以钙基膨润土和钢渣为原料,425型水泥为粘结剂、尿素为致孔剂,通过挤出-滚圆-焙烧法分别制备膨润土、膨润土/钢渣吸附材料,并对比研究了膨润土与膨润土/钢渣复合材料对Cu2+的吸附性能,探究其吸附机理。结果表明:当pH为5.3,初始Cu2+浓度为100mg/L时,膨润土颗粒用量为50g/L,对Cu2+的去除率达92.40%;而膨润土/钢渣颗粒用量为30g/L,对Cu2+去除率达94.31%。膨润土颗粒对Cu2+的吸附主要依靠离子交换作用,且该过程更符合拟一级动力学模型、Langmuir吸附等温模型;膨润土/钢渣颗粒对Cu2+的吸附主要依靠沉淀作用和离子交换作用,且该过程更符合拟二级动力学模型、Freundlich吸附等温模型。热力学参数计算表明这两种颗粒对Cu2+吸附是自发进行的吸热、熵增过程。
The bentonite and bentonite/steel slag adsorbent materials were prepared by the extrusion-rolling-roasting method using calcium-based bentonite and steel slag as raw materials,425 cement as binder and urea as porogenic agent.The adsorption performance of bentonite and bentonite/steel slag composites for Cu2+ was studied comparatively.The results showed that when the pH was 5.3 and the initial concentration of Cu2+ was 100mg/L,the amount of bentonite particles was 50g/L,the removal rate of Cu2+ was 92.40%,while the amount of bentonite/steel slag particles was 30g/L,the removal rate of Cu2+ was 94.31%.The adsorption of Cu2+ by bentonite particles mainly relied on ion exchange,and the process was more in line with the quasi-first-order kinetic model and the Langmuir adsorption isothermal model.The adsorption of Cu2+ by bentonite/steel slag particles mainly depended on precipitation and ion exchange,and the process confirmed better to the quasi-second-order kinetic model and the Freundlich adsorption isothermal model.The thermodynamic parameter calculations indicated that the adsorption of Cu2+ by the two particles was a spontaneous endothermic and entropy increase process.
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基金资助
国家自然科学基金(51504004);安徽省教育厅重点项目(KJ2015A118);生物膜法水质净化及利用技术教育部工程研究中心开放基金资助项目(BWPU2022KF05);大学生创新创业训练计划项目(S202310360166、S202310360156、2022005Y和2022004Z)
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