不同铁氧化物对磷酸盐模拟废水的吸附实验研究  

Experimental Study on Adsorption of Phosphate Simulated Wastewater by Different Iron Oxides

作　　者：张长华 Zhang Changhua(Ganzhou Gerui Engineering Consulting Co.,Ltd.,Ganzhou 341000,China)

机构地区：[1]赣州格瑞工程咨询有限公司,江西赣州341000

出　　处：《广东化工》2024年第19期66-68,共3页Guangdong Chemical Industry

摘　　要：磷是植物生长所必需的营养元素之一,但水中过量的磷酸盐容易造成水体的富营养化,影响水生态平衡。另一方面,铁是地壳中丰度较大的金属元素之一,主要以铁氧化物的形态存在于环境中。铁氧化物在自然界中常见的纳米立方体(HNCs)和纳米晶体(HNPs)两种类型。不同类型的铁氧化物其原子排列结构不同,其界面特性不一样,从而导致该界面对水中磷酸盐的吸附机制不同。本文以含磷酸盐模拟废水为研究对象,探讨合成不同铁氧化物(HNCs和HNPs)对磷酸盐模拟废水的吸附特性。结果表明:在反应的前15分钟,两种铁氧化物对模拟磷酸盐废水的吸附速率都非常快速,反应30分钟时基本达到吸附平衡,HNCs和HNPs对模拟废水中磷酸盐的吸附过程受物理吸附和化学吸附共同控制。随着磷酸盐初始浓度的增加,两种铁氧化物HNCs和HNPs对磷酸盐去除率持续升高。随着反应温度的升高,HNCs和HNPs对废水中磷酸盐的去除率也提高,表明铁氧化物对磷酸盐的吸附过程是吸热反应;相同条件下HNCs比HNPs对模拟废水中磷酸盐的吸附效果更好。随着共存盐离子浓度的增加,磷酸盐去除率持续升高;共存盐离子对HNCs吸附废水中磷酸盐的促进作用稍差于HNPs,说明HNCs和HNPs对磷酸盐的吸附作用主要是表面络合和静电作用。Phosphorus is one of the necessary nutrients for plant growth,but excessive phosphate in water is easy to cause eutrophication and affect the water ecological balance.Iron,on the other hand,is one of the most abundant metallic elements in the Earth's crust and exists in the environment mainly in the form of iron oxides.Iron oxides are commonly found in nature in two types:nanocubs(HNCs)and nanocrystals(HNPs).Different types of iron oxides have different atomic arrangement structure and different interface characteristics,which leads to different adsorption mechanisms of phosphate in water.In this paper,the adsorption properties of synthetic iron oxides(HNCs and HNPs)on phosphate simulated wastewater were studied.The results show that in the first 15 minutes of the reaction,the adsorption rates of the two iron oxides on the simulated phosphate wastewater are very fast,and the adsorption equilibrium is basically reached at 30 minutes of the reaction.The adsorption process of HNCs and HNPs on the phosphate in the simulated wastewater is controlled by physical adsorption and chemical adsorption.With the increase of the initial concentration of phosphate,the removal rate of phosphate by two iron oxides,HNCs and HNPs,increased continuously.With the increase of reaction temperature,the removal rate of phosphate from wastewater by HNCs and HNPs also increased,indicating that the adsorption process of phosphate by iron oxides was endothermic.Under the same conditions,HNCs has better adsorption effect on phosphate in simulated wastewater than HNPs.With the increase of coexisting salt ion concentration,the phosphate removal rate continued to increase.The effect of coexisting salt ions on phosphate adsorption by HNCs is slightly worse than that by HNPs,indicating that the adsorption of phosphate by HNCs and HNPs is mainly surface complexation and electrostatic interaction.

关 键 词：铁氧化物 磷酸盐 吸附 共存盐离子 

分 类 号：TQ[化学工程]