摘要
为探究废弃水泥基材料对农业灌溉水中Cd^(2+)吸附剂的效果,制备了一种具有疏松的多孔镂空结构的粉煤灰-水泥泡沫混凝土粉末。分析了pH、温度、吸附时间、投放量、Cd^(2+)浓度对其吸附农业灌溉水中Cd2+效果的影响,并利用FT-IR、XRD检测了材料在吸附前后的官能团变化及矿物组成变化。水泥基材料主要通过物理表面吸附和离子交换吸附,吸附过程符合二级吸附动力学和Langmuir模型,为自发的放热过程。在pH值为4.0,投加量为1.0 g/L时,多孔水泥废弃物的饱和吸附量可达9.8 mg/g。本研究为利用废弃的水泥基材料吸附农业灌溉水中Cd2+的实际应用提供了基础研究数据支持。
In order to explore the effect of waste cement-based materials on Cd2+adsorbent in agricultural irrigation water,a kind of fly ash-cement foam concrete solid waste with loose porous hollow structure was selected to prepare powder.The effects of pH,temperature,adsorption time,dosage and Cd2+concentration on the adsorption effect of Cd^(2+)in agricultural irrigation water were explored.FT-IR and XRD were used to detect the functional group change and mineral composition change of the material before and after adsorption.The results showed that the cement-based material mainly adopts physical surface adsorption and ion exchange adsorption.The adsorption process conforms to the second-order adsorption kinetics.The adsorption effect increases When pH is 4.0,the theoretical maximum adsorption capacity can reach 9.8 mg/g.It provides basic research data support for the practical application of waste cement-based materials to adsorb Cd2+in agricultural irrigation water.
作者
符式锦
何书海
吴岳俊
王海妹
FU Shijin;HE Shuhai;WU Yuejun;WANG Haimei(Hainan Ecological Environment Monitoring Center Station,Haikou,Hainan 571126)
出处
《热带农业工程》
2020年第6期58-65,共8页
Tropical Agricultural Engineering
