摘要
研究了竹炭对水溶液中的氨氮的吸附特性,测定了不同竹炭粒径、溶液初始氨氮浓度、pH值、吸附时间对吸附效果的影响。结果表明:在酸性条件下,pH值增大吸附量增加较快,pH值为7时吸附效果最佳;在不同氨氮初始浓度下,竹炭吸附量随着浓度增大而急剧增加;吸附时间越长,吸附量越大,6h时达到吸附平衡,竹炭饱和吸附量最高达到0.21mg/g;竹炭颗粒粒径越小,吸附效果越显著。竹炭对氨氮的等温吸附符合Freundlich吸附等温方程式;用NaOH溶液进行再生,再生次数越多吸附量显著下降,4次再生后达到原吸附量的64%。
The adsorption characteristic of bamboo charcoal for ammonia-nitrogen in water solution was studied, and the effects of granular diameter of bamboo charcoal, initial ammonia-nitrogen concentration of the solution, pH value and adsorption time on the adsorption performance were determined. The results showed that: under acidic condition, the adsorption quantity increased fast with the increasing of the pH value, the best adsorption effect was obtained when the pH value was 7; under different initial ammonia-nitrogen concentrations, the adsorption quantity of bamboo charcoal rapidly increased with the increasing of the concentration; and it also increased along with the increasing of the adsorption time, the adsorption equilibrium was reached in 6 h; the highest saturated adsorption quantity of bamboo charcoal was 0.21 mg/g; the smaller the granular diameter of bamboo charcoal was, the more prominent the adsorption effect would be. The isothermal adsorption of ammonia-nitrogen by bamboo charcoal fit the Freundlich adsorption isothermal equation; the bamboo charcoal could be regenerated by NaOH solution, with the increasing of the regeneration times, its adsorption quantity decreased notably, and was 64% of the original adsorption quantity after be regenerated 4 times.
出处
《工业用水与废水》
CAS
2009年第4期70-73,共4页
Industrial Water & Wastewater
关键词
竹炭
氨氮
吸附特性
影响因素
bamboo-charcoal
ammonia-nitrogen
adsorption characteristic
influencing factor