Removal of Cr(VI) ions by adsorption onto sodium alginate-polyaniline nanofibers

Rathinam, K.; Meenakshi, Sankaran

doi:10.1016/j.ijbiomac.2014.09.023

Cited by 177 publications

(67 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…When PO 4 3− and SO 4 2− existed in the system, there was a decrease in Cr(VI) adsorption from the aqueous solution. This may be due to the competition effect between the anions and chromate for the adsorption sites [55]. However, more decrease was observed in the presence of HCO 3 − , which may be attributed to the enhancement of solution pH from 4 to 7.8 in addition to the competition between HCO 3 − and chromate.…”

Section: Impact Of Co-existing Anionsmentioning

confidence: 94%

Physico-chemical study of dew melon peel biochar for chromium attenuation from simulated and actual wastewaters

Ahmadi

Kouhgardi

Ramavandi

2016

Korean J. Chem. Eng.

View full text Add to dashboard Cite

Abstract−This work introduces a biochar as novel adsorbent prepared from the dew melon peel by pyrolysis method, and demonstrates its potential for eliminating Cr(VI) from simulated and actual wastewaters. The dew melon peel biochar (DPB) was characterized by several techniques and methodologies such as, BET, SEM, FTIR, Boehm titration, ultimate analysis, and pHzpc. DPB is a microporous material with the BET specific surface area of 196 m 2 /g. The effects of different parameters including pH, amount of adsorbent, Cr(VI) concentration, and mixing time on the removal of Cr(VI) from wastewater were studied. Maximum adsorption (98.6%) was observed at pH 6 and 100 mg/L metal concentration. The equilibrium adsorption was analyzed by Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherms. Kinetic data were evaluated by pseudo-first order, pseudo-second order, intraparticle diffusion, film diffusion (Boyd), Elovich, and Avrami models. The kinetic data were best fitted to the pseudo-second order model. The Langmuir isotherm model gives the better correlation to predict the adsorption equilibrium, with a maximum adsorption capacity of 198.7 mg/g. The thermodynamic parameters showed that the adsorption of Cr(VI) was endothermic and spontaneous. Competition between the co-existing ions of Cl − , NO 3 − , SO 4 2− , PO 4 3− , and HCO 3 − on the adsorption process was studied. The efficacy of DPB was successfully examined by analyzing the removal of Cr(VI) from two industrial wastewaters. The results indicate that DPB is promising as an effective and economical adsorbent for Cr(VI) ions removal and could be repeatedly used with no significant loss of adsorption efficiency.

show abstract

Section: Impact Of Co-existing Anionsmentioning

confidence: 94%

Physico-chemical study of dew melon peel biochar for chromium attenuation from simulated and actual wastewaters

Ahmadi

Kouhgardi

Ramavandi

2016

Korean J. Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…The porosity of sodium alginate beads allows the solutes to diffuse into the beads and come in contact with the entrapped nanoparticles. In addition, alginate is nontoxic, biodegradable, non-immunogenic, and produces thermally irreversi ble and water insoluble gels (Lalhmunsiama et al 2014;Yang et al 2015;Karthik and Meenakshi 2015;Gopalakannana and Viswanathan 2015).…”

Section: Introductionmentioning

confidence: 99%

A comparative study with biologically and chemically synthesized nZVI: applications in Cr (VI) removal and ecotoxicity assessment using indigenous microorganisms from chromium-contaminated site

Ravikumar

Kumar

Rajeshwari

et al. 2015

Environ Sci Pollut Res

View full text Add to dashboard Cite

In the present communication, we report a comparative study of Cr (VI) removal using biologically synthesized nano zero valent iron (BS-nZVI) and chemically synthesized nZVI (CS-nZVI), both immobilized in calcium alginate beads. The parameters like initial Cr (VI) concentration, nZVI concentration, and the contact time for Cr (VI) removal were optimized based on Box-Behnken design (BBD) by response surface modeling at a constant pH 7. Under the optimized conditions (concentration of nZVI = 1000 mg L(-1), contact time = ∼ 80 min, and initial concentration of Cr (VI) = 10 mg L(-1)), the Cr (VI) removal by the immobilized BS-nZVI and CS-nZVI alginate beads was 80.04 and 81.08 %, respectively. The adsorption of Cr (VI) onto the surface of alginate beads was confirmed by scanning electron microscopy with energy-dispersive x-ray spectroscopy (SEM-EDX), Fourier transform infrared spectroscopy (FT-IR), and Brunauer-Emmett-Teller (BET) analysis. The applicability of the process using both the sorbents was successfully test medium Cr (VI) spiked environmental water samples. In order to assess the ecotoxic effects of nZVI, the decline in cell viability, generation of intracellular reactive oxygen species (ROS), cell membrane damage, and biouptake was studied at 1000 mg L(-1) concentration, with five indigenous bacterial isolates from chromium-contaminated lake sediments and their consortium.

show abstract

“…41 Chitosan can be considered as a prominent organic polymer for 42 the coating of magnetite. Chitosan has abundant amounts of the 43 amine (À ÀNH 2 ) group, which has a great affinity toward heavy 44 metal ions and then could be an adsorbent for Cr(VI). The preparation methods of magnetic chitosan have been reported 46 with various methods such as magnetite synthesis followed by coating [18], the incorporation of Fe(II) in chitosan followed by 48 reduction [19], and layer by layer assembly [20].…”

Section: Introductionmentioning

confidence: 99%

“…It can be concluded that the 342 adsorption of Cr(VI) by MC, PFMC and PDFMC follows the pseudo-343 second order model. The suitability of pseudo-second order on 344 adsorption of Cr(VI) by magnetic cellulose [42], alginate nanofiber 345[43], activated carbon[44], montmorillonite clay[45] and biomass…”

mentioning

confidence: 99%

A novel pyridinium functionalized magnetic chitosan with pH-independent and rapid adsorption kinetics for magnetic separation of Cr(VI)

Sakti

Narita

Sasaki

et al. 2015

Journal of Environmental Chemical Engineering

View full text Add to dashboard Cite

Removal of Cr(VI) ions by adsorption onto sodium alginate-polyaniline nanofibers

Cited by 177 publications

References 28 publications

Physico-chemical study of dew melon peel biochar for chromium attenuation from simulated and actual wastewaters

Physico-chemical study of dew melon peel biochar for chromium attenuation from simulated and actual wastewaters

A comparative study with biologically and chemically synthesized nZVI: applications in Cr (VI) removal and ecotoxicity assessment using indigenous microorganisms from chromium-contaminated site

A novel pyridinium functionalized magnetic chitosan with pH-independent and rapid adsorption kinetics for magnetic separation of Cr(VI)

Contact Info

Product

Resources

About