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Abstract
The uranium(VI) accumulation was studied in detail by using the biomass of mangrove endophytic fungus Fusarium sp.#ZZF51 from the South China Sea. The uranium(VI) biosorption process onto the tested fungus powders was optimized at pH 4.0, adsorption time 60 min, and uranium(VI) initial concentration 50 mg L−1 with 61.89% of removal efficiency. According to Fourier transform infrared spectra for the tested fungus before and after loaded with uranium(VI), the results showed that both of hydroxyl and carboxyl groups acted as the important roles in the adsorption process. In addition, the experimental data were analyzed by using parameter and kinetic models, and it was obtained that the Langmuir isotherm model and the pseudo-second-order kinetic model provided better correlation with the experimental data for adsorption of uranium(VI).
The specific aim of this investigation was to study the kinetics of the degradation of cefazolin, cefaclor, cefuroxime axetil, and cefepime in aqueous solution, in the presence (or absence) of various redox agents (iodine solution, potassium permanganate, hydrogen peroxide, sodium thiosulfate, and ascorbic acid) as a function of temperature. Various factors, such as concentration of the analyzed compounds and redox agents, storage time, and temperature, were analyzed. The degradation process of chosen antibiotics was observed chromatographically and fitted to the kinetic models, obtaining model parameters (k, t 0.1, t 0.5). Principal component analysis (PCA), parallel factor analysis (PARAFAC), and hierarchical cluster analysis (HCA) methods were carried out to interpret the dependencies between these factors on the drug stability.
Abstract
The radiolytic degradation of widely used fungicide, carbendazim, in synthetic aqueous solutions and industrial wastewater was investigated employing γ-irradiation. The effect of the absorbed dose, initial concentration and pH of irradiated solution on the effectiveness of carbendazim decomposition were investigated. Decomposition of carbendazim in 100 μM concentration in synthetic aqueous solutions required irradiation with 600 Gy dose. The aqueous solutions of carbendazim have been irradiated in different conditions, where particular active radical species from water radiolysis predominate. The obtained data have been compared with the kinetic modeling. The reversed-phase high-performance liquid chromatography was used for the determination of carbendazim and its radiolytic decomposition products in irradiated solutions. The changes of toxicity of irradiated solutions were examined with different test organisms and human leukemia cells.
insecticides (Pyriproxyfen and Fenpropathrin) was assessed by fitting data of residual concentration versus time since treatment (in days) to several kinetic models (zero order, first order, and second order equations) listed in Table 1 , and then selecting
analysis was limited to batch configuration ( Kashyap et al., 2015 ). The purpose of this communication is to provide a mathematical description of the biocatalytic behavior of Pectinex Ultra SP-L. We formulate kinetic models that describe FOS production in
mechanism of RW biomass' components The integral master-plots have been used to reveal and to estimate the kinetic models f(x) for hemicellulose, cellulose and lignin's RW biomass components. Figures 10–12 show the plot of experimental and theoretical
kinetic modeling purposes, a realistically possible 10% saline + 90% freshwater mixture has been selected. Different amounts of CO 2 inflow change the reactions in three major steps characterized by the full dissolution of albite and calcite
the surface of the adsorbent ( Foo and Hameed, 2010 ). In contrast, adsorption kinetics is described as diffusion behavior and the adsorption rate of solute ( Das, 2020 ). The linear forms of adsorption isotherm and kinetic models are shown in Table 2
kinetic models, as discussed above, can be also applied for the whole range of concentration of gaseous reagent. Figure 5 shows the application of the kinetic models discussed earlier to experimental results obtained during gasification of sewage sludge
the reaction process without the assumption of a kinetic model for the process. Usually the knowledge of the reaction type is also not necessary to find the activation energy by model-free methods. The first assumption for model
