制革污泥铬形态表征

Morphological characterization of chromium in tannery sludge

使用Cr-K评估了两个不同区域中Cr(III)周围不同类型聚合物结构的百分比-EXAFS和XANES光谱仪。揭示了在热退火后,Cr(VI)离子的数量得以保留并参与玻璃基质的形成。即使Cr(III)是玻璃改性剂,Cr(III)-八面体的局部配位也会在热处理时发生变化。Cr(VI)的存在表明玻璃化过程抑制Cr(III)氧化的能力有限,但是Cr(VI)安全地捕获在玻璃和玻璃陶瓷基体中。

EXAFS and XANES spectrometers were used to evaluate the percentage of different polymer structures around Cr(III)in two different regions.It is revealed that the amount of Cr(VI)ions can be retained and participate in the formation of glass matrix after thermal annealing.Even if Cr(III)is a glass modifier,the local coordination of Cr(III)-octahedron will change during heat treatment.The existence of Cr(VI)indicates that the ability of vitrification to inhibit the oxidation of Cr(III)is limited,but Cr(VI)is safely trapped in glass and glass ceramic matrix.