Precise construction of isolated reactive centers on semiconductors with wellcontrolled configurations affords a great opportunity to investigate the reaction mechanisms in the photocatalytic process and realize the targeted conversion of solar energy to steer the charge kinetics for hydrogen evolution. In the current research, we decorated isolated Ni atoms on the surface of CdS nanowires for efficient photocatalytic hydrogen production. X-ray absorption fine structure investigations clearly demonstrate the atomical dispersion of Ni sites on the surface of CdS nanowires. Experimental investigations reveal that the isolated Ni atoms not only perform well as the real reactive centers but also greatly accelerate the electron transfer via direct Ni-S coordination. Theoretical simulation further documents that the hydrogen adsorption process has also been enhanced over the semi-coordinated Ni centers through electronic coupling at the atomic scale.
The solar-driven evolution of hydrogen from water using particulate photocatalysts is considered one of the most economical and promising protocols for achieving a stable supply of renewable energy. However, the efficiency of photocatalytic water splitting is far from satisfactory due to the sluggish electron-hole pair separation kinetics. Herein, isolated Mo atoms in a high oxidation state have been incorporated into the lattice of Cd 0.5 Zn 0.5 S (CZS@Mo) nanorods, which exhibit photocatalytic hydrogen evolution rate of 11.32 mmol g À 1 h À 1 (226.4 μmol h À 1 ; catalyst dosage 20 mg). Experimental and theoretical simulation results imply that the highly oxidized Mo species lead to mobile-charge imbalances in CZS and induce the directional photogenerated electrons transfer, resulting in effectively inhibited electron-hole recombination and greatly enhanced photocatalytic efficiency.
Attempts
were made to recover succinic acid from aqueous solution
by macroporous resin adsorption. The adsorption properties of succinic
acid on seven different resins (HPD-300, HPD-400, HPD-450, HPD-500,
HPD-826, AB-8, and NKA-9) were compared systematically. According
to the adsorption capacity, NKA-9 was chosen as the most suitable
resin for succinic acid purification. The influences of solution pH,
initial succinic acid concentration, and temperature were studied
by the static adsorption method. The maximum adsorption capacity for
succinic acid on NKA-9 was 155.9 mg·g–1 and
obtained at pH 2.0, initial concentration 50 mg·mL–1 and 10 °C. Langmuir and Freundlich isotherms were used to describe
the interactions between solutes and resins, and the equilibrium experimental
data were well fitted to the two isotherms. The kinetic data were
modeled using pseudo-first-order, pseudo-second-order, and intraparticle
diffusion equations. The experimental data were well described by
the pseudo-second-order kinetic model.
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