The main object of this study was to compare the natural and synthetic( NaA and NaM) zeolites as absorbents in removing emulsified and dissolved traces of organic compounds, which appear in the wastewater of  power plants, refinery and petrochemical complexes.  The specific objectives of the work was: a) to select the best species that have the highest amount of absorption; b) to measure th...

A theoretical model was selected among three potentially applicable models and then used to analyze the absorption isotherms of hydrogen storage alloys LaNi5 LaNi4.75Pb0.25 at different temperatures (T = 303 K, 313 323 K). The expressions were based on statistical physics formalism simplifying hypotheses. one with highest correlation experimental data. had six adjustable parameters: number atom...

Introduction: Arsenic is known as a carcinogenic compound in drinking water. It can cause acute and chronic effects on human health. In this study, the effect of polyamidoamine dendrimer generation 3 (PAMAM G3) as adsorbents for removal of arsenic (V) from aqueous solutions was evaluated. Materials and Methods: Adsorption experiment was studied in batch system and the effect of different varia...

in the present study seven synthetic polymers were used as adsorbents for the removal of cd(ii) from aqueous solution. the equilibrium studies were systematically carried out in a batch process, covering various process parameters that include agitation time, adsorbent dosage, and ph of the aqueous solution. the analyzing system was an atomic absorption spectrometer (perkin-analyst 100). it was...

boron (b) is an important plant essential micronutrient whose availability is influenced by many soil factors. adsorption–desorption processes play a major role in governing the solubility of boron in soil solution and, consequently, its availability to growing plants. to assess the effect of sodium adsorption ratio (sar) on availability of b, adsorption of b was investigated in a sampled calca...

Due to their ability reversibly absorb/desorb hydrogen without hysteresis, Pd--Au nanoalloys have been proposed as materials for sensing. For sensing, it is important that absorption/desorption isotherms are reproducible and stable over time. A few studies pointed the influence of short long range chemical order on these isotherms, but many aspects impact remained unexplored. Here, we use alloy...

The 5 9 ~ o NMR and magnetization measurement in (Lal-,Y,) Co5Hy have been performed at 77 K. The magnetizations of these compounds decrease with increasing hydrogen content (y) and are indepedent of Y-concentration (2). This result can be interpreted by an electron transfer effect in the direction H atom -+ Co atom. The pseudobinary intermetallic compound (Lal-,Y,) C05 have CaCu5 type structur...

The aim of this paper is to find out new alternative materials that respond to sustainable development criteria. For this purpose, an original utilization of straw for the design of lightweight aggregate concretes is proposed. Four types of straw were used: three wheat straws and a barley straw. In the present study, the morphology and the porosity of the different straw aggregates was studied ...

The relaxation behavior of poly(5-acryloxymethyl-5-methyl-1,3-dioxacyclohexane), a polymer containing highly flexible side groups, is studied by broadband dielectric spectroscopy in the frequency and temperature ranges 10(-1)-10(9) Hz and 123-473 K, respectively. Above the glass transition temperature T(g) the dielectric loss in the frequency domain exhibits a prominent alpha absorption, follow...