The absorption spectra of the reagent and the complex are recorded in the wavelength range 300–650 nm at pH 5.0 against CCl4. The typical superimposed UV-vis spectra of Cu(DDTC)2, Zn(DDTC)2or Hg(DDTC)2in CCl4and reagent blank are presented in Figure 2. The spectra show that Cu(DDTC...
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Although lignite can be modified to improve its adsorption performance, it is difficult to precipitate and separate lignite in wastewater treatment due to its suspension. Cheng et al.23used chitosan as bridging reagent to prepare magnetic Fe3O4particle modified sawdust, which can be quickly separated...
The anodic dissolution of reagent grade ZnS and ZnS concentrate has been studied. The majority of the research was conducted in H 2SO 4 although a limited number of tests were made in HCl and KOH. Polarization studies showed that both Zn... RA Narasagoudar,JW Johnson,T Okeefe - 《Hydrome...
Typically, hemin was dissolved in the 10 mM 50 mL NaOH solution with acid-treated commercial carbon (C-EC600) with a pH value of 10.1, and then hemin was reprecipitated and dispersed on C-EC600 by adding 3 M HCl solution. The final pH value of the solution is about 0.2, guaranteeing...
The solution pH was adjusted using NaOH (Duksan Chemicals, Korea, 93%) and HCl (Duksan Chemical, Korea, 35–37%). Reagent grade NaCl (Duksan Chemicals, Korea, 99%) was used to prepare the regeneration solution. Distilled water (EXL5 U Analysis, Vivagen, Korea) was used for the ...
Samples for grain evaluation in the as-cast condition were etched for ~1.5 min using Barker’s reagent followed by imaging with a ZEISS Axio optical light microscope (OLM) equipped with polarized light. Characterization of the grain structure and recrystallized fraction after processing up to the ...
The synthetic approach has been previously employed by us to successfully produce different ligands from the versatile di-pyridyl ketone reagent; the obtained derivatives show excellent coordination skills towards different metal ions [56,57]. The N-based polydentate ligands L1 and L2 were obtained as...
Though previously reported metal-catalyzed reactions have involved relatively strong Lewis acids with stable counter anions (e.g., TfO−), increasing the basicity of the metal catalyst should promote formation of the enolate and smooth nucleophilic reaction of the enolate to the chlorinating reagent...