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摘要: 以吸附磷酸盐的镧改性凹凸棒土为研究对象,通过试验研究了pH、再生时间、再生温度及再生次数对镧改性凹凸棒土再生效果的影响。结果表明:碱性条件有利于改性凹凸棒土的再生,pH为8时,再生效果最佳;再生时间为30 min时,再生率超过90%,继续增加再生时间,再生率增长缓慢;再生温度升高会增加改性凹凸棒土的再生率及损失率,30 ℃时再生率较高、损失率较低;再生6次后改性凹凸棒土的性能破坏严重。综合考虑,改性凹凸棒土的最佳再生条件是pH为8,再生温度为30 ℃,再生时间为30 min,再生次数为6次。Abstract: The effects of regeneration pH, time , temperature and regeneration times on the regeneration effect of Lanthanum modified attapulgite (La-ATP) were studied by experiments. The results showed that the alkaline condition was beneficial to La-ATP regeneration. The ideal regeneration rate and loss rate could be achieved at pH 8. The regeneration rate was higher than 90% after 30 min regeneration. Slight increasing of regeneration rate was found when regeneration time was more than 30 minutes. The increase of regeneration temperature enriched the regeneration rate and loss rate of La-ATP. The regeneration rate was higher and the loss rate was lower at 30 ℃. The properties of attapulgite were seriously damaged after 6 times of regeneration. Considering comprehensively, the optimum regeneration conditions were as follows: pH=8, regeneration temperature 30 ℃, regeneration time 30 min, regeneration times 6.
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Key words:
- attapulgite /
- composite modification /
- adsorption /
- regeneration
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