The separations of alcohols with hydrophilic and hydrophobic parts, and the separation of aromatic mixtures, are extremely important processes in gas and petroleum industries. Choosing an adsorbent for performing this separation is the most important part of the process. Silica gel is used as an adsorbent is various techniques such as pressure swing adsorption (PSA) and gas and liquid chromatog...

Tree bark is among the widely available and low-cost sorbents for metal adsorption in aqueous environments. A state-of-the-art review is compiled carrying out a comprehensive literature search on the biosorption of heavy metals in solution onto different bark species, including a characterization of bark structure and chemistry. The results indicate that biosorption has been gaining importance ...

a sensitive and simple method for simultaneous preconcentration of trace heavy metal ions in some cerealand vegetable samples has been reported. the method is based on the adsorption of cu2+, fe3+, zn2+ and pb2+on 2-(2-nitro-phenylazo)-naphthalen-1-ol (npn) loaded on activated carbon (ac). the adsorbed metals onactivated carbon were eluted using 3 ml 4 mol l−1 nitric acid. the influences of the...

Buildings consume too much energy. For example, 16.6% of all the energy used in the United States goes towards just the heating and cooling of buildings. Many governments, organizations, and companies are setting very ambitious goals to reduce their energy use over the next few years. Because the time periods for these goals are much less than the average lifetime of a building, existing buildi...

Activated carbon is an amorphous carbon chain which has extremely extended surface area. High surface area of activated carbon is due to the porous structure. Activated carbon, using a variety of materials such as coal and cellulosic materials; can be obtained by both physical and chemical methods. The prepared activated carbon can be used for decolorize, deodorize and also can be used for remo...

We investigated a new kind of activated carbon named gaiasafe-Formstoff as an agent for powerful heavy metal reduction. This activated carbon contains highly dispersed sulfide compounds. Our investigations with lead containing wastewaters showed an outstanding metal sulfide precipitation power of the new agent. The lead reduction rates are independent of wastewater parameters like lead concentr...

A sensitive and simple method for simultaneous preconcentration of trace heavy metal ions in some cerealand vegetable samples has been reported. The method is based on the adsorption of Cu2+, Fe3+, Zn2+ and Pb2+on 2-(2-nitro-phenylazo)-naphthalen-1-ol (NPN) loaded on activated carbon (AC). The adsorbed metals onactivated carbon were eluted using 3 ml 4 mol L−1 nitric acid. The influences of the...

Mesoporous silica-carbon composites functionalized with acidic oxygen groups were prepared by oxidation of a layer of carbon deposited inside the silica pores. The synthesis procedure involved the following steps: a) removal of the silica surfactant, b) impregnation of the silica pores with a carbon precursor, c) carbonization and d) oxidation with ammonium persulfate. The resulting silica-carb...

We have examined the superfluidity of 3He in 98.2% porous silica aerogel with up to 34% 4He at 21.6 bars. The mixture is phase separated for 4He fractions between ,11% and 34%, and the 4Herich phase preferentially occupies the regions of highest silica density in the aerogel, thus modifying the distribution of the correlated disorder seen by superfluid 3He. The 3He Tc increases slightly with 4H...