Precipitation method was applied to synthesize pure and PbS (1−x) Mn (x = 0%, 5%, 10% and 15%) nanoparticles. There have been reports on the usefulness of Mn-doped PbS (PbS:Mn) nanoparticles in removal Benzyl Paraben (BP) dye from aqueous solutions. The distinctive features of this novel material were identified using different techniques like BET, XRD, SEM and FT-IR. The optimal conditions for the (BP) dye removal were found to be 2, 15 min, 100 mg/L, and 0.1 g for pH, contact time and adsorbent dosage, respectively. Regarding the Kinetic models both pseudo-first-order and pseudo-second-order diffusion models of (BP) dye revealed that the kinetic of adsorption process followed second-order equation model. After using various Isotherm models to fit the experimental equilibrium data with, the adequacy and applicability of Langmuir model has been proven. Adsorption mechanism for these adsorbents was considered to be physical which was confirmed by the E (kJ mol-1) obtained from DubininRadushkevich isotherm for pure PbS, PbS/Mn-5%, PbS/Mn-10% and PbS/Mn-15% were roughly -710.0, -780.0, -830.0 and -920.0 (kJmol-1) respectively. The thermodynamic parameters including enthalpy, entropy and Gibbs energy were calculated for the adsorption of these (BP) dye using Mn-doped PbS nanoparticles suitable, spontaneous and exothermic. The maximum adsorption capacity of the (BP) dye for pure PbS, PbS/Mn-5%, PbS/Mn-10% and PbS/Mn-15% were roughly 80.0, 105.0, 131.0 and 145.0 mg/g, respectively. The findings revealed the appropriateness of Mn-doped PbS (PbS:Mn) nanoparticles as an adsorbent for (BP) dye deletion from aqueous solutions. پرونده مقاله

The applicability of N-(3-nitro-benzylidene)-N-trimethoxysilylpropyl-ethane-1,2-diamine onto multi walled carbon nanotubes(NBATSPED-MWCNTs) for removing Bismarck Brown and Disulfine Blue from aqueous solutions has been reported. This novel material was characterized by different techniques such as XRD, SEM and FT-IR. The influence of nanoparticle dosage, pH of the sample solution, individual dyes concentration, contact time between the sample and the adsorbent, temperature, and ionic strength of the sample solution were studied by performing a batch adsorption technique. The maximum removal of 15 mg L-1 of individual dyes from an aqueous sample solution at pH 8.0 for Bismarck Brown (BB) and at pH 6.0 for Disulfine Blue (DSB) was achieved within 65 min when an adsorbent amount of 50 mg was used. It was shown that adsorption of the Bismarck Brown (BB) and Disulfine Blue (DSB) follows the pseudo-second-order rate equation, while the Langmuir model explains equilibrium data. Isotherms had also been used to obtain the thermodynamic parameters such as free energy (ΔG0), enthalpy (ΔH0) and entropy (ΔS0) of adsorption. The negative value of (ΔGo, ΔHo and ΔSo) confirmed the sorption process was endothermic reflects the affinity of multi walled carbon nanotubes functionalized towards Bismarck Brown (BB) and Disulfine Blue (DSB). A maximum adsorption capacity in binary-component system (6.67 mg/g for Bismarck Brown (BB), and 9.36 mg/g for Disulfine Blue (DSB)). پرونده مقاله

In this paper, a highly selective sample cleanup procedure combining molecular imprinting andsolid phase extraction (MI-SPE) was developed for the isolation of toxic bentazon in surface water.The molecularly imprinted polymer (MIP) was prepared using bentazon as the template molecule,methacrylic acid as the functional monomer, and ethylene glycol dimethacrylate as the cross-linkingmonomer. The bentazon imprinted polymer was used as a selective sorbent for the solid-phaseextraction of bentazon from surface water. An offline MI-SPE method followed by highperformance liquid chromatography was also established. To evaluate the applicability of the MIPfor separation and determination of bentazon by HPLC, general parameters for SPE including thenumber of loading solvents, washing solution and eluent, and pH of the sample were optimizedfollowing a step-by-step approach. The calibration curve was linear in the range of (0.05 to 0.6 µg L−1). The standard deviation of (2.2 %) and detection limit of the method (0.05 µg L−1) wereobtained for sensor level response. It was shown that recoveries up to approximately 97.0 % fromspiked surface water samples could be obtained. It was demonstrated that the proposed MI-SPEHPLC method could be applied to the direct determination of bentazon in surface water. پرونده مقاله

Tartrazine is a synthetic organic food dye that can be found in common food products such as bakery products, dairy products, candies, and beverage. The presence and content of tartrazine color must be controlled in food products due to their potential harmfulness to human beings.To determine the tartrazine color in solution, we used a prepared from Starch-capped ZnSNPs sensor and kinetic spectrophotometric method. The calibration curve was linear in the range of 0.01 to 10.0 mg L-1. The standard deviation of 1.0 %, and detection limit of the method (0.01 mg L-1 in time 25 min, 399 nm) were obtained for sensor level response Starch-capped ZnSNPs with (95%) confidence evaluated. The chemical Starch-capped ZnSNPs sensor made it possible as an excellent sensor with reproducibility. پرونده مقاله