1. Result and discussion
1.1. Characterization of PUF and removal of Fe+3 on PUF
1.1.1. Characterization of PUF
1.1.1.1. Hydrolysis of white PUF using HCl
The mass lost after 24 h in HCl concentration by the PUF was 0.45%. was i.e., with increasing acid concentration and some groups of the PUF the percentage loss of mass increased were hydrolysed. The cube shape of PUF was affected by acid washing i.e.the size of the cubes became smaller and they packed more closely together (Moawed, 2008).
1.1.1.2. Density of acid treatment PUF
After hydrolysis the density of the PUF was measured. The density increased from 12 kg m3- for the white PUF to 14.09 kg m3- after hydrolysis with concentrated HCl. The density was increased by increasing the concentration of the acid used for washing. The obtained data in table2 confirm that the mass and size of the cubes of PUF decreased and that PUF after hydrolysis is denser than normal PUF because of hydrolysis of some of its reactive groups and protonation of basic groups.
1.1.1.3. IR of acid treatment PUF
The FTIR spectra of acid treated white PUF and PUF are. The characteristic absorptions peaks of the PUF are observed at 3419.cm-1 …show more content…
The time required for completing adsorption Fe+3 on PUF (90%) onto PUF 10 minutes (Figure.3.1.4). This rapid sorption rate of Fe+3 on PUF is due to the strong bond formation with the PUF. The initial removal rate of Fe+3is very fast, where ~85% of the Fe+3 on PUF removal from the tested solutions at the first 10 minutes. Then the rate slowed down progressively with time and the equilibrium extraction is reached within a period of 20 min. In the beginning all the active sites entered the binding sites easily. With the progress of the reaction, the binding sites become saturated and the sorption process becomes slower. The obtained data indicates that the removal rate rely on how the reaction between PUF and Fe+3
1.1. Characterization of PUF and removal of Fe+3 on PUF
1.1.1. Characterization of PUF
1.1.1.1. Hydrolysis of white PUF using HCl
The mass lost after 24 h in HCl concentration by the PUF was 0.45%. was i.e., with increasing acid concentration and some groups of the PUF the percentage loss of mass increased were hydrolysed. The cube shape of PUF was affected by acid washing i.e.the size of the cubes became smaller and they packed more closely together (Moawed, 2008).
1.1.1.2. Density of acid treatment PUF
After hydrolysis the density of the PUF was measured. The density increased from 12 kg m3- for the white PUF to 14.09 kg m3- after hydrolysis with concentrated HCl. The density was increased by increasing the concentration of the acid used for washing. The obtained data in table2 confirm that the mass and size of the cubes of PUF decreased and that PUF after hydrolysis is denser than normal PUF because of hydrolysis of some of its reactive groups and protonation of basic groups.
1.1.1.3. IR of acid treatment PUF
The FTIR spectra of acid treated white PUF and PUF are. The characteristic absorptions peaks of the PUF are observed at 3419.cm-1 …show more content…
The time required for completing adsorption Fe+3 on PUF (90%) onto PUF 10 minutes (Figure.3.1.4). This rapid sorption rate of Fe+3 on PUF is due to the strong bond formation with the PUF. The initial removal rate of Fe+3is very fast, where ~85% of the Fe+3 on PUF removal from the tested solutions at the first 10 minutes. Then the rate slowed down progressively with time and the equilibrium extraction is reached within a period of 20 min. In the beginning all the active sites entered the binding sites easily. With the progress of the reaction, the binding sites become saturated and the sorption process becomes slower. The obtained data indicates that the removal rate rely on how the reaction between PUF and Fe+3