煤气化渣对磷酸根的吸附与解吸性能研究

煤气化渣是煤化工领域的一种固废,其大量排放对自然环境造成很大压力,对其进行资源化利用尤为重要。本研究基于煤气化渣结构特殊、比表面积较大的特点,研究了不同吸附条件对煤气化渣吸附磷酸根的影响,同时研究了煤气化渣对磷酸根的解吸及再吸附特性。结果表明,煤气化渣对磷酸根的吸附符合Langmuir等温吸附模型和拟二级动力学反应模型。在pH=7、投料量为2.5 g/L、温度为30 ℃、时间为480 min的条件下,其Langmuir饱和吸附量达到3.998 4 mg/g。此外,煤气化渣对磷酸根还具有较好的解吸效率和再吸附能力。研究表明煤气化渣具有作为磷肥缓释剂的潜力。

Study on adsorption and desorption of phosphate by coal gasification slag

Coal gasification slag is a kind of solid waste in the field of coal chemical industry,the large amount of coal gasification slag discharge causes great pressure on the natural environment so it is particularly important to resource-based utilization of it.Based on the special structure and large specific surface area of coal gasification slag,the influence of coal gasification slag on the adsorption performance of phosphate under different adsorption conditions was studied,and the desorption and re-adsorption characteristics of coal gasification slag on phosphate were also researched.Results showed that the adsorption of phosphate by coal gasification slag conforms to the Langmuir isothermal adsorption model and the pseudo-second-order kinetic reaction model.Under the adsorption conditions,such as pH of 7,feed amount of 2.5 g/L,temperature of 30℃and time of 480 min,the saturated adsorption amount of Langmuir reached 3.9984 mg/g.In addition,the coal gasification slag also has better desorption efficiency and re-adsorption capacity for phosphate.The study results showed that the coal gasification slag has the potential to be used as a sustained release agent for phosphate fertilizer.