There are enormous economic benefits to conveniently increasing the selective recovery capacity of gold. Fe/Co-MOF@PDA/NdFeB double-network organogel (Fe/Co-MOF@PDA NH) is synthesized by aggregation assembly strategy. The package of PDA provides a large number of nitrogen-containing functional groups that can serve as adsorption sites for gold ions, resulting in a 21.8% increase in the ability of the material to recover gold. Fe/Co-MOF@PDA NH possesses high gold recovery capacity (1478.87 mg g
In this work, we synthesized self-regenerative chitosan (SRCS) by combining the photo-catalyst TiO2 and cross-linking chitosan (CS). The novel SRCS hybrids were then used as adsorbents to remove methyl orange (MO) and they demonstrated excellent adsorption capacity (∼799.2 mg g−1) and significant photocatalytic self-regenerative properties. The pseudo-first-order (PFO), pseudo-second-order (PSO) and Weber–Morris kinetics models were applied to fit the experimental data obtained from batch experiments. The PSO kinetic model was more appropriate for describing the adsorption of MO onto the SRCS. Interestingly, the SRCS adsorbent was successfully regenerated by UV photocatalysis after adsorption. More importantly, the adsorption effectiveness of the SRCS remained constant through eight regeneration cycles. This study provides a green method of removing organic pollutants that combines adsorption enrichment with photocatalytic degradation.
Molecular dynamics simulations of the melting curves of six metals including Ag, Cu, Al, Mg, Ta, and Mo for the pressure range (0 to 15) GPa are reported. The melting curves of Ag, Cu, Al, and Mg fully confirm measurements and previous calculations. Meanwhile, the melting curves of Ta and Mo are consistent with previous calculations but diverge from laser-heated diamond-anvil cells values at high pressure. Our results suggest that the melting slope at 100 kPa is related to the electronic configuration of the element. In addition, the pressure dependence of fusion entropy and fusion volume are calculated up to 15 GPa. The overall fusion entropy is separated into topological entropy of fusion (ΔSD) due to the configuration change in melting and the volume entropy of fusion (ΔSV) due to the latent volume change in melting. Furthermore, we checked the R ln 2 rule under high pressure, according to which the value of ΔSD is a constant at ambient pressure. Result shows that the value of ΔSD is close to R ln 2 at ambient pressure and reflects a slow decrease when pressure increases.
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