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选用含钛高炉渣作为吸附剂,研究渣的投加量、粒径大小、温度以及溶液初始pH等因素对含钛高炉渣吸附水中氨氮的影响及吸附特性。动力学数据分析表明,准二级动力学模型能更好地描述含钛高炉渣对氨氮的吸附;颗粒内扩散方程拟合结果发现,含钛高炉渣对氨氮的吸附包括表面吸附和颗粒内扩散两个阶段。吸附等温线拟合表明Langmiur方程能够更好地模拟含钛高炉渣对氨氮的吸附过程。在20℃、反应时间4h的条件下,对于100mL浓度为100mg/L的氨氮溶液,8g粒径为80~120目的含钛高炉渣对氨氮的去除率可以达到32%;随着温度的升高,去除率基本呈上升趋势;溶液初始pH对氨氮的去除有一定的影响,在碱性条件下有较好的去除效果。
Titanium-bearing blast furnace slag was chosen as adsorbent to study the effect of slag dosage, particle size, temperature and initial pH of solution on the adsorption of ammonia nitrogen on titanium-containing blast furnace slag and its adsorption characteristics. The kinetic data show that quasi-second-order kinetic model can better describe the adsorption of ammonia nitrogen on the titanium-bearing blast furnace slag. The fit of the intragranular diffusion equation shows that the adsorption of ammonia nitrogen on the titanium-bearing blast furnace slag includes surface adsorption and intragranular diffusion Two stages. The adsorption isotherm fitting shows that the Langmiur equation can better simulate the adsorption of ammonia nitrogen on the titanium-bearing blast furnace slag. Under the condition of 20 ℃ and reaction time 4h, the removal rate of ammonia nitrogen from 8g titanium-containing blast furnace slag with particle size of 80-120 mesh can reach 32% for 100mL ammonia nitrogen solution with the concentration of 100mg / L. With the increase of temperature , The removal rate basically showed an upward trend; the initial pH of the solution had a certain influence on the removal of ammonia nitrogen and had a good removal effect under alkaline conditions.