Toxic Waste Removal from Aqueous Solutions by Polyaniline: A Radiotracer Study

Abstract

A radiotracer technique was used to study the removal of Hg(II) ions from aqueous solutions by polyaniline. It was shown that an increase in the concentration of the adsorptive (10 -10 −2 M), whereas the Langmuir isotherm was followed only at moderate concentrations. Thermal data showed that this process was endothermic in nature. The radiation stability of polyaniline was also investigated by exposing it to an 11.1 GBq (Ra/Be) source associated with a γ-dose of 1.72 Gy/h. Irradiation had practically no significant effect on the adsorption capacity of polyaniline. Desorption experiments showed that the process of Hg(II) ion adsorption by polyaniline was almost irreversible and chemisorptive in nature.

Adsorption kinetics, equilibrium and radiation effect studies of radioactive cesium by polymer‐based adsorbent

“…The slight reduction in adsorption was attributed to a possible decrease in surface area and sintering of the active sites on the surface of the solid material. Similar results of gamma irradiation on adsorption performance of polymer materials have been reported by others . The obtained results show that the irradiated polypyrole adsorbent could still adsorb 137 Cs even after irradiation of up to 200 kGy.…”

Efficient Removal of Ce(III) and Eu(III) Ions from Aqueous Solutions by Local Clay ‐A Radiotracer Study

“…In order to find out these constants a plot has been drawn between log a e vs. log C e and straight lines were found for both the systems. These linear plots confirm about the monolayer coverage of ions at the surface of both adsorbents 21 . The value of 1/n and K were 0.953 and 2.81 x 10 -2 mol g -1 (for Ce-Clay) and 0.842 and 4.46 x 10 -2 mol g -1 (for Eu-Clay) system, respectively.…”

Synthesis and strong heavy-metal ion sorption of copolymer microparticles from phenylenediamine and its sulfonate

“…1, the polymerization yield increases first and then reduces to 26.0% with increasing SPD content from zero to 100%, demonstrating a maximum yield up to 93.7% at SPD content of 5 mol%. [19][20][21][22] Apparently, an actually positive copolymerization should be responsible for the yield maximum. That is to say, the introduction of 5 mol% SPD monomer can enhance the polymerizability of mPD monomer to some extent.…”