scholarly journals Hexavalent chromium removal from aqueous solutions by using low-cost biological wastes: equilibrium and kinetic studies

2012 ◽  
Vol 9 (2) ◽  
pp. 319-326 ◽  
Author(s):  
M. Aliabadi ◽  
I. Khazaei ◽  
H. Fakhraee ◽  
M. T. H. Mousavian
Keyword(s):  
Aqueous Solutions ◽  
Hexavalent Chromium ◽  
Low Cost ◽  
Kinetic Studies ◽  
Chromium Removal ◽  
Biological Wastes

The residue of alginate extraction from Sargassum muticum (Brown seaweed) as a low-cost adsorbent for hexavalent chromium removal from aqueous solutions

2017 ◽  
Vol 75 ◽  
pp. 107-114 ◽  
Author(s):  
Z. Belattmania ◽  
S. Tahiri ◽  
F. Bentiss ◽  
A. Sahibed-dine ◽  
C. Jama ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Hexavalent Chromium ◽  
Low Cost ◽  
Brown Seaweed ◽  
Sargassum Muticum ◽  
Chromium Removal ◽  
Alginate Extraction

scholarly journals Hexavalent Chromium Removal from Groundwater—A Low-Tech Approach

2020 ◽  
Vol 2 (1) ◽  
pp. 25
Author(s):  
Samiotis Georgios ◽  
Lefteri Lefteris ◽  
Mavromatidou Charoula ◽  
Tsioptsias Costas ◽  
Trikilidou Eleni ◽  
...  
Keyword(s):  
Hexavalent Chromium ◽  
Low Cost ◽  
Water Bodies ◽  
Contaminated Water ◽  
Chromium Removal ◽  
Chromium Reduction ◽  
Complete Understanding ◽  
Pump And Treat ◽  
Reduction Mechanisms ◽  
The Creation

Chromium occurs in nature mainly in its trivalent or hexavalent form. Hexavalent chromium Cr(VI) is particularly toxic to humans, animals, and plants. The extensive pollution of groundwaters with Cr(VI) necessitates the complete understanding of natural chromium oxidation and reduction mechanisms, both for assessing the risk of hexavalent chromium formation and for the development of techniques for the reduction and removal of Cr(VI) from contaminated water bodies. In this work, the possibility of hexavalent chromium reduction by discarded or low-cost materials, which contain reducing compounds, is investigated regarding the creation of a compact, pump-and-treat filter for Cr(VI) removal from groundwater.

scholarly journals Adsorption of hexavalent chromium ions from aqueous solutions using nano-chitin: kinetic, isotherms and thermodynamic studies

2021 ◽  
Vol 16 (2) ◽  
pp. 436-451
Author(s):  
Meghdad Sheikhi ◽  
Hassan Rezaei
Keyword(s):  
Aqueous Solutions ◽  
Correlation Coefficient ◽  
Hexavalent Chromium ◽  
Contact Time ◽  
New Technology ◽  
Kinetic Studies ◽  
Chromium Vi ◽  
Effects Of Ph ◽  
Pseudo Second Order ◽  
Adsorbent Dose

Abstract Treatment of the industrial wastewater before discharging into aquatic ecosystems using a new technology such as nanotechnology seems necessary. There are different methods for the removal of the heavy metals in the wastewater. In this study, nano-chitin was purchased from the Nano-Novin Polymer Company and used as an adsorbent for the removal of chromium (VI) ions from aqueous solution in a batch system. The effects of pH, temperature, contact time, concentration, and adsorbent dose were investigated. According to the results, the optimum conditions of adsorption occurred at pH = 6, temperature = 25 °C, 60 minutes contact time, and 0.6 g·L−1 adsorbent dose. Investigation of equilibrium isotherms showed that the isotherm fitted the Freundlich model with a correlation coefficient of R2 = 0.9689. The pseudo second-order model with the larger correlation coefficient had a greater fitness against experimental data in the kinetic studies. Thermodynamic parameters such as Gibbs free energy, enthalpy, and entropy were calculated, which indicated spontaneous, endothermic, and random processes, respectively. Given the good results of this project, nano-chitin can be suggested as a novel adsorbent which is highly capable of adsorbing hexavalent chromium from aqueous solutions.

