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采用活性氧化铝、零价铁粉和载铁沸石作为吸附剂,通过静态吸附实验,研究3种饮用水除砷材料的吸附特性及影响因素。结果表明,在pH值为6.5,砷浓度为1 mg/L,投加量为2 g/L,25℃恒温的条件下,活性氧化铝、零价铁粉和载铁沸石分别在90 min、150 min和90 min达到吸附平衡状态,均较好符合langmuir等温吸附模型,对砷的最大吸附容量依次为7.3、3.3和3.9 mg/g。pH值和竞争性阴离子对砷的去除均有显著影响。降低溶液pH值能明显提高3种材料的除砷效率;水中磷酸根离子的存在,能够明显降低活性氧化铝和零价铁粉的除砷效率;水中硅酸根离子的存在,能够明显降低零价铁粉和载铁沸石的除砷效率。
Activated alumina, zero-valent iron powder and zeolite as adsorbent were used to study the adsorption characteristics and influencing factors of three arsenic removal materials by static adsorption experiments. The results showed that activated alumina, Fe-Fe powder and Fe-loaded zeolite were treated at 90 min at pH 6.5, arsenic concentration 1 mg / L, dosage of 2 g / L and constant temperature of 25 ℃, 150 min and 90 min, respectively. All of them are in good agreement with the Langmuir isothermal adsorption model, and the maximum arsenic adsorption capacities were 7.3, 3.3 and 3.9 mg / g, respectively. Both pH and competitive anions have a significant effect on arsenic removal. Decreasing the pH value of the solution can significantly improve the arsenic removal efficiency of the three materials. The presence of phosphate ions in water can significantly reduce the arsenic removal efficiency of activated alumina and zero-valent iron powder. The presence of silicate ions in water can significantly reduce the zero- Arsenic removal efficiency of iron and iron zeolite.