摘要
本文利用绿茶提取液绿色合成纳米氧化铁(G-FeNPs),主要探讨不同合成pH和温度条件下获得的G-FeNPs对水中重金属和染料的吸附效率,以此来表征材料的性能差异。结果表明,合成过程中pH对材料性能的影响要显著高于温度的影响。随着pH升高,G-FeNPs对重金属的去吸附率增加,在pH7条件下制备的G-FeNPs对20mg/L的Cd(Ⅱ)、Cr(Ⅵ)、Pb(Ⅱ)的吸附效率高达到75.30%、87.18%、98.88%。然而,G-FeNPs对于染料(50mg/L)的吸附则不同,对孔雀石绿和酸性品红的吸附率趋势随pH的升高而增加,吸附率达到76.93%、54.19%;而对直接耐晒黑G的吸附率随pH的升高而下降,在pH4吸附率达到68.64%。FTIR显示pH对G-FeNPs材料有机官能团组成的影响大于温度;XRD结果显示G-FeNPs颗粒中含有多种形态氧化铁。本研究的结果揭示了pH和温度在绿色合成中对产品性能具有重要的影响,针对不同的污染物类型,应该选择不同的合成条件。
The preparation of iron oxide nanoparticles by green tea extract(G-FeNPs) was used to remove heavy metals and dyes in wastewater,and the effect of synthesis conditions(pH and temperature) on G-FeNPs capacity were investigated. The results showed that the effect of pH on the material properties is significantly higher than that of temperature during the synthesis. With the increase of pH, the adsorption rate of G-FeNPs for heavy metals increased, and the adsorption efficien cies of G-FeNPs prepared at pH 7 for 20 mg/L Cd, Cr, and Pb reached 75.30%, 87.18%, and 98.88%, respectively. However, the adsorption of G-FeNPs for dyes(50 mg/L) was different. The adsorption