Reduction of hexa-valent chromium with zero-valent iron: Batch kinetic studies and rate model

被引：83

作者：

Mitra, Pallavi ^{[1
]}

Sarkar, Debasish ^{[1
]}

Chakrabarti, Sampa ^{[1
]}

Dutta, Binay K. ^{[2
]}

机构：

[1] Univ Calcutta, Dept Chem Engn, Kolkata 700009, India

[2] Petr Inst, Dept Chem Engn, Abu Dhabi, U Arab Emirates

来源：

CHEMICAL ENGINEERING JOURNAL | 2011年 / 171卷 / 01期

关键词：

Hexavalent chromium; Chromium remediation; Zero-valent iron; Passivation of iron; Kinetic model; PERMEABLE REACTIVE BARRIER; HEXAVALENT CHROMIUM; AQUEOUS-SOLUTIONS; ZEROVALENT IRON; WASTE-WATER; PHOTOCATALYTIC PROPERTIES; SUBSURFACE REMEDIATION; CHROMATE REDUCTION; CR(VI) REDUCTION; REMOVAL;

D O I：

10.1016/j.cej.2011.03.037

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Reduction of hexa-valent chromium in aqueous solution by zero-valent iron in the form of a thin plate over a pH range of 3-5.5 has been investigated. The rate of removal of Cr(VI) declines sharply at a longer time indicating passivation of the surface. A kinetic model that takes into account the direct reduction, the passivation process and the resultant decline of the 'active' surface area of reaction is proposed. The model parameters have been estimated by global optimization at each of the pH values. The reduction reaction conforms to 2/3-order kinetics with respect to the Cr(Vi) concentration; the passivation reaction is linear in the Cr(VI) concentration. A good match of the experimental and theoretically computed concentrations as function of time was observed. The EDX of the reacted surface showed existence of a mixed oxide layer on it. A reacted plate, after cleaning of the surface, regained its original activity. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：54 / 60

页数：7

共 39 条

[21] Kinetics of soluble chromium removal from contaminated water by zerovalent iron media: Corrosion inhibition and passive oxide effects [J].

Melitas, N ;

Chuffe-Moscoso, O ;

Farrell, J .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2001, 35 (19) :3948-3953

[22] Activated carbons and low cost adsorbents for remediation of tri- and hexavalent chromium from water [J].

Mohan, Dinesh ;

Pittman, Charles U., Jr. .

JOURNAL OF HAZARDOUS MATERIALS, 2006, 137 (02) :762-811

[23] Iron-doped titania powders prepared by a sol-gel method.: Part II:: Photocatalytic properties [J].

Navío, JA ;

Testa, JJ ;

Djedjeian, P ;

Padrón, JR ;

Rodríguez, D ;

Litter, MI .

APPLIED CATALYSIS A-GENERAL, 1999, 178 (02) :191-203

[24] A study on the Cr(VI) removal from aqueous solutions by steel wool [J].

Ozer, A ;

Altundogan, HS ;

Erdem, M ;

Tumen, F .

ENVIRONMENTAL POLLUTION, 1997, 97 (1-2) :107-112

[25] OPTIMIZATION FOR REDUCTION/PRECIPITATION TREATMENT OF HEXAVALENT CHROMIUM [J].

PATTERSON, JW ;

GASCA, E ;

WANG, Y .

WATER SCIENCE AND TECHNOLOGY, 1994, 29 (09) :275-284

[26] Remediation of Cr(VI) and Pb(II) aqueous solutions using supported, nanoscale zero-valent iron [J].

Ponder, SM ;

Darab, JG ;

Mallouk, TE .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 2000, 34 (12) :2564-2569

[27] COUPLED IRON CORROSION AND CHROMATE REDUCTION - MECHANISMS FOR SUBSURFACE REMEDIATION [J].

POWELL, RM ;

PULS, RW ;

HIGHTOWER, SK ;

SABATINI, DA .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1995, 29 (08) :1913-1922

[28] Products of chromate reduction on proposed subsurface remediation material [J].

Pratt, AR ;

Blowes, DW ;

Ptacek, CJ .

ENVIRONMENTAL SCIENCE & TECHNOLOGY, 1997, 31 (09) :2492-2498

[29] Long-term performance monitoring for a permeable reactive barrier at the US Coast Guard Support Center, Elizabeth City, North Carolina [J].

Puls, RW ;

Blowes, DW ;

Gillham, RW .

JOURNAL OF HAZARDOUS MATERIALS, 1999, 68 (1-2) :109-124

[30] Chromium(III) hydroxide solubility in the aqueous Na+-OH--H2PO-4-HPO24--PO34--H2O system:: A thermodynamic model [J].

Rai, D ;

Moore, DA ;

Hess, NJ ;

Rao, L ;

Clark, SB .

JOURNAL OF SOLUTION CHEMISTRY, 2004, 33 (10) :1213-1242

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