ga.sub.0.5N surface was found on N top. With the increase of Cs coverage, the interaction between Cs and atoms in the first layer of surface and that between Cs and Cs was enhanced, the surface dipole moment increased, the work function decreased, the carrier concentration and the absorption in visible light increased. When Cs coverage was greater than 0.5ML, the adsorption of Cs reached saturation, the deformation of surface structure appeared, the adsorption in visible light was greater than that in UV, and the surface was no longer suitable for UV detection. The results show that 0.5ML is the turning point of Cs coverage for the surface doped with Mg.
Journal Article
High capacity adsorption of iodine gas by Ag.sup.0@C/SiO.sub.2 derived from rice husk: synergistic effect between C/SiO.sub.2 supports and Ag.sup.0 sites
A series of Ag.sup.0@C/SiO.sub.2 adsorbents were prepared using rice husk-based C/SiO.sub.2 as supports and applied to capture iodine gas. The results demonstrated that 50%Ag.sup.0@C/SiO.sub.2 reached a record high iodine adsorption capacity (788 ± 25 mg/g) due to the synergistic effect between C/SiO.sub.2 supports and Ag.sup.0 sites. The adsorption data of Ag.sup.0@C/SiO.sub.2 can be better fitted with the pseudo first order and Langmuir models. The iodine adsorption process included the physical and chemical adsorption. The adsorption mechanism was that Ag.sup.0 reacted with I.sub.2 to form AgI. Owing to the excellent adsorption capacity, Ag.sup.0@C/SiO.sub.2 derived from rice husk could be promising iodine gas adsorbents.
Journal Article