background nowadays, removal of heavy metals from the environment is an important problem due to their toxicity. objectives in this study, a modified method was used to synthesize chitosan-coated magnetite nanoparticles (ccmn) to be used as a low cost and nontoxic adsorbent. ccmn was then employed to remove hg2+ from water solutions. materials and methods to remove the highest percentage of mer...

Box-Behnken designs (Box and Behnken, 1958, 1960) form a very popular class of 3-level second-order designs when the number of factors is small, typically, seven or less. For larger number of factors these designs are not so popular because then, these designs require a large number of runs. This paper provides a catalog of 3-level second-order designs for 5-11 factors with run sizes ≤ 100. All...

Sulfur is one of the most significant impurities in coal, which reduces the quality of coal and also results in environmental pollution. This work was aimed to investigate the removal of sulfur from coal by the leaching method employing parameters expected to affect the removal rate such as acid concentration (10-30%), temperature (40-80 °C), and reaction time (40-100 min). A response surface m...

The interaction between the ions and the charge of membranes can affect the efficiency of pollutant removal. The present study investigated the removal efficiency of hexavalent chromium and nitrate ions from both actual and synthetic contaminated water via two different commercial spiral wound polyamide nanofilters. In addition, the interaction of ions under different experimental conditions wa...

Selenium (Se) as a vital trace element has many biological activities such as anti-inflammation and anti-oxidation. Selenomethionine as an organic selenium plays a vital role in the response to oxidative stress. At present, Saccharomyces cerevisiae is one of the best microorganisms that has the ability to accumulate selenium. Production of Seleno-yeast was done by growing Saccharomyces cerevisi...

Selenium (Se) as a vital trace element has many biological activities such as anti-inflammation and anti-oxidation. Selenomethionine as an organic selenium plays a vital role in the response to oxidative stress. At present, Saccharomyces cerevisiae is one of the best microorganisms that has the ability to accumulate selenium. Production of Seleno-yeast was done by growing Saccharomyces cerevisi...