scholarly journals Application of Factorial Design for the Optimization of Hexavalent Chromium Removal Using a New Low-cost Adsorbent: Adsorption Isotherms, Thermodynamic and Kinetic Studies

2021 ◽  
Vol 12 (1) ◽  
pp. 1247-1262
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Experimental Design ◽  
Hexavalent Chromium ◽  
Low Cost ◽  
Research Work ◽  
Kinetic Studies ◽  
Factorial Experimental Design ◽  
Initial Ph ◽  
Adsorbent Dose

This research work involved using factorial experimental design techniques to investigate the adsorption of hexavalent chromium from an aqueous solution on medlar activated carbon. A 24 full factorial experimental design was employed to determine the optimum values and degree of importance of parameters: pH, initial Cr (VI) concentration, adsorbent dose, and contact time at two levels. The optimized conditions for hexavalent chromium Cr (VI) removal were at initial pH 1.5, 5 mg.L−1Cr (VI), adsorbent dose 6 mg, and 60 min adsorption time. The results predicted a good agreement between the predicted values (R2= 0.9909), as obtained by the model, and the experimental value (R2= 0.9977). The main effects and interaction effects were analyzed using analysis of variance (ANOVA), F-test and P-values to define the most important process variables affecting Cr (VI) adsorption. The most significant variables were therefore the pH of the solution and the adsorbent dose. Therefore, the present results demonstrate that medlar activated carbon should be regarded as a low-cost alternative for removing Cr (VI) from an aqueous solution. The adsorption data were evaluated by Langmuir, Freundlich, and Dubinin-Radushkevich isotherms. The results showed that the Langmuir isotherm model best describes the equilibrium adsorption with a high correlation coefficient.

scholarly journals Recent advances in hexavalent chromium removal from aqueous solutions by adsorptive methods

RSC Advances ◽  
2019 ◽  
Vol 9 (45) ◽  
pp. 26142-26164 ◽  
Author(s):  
Vusumzi E. Pakade ◽  
Nikita T. Tavengwa ◽  
Lawrence M. Madikizela
Keyword(s):  
Aqueous Solutions ◽  
Hexavalent Chromium ◽  
Chromium Removal ◽  
Recent Advances

Despite the extensive existence of adsorbents for Cr(vi) removal from aqueous solutions, new adsorbents and modification of existing adsorbing materials are continuously sought after.

Hexavalent chromium removal from aqueous solutions by a novel powder prepared fromColocasia esculentaleaves

2016 ◽  
Vol 18 (8) ◽  
pp. 812-821 ◽  
Author(s):  
E. Nakkeeran ◽  
N. Saranya ◽  
M.S. Giri Nandagopal ◽  
A. Santhiagu ◽  
N. Selvaraju
Keyword(s):  
Aqueous Solutions ◽  
Hexavalent Chromium ◽  
Chromium Removal

Core-Shell Bimagnetic Nanoadsorbents for Hexavalent Chromium Removal from Aqueous Solutions

2019 ◽  
Vol 362 ◽  
pp. 82-91 ◽  
Author(s):  
Alex Fabiano Cortez Campos ◽  
Helena Augusta Lisboa de Oliveira ◽  
Fabiana Narciso da Silva ◽  
Franciscarlos Gomes da Silva ◽  
Priscilla Coppola ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Hexavalent Chromium ◽  
Core Shell ◽  
Chromium Removal

Porous stainless steel supported magnetite crystalline membranes for hexavalent chromium removal from aqueous solutions

2012 ◽  
Vol 392-393 ◽  
pp. 150-156 ◽  
Author(s):  
Wenzhi Tang ◽  
Zhichao Peng ◽  
Lixuan Li ◽  
Tianli Yue ◽  
Jianlong Wang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Aqueous Solutions ◽  
Hexavalent Chromium ◽  
Chromium Removal ◽  
Porous Stainless Steel
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