An-Najah Staff

Phenolic organic compounds are extremely highly generated from many resources which disposed to sewerage system without treatments that increase the risk of contaminating water resources. This study is focused on preparing and studying the properties of activated carbon produced from cypress fruit by chemically activation using phosphoric acid (H 3 PO 4) as an activating agent. The activated carbon used to adsorb p-nitrophenol (PNP) from the aqueous solution. Result show that the activated carbon produces from cypress fruit gives good percentage yields which reach up to 51.8%. Surface area determined by iodine number showed 524.1m 2 /g. The adsorptive properties of CFAC were investigated in terms of adsorbent dose, PNP concentration, pH, and temperature and contact time in a batch system. Results indicate that the optimum percent of PNP removal 90.9 % when adsorbent dosage 0.3g and PNP concentration 80mg/L and percentage removal of PNP increase when the concentration of PNP decrease which maximum percentage removal reach 93.2% when PNP concentration 20mg/L and 0.1g CFAC. The effect of temperature on adsorption by CFAC has also been investigated in the range of 15-45 °C. The results indicate that the temperature slightly affected effectiveness of CFAC adsorption. The results showed that equilibrium time for PNP adsorption is 150min, but most the adsorption attained within the first ten minute. Results investigate that the produced cypress fruit activated carbon (CFAC) adsorption equilibrium is represented by both Frenundlich and Langmuir equilibrium model, but Langmuir model describe very well the adsorption. The main properties of Langmuir equation can be expressed in term of separation factor, R L . The R L equal 0.053 that indicate the adsorption favorable.

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Phenolic organic compounds are extremely highly generated from many resources which disposed to sewerage system without treatments that increase the risk of contaminating water resources. This study is focused on preparing and studying the properties of activated carbon produced from cypress fruit by chemically activation using phosphoric acid (H 3 PO 4) as an activating agent. The activated carbon used to adsorb p-nitrophenol (PNP) from the aqueous solution. Result show that the activated carbon produces from cypress fruit gives good percentage yields which reach up to 51.8%. Surface area determined by iodine number showed 524.1m 2 /g. The adsorptive properties of CFAC were investigated in terms of adsorbent dose, PNP concentration, pH, and temperature and contact time in a batch system. Results indicate that the optimum percent of PNP removal 90.9 % when adsorbent dosage 0.3g and PNP concentration 80mg/L and percentage removal of PNP increase when the concentration of PNP decrease which maximum percentage removal reach 93.2% when PNP concentration 20mg/L and 0.1g CFAC. The effect of temperature on adsorption by CFAC has also been investigated in the range of 15-45 °C. The results indicate that the temperature slightly affected effectiveness of CFAC adsorption. The results showed that equilibrium time for PNP adsorption is 150min, but most the adsorption attained within the first ten minute. Results investigate that the produced cypress fruit activated carbon (CFAC) adsorption equilibrium is represented by both Frenundlich and Langmuir equilibrium model, but Langmuir model describe very well the adsorption. The main properties of Langmuir equation can be expressed in term of separation factor, R L . The R L equal 0.053 that indicate the adsorption favorable.

The detailed study of corrosion behaviour of copper in 2M nitric acid solution in the presence and absence of 2-(4-(2-ethoxy-2-oxoethyl)-2-p-tolylquinoxalin-1(4H)-yl)acetate (Q1) was investigated using weight loss method at various temperatures from 303 to 343 K. The inhibitor showed 97% inhibition efficiency at its optimum concentration 10-3M at 303K and decreased at higher temperatures. The thermodynamic parameters such as, equilibrium constant, adsorption heat and adsorption entropy were obtained. The various parameters of activation determining the kinetic data such as energy, enthalpy and entropy at different concentrations of the inhibitor were evaluated and discussed. The adsorptive behaviour of Q1 followed Langmuir-type isotherm. The standard free energies of adsorption were negative at different temperatures tested, reûecting better inhibition performance.

The effect of temperature on the corrosion behavior of copper in 2M nitric acid solution in the presence and absence of 5-(2,6-dichlorobenzyl)-6-methylpyridazin-3(2H)-one (P3) has been investigated by weight loss method. The inhibitory effect increases with increasing inhibitors concentration and decreases with rise of temperature from 303 to 343K. Adsorption follows the Langmuir isotherm with negative values of free enthalpy suggesting a spontaneous adsorption process. Other thermodynamic parameters such as, equilibrium constant, adsorption heat and adsorption entropy were obtained. The various parameters of activation determining the kinetic data such as energy, enthalpy and entropy at different concentrations of the inhibitor were evaluated and discussed.