A comparative study on the batch performance of fluoride adsorption by activated silica gel and activated rice husk ash

ABSTRACT A comparative study was done for removal of fluoride by activated silica gel (ASiG) and activated rice husk ash (ARHA) through batch techniques. The fluoride removal performance of both adsorbents such as ASiG and ARHA was evaluated as a function of the initial concentration, adsorbent dose, contact time and pH. The adsorbent dose characterized as having high selectivity for fluoride and larger adsorption capacity. Characterization of ASiG and ARHA before and after fluoride adsorption was studied by SEM and FTIR study was done to get a better insight into the mechanism of adsorption. The rate of adsorption was rapid and followed pseudo-second-order kinetics for both adsorbents. The system followed the Langmuir isotherm model for both ASiG and ARHA with adsorption capacity 0.244 mg g -1 and 0.402 mg g -1 respectively

Measurement of the lepton charge asymmetry in inclusive WW production in pp collisions at s=7\sqrt{s} = 7 TeV

A measurement of the lepton charge asymmetry in inclusive pp to WX production at sqrt(s)= 7 TeV is presented based on data recorded by the CMS detector at the LHC and corresponding to an integrated luminosity of 36 inverse picobarns. This high precision measurement of the lepton charge asymmetry, performed in both the W to e nu and W to mu nu channels, provides new insights into parton distribution functions.A measurement of the lepton charge asymmetry in inclusive pp to WX production at sqrt(s)= 7 TeV is presented based on data recorded by the CMS detector at the LHC and corresponding to an integrated luminosity of 36 inverse picobarns. This high precision measurement of the lepton charge asymmetry, performed in both the W to e nu and W to mu nu channels, provides new insights into parton distribution functions.A measurement of the lepton charge asymmetry in inclusive pp to WX production at sqrt(s)= 7 TeV is presented based on data recorded by the CMS detector at the LHC and corresponding to an integrated luminosity of 36 inverse picobarns. This high precision measurement of the lepton charge asymmetry, performed in both the W to e nu and W to mu nu channels, provides new insights into parton distribution functions