Increasing microwave absorption efficiency in ferrite based materials by doping with lead and forming composites

Liu, Ying; Li, Xiaojie; Drew, Michael G. B.; Liu, Yue

doi:10.1016/j.matchemphys.2015.06.042

Cited by 13 publications

(3 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The appearance of strong and broad peak due to OH -1 stretching (3291.69 cm ) in Azotobacter salinestris may be due to Pb adsorption. This is in confirmation with the study of Liu et al (2015) who observed that hydroxyl (-OH) stretching was the dominant metal adsorbing group. Similarly, Chug et al (2016) reported that carboxyl groups are involved in adsorption of Cr (IV) by Azotobacter beijreinckii.…”

Section: O N L I N E C O P ÿsupporting

confidence: 91%

See 1 more Smart Citation

Biosorption of lead ions by exopolysaccharide producing Azotobacter sp.

Dhevagi¹,

Priyatharshini²,

Ramya³

et al. 2021

JEB

View full text Add to dashboard Cite

Aim: Removal of lead from wastewater using Azotobacter species and optimisation of various parameters to maximise the adsorption of lead by response surface methodology as a tool. Methodology: The bacterial isolate UBI-7 recovered from sewage water irrigated soil was examined for its biosorption potential towards lead. The lead removal efficiency of Azotobacter salinestris was studied with respect to metal concentration (50-250 mg l-1), contact time (24-120 hrs), and pH (4-8).Using response surface methodology, these factors were optimized and R2 value obtained was 0.9710 for lead ions, which indicates the validity of the model. Observation with Fourier Transform Infrared (FTIR), Scanning Electron Microscope imaging (SEM) and Energy Dispersive X-ray Spectroscopic analysis (EDX) were carried out to confirm lead biosorption by Azotobacter salinestris. Results: The lead tolerant bacterium isolated from sewage water irrigated soil (UBI-7) was recognized as Azotobacter salinestris by 16S rRNA based gene sequence analysis. The highest removal percentage of Pb (61.54) was 50 mg l-1 in 72 hrs equilibration period. Interaction effect between different levels of Pb and different contact time of the solution were found to be significant. Lead biosorption by the organism was confirmed by the changes in stretching intensities of functional groups as well as appearance of strong OH stretching at 3291.69 cm-1. Images obtained from Scanning Electron Microscope and Energy Dispersive X-ray Spectroscopic studies of the bacteria (UBI-7) before and after biosorption clearly indicated lead adsorption. Interpretation: Current study proves that the functional groups of Azotobacter salinestris are involved in lead biosorption from aqueous solution which was confirmed through FTIR.EDX analysis also elucidated the lead absorption by the bacterial cells. Hence, this could be effectively utilized for decontamination of lead from the polluted environment. Key words: Azotobacter salinestris, Biosorption, Lead, Response surface methodology

show abstract

Section: O N L I N E C O P ÿsupporting

confidence: 91%

“…These changes in band group might be due to interaction lead ions with Azotobacter sp. (Liu et al, 2015). After Pb adsorption, Azotobacter salinestris exhibited alcohol ring structure (O-H stretch) and alkane (C-H stretch) at the -1 -1 band 3291.69 cm and 2929.34 cm , respectively (Fig.…”

Section: O N L I N E C O P ÿmentioning

confidence: 93%