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.

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

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.

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.

Hexavalent Chromium (VI) Removal by Aspergillus niger

2017 ◽  
pp. 673-688
Author(s):  
Ismael Acosta-Rodriguez ◽  
Juan F. Cardenas-González ◽  
María de Guadalupe Moctezuma-Zárate ◽  
Adriana Rodriguez Perez ◽  
Victor M. Martínez-Juárez
Keyword(s):  
Aspergillus Niger ◽  
Hexavalent Chromium ◽  
Chromium Vi

scholarly journals Adsorption Study for Trifluralin on Iraqi ? –Alumina

2012 ◽  
Vol 9 (1) ◽  
pp. 153-159 ◽  
Author(s):  
Baghdad Science Journal
Keyword(s):  
Adsorption Isotherm ◽  
Aqueous Solutions ◽  
Contact Time ◽  
Adsorption Process ◽  
Kinetic Equations ◽  
Adsorption Study ◽  
Adsorption Capacities ◽  
Experimental Parameters ◽  
Freundlich Adsorption Isotherm ◽  
Equilibrium Adsorption Isotherm

Equilibrium adsorption isotherm for the removal of trifluralin from aqueous solutions using ? –alumina clay has been studied. The result shows that the isotherms were S3 according Giels classification. The effects of various experimental parameters such as contact time, adsorbent dosage, effect of pH and temperature of trifluralin on the adsorption capacities have been investigated. The adsorption isotherms were obtained by obeying freundlich adsorption isotherm with (R2 = 0.91249-0.8149). The thermodynamic parameters have been calculated by using the adsorption process at five different temperature, the values of ?H, ?G and ?S were (_1.0625) kj. mol-1, (7.628 - 7.831) kj.mol-1 and (_2.7966 - _2.9162) kg. k-1. mol-1 respectively. The kinetic study of adsorption process has been studied depending on three kinetic equations: 1- Allergen equation 2- Morris –weber eguation 3- Reichenberg eguation. In general, the result shows the isotherm were on ?- alumina according to Giels classification.? –alumina and thermodynamic

The Derivation of Freundlich Adsorption Isotherm

Daxue Huaxue ◽  
2015 ◽  
Vol 30 (3) ◽  
pp. 76-79
Author(s):  
Shi Jibin ◽  
◽  
◽  
Liu Guojie
Keyword(s):  
Adsorption Isotherm ◽  
Freundlich Adsorption Isotherm
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