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Conference on Environmental Pollution and Public Health (CEPPH 2010 E-BOOK)

Wuhan,China,China,9.10-9.12,2010

ISBN: 978-1-935068-16-7 Scientific Research Publishing, USA

E-Book 1502pp Pub. Date: October 2010

Category: Engineering

Price: $80

Title: Batch Studies on Hexavalent Uranium Removal by Zerovalent Iron and Impact of Pyrite
Source: Conference on Environmental Pollution and Public Health (CEPPH 2010 E-BOOK) (pp 1259-1262)
Author(s): Zhengji Yi, Key Laboratory of Functional Organometallic Materials, Hengyang Normal University, College of Hunan Province KLFOM, HNU, CHP, Hengyang, Hunan, China；State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences
Abstract: Batch experiments were conducted under static and dynamic conditions respectively to explore the mechanism and kinetics of U(VI) immobilization by zerovalent iron (ZVI) and the impact of pyrite. The dynamic results suggest that the U(VI) immobilization reaction by ZVI shows pseudo-first order with respect to U(VI) concentration. When the initial U(VI) concentration increased from 50 to 300mg/L at a fixed ZVI loading (2%), the rate constantly decreased from 0.1776 h-1 to 0.0177 h-1. The static results show that ZVI system removed U(VI) very quickly whereas the FeS2 system did the most slowly. As for the ZVI+ FeS2 system, the U(VI) immobilization process was significantly inhibited in the presence of pyrite. The fixation of U(VI) may chiefly rely on the chemical reduction under dynamic conditions, but on the coprecipitation with iron corrosion products under static conditions. The latter process was also associated with pyrite lowering the system pH and controlling the amount of iron oxide.
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