Adsorption Behavior and Mechanism of Palladium on Diethylaminoethyl-Modified Polyglycidyl Methacrylate Macroporous Spheres

The recovery of precious metals, such as palladium (Pd), from wastewater, is an economically important field. The present study reports the application of polyglycidyl methacrylate (PGMA) macroporous spheres with diethylaminoethyl (DEAE) functional groups (PGMA–DEAE) for the adsorption of palladium ions [Pd(II)] from simulated wastewater solutions. The effects of pH, adsorption duration, and initial concentration of Pd(II) on the adsorption amount were evaluated systematically. The results revealed that within the experimental pH range, the adsorption efficiency of Pd(II) increased with increasing pH. In particular, between pH 4 and 6, the Pd(II) adsorption efficiencies were approximately 100%. At 298 K and pH ∼ 4, the adsorption capacity of PGMA–DEAE for Pd(II) was 1.22 mmol/g. The adsorption rates of PGMA–DEAE for Pd(II) were high, and the adsorption equilibrium was reached within 10 min. Ca(II), Mg(II), Co(II), Cu(II), Ni(II), and Fe(II) were selected as representative competitive adsorption metal ions. PGMA–DEAE had good separation selectivity for Pd(II) at pH 1–6 (all RPd/Me > 30), especially at pH ∼ 4 (all RPd/Me > 100). The SEM, TEM, EDS, TG, XRD, and XPS results indicated that in a high-acidity environment (CHCl ≥ 1 mol/L), Pd(II) was adsorbed on PGMA–DEAE through electrostatic attraction, while in a low-acidity environment (pH 1–6), Pd(II) was adsorbed on PGMA–DEAE through coordinated bonding between the Pd(II) ions and the N. PGMA–DEAE exhibited excellent stability and regeneration performance for five regeneration cycles

Atom- and Step-Efficient Construction of Five-Membered Carbocycles with Alkenes and Alkynes Catalyzed by AgSbF₆

We report a cationic intermolecular cyclization between simple alkenes and alkynes catalyzed by AgSbF₆ with great selectivity, involving alkyl C–H bond cleavage. This methodology could supply important multisubstituted cyclopentene scaffolds. The remarkable tolerance of functional groups in the reaction allows great possibility for further transformations

Atom- and Step-Efficient Construction of Five-Membered Carbocycles with Alkenes and Alkynes Catalyzed by AgSbF₆

We report a cationic intermolecular cyclization between simple alkenes and alkynes catalyzed by AgSbF₆ with great selectivity, involving alkyl C–H bond cleavage. This methodology could supply important multisubstituted cyclopentene scaffolds. The remarkable tolerance of functional groups in the reaction allows great possibility for further transformations

Diverse Tandem Cyclization Reactions of <i>o</i>‑Cyanoanilines and Diaryliodonium Salts with Copper Catalyst for the Construction of Quinazolinimine and Acridine Scaffolds

Two cyclization modes are realized to produce different nitrogen-containing heterocycles, i.e., quinazolin-4­(3<i>H</i>)-imines and acridines by assembling <i>o</i>-cyanoanilines and diaryliodonium salts via tandem reaction pathways

Cu-Catalyzed Arylcarbocyclization of Alkynes with Diaryliodonium Salts through C–C Bond Formation on Inert C_(sp3)–H Bond

Copper-catalyzed arylcarbocyclization reaction of alkynes was realized with diaryliodonium salts through C–C bond formation on an inert C_(sp3)–H bond. This method provides an efficient cyclization of alkyl alkynes to generate carbocycles with good step-economy. Theoretical study revealed an interesting Cu-catalyzed concerted pathway of the C–C bond formation

Cu-Catalyzed Arylcarbocyclization of Alkynes with Diaryliodonium Salts through C–C Bond Formation on Inert C_(sp3)–H Bond

Copper-catalyzed arylcarbocyclization reaction of alkynes was realized with diaryliodonium salts through C–C bond formation on an inert C_(sp3)–H bond. This method provides an efficient cyclization of alkyl alkynes to generate carbocycles with good step-economy. Theoretical study revealed an interesting Cu-catalyzed concerted pathway of the C–C bond formation

A Concise Construction of Polycyclic Quinolines via Annulation of ω‑Cyano-1-alkynes with Diaryliodonium Salts

A concise construction of polycyclic quinolines via intramolecular [2 + 2 + 2] annulation of ω-cyano-1-alkynes with diaryliodonium salts was realized. The process produced polycyclic quinolines in high yields with readily available staring materials and was tolerated with halogen substituents

Positive selection sites analysis using SLAC, FEL, IFEL and REL methods.

<p>Positive selection sites analysis using SLAC, FEL, IFEL and REL methods.</p

Phylogenetic analysis of the whole segment sequences of L, M, and S segments of 122 SFTSV strains.

<p>The maximum likelihood trees were constructed by using MEGA 5.02 software (<a href="http://www.megasoftware.net/" target="_blank">http://www.megasoftware.net/</a>). SFTSV was classified into 5 lineages labeled as A, B, C, D, and E by each genome segment. GenBank accession number and strain name were labeled on each branch. Bootstrap values ≧70 were labeled at nodes. Scale bar represented nucleotide substitutions per site.</p

Time-scaled Bayesian MCC phylogenetic tree based on concatenated SFTSV complete genome sequences.

<p>Tree nodes were annotated with posterior probability values (right), estimated median dates of time to most recent common ancestor (TMRCA) and 95% confidence interval of TMRCA (above). Lineages (A, B, C, D and E) were marked with different colors. SFTSV strain names were labeled on each branch. Horizontal axis indicated time in years.</p