Kinetic Studies of Glutamic Acid Oxidation by Hexavalent Chromium in Presence of Surfactants

2012 ◽  
Vol 49 (6) ◽  
pp. 481-487 ◽  
Author(s):  
Ankita Basu ◽  
Sumanta Kr. Ghosh ◽  
Rumpa Saha ◽  
Aniruddha Ghosh ◽  
Tuhin Ghosh ◽  
...  
Keyword(s):  
Glutamic Acid ◽  
Hexavalent Chromium ◽  
Kinetic Studies ◽  
Acid Oxidation

scholarly journals Thermodynamic and Kinetic Studies on Adsorption of Vanadium with Glutamic Acid

ACS Omega ◽  
2021 ◽  
Author(s):  
Hao Peng ◽  
Hongzhi Qiu ◽  
Caiqiong Wang ◽  
Binfang Yuan ◽  
Huisheng Huang ◽  
...  
Keyword(s):  
Glutamic Acid ◽  
Kinetic Studies

The Acid/Base Catalyst in the Exoglucanase/Xylanase from Cellulomonas fimi Is Glutamic Acid 127: Evidence from Detailed Kinetic Studies of Mutants

Biochemistry ◽  
1994 ◽  
Vol 33 (20) ◽  
pp. 6371-6376 ◽  
Author(s):  
Alasdair M. MacLeod ◽  
Thisbe Lindhorst ◽  
Stephen G. Withers ◽  
R. Antony J. Warren
Keyword(s):  
Glutamic Acid ◽  
Kinetic Studies ◽  
Base Catalyst ◽  
Acid Base ◽  
Cellulomonas Fimi

scholarly journals Enhanced biosorption of Cr(VI) using cotton fibers coated with chitosan – role of ester bonds

2018 ◽  
Vol 78 (3) ◽  
pp. 476-486 ◽  
Author(s):  
Sergio I. Rojas ◽  
Diana C. Duarte ◽  
Sergio D. Mosquera ◽  
Felipe Salcedo ◽  
Juan P. Hinestroza ◽  
...  
Keyword(s):  
Hexavalent Chromium ◽  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Chitosan Solution ◽  
Cotton Fibers ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Amino Groups ◽  
Removal Capacity

Abstract We report on the role of ester bonds in the enhanced removal of hexavalent chromium from water using cotton fibers coated with chitosan. Adsorption capacities up to five times higher than those of the unmodified fibers were observed when the cotton fibers were exposed to an NaOH, followed by citric acid (0.97 M), and a chitosan solution (2%). We found that the use of NaOH favors the formation of ester bonds over amide bonds on the surface of the cotton fibers. This increase in the surface density of ester bonds generates an increase in the amount of exposed amino groups from the chitosan, hence increasing the removal capacity of the modified fibers. Experimental results also reveal that the adsorption is induced by the electrostatic attraction between the protonated amino groups on the surface and the negatively charged chromium ions in the water. Adsorption isotherms and kinetic studies indicated that the adsorption process fits the Langmuir and the Freundlich isotherm models as well as the pseudo-first and pseudo-second order kinetic models. These results can open a new avenue for the manufacturing of fibers with enhanced removal capacities for hexavalent chromium.

scholarly journals Kinetic Studies of the Interaction of Toluidine Blue with Poly-(αL-glutamic acid) by Means of Stopped-Flow Method

1978 ◽  
Vol 10 (2) ◽  
pp. 153-159 ◽  
Author(s):  
Hidetoshi Ushio ◽  
Hiroshi Uchimura ◽  
Yoshikuni Tsuji ◽  
Takayuki Sano ◽  
Tatsuya Yasunaga
Keyword(s):  
Glutamic Acid ◽  
Toluidine Blue ◽  
Kinetic Studies ◽  
Stopped Flow ◽  
Flow Method

Optimization for Reduction/Precipitation Treatment of Hexavalent Chromium

1994 ◽  
Vol 29 (9) ◽  
pp. 275-284 ◽  
Author(s):  
J. W. Patterson ◽  
E. Gasca ◽  
Y. Wang
Keyword(s):  
Wastewater Treatment ◽  
Hexavalent Chromium ◽  
Treatment Plant ◽  
Kinetic Studies ◽  
Critical Parameters ◽  
Sodium Metabisulfite ◽  
Treatment Optimization ◽  
Total Chromium ◽  
Manufacturing Operations ◽  
Treatment Train

This paper describes wastewater treatment optimization studies performed on an industrial wastewater generated in Boston, Massachusetts, USA. The manufacturing plant generates hexavalent chromium [Cr(VI)] wastewater as a result of chromating brass, bronze and copper parts produced in the manufacturing operations. The facility utilizes a continuous flow treatment train, involving segregated Cr(VI) reduction with sodium metabisulfite (Na2S2O5) under acidic conditions, followed by combined wastestream two-stage pH adjustment, metals precipitation, and clarification before discharge to the municipal sewer. The objectives of the studies were to define and evaluate critical parameters, such as pH and oxidation reduction potential (ORP) for hexavalent and total chromium control and to perform treatability studies to optimize the performance of the wastewater treatment plant (WWTP). The treatability studies included Cr(VI) reduction versus Na2S2O5 dosage evaluations and corresponding chromium reduction kinetic studies, and trivalent chromium hydroxide precipitation. The Cr(VI) reduction experiments and chromic hydroxide precipitation studies were performed for three different wastewaters collected from within the manufacturing process; a high, typical, and dilute strength wastewater.

Sustainable chromic acid oxidation: solar-driven recycling of hexavalent chromium ions for quinone production by WO3nanosponge photoanodes

2018 ◽  
Vol 6 (1) ◽  
pp. 110-117 ◽  
Author(s):  
Tomohiko Nakajima ◽  
Megumi Kanaori ◽  
Aya Hagino ◽  
Hiroyuki Tateno ◽  
Tetsuo Tsuchiya ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Hexavalent Chromium ◽  
Chromic Acid ◽  
Acid Oxidation ◽  
Simulated Sunlight ◽  
Chromium Ion ◽  
Chromium Ions ◽  
Chromic Acid Oxidation

Photoelectrochemical chromium ion oxidation from the trivalent to the hexavalent state has been demonstrated by using WO3nanosponge photoanodes in sulfuric acid electrolytes under simulated sunlight.

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