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Adsorption and retention on soil particles are vital behaviors affecting the amount of allelochemicals in soil, which perhaps results in their accumulation. To investigate the accumulation mechanism of three phenolic acids i.e. p-hydroxybenzoic acid, benzoic acid and cinnamic acid, which existed in the soil of poplar (Populus Sect. Aigeiros Duby) plantation, we studied their sorption and retention...
Electrocatalytic oxidation of indomethacin on a modified multiplewalled carbon nanotubes (MWCNTs) cathode in aqueous solution was studied in this paper. The experiments were carried out to explore the effects of initial concentration, electrolytic voltage, pH, concentration of electrolyte and electrolysis time on removal rate of indomethacin. The results of show that the removal rate reached 78% by...
An engineered Streptomyces lydicus strain with 6-phosphofructokinase gene (pfkA1) over-expression was constructed by recombinant DNA technology. Biomass, pH value, glucose and streptolydigin concentrations were measured and the fermentation kinetics were calculated. The cell growth and glucose consumption of the engineered strain was faster in the early period, and then slow down in the later stage...
The effect factors of adsorption treatment of methylene blue (MB) solution by aged-refuse were studied with static absorption method under different conditions. In the meantime, Langmuir and Freundlich isotherm equation, pseudo-first order and pseudo-second order kinetics models were fitted. The results showed: when the initial concentration of MB solution is 10mg·L−1, the best parameters as follows:...
Based on the highly specific binding force between biotin and avidin, the bridge connection as well as the amplification, the biotin-avidin system was applied into surface plasmon resonance (SPR) biosensor. Firstly, DCC method was exploited to synthesize the BNHS, of which the melting range was 210 to 213°C. In addition, the BNHS was characterized by IR spectroscopy and NMR spectroscopy, by which...
The strong electron-accepting ability of transition metal ions enables them to catalyze the oxidation of S(IV) to S(VI) in solution. This reaction has been applied in many fields, such as flue gas desulfurization, hydrometallurgy, atmospheric chemistry, and chemical engineering. To understand the characteristics of the catalysis, this paper reviews the status of research on this reaction in the different...
A series of surface catalytic reaction equations were developed to record the relationship between degradation efficiency and cyclohexane concentration in CPCR. The half-life of photocatalytic oxidation of cyclohexane was obtained according to Langmuir-Hinshelwoods (L-H) kinetic law. The results indicated that the degradation conversion data can be fitted by three linear functions at various cyclohexane...
In this study, the electro-Fenton system had been established and graphite plates were selected as electrodes. Azo dye methyl orange was used as the model pollutant. The electrolytic bath was divided into cathode cell and anode cell two parts. The two cells were connected by salt bridge. The kinetics of methyl orange decoloration in these two cells was obtained in the optimal conditions. The results...
Degradation behavior and the effects of nitrate and sulfate of perchlorate (ClO4−) in soils and sediments of natural environments were investigated. The lag time of both ClO4− and NO3− degradation was site-specific and depended on the environmental conditions such as content of organic substrate, nitrate concentration, initial ClO4− concentration and prior ClO4− exposure. The lag time of ClO4− degradation...
Adsorption mechanism of attapulgite to TCE and its effect factors was prepared by adsorption kinetics experiments, isotherm equilibrium adsorption experiments and experiments of environmental effect factors. Its performance of adsorption showed that, compared with the original attapulgite, the removal of organattapulgites to TCE was significantly improved and grew up with the amount of organic carbon...
Nitrofuran antibiotics, such as furaltadone (FTD), are biorefractory materials in water, and the degradation of FTD by using ozonation process was studied in this paper. In all cases, the reaction of FTD degradation by ozonation follows pseudo first-order kinetics. The influences of pH value on the reaction kinetics were investigated, and the results showed that ozonation process was remarkably affected...
The purification of phosphate contained the secondary effluent of wastewater treatment plant (WWTP) by fly ash was investigated. The effect of pH, adsorbent dosage, and reaction time on purification efficiency was determined. The results showed that the phosphate the removal rate would increase to 83.3% when the adsorbent dosage was 5 g per 100 ml, the pH was neutral, and the reaction time was 4 h...
In order to study the effect of thrown condition on the rebound characteristics of elastic-plastic debris, and improved the dynamic behavior model of debris further in automobile crash. The dynamic rule of elastic-plastic's rebound parameters vary with thrown condition obtained from the kinetic simulation analysis by Ansys/Ls-Dyna. The rebound parameters indexes are vertical rebound coefficient, horizontal...
In this paper, the adsorption effect of CO2 at 5 different MDEA-TETA mix ratios, and the optimum ratio is MDEA: TETA=1∶9. More study was done on the absorption kinetics under the optimum ratio to draw the reaction order and the average activation energy. The results are as follows: the activation order n=1.22, the reaction rate constant K'=0.28.
A chlorpyrifos-degrading strain of Stenotrophomonas acidaminiphila, lux-β was chosen for research object, and the survival and chlorpyrifos-degrading activity of strain lux-β in the soil with different treatments have been investigated in this study, so as to provide technique support for monitoring the colonization and degrading activity of chlorpyrifos-degrading bacteria in natural environment....
The adsorption behavior of Cr3+ and Fe3+ on 001×7 strong-acid cation exchange resin was studied with the static method, respectively getting Adsorption Isotherms of Resin 001×7 for Cr3+ and Fe3+. The experimental results show that, in the studied concentration range, the equilibrium adsorption data of Cr3+ fit to Langmiur isotherms, while Fe3+ fitting to Frendlich isotherms. Kinetic analysis show...
Using LiOH, NiO2 and Al2O3 as raw materials, the synthesis reaction of LiNi0.95Al0.05O2 was found occurring between 410 °C to 475 °C through analyzing the synthetic process by TG-DTA technique. The kinetic parameters of reaction were calculated by Starink model and Kissinger model, they are activation energy 207.63 kJ·mol−1, reaction order 1.61, reaction rate constant 0.74, and then the rate equation...
Fly ash was modified with activated sludge, then the adsorption property on Methylene blue was studied. And the results indicated that fly ash modified with activated sludge showed very effective adsorption on Methylene blue compared with fly ash, and the adsorption capacity increased with the adding amount of activated sludge, achieving 9.08 mg/g when wt% of sludge was 50%, higher than the single...
Arsenic is a toxic heavy metal. It has caused serious pollution of groundwater recent years, the treatment of arsenic contamination drinking water becomes a hot research topic. In this paper, the granitization red soil, which is widely distributed in South China, cheap easy to get is used as the adsorption material, studied by adsorption of arsenic removal performance. The results show that after...
This paper introduced mass transfer theory and correlation analysis of the NOx liquid absorption. Experiments using urea as the absorbent and triethanolamine as additive were performed in the bubbling absorption reactor. The influencing factors of the NOx removal such as the oxygen existence, sulfur dioxide existence, triethanolamine existence, absorbent concentration and ammonium sulfite were studied,...
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