Which polyacrylamide adsorbent has double network structure?

A novel polyacrylamide (PAM) / sodium alginate (SA) adsorbent with double network structure was prepared by emulsion polymerization of acrylamide (AM) and SA.

Which physical process is involved in the mixture of Pam and SA?

The mixture of PAM and SA proceeds without breaking and forming chemical bonds. Thus, physical process is involved in the mixture; that is, the interaction between PAM and SA is characterized by the entanglement of chains and hydrogen bond among special groups.

How adsorption process is affected by entanglements between Pam and SA molecular chains?

The adsorption isotherms and kinetics as well as the thermodynamics of adsorption process were also studied. The results show that due to the entanglements between PAM and SA molecular chains. A double network structure is formed. The introduction of SA leads to the decrease of thermal stability and crystallization ability of PAM.

What are the characteristics of Pam / SA microspheres?

PAM / SA showed uniform spherical shape and smooth surface. The diameter of PAM / SA microspheres varied from 1 to 10 μm. For PAM/SA composite microspheres, Na + and Ca 2+ ions exchange in SA, forming ion cross-linking structure. Ca is a special element of SA, as shown by the analysis of SA.

Which spectrometric analyzer is used to analyze Pam/SA microspheres?

2.3. Characterizations Fourier transform infrared (FTIR) spectrometric analyzer (Spectrum One-B, PerkinElmer, USA) is used to analyze the chemical structure of the PAM/SA microspheres in the range of 400–4000 cm −1 by KBr pellet technique.

What are the different types of Pam composite adsorbents?

There are many kinds of PAM composite adsorbents. Modified PAM composite adsorbents are prepared by modification of monomers with sulfonic and carboxyl functional groups, which can adsorb heavy metal ions and dyes through ion exchange, surface complexation and electrostatic attraction.