Ain Shams University

About: Ain Shams University is a education organization based out in Cairo, Egypt. It is known for research contribution in the topics: Population & Medicine. The organization has 23886 authors who have published 34493 publications receiving 444594 citations. The organization is also known as: ASU.

Removal of toxic metal ions from wastewater using ZnO@Chitosan core-shell nanocomposite

Abstract: Presently, there is increased attention and focus on heavy metals due to their adverse health effects. The purpose of this work was to fabricate ZnO@Chitosan core/organically shell nanocomposite (ZOCS) to remove Pb(II), Cd(II) and Cu(II) ions from polluted water. The results of adsorbent characterization by TEM, FE-SEM, EDX and FTIR revealed the formation of round shape particles with average size 58 nm. The optimum removal efficacy for Cu(II), Pb(II) and Cd(II) was recorded at pH 4, 6 and 6.5, respectively. According to Langmuir isotherm model, the metal ions adsorption capacity were 476.1, 135.1 and 117.6 mg/g, for Pb(II),Cd(II) and Cu(II) respectively. Continuous adsorption-desorption cyclic results demonstrated that ZOCS NC can be reused after recovery of ions by disodium salt of EDTA solution, and the renovated ZOCS can be used many times without significant efficiency loss satisfied the increasing need for the purification of water resources.

Search for heavy bottom-like quarks in 4.9 fb-1 of pp collisions at √s = 7 TeV

Abstract: Results are presented from a search for heavy bottom-like quarks, pair-produced in pp collisions at sqrt(s) = 7 TeV, undertaken with the CMS experiment at the LHC. The b' quarks are assumed to decay exclusively to tW. The b' anti-b' to t W(+) anti-t W(-) process can be identified by its distinctive signatures of three leptons or two leptons of same charge, and at least one b-quark jet. Using a data sample corresponding to an integrated luminosity of 4.9 inverse femtobarns, observed events are compared to the standard model background predictions, and the existence of b' quarks having masses below 611 GeV is excluded at 95% confidence level.