STABILIZATION OF CHROMIUM IN THE FORM OF MIXED Fe(III)-Cr(III) HYDROXIDES

被引：0

作者：

Papassiopi, Nymphodora ^{[1
]}

Gaitanarou, Zoi ^{[1
]}

Xenidis, Anthimos ^{[1
]}

机构：

[1] Natl Tech Univ Athens, Sch Min & Met Engn, Athens 15780, Greece

来源：

FRESENIUS ENVIRONMENTAL BULLETIN | 2012年 / 21卷 / 8B期

关键词：

chromate reduction; ferrous iron; Fe(III)-Cr(III) hydroxides; chromium stabilization; SOLUBILITY; REDUCTION; KINETICS; REMOVAL;

D O I：

暂无

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Pollution by hexavalent chromium, contained in industrial waste, can cause serious environmental and health problems. Research has led to the development of quite a few stabilizing techniques, among which the most effective is the reduction of Cr(VI) by Fe(II) salts. Chromate, when reduced to the trivalent state, precipitates in the form of an amorphous Cr(III) hydroxide. When the reductant is ferrous iron the final product is a mixed Fe(III)-Cr(III) hydroxide, with increased stability compared to the simple chromium hydroxide. All previous experimental studies were carried out at 25 degrees C, and the solubility of solids was determined without applying any thermal treatment or aging procedure. During the present experimental work, Cr(OH)(3) alone and mixed Cr(OH)(3) - Fe(OH)(3) precipitates were produced at higher precipitation temperatures (40-70 degrees C) and/or submitted to aging in order to investigate the effect of these parameters on the crystallinity, the chemical characteristics and the solubility of solids. These tests showed that all solids were amorphous. The hydrothermal aging procedure applied on the Cr(III) hydroxides had a positive effect on their stability compared to freshly prepared hydroxides that lacked any aging process. The Fe(III)-Cr(III) hydroxides presented even lower solubility, with total Cr concentrations below drinking water limit at pH values greater than 4.5. However, the application of higher temperatures had no effect on the stability of mixed hydroxides.

引用

页码：2399 / 2405

页数：7

共 50 条

[41] Amphoteric metallic hydroxides Part III Chromium hydroxide.
Wood, JK
Black, VK
JOURNAL OF THE CHEMICAL SOCIETY, 1916, 109 : 164 - 171
[42] Pigment based on copricipitated chromium (III) and copper (II) hydroxides
Pishch, I.V.
Radion, E.V.
Sokolovskaya, D.M.
Popovskaya, N.F.
Steklo i Keramika, 1996, (07): : 21 - 23
[43] A pigment based on coprecipitated chromium(III) and copper(II) hydroxides
Pishch, IV
Radion, EV
Sokolovskaya, DM
Popovskaya, NF
GLASS AND CERAMICS, 1996, 53 (7-8) : 211 - 213
[44] REACTION OF GELATIN WITH Cr(III), Al(III) AND Fe(III): INVESTIGATION BY SPECTROFLUORIMETRY
Jiping, Chen
Ying, Gong
Wuyong, Chen
JOURNAL OF THE SOCIETY OF LEATHER TECHNOLOGISTS AND CHEMISTS, 2008, 92 (06): : 245 - 249
[45] Reaction of gelatin with Cr(III), Al(III) and Fe(III): Investigation by spectrofluorimetry
Key Laboratory of Leather Chemistry and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, China
J Soc Leather Technol Chem, 2008, 6 (245-249):
[46] Cr(III)/Al(III)/Fe(III) ion binding on mixed bed ion exchangers. Synergistic effects of the resins behaviour
Petruzzelli, D
Tiravanti, G
Passino, R
REACTIVE & FUNCTIONAL POLYMERS, 1996, 31 (02): : 179 - 185
[47] COMPLEXES OF MN(II), CR(III) AND FE(III) WITH THIOCARBOHYDRAZONES
SHIVAPRASAD, KH
PATIL, SA
PATIL, BR
KULKARNI, VH
ACTA CHIMICA HUNGARICA-MODELS IN CHEMISTRY, 1986, 122 (02): : 169 - 173
[48] ADSORPTION OF CHROMIUM(VI) ON MIXED HYDROXIDE OF IRON(III) AND BISMUTH(III)
ISHINO, F
MUNEMORI, M
NIPPON KAGAKU KAISHI, 1984, (04) : 569 - 573
[49] SYNTHESIS AND CHARACTERIZATION OF SOME NEW MIXED-LIGAND COMPLEXES OF CR(III), MN(II) AND FE(III)
SHARMA, S
NATIONAL ACADEMY SCIENCE LETTERS-INDIA, 1987, 10 (02): : 63 - 66
[50] Tuning the selectivity of two chemosensors to Fe(III) and Cr(III)
Mao, Jie
Wang, Lina
Dou, Wei
Tang, Xiaoliang
Yan, Yong
Liu, Weishen
ORGANIC LETTERS, 2007, 9 (22) : 4567 - 4570

← 1 2 3 4 5 →