• 主页
  • 查找结果
  • Rapid degradation of hexachlorobenzene by micron Ag/Fe bimetal particles.

Rapid degradation of hexachlorobenzene by micron Ag/Fe bimetal particles.

Journal of environmental sciences (China) (2013-08-08)
Xiaoqin Nie, Jianguo Liu, Xianwei Zeng, Dongbei Yue
摘要

The feasibility of the rapid degradation of hexachlorobenzene (HCB) by micron-size silver (Ag)/iron (Fe) particles was investigated. Ag/Fe particles with different ratios (0, 0.05%, 0.09%, 0.20%, and 0.45%) were prepared by electroless silver plating on 300 mesh Fe powder, and were used to degrade HCB at different pH values and temperatures. The dechlorination ability of Fe greatly increased with small Ag addition, whereas too much added Ag would cover the Fe surface and reduce the effective reaction surface, thereby decreasing the extent of dechlorination. The optimal Ag/Fe ratio was 0.09%. Tafel polarization curves showed that HCB was rapidly degraded at neutral or acidic pH, whereas low pH levels severely intensified H2 production, which consumed the reducing electrons needed for the HCB degradation. HCB degradation was more sensitive to temperature than pH. The rate constant of HCB dechlorination was 0.452 min- at 85 degrees C, 50 times higher than that at 31 degrees C. HCB was degraded in a successive dechlorination pathway, yielding the main products 1,2,4,5-tetrachlorobenzene and 1,2,4-trichlorobenzene within 2 hr.

材料
货号
品牌
产品描述

Sigma-Aldrich
银, conductive paste
Sigma-Aldrich
铁, ≥99%, reduced, powder (fine)
Sigma-Aldrich
银, nanopowder, <100 nm particle size, contains PVP as dispersant, 99.5% trace metals basis
Sigma-Aldrich
羰基铁, ≥97% Fe basis
Sigma-Aldrich
铁, powder, −325 mesh, 97%
Sigma-Aldrich
银, powder, 2-3.5 μm, ≥99.9% trace metals basis
Sigma-Aldrich
银, flakes, 10 μm, ≥99.9% trace metals basis
Sigma-Aldrich
银, wire, diam. 0.5 mm, 99.9% trace metals basis
Sigma-Aldrich
铁, powder, <10 μm, ≥99.9% trace metals basis
Sigma-Aldrich
银, nanopowder, <150 nm particle size, 99% trace metals basis
Supelco
六氯苯, PESTANAL®, analytical standard
Sigma-Aldrich
银, powder, 5-8 μm, ≥99.9% trace metals basis
Supelco
六氯苯 溶液, certified reference material, 1000 μg/mL in acetone
Sigma-Aldrich
铁, puriss. p.a., carbonyl-Iron powder, low in magnesium and manganese compounds, ≥99.5% (RT)
Sigma-Aldrich
1,2,4,5-四氯苯, 98%
Sigma-Aldrich
银, wire, diam. 1.0 mm, 99.9% trace metals basis
Sigma-Aldrich
银, wire, diam. 0.5 mm, ≥99.99% trace metals basis
Sigma-Aldrich
铁, chips, 99.98% trace metals basis
Sigma-Aldrich
银, foil, thickness 0.1 mm, 99.9% trace metals basis
Sigma-Aldrich
铁, granular, 10-40 mesh, >99.99% trace metals basis
Sigma-Aldrich
银, wire, diam. 0.25 mm, ≥99.99% trace metals basis
Sigma-Aldrich
铁, foil, thickness 0.1 mm, ≥99.9% trace metals basis
Sigma-Aldrich
银, shot, 1-3 mm, ≥99.99% trace metals basis
Sigma-Aldrich
银, foil, thickness 0.25 mm, 99.9% trace metals basis
Sigma-Aldrich
铁, flakes, ≥99.99% trace metals basis
Sigma-Aldrich
银, foil, thickness 1.0 mm, 99.99% trace metals basis
Sigma-Aldrich
铁, foil, thickness 0.25 mm, ≥99.99% trace metals basis
Sigma-Aldrich
银, granular, >250 μm, 99.99% trace metals basis
Sigma-Aldrich
银, foil, thickness 0.5 mm, 99.99% trace metals basis
Sigma-Aldrich
银, powder, <250 μm, 99.99% trace metals basis