Adsorption of aromatic compound by multi-walled carbon nanotube from sea water

It is global concern that soil and water were contaminated with organic substances such as BTEX (benzene) (B), toluene (T) and xylene (x) .The presence of excessive amounts of BTEX in aqueous surroundings may have a greatly adverse impact on water quality and thus endanger public health and welfare. Carbon nanotubes (CNT) have aroused widespread attention as a new type of adsorptions due to their outstanding ability for the removal of various inorganic and organic pollutants from large volume of wastewater. Due to variety of adsorbent and their ability to adsorb pollutant, it is possible to reduce expenses and completely omit pollutant. In this CNT is used as a new adsorbent for removal pollutant such as benzene, toluene, and xylene. The result in the area of adsorbing benzene, toluene, and xylene is as follows: the changes of pH don’t affect the capacity of adsorption and the greatest amount of adsorption occurs in pH. The greatest amount of adsorption occurs when using 0.01gr CNT oxidized. Comparing CNT with CNT oxidized in term of adsorption capacity, it is proved that the adsorption capacity of CNT oxidized is much more than CNT. The result of comparing the percentage of adsorption of mentioned elements (B, X, T) is as follows; the amount of adsorption of xylene is more than toluene and toluene is more than benzene. It should be mentioned that in this research the percentage of adsorption to measure is between to 70-80.

Evaluation and measurement of chromium in sea water in order to remove it with mineral absorbent kaolin for desalination

Today, the use of heavy metals and chemical products industry expanded. The presence of significant amounts of, pollutants in industrial waste water can lead to serious risks to the environment and human health have heavy metals like chromium is one example of the future of salmon knock pond environment. Chromium is an essential element in the diet, but high doses of this element is very dangerous. Hence the use of chemical methods as a tool for the removal of metals from waste water pond be used. The aim of this study was to investigate the mineral kaolin adsorbents for the removal of chromium is water. Thus, the effect of different concentrations of absorbent micro amounts of chromium absorption and variable temperature, pH and electrolytes were studied. During the investigation of spectroscopic instrument (Varian) UV-VIS are used. Comparison of the absorption mechanism of chromium adsorption by the adsorbent with nano-absorbent kaolin kaolin was investigated. According to the studies done in the same conditions of temperature, pH and shaking rate of chromium absorption by nano kaolin kaolin is much more attractive. Therefore, its use as an adsorbent abundant, cheap, accessible, efficient and effective is proposed.

Studying and measuring the amount of detergents in sea-water samples in order to eliminate with adsorbents and inorganic nano-adsorbents for the sake of securing the water for marine nourishment pools

Increasing the amount of detergent industries in world in spite of having abundant benefits; entering a new kind of contamination into environment and attract the attention of environment liable of different countries to itself. Entering detergents into an aqueous solution cause pollution of water sources and environment in respect of appearing e problem and charges like: nutritive phenomenon, decomposition of hard group of detergent and producing foam. After using Detergents, they were poured into rivers, seas and lakes and have destructive effect on environment. A lot of hygiene problems were attributed to the water having detergents more than allowed value. So, it is specified the importance of eliminating detergents from contaminated water and it is application for secondary use. In order to attain to this aim, we can use inorganic nano and micro-caolin. In this study the adsorptive properties of detergent on the micro and nano caolin adsorbents were studied and the effect of various parameters like the amount of adsorptive materials, initial concentration of detergent, speed of stirring, electrolyte, temperature, time and pH were determined. The surface area of micro- and nano-caoline was reported 11.867 and 49.1438 m2 g-1, respectively. That increasing in nano-caoline surface area confirms increasing in capacity and more rate of adsorption. The results gained by this research recommend using micro- and nano-caolin as a plentiful, available and effective adsorbents. Also in comparison, using nano-caoline was recommended in order to have more effectiveness.