Removal of chromium(VI) from contaminated drinking water by ecofriendly adsorbent: equilibrium, isotherm and kinetic study

2009 ◽  
Vol 9 (6) ◽  
pp. 671-679 ◽  
Author(s):  
S. P. Dubey ◽  
K. Gopal
Keyword(s):  
Drinking Water ◽  
Hexavalent Chromium ◽  
Batch Process ◽  
Maximum Adsorption Capacity ◽  
Agitation Rate ◽  
Synthetic Sample ◽  
Chromium Vi ◽  
Process Effects ◽  
Freundlich Adsorption Isotherm ◽  
Contaminated Drinking Water

Hexavalent chromium in drinking water is reported as well known carcinogen. This paper examines an efficient adsorption process of Cr(VI) from drinking water. The ability of developed Eucalyptus (Eucalyptus globulus) bark carbon as an adsorbent for Cr(VI) removal from synthetic sample was studied. The experiments were done in the batch process. Effects of adsorbent quantity, pH, contact time, initial Cr(VI) concentration and agitation rate were investigated on removal of chromium(VI). Approximately 95% of hexavalent chromium (10 mg L−1) was removed at pH 3 within 21 hours at 150 rpm and the concentration reached upto permissible limit recommended by standard agencies. The results indicate that the Langmuir model fits the data better than the Freundlich adsorption isotherm model. The adsorption follows second order kinetics for Cr(VI) removal in this study. The maximum adsorption capacity of 23 mg g−1 was found for the Cr(VI) adsorption. Characterization of the developed adsorbent was performed by SEM and EDX analysis and the results of the characterization supported surface nature and composition of the adsorbent.

scholarly journals Analysis of Cancer Mortality Data from Five Villages in China with Hexavalent Chromium-Contaminated Drinking Water

2006 ◽  
Vol 163 (suppl_11) ◽  
pp. S115-S115 ◽  
Author(s):  
J Beaumont ◽  
R Sedman ◽  
S Reynolds ◽  
C Sherman ◽  
L-H Li ◽  
...  
Keyword(s):  
Drinking Water ◽  
Hexavalent Chromium ◽  
Cancer Mortality ◽  
Mortality Data ◽  
Contaminated Drinking Water

Experiment Study on Treatment of Chromium(VI)-Containing Groundwater by Modified Synthetic Zeolite

2012 ◽  
Vol 430-432 ◽  
pp. 1253-1256 ◽  
Author(s):  
Yu Jie Huang ◽  
Huan Zhen Zhang
Keyword(s):  
Adsorption Isotherm ◽  
Hexavalent Chromium ◽  
Treatment Effect ◽  
Synthetic Zeolite ◽  
Experiment Study ◽  
Ph Adjustment ◽  
Modified Zeolite ◽  
Solid Ratio ◽  
Chromium Vi ◽  
Freundlich Adsorption Isotherm

In order to improve the removal ability of hexavalent chromium on the synthetic zeolite, the synthetic zeolite was modified by FeSO4, which was used to removal hexavalent chromium in groundwater. The results showed that the concentration of Cr (VI) can be reduced from 5.0mg/l to 0.03 mg/l, which meets the requirements of groundwater standards (0.05mg/l) by using modified zeolite in a liquid-to-solid ratio of 20 ml/g, pH=3 for 120 minutes. The adsorption of Cr (VI) on the modified synthetic zeolite could be described by the Langmuir and Freundlich adsorption isotherm. It is showed that the synthetic zeolite modified by FeSO4 has good treatment effect and after treatment the pH of groundwater can reach around 6.8, which need no more pH adjustment.

A Regional Comparative Study on Arsenic Contaminated Drinking Water in Bangladesh

2010 ◽  
Vol 40 (3) ◽  
pp. 763-777
Author(s):  
Sho SHIBATA ◽  
Yoshimi HAGIHARA ◽  
Kiyoko HAGIHARA ◽  
Akira SAKAI
Keyword(s):  
Drinking Water ◽  
Comparative Study ◽  
Contaminated Drinking Water

Protective Effect of Hypericum perforatum L. Extract on Hexavalent Chromium Induced Toxicity in Rat Adrenal Gland

2017 ◽  
Vol 68 (9) ◽  
pp. 2014-2017
Author(s):  
Jelena Savici ◽  
Oana Maria Boldura ◽  
Cornel Balta ◽  
Diana Brezovan ◽  
Florin Muselin ◽  
...  
Keyword(s):  
Drinking Water ◽  
Adrenal Gland ◽  
Hexavalent Chromium ◽  
Structural Damage ◽  
Hypericum Perforatum ◽  
Adrenal Glands ◽  
Expression Level ◽  
Apoptotic Pathway ◽  
Hypericum Perforatum L ◽  
Induction Of Apoptosis

This study was carried out to test the possibility of hexavalent chromium administration through drinking water to induce the structural damage in rat�s adrenal glands and the possibility of Hypericum perforatum extract to faith against chromium aggression. Chromium induced cellular stress was determined by the expression level assessment of the Bcl2 genes family, known to modulate the apoptotic pathway. Obtained results showed that exposure to chromium altered adrenal glands morphology, by induction of apoptosis. When Hypericum perforatum extract was administered expression level of Bcl2 genes and histological lesions in adrenal glands were significantly reduced.

Breakthrough analysis for hexavalent chromium removal from drinking water in a fixed bed column

2009 ◽  
Vol 9 (6) ◽  
pp. 661-670 ◽  
Author(s):  
S. P. Dubey ◽  
K. Gopal
Keyword(s):  
Aqueous Solution ◽  
Hexavalent Chromium ◽  
Fixed Bed ◽  
Entropy Change ◽  
Spectroscopic Technique ◽  
Fixed Bed Column ◽  
Chromium Vi ◽  
Fixed Bed Adsorption ◽  
Optimal Column ◽  
Eucalyptus Bark

The activated carbon of Eucalyptus globulus was tested for their effectiveness in removing hexavalent chromium from aqueous solution using column experiments. Result revealed that adsorption of chromium(VI) on eucalyptus bark carbon was endothermic in nature. Thermodynamic parameters such as the entropy change, enthalpy change and Gibbs free energy change were found to be 1.39 kJ mol−1 K−1, 1.08 kJ mol−1 and −3.85 kJ mol−1, respectively. Different chromium concentrations were used for the fixed bed adsorption studies. The pre- and post-treated adsorbents were characterized using a FTIR spectroscopic technique. It was concluded that Eucalyptus bark carbon column could be used effectively for removal of hexavalent chromium from aqueous solution at optimal column conditions. This study showed that this biological material is potential adsorbent of Cr(VI) from water.

MOFs for the treatment of arsenic, fluoride and iron contaminated drinking water: A review

Chemosphere ◽  
2020 ◽  
Vol 251 ◽  
pp. 126388 ◽  
Author(s):  
Dibyajyoti Haldar ◽  
Prangan Duarah ◽  
Mihir Kumar Purkait
Keyword(s):  
Drinking Water ◽  
Contaminated Drinking Water

scholarly journals Sustainable Chromium (VI) Removal from Contaminated Groundwater Using Nano-Magnetite-Modified Biochar via Rapid Microwave Synthesis

Molecules ◽  
2020 ◽  
Vol 26 (1) ◽  
pp. 103
Author(s):  
Xiaoming Song ◽  
Yuewen Zhang ◽  
Nan Cao ◽  
Dong Sun ◽  
Zhipeng Zhang ◽  
...  
Keyword(s):  
Synthesis Method ◽  
Microwave Treatment ◽  
Contaminated Groundwater ◽  
Maximum Adsorption Capacity ◽  
Intraparticle Diffusion Model ◽  
Adsorption Mechanisms ◽  
Chromium Vi ◽  
Modified Biochar ◽  
Pseudo Second Order ◽  
Nano Fe3o4

This study developed a nano-magnetite-modified biochar material (m-biochar) using a simple and rapid in situ synthesis method via microwave treatment, and systematically investigated the removal capability and mechanism of chromium (VI) by this m-biochar from contaminated groundwater. The m-biochar was fabricated from reed residues and magnetically modified by nano-Fe3O4. The results from scanning electron microscopy (SEM) and X-ray diffraction (XRD) characterisations confirmed the successful doping of nano-Fe3O4 on the biochar with an improved porous structure. The synthesised m-biochar exhibited significantly higher maximum adsorption capacity of 9.92 mg/g compared with that (8.03 mg/g) of the pristine biochar. The adsorption kinetics followed the pseudo-second-order model and the intraparticle diffusion model, which indicated that the overall adsorption rate of Cr(VI) was governed by the processes of chemical adsorption, liquid film diffusion and intramolecular diffusion. The increasing of the pH from 3 to 11 significantly affected the Cr(VI) adsorption, where the capabilities decreased from 9.92 mg/g to 0.435 mg/g and 8.03 mg/g to 0.095 mg/g for the m-biochar and pristine biochar, respectively. Moreover, the adsorption mechanisms of Cr(VI) by m-biochar were evaluated and confirmed to include the pathways of electrostatic adsorption, reduction and complexation. This study highlighted an effective synthesis method to prepare a superior Cr(VI) adsorbent, which could contribute to the effective remediation of heavy metal contaminations in the groundwater.

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