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Characterisation of acidic sites of Pseudomonas biomass capable of binding protons and cadmium and removal of cadmium via biosorption

Content Provider	Springer Nature Link
Author	Komy, Zanaty R. Gabar, Rabei M. Shoriet, Ahmed A. Mohammed, Rehab M.
Copyright Year	2006
Abstract	The ability of Pseudomonas aeruginosa to accumulate Cd(II) ions from wastewater industries was experimentally investigated and mathematically modelled. From the potentiometric titration and non-ideal competitive analysis (NICA) model, it was found that the biomass contains three acidic sites. The values of proton binding (pK $_{ i }$=1.66±3.26×10$^{−3}$, 1.92±1.63×10$^{−4}$ and 2.16±3.79×10$^{−4}$) and binding constant of cadmium metal ions (pK $_{M1}$=1.99±2.45×10$^{−3}$ and pK $_{M2}$=1.67±4.08×10$^{−3}$) on the whole surface of biomass showed that protonated functional groups and biosorption of Cd(II) ions could be attributed to a monodentate binding to one acidic site, mainly the carboxylic group. From the isothermal sorption experimental data and Langmuir model, it was also found that the value of Langmuir equilibrium (pK $_{f}$) constant is 2.04±2.1×10$^{−5}$ suggesting that the carboxyl group is the main active binding site. In addition, results showed that the maximum cadmium capacity (q $_{max}$) and affinity of biomass towards cadmium metal ions (b) at pH 5.1 and 20 min were 96.5±0.06 mg/g and 3.40×10$^{−3}$± 2.10×10$^{−3}$, respectively. Finally, interfering metal ions such as Pb(II), Cu(II), Cr(III), Zn(II), Fe(II), Mn(II), Ca(II) and Mg(II) inhibited Cd(II) uptake. Comparing the biosorption of Cd(II) by various Pseudomonas isolates from contaminated environment samples (soil and sewage treatment plant) showed that maximum capacities and equilibrium times were different, indicating that there was a discrepancy in the chemical composition between biomasses of different strains.
Starting Page	975
Ending Page	982
Page Count	8
File Format	PDF
ISSN	09593993
Journal	World Journal of Microbiology and Biotechnology
Volume Number	22
Issue Number	9
e-ISSN	15730972
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2006-03-23
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	acidic sites Biosorption Cd(II) proton and binding constants Pseudomonas aeruginosa sorption isotherm
Content Type	Text
Resource Type	Article
Subject	Physiology Medicine Applied Microbiology and Biotechnology Biotechnology

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