Comparative and Kinetics Studies of Organo-Nano-Kaolin Clay And Organo-Nano-Bentonite Clay as the Adsorbents for the Reduction of Chromium (VI) from Tannery Effluent

2019 ◽  
pp. 31-42
Author(s):  
B. Uma Maheswari ◽  
V. M. Sivakumar ◽  
M. Thirumarimurugan
Keyword(s):  
Bentonite Clay ◽  
Kaolin Clay ◽  
Tannery Effluent ◽  
Kinetics Studies ◽  
Chromium Vi

scholarly journals Adsorption Study for Chromium (VI) on Iraqi Bentonite

2010 ◽  
Vol 7 (1) ◽  
pp. 745-756
Author(s):  
Baghdad Science Journal
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Process ◽  
Kinetic Equations ◽  
Bentonite Clay ◽  
Sorption Process ◽  
Adsorption Study ◽  
Chromium Vi ◽  
Freundlich Adsorption Isotherm ◽  
Different Temperatures ◽  
The Subject

The subject of this research involves studying adsorption to remove hexavalent chromium Cr(VI) from aqueous solutions. Adsorption process on bentonite clay as adsorbent was used in the Cr(VI) concentration range (10-100) ppm at different temperatures (298, 303, 308 and 313)K, for different periods of time. The adsorption isotherms were obtained by obeying Langmuir and Freundlich adsorption isotherm with R2 (0.9921-0.9060) and (0.994-0.9998), respectively. The thermodynamic parameters were calculated by using the adsorption process at four different temperatures the values of ?H, ?G and ?S was [(+6.582 ? +6.547) kJ.mol-1, (-284.560 ? -343.070) kJ.mol-1 and (+0.977 ? +1.117) kJ.K-1.mol-1] respectively. This data indicates the spontaneous sorption process. The kinetic study of adsorption process was studied depending on three kinetic equations: 1- Lagergren equation 2- Morris-Weber equation 3- Reichenberg equation

Effect of Process Parameters on the Adsorption of Chromium VI on a Packed Bed Column (PBC) using Vetiver (Vetiveria zizanioides)

2021 ◽  
Vol 25 (12) ◽  
pp. 53-59
Author(s):  
Pejavara Narayana Gururaj ◽  
Kulathooran Ramalakshmi ◽  
Sureshkumar Sujithra ◽  
Ravichandran Shalini
Keyword(s):  
Process Parameters ◽  
Oxygen Demand ◽  
Packed Bed ◽  
Heating Process ◽  
Tannery Effluent ◽  
Vetiveria Zizanioides ◽  
Experimental Conditions ◽  
Heated Sample ◽  
Packed Bed Column ◽  
Chromium Vi

The objective of this study is to evaluate the different process parameters on adsorption of chromium VI on a packed bed column using Vetiver (Vetiveria zizanioides) and to examine the effect of pH, Chemical Oxygen Demand (COD) and Biological Oxygen Demand (BOD) at a constant contact time of 10 minutes at a temperature of 40 ºC under two experimental conditions namely, tannery effluent with and without microwave treatment. The results revealed that microwave heating process had a higher impact on chromium (VI) adsorption than normal heating process. The pH values of microwave treated sample were found to be 6.65±0.65 when compared to normal heated sample where the pH was 4.62±0.72 when compared to the initial pH of effluent found to be 3.47±0.58. Further, a threefold reduction in BOD and COD values was observed in microwave treated vetiver sample which was around 86.73±1.43 and 107.90±2.82 mg/l respectively when compared to normal heated sample (250±1.45 and 200±2.65 mg/l respectively) and untreated effluent (780±2.53 and 920±3.86 mg/l respectively) which indicated the reduction of chromium VI present in the effluent water. It was also observed that the metal adsorption capacity of the vetiver powder and the adsorption characteristics were positively correlated with the FTIR and SEM analysis which confirmed the presence of chromium (VI) on the surface of vetiver.

Chromium (VI) Ions Removal from Tannery Effluent using Chitosan-Microcrystalline Cellulose Composite as Adsorbent

2016 ◽  
Vol 10 (4) ◽  
pp. 1-14 ◽  
Author(s):  
Shahida Yasmeen ◽  
Mrinal Kabiraz ◽  
Badhan Saha ◽  
Md. Qadir ◽  
Md. Gafur ◽  
...  
Keyword(s):  
Microcrystalline Cellulose ◽  
Tannery Effluent ◽  
Chromium Vi ◽  
Cellulose Composite

Effective Removal of Chromium (VI) Ions from Tannery Effluent using Chitosan-Alumina Composite

2016 ◽  
Vol 10 (3) ◽  
pp. 1-12 ◽  
Author(s):  
Mrinal Kabiraz ◽  
Ismet Jahan ◽  
Shah Masum ◽  
Md. Islam ◽  
S. Hassan ◽  
...  
Keyword(s):  
Tannery Effluent ◽  
Chromium Vi ◽  
Effective Removal ◽  
Alumina Composite

scholarly journals Isolation of hexavalent chromium (VI) tolerant fungi from tannery effluent and their growth responses to different concentrations of chromium (VI)

2020 ◽  
Author(s):  
Soumyajit Guha ◽  
Sampa Debnath ◽  
Saswati Gayen
Keyword(s):  
Heavy Metal ◽  
Hexavalent Chromium ◽  
Morphological Characteristics ◽  
Blue Staining ◽  
Tolerance Index ◽  
Tannery Effluent ◽  
Industrial Complex ◽  
Growth Responses ◽  
Fungal Strains ◽  
Chromium Vi

The main objective of this study was to isolate, characterize, and determine chromium (VI) tolerance capacities of fungal strains from tannery effluent of the Kolkata Leather Complex area. Chromium (VI) is a heavy metal that is known to be toxic as well as carcinogenic. It is an important heavy metal widely used in various industries of which the tanning industry deserves special mention. The majority of Cr (VI) waste is discharged into the environment annually as a consequence of industrial and manufacturing activities. Kolkata Leather Complex is an industrial complex intended to serve as a central leather-tanning complex for Kolkata located at Bantala, near East Kolkata, India. Samples (tannery effluent) were collected in sterile capped tubes from Kolkata Leather Complex Area and brought to the laboratory for analysis. The samples were serially diluted and were plated on Czapekdox agar plates and incubated at 300C. After a few days, a number of morphologically different colonies were selected and sequentially subcultured for pure colony isolation on the same medium. They were preserved in the refrigerator at 40 C. Lactophenol cotton blue staining was done to observe and record the fungal morphological characteristics. They were further assessed for their hexavalent chromium tolerance capacities and subsequently the metal tolerance index was derived for each strain respectively. All 16 fungal strains isolated from the Kolkata Leather Complex tannery area were found to be chromium (VI) tolerant starting at 0.1mg/ml Cr (VI) concentration. Maximum chromium (VI) tolerance was displayed by sample S12 (2mg/ml) which was later identified as having 99.82% similarity with Aspergillus nomius strain.Keywords: effluent, fungi, heavy metal, isolation, hexavalent chromium, tannery, tolerance.

Bioremediation of chromium(VI) by Stenotrophomonas maltophilia isolated from tannery effluent

2017 ◽  
Vol 15 (1) ◽  
pp. 207-216 ◽  
Author(s):  
N. M. Raman ◽  
S. Asokan ◽  
N. Shobana Sundari ◽  
S. Ramasamy
Keyword(s):  
Stenotrophomonas Maltophilia ◽  
Tannery Effluent ◽  
Chromium Vi

scholarly journals Investigation of Photon Radiation Attenuation Capability of Different Clay Materials

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6702
Author(s):  
Mohamed Elsafi ◽  
Yousry Koraim ◽  
Mansour Almurayshid ◽  
Fahad I Almasoud ◽  
M. I. Sayyed ◽  
...  
Keyword(s):  
Theoretical Data ◽  
Bentonite Clay ◽  
Mass Attenuation Coefficient ◽  
High Energy ◽  
Photon Radiation ◽  
Kaolin Clay ◽  
Clay Sample ◽  
Red Clay ◽  
Radiation Attenuation ◽  
Low Energies

This work aims to experimentally report the radiation attenuation factors for four different clays (red, ball, kaolin and bentonite clays) at four selected energies (emitted from Am-241, Cs-137, and Co-60). The highest relative difference in the mass attenuation coefficient (MAC) is equal to −3.02%, but most of the other results are much smaller than this value, proving that the experimental and theoretical data greatly agree with each other. From the MAC results, the shielding abilities of the clay samples at 0.060 MeV follow the order of: bentonite > red > ball > kaolin. Thus, at low energies, the bentonite clay sample provides the most effective attenuation capability out of the tested clays. The half value layer (HVL) increases as energy increases, which suggests that, only a thin clay sample is needed to sufficiently absorb the radiation at low energies, while at higher energies a thicker sample is needed to shield the same amount of high energy radiated. Furthermore, bentonite clay has the lowest HVL, while the kaolin clay has the greatest HVL at all energies. The radiation protection efficiency (RPE) values at 0.060 MeV are equal to 97.982%, 97.137%, 94.242%, and 93.583% for bentonite clay, red clay, ball clay, and kaolin clay, respectively. This reveals that at this energy, the four clay samples can absorb almost all of the incoming photons, but the bentonite clay has the greatest attenuation capability at this energy, while kaolin clay has the lowest.

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