HCl浓度对水合氧化铁复合吸附剂P吸附效能的影响  

Effect of HCl concentration on P adsorption behavior of hydrated ferrous oxide composite adsorbents

作　　者：赵继旭 胡建龙 邵立南 郑曦 梁存珍[1] ZHAO Jixu;HU Jianlong;SHAO Li'nan;ZHENG Xi;LIANG Cunzhen(School of Mechanical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China;General Research Institute of Mining&Metallurgy,Beijing 100160,China)

机构地区：[1]北京石油化工学院机械工程学院,北京102617 [2]矿冶科技集团有限公司,北京100160

出　　处：《复合材料学报》2021年第4期1139-1146,共8页Acta Materiae Compositae Sinica

基　　金：北京市教委科技计划资助项目(KM202010017005);大学生创新训练项目(2020J00027)。

摘　　要：为避免传统水合氧化铁(HFO)负载树脂复合吸附剂制备过程中大量使用HCl对设备防腐、安全及环保带来的问题,优化HFO复合吸附剂的制备工艺方法,改变负载液中HCl浓度制备得到多种HFO复合吸附剂,考察制备得到的HFO复合吸附剂对P的吸附动力学、吸附等温线、初始pH、共存离子影响、解吸再生方法等,评价负载液中HCl浓度对吸附剂吸附效能的影响。结果表明,负载液中HCl浓度由2 mol·L^(-1)降低至0.5 mol·L^(-1),并不会显著降低HFO复合吸附剂的P吸附容量。HCl浓度为0.5 mol·L^(-1)时制备得到的HFO复合吸附剂对P的最大吸附容量为29.67 mg·g^(-1),显著高于D201树脂载体(16.39 mg·g^(-1)),其吸附动力学曲线更符合准一级吸附动力学模型,最佳的P吸附pH为6~8,在共存离子Cl^(-)、NO3^(-)、SO4^(2-)、CO3^(2-)浓度为1.0 g·L^(-1)的条件下,吸附剂对P的吸附容量降低31.1%~53.0%。采用5wt%的NaOH溶液能有效实现吸附剂中P的解吸再生。In order to reduce the amount of HCl used in the hydrated ferrous oxide(HFO)composite adsorbents preparation process,which frequently caused serious equipment corrosion,safe and environmental problems,several adsorbents were prepared with various HCl concentrations.The effectiveness of P adsorption by the adsorbents were investigated at various perspectives,including adsorption kinetics,adsorption isotherms,effect of pH,co-existing ions and desorption methods.Experimental results demonstrate that phosphate adsorption capacity of HFO composite adsorbents doesn’t decrease significantly with the decreasing HCl concentration(from2 mol·L^(-1)to 0.5 mol·L^(-1)).The maximum P adsorption capacity of HFO composite adsorbent prepared at0.5 mol·L^(-1)HCl is 29.67 mg·g^(-1),which is higher than the corresponding value of D201 resin(16.39 mg·g^(-1)).The adsorption kinetic curves of the adsorbents are fitted well with the pseudo first order adsorption kinetic equation.The optimal pH for P removal is 6-8.When the concentration of coexisting ions,such as Cl^(-),NO3^(-),SO4^(2-),CO3^(2-),in P solution is 1.0 g·L^(-1)respectively,the phosphate adsorption of HFO composite adsorbents decreases by 31.1%-53.0%.The adsorbed P on HFO composite adsorbents could be well desorbed with 5 wt%NaOH solution.

关 键 词：吸附剂 水合氧化铁(HFO) P HCL 树脂 

分 类 号：X703[环境科学与工程—环境工程]