Fabrication of ultra-thin MgAl layered double oxide by cellulose templating and its immobilization effect toward heavy metal ions: cation-exchange and deposition mechanism

Ultrasonic-assisted preparation of ultrafine Pd nanocatalysts loaded on Cl−-intercalated MgAl layered double hydroxides for the catalytic dehydrogenation of dodecahydro-N-ethylcarbazole

“…The chemical state of O on the catalyst surface was further analyzed, as shown in Fig. 7 , the spectrum of O 1s can be fitted to four peaks at the binding energies of 530.0, 531.2, 532.2 and 533.1 eV [54] , which corresponded to Al-O, Mg-O, M−OH and H 2 O. By calculating and comparing the proportion of the M−OH peak area in each catalyst in Table 2 , it was found that the M−OH content of Pd/LDHs-us prepared under different ultrasonic powers was lower than that of Pd/LDHs-c, which was due to the fact that the hydroxyl groups were excited to •H by ultrasound, then Pd 2+ was reduced, and at the same time the coordination effect between Pd and O was formed.…”

Efficient and Superstable Mineralization of Toxic Cd2+ Ions through Defect Engineering in Layered Double Hydroxide Nanosheets

“…Figure S10 revealed a uniform distribution of Cd, Mg, Al, B and O in the CdMgAl-12 h nanosheets. For CdMgAl-12 h (Figure S8), some weak diffraction peaks for phases such as Cd­(OH) 2 and CdCO 3 were observed along with the main CdAl-LDH phase, proving that precipitation partly contributed to the outstanding Cd 2+ removal properties of MgAl-mono-350. ,, Furthermore, the (110) diffraction peak at around 60° shifted to lower angles as the Cd uptake increased. From the lattice parameter a = 2 d (110) , it was concluded that in-plane tensile strain or positive strain around ab -plane of LDH lattice occurred during mineralization (the lattice parameter a increased from 0.302 nm for MgAl-LDH-350 to 0.328 nm for CdMgAl-LDH, corresponding to a tensile strain of 8.6%).…”

“…Calcining LDHs at temperatures above 300 °C leads to the dehydroxylation of the positively charged LDH sheets and partial or total collapse of the multilayered structure (a route commonly used nowadays to obtain mixed-metal oxide catalysts). We hypothesized that by calcining monolayer LDH nanosheets at low temperatures (∼350 °C), it should be possible to create LDH materials exposing abundant defect sites (i.e., oxygen vacancies), thereby significantly improving the Cd 2+ removal capacity of LDH-based mineralizers. ,− …”

An Active Bio-Based Food Packaging Material of ZnO@Plant Polyphenols/Cellulose/Polyvinyl Alcohol: DESIGN, Characterization and Application

“…The most stable one among each type is illustrated in Figure 1 c. The calculated free energy of forming isomers ranged from −0.14 to −0.02 eV, which indicates that the reaction was exothermic and spontaneous. Associated with optimized geometrical results, hydrogen bonds are attributed to the interfacial interaction between PPL and PVA in the composite [ 45 , 46 , 47 ]. For example, the short interfacial H PPL ··O PVA distances were calculated to be 1.613, 1.611 and 1.758 Å for the three isomers of PPL/PVA, which have bond orders of 0.22~0.16; moreover, the related O PPL −H PPL ··O PVA angles were close to 180°.…”