Electrically Mediated Process for Functinal and Decorative Trivalent Chromium Electroplating: An Alternative to Hexavalent Chromium

2019 ◽  
Vol 6 (9) ◽  
pp. 51-61 ◽  
Author(s):  
Alonso Lozano-Morales ◽  
Robert Renz ◽  
John Fortman ◽  
E. Jennings Taylor
Keyword(s):  
Hexavalent Chromium ◽  
Trivalent Chromium ◽  
Chromium Electroplating

scholarly journals Morphology analysis of hexavalent chromium reduction to trivalent chromium with syrup under different pH conditions

2019 ◽  
Vol 9 (8) ◽  
Author(s):  
Zi-Fang Chen ◽  
Xu Guan ◽  
Yong-Sheng Zhao
Keyword(s):  
Hexavalent Chromium ◽  
Bound State ◽  
Trivalent Chromium ◽  
Batch Experiments ◽  
Chromium Reduction ◽  
Reaction Systems ◽  
Mn Oxide ◽  
Morphology Analysis ◽  
Ph Conditions

Abstract Batch experiments were designed to ascertain the morphology and valence of chromium in the reduction of hexavalent chromium with syrup under different pH conditions. Results indicated that the syrup reduced hexavalent chromium to trivalent chromium, and the existing forms of Cr were mainly Cr(OH)3, CrOOH and CrOOH–Fe. The percentage of Fe–Mn oxide-bound state was 29.28%, 29.28%, 22.22% and 20.12%, respectively, and the percentage of organic binding state was 64.71%, 66.58%, 74.74% and 73.14%, respectively, in the reaction systems at different pH (2.0, 2.5, 3.0 5.6) conditions.

scholarly journals Distribution of chromium in rats exposed to hexavalent chromium and trivalent chromium aerosols.

1984 ◽  
Vol 22 (4) ◽  
pp. 261-277 ◽  
Author(s):  
Yasutomo SUZUKI ◽  
Katsunori HOMMA ◽  
Masayasu MINAMI ◽  
Hiroshi YOSHIKAWA
Keyword(s):  
Hexavalent Chromium ◽  
Trivalent Chromium

scholarly journals Combination of interfacial reduction of hexavalent chromium and trivalent chromium immobilization on tin-functionalized hydroxyapatite materials

2021 ◽  
Vol 539 ◽  
pp. 148227 ◽  
Author(s):  
Sebastiano Campisi ◽  
Claudio Evangelisti ◽  
Georgeta Postole ◽  
Antonella Gervasini
Keyword(s):  
Hexavalent Chromium ◽  
Trivalent Chromium

Selection and Impact Mechanism of Washing Agents for Chromium Contaminated Building Waste

2012 ◽  
Vol 178-181 ◽  
pp. 1083-1092
Author(s):  
Xing Run Wang ◽  
Yan Xia Zhang ◽  
Jian Min Shu
Keyword(s):  
Particle Size ◽  
Citric Acid ◽  
Organic Acid ◽  
Hexavalent Chromium ◽  
Removal Rate ◽  
Trivalent Chromium ◽  
Acid Condition ◽  
Impact Mechanism ◽  
Removal Mechanisms

With the building wastes contaminated by chromium in Haibei Chemical Plan in China as objects, it studied the contents of total Cr and Cr (Ⅵ) of different sizes, analyzed the effect of 6 different washing agents, discussed the removal mechanisms of 6 different washing agents for Cr in various forms, and finally selected applicable washing agent. As the results, particle size had little impact on the contents of total Cr and Cr (Ⅵ); after one washing with water, the removal rate of total Cr and Cr (Ⅵ) was 75% and 78%, respectively, and after the second washing with 6 agents, the removal rate of citric acid was the highest, above 90% for total Cr and above 99% for hexavalent chromium; the pH of building wastes were reduced by citric acid, and under acid condition, hexavalent chromium was reduced to trivalent chromium spontaneously by organic acid, which led to better removal rate of acid soluble Cr and reducible Cr; due to the complexing action, citric acid had best removal rate for oxidizable trivalent chromium. In conclusion, citric acid is the most applicable second washing agent for building wastes.

Effect of Various Operating Parameters on Trivalent Chromium Electroplating

2017 ◽  
Vol 13 (3) ◽  
pp. 1-9 ◽  
Author(s):  
Md Haque ◽  
Md Hoque ◽  
Md Islam ◽  
Md Islam ◽  
Chand Mustafa
Keyword(s):  
Trivalent Chromium ◽  
Operating Parameters ◽  
Chromium Electroplating
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