The removal of chromium(VI) by CMC stabilized nanoscale zero-valent iron (nZVI) and the effects of reaction temperature and CMC dosage on the removal efficiency of Cr(VI) were investigated through multi-group experiments on this paper. The experiental results revealed: (1) different dosages of CMC vary the degree of impact of the removal of Cr(VI), at the concentration of 0.5 g L-1, it has the highest removal efficiency. (2)The effect of temperature on the removal efficiency is negative. The higher the temperature is, the lower will be the removal efficiency. After 120 min of treatment, the removal efficiencies of Cr(VI) at various reaction temperatures from 0, 20, 30 to 40°C were recorded as 100%, 99.75%, 97.6%, 95.75%.
The reduction of Chromium (VI) by ZVI filings in the presence of HA was carried out during our investigation. The factors such as reaction temperature, initial pH, Fe0 dosage which influencing the reaction were also researched. The results indicated that: 1. High reaction temperature was beneficial to the reaction. At the temperature of 25 oC, the Cr(VI) concentration decreased from 10 mg L-1 to 0.88 mg L-1 after 120 minutes, but at the temperature of 40 oC, the Cr(VI) concentration was reduce to 0.44 mg L-1; 2. Low initial pH was beneficial to the reaction, and the acid condition was beneficial to the reduction of Cr(VI); 3. the change of Fe0 dosage affect the reaction.
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