in this study adsorption of 1-chloro-4-nitrobenzene on single walled carbon nanotubes has been investigated.  the effect of contact time, ph, initial concentration of 1-chloro-4-nitrobenzene, adsorbent dosage and temperature on its adsorption has been carried out in order to find optimum adsorption conditions. adsorption isotherms and related constants were also determined. results showed that ...

anionic dbs surfactant can be photodegraded in a tio2 dispersion and h2o2 solution under an hg-lamp (15 w) uv illumination or solar exposure. degradation process has been monitored through cleavage of aromatic moiety. degradation of the detergent was small when the photolysis was carried out in the absence of tio2 and h2o2 and it was negligible in the absence of light. most of the curves repres...

The main objective of this work was to assess the optimization of Fe and Cu bioleaching from converter slag using Acidithiobacillus ferrooxidans. Important parameters that contribute to the bioleaching process include initial pH, initial Fe2+ concentration and pulp density. In order to optimize these parameters, the response surface methodology (RSM) was applied. The maximum...

where e = the total enzyme concentration, s = the substrate concentration, t = the time, and K’ = the proteolytic coefficient (3) of the system. Reinvestigation of the above reaction over a greater range of initial substrate concentrations has now shown that the initial reaction velocity at 25’ is essentially independent of the initial substrate concentration for concentrations varying from 0.0...

background and objectives: application of garlic oil in food industry can be improved by encapsulation. there is no study about the formation of inclusion complex of garlic oil by beta-cyclodextrin. the aim of the present study is comparison of the antioxidant and antibacterial activities of free and encapsulated garlic oil with beta-cyclodextrin. materials and methods: antioxidant activity was...

Biodegradation kinetics of 4-nitrophenol (PNP) in aqueous solution by a gram negative soil bacterium, Ralstoniaeutropha was firstly studied in a small scale batch reactor. The degradation of PNP was evaluated at initial PNP concentrations ranging from 3 mg/L to 14 mg/L. The rate of PNP consumption by the bacterium culture was modeled using Monod and Contois kinetics in batch condition. PNP degr...

background: the presence of heavy metals in the environment especially in water supplies have caused many concerns because of their toxicity and non-degradability. hexavalent chromium (cr) is one of the most toxic metals which is used in many industries, so it is essential to remove it from industrial wastewater. in this study, we made a comparison between different adsorption isotherms in the ...