粉煤灰基免烧陶粒的表面沸石化及其对Cu^(2+)吸附性能研究

Study on Surface Zeolization and Cu^(2+) Adsorption of Fly Ash Based Non-roasting Ceramsite

本文以粉煤灰为主要原料制备了粉煤灰基免烧陶粒,主要探究了不同碱性激发剂和不同养护条件对陶粒的晶体结构、微观形貌和筒压强度的影响,并研究复合激发剂下制备的陶粒对水中Cu^(2+)吸附性能的影响。研究发现在碱性激发剂下,经过8 h蒸压养护(1 MPa、175℃)在粉煤灰陶粒表面原位合成了方沸石,且碱性激发剂的加入使陶粒的强度有明显提升,在氢氧化钠和硅酸钠配制的复合激发剂下制备的陶粒筒压强度达到4.2 MPa。对含Cu^(2+)模拟废液进行了吸附试验发现对Cu^(2+)模拟废水具有较好的吸附性能,其吸附效率可达99.6%,对Cu^(2+)吸附符合准二级动力学且与Langmuir模型拟合良好。

This work focused on preparation of fly ash based non-roasting ceramsite and functional application in waste water purification,which has a good environmental protection prospect.In this paper,the effects of different alkaline activators and different curing conditions on the crystal structure,microstructure and numerical tube pressure of the ceramsite were studied.This work also included the adsorption of heavy metal ion by ceramsite prepared with composite activator.It was found that under the condition of alkaline activator,analcime was synthesized in-situ on the surface of ceramsite after 8 h autoclaved curing(1 MPa,175 ℃),and the strength of ceramsite increased obviously with the addition of alkaline activator.The numerical tube pressure of the ceramic prepared with the compound activator prepared by sodium silicate and sodium hydroxide reached 4.2 MPa.The adsorption experiments on simulated wastewater of Cu^(2+) showed the good adsorption performance,the maximum adsorption efficiency could reach 99.6%,the adsorption of Cu^(2+) accorded with the quasi second order kinetics,the adsorption data were found by adsorption isotherm fitting,it fitted well with the Langmuir adsorption isotherm model.The experiment proves that fly ash based non-roasting ceramsite is a potential adsorbent material for heavy metal ion treatment.In addition,it also has the advantages of short production cycle and low energy consumption.