This paper focuses on the finding best operational conditions using response surface methodology (RSM) for Rhodamine123 (R123) and Disulfine blue (DSB) dyes removal by ultrasound assisted adsorption onto Au-FeO nanoparticles loaded on activated carbon (Au-FeO NPs-AC). The influences of variables such as initial R123 (X) and DSB concentration (X), pH (X), adsorbent mass (X) and sonication time (X) on their removal were investigated by small central composite design (CCD) under response surface methodology. The significant variables and the possible interactions among variables were investigated and estimated accordingly. The best conditions were set as: 4min, 4.0, 0.025g, 13.5 and 26.5mgL for sonication time, pH, adsorbent weight, initial R123 and DSB concentration, respectively. At above conditions, the adsorption equilibrium and kinetic follow the Langmuir isotherm and pseudo-second-order kinetic model, respectively. The maximum monolayer capacity (Q) of 71.46 and 76.38mgg for R123 and DSB show sufficiency of model for well presentation of experimental data.

In this project, in the first step, the graphene oxide‐metformin‐nickel catalyst has been prepared and then the Ni(II) was reduced to Ni(0) by hydrazine hydrate and Ni(0) nanoparticle coordinated to metformin‐GO was achieved. After full characterization of catalyst structure by different analyses like fourier‐transform infrared spectroscopy (FT‐IR), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X‐Ray analysis (EDX), X‐Ray diffraction analysis (XRD), thermal gravimetric analysis (TGA), and coupled plasma/atomic emission spectroscopy (ICP), as well as confirm the successful synthesis of catalyst, the activity of catalyst has been examined in the Suzuki–Miyaura cross‐coupling reaction.

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The polarizable continuum model (PCM) is employed to describe the system in the condensed phase. The performance of DFT and PCM in describing high order nonlinear mixed electric and magnetic effects in condensed phase are described. In this paper we consider the effect of 10 solvents with a wide range of dielectric constants on 4 amino acids. NMR shielding values (ppm), isotropic and anisotropic effects, energy interaction between solute and solvent, and the effect of hydrogen bond on shielding are described. Direct and indirect solvent effects on shielding are also calculated. The observed solvent-induced shielding variation is more strongly related to the intensity of the solvent reaction field rather than on the change of molecular geometry induced by the solvent.