无机非整比复合物脱铅剂制备中烧结氧分压的影响

Influence of the Oxygen Partial Pressure (Po 2(Pa))on Sintering a New Lead-Removal Nonstoichimetric Compound

本文探讨了在制备一种新型无机非整比固体复合物脱铅剂过程中，烧结时氧分压对其内部缺陷结构及其最终的吸附性能的影响．在高氧分压区，脱铅剂中点缺陷Ｖ′ｃａ占主导地位且正比于Ｐｏ２１／４，这一点通过测量脱铅剂电导率给予了有力证明．从而说明无机非整比化合物脱铅剂中点缺陷是形成表面吸附活性位的基础；是决定其吸附性能的关键因素．

The oxygen partial pressure (Po 2(Pa))influences on the defect structure in sintering a new nonstoichimetric compound for trace leak removal is discussed . The experiment results show that the nonstoichimetric compound can reduce the lead concentration in the water below 5μg/L that is the new standard concentration in drinking water provided by Environment Protection Agency (EPA)of the U.S.A We can draw a conclusion that the point defect V ′ Ca is the main defect in the nonstoichimetric compound sintered in high oxygen partial pressure, and that it is direct ratio to the (Po 2(Pa)) 1/4 , which is proved by measuring the conductivity σ(Ω -1 cm -1 ). The adsorption surface active site number is determined by the point defect in the nonstoichimetric compound, and the adsorption mechanism in a new way has been discussed on tle basis of defecf chemistry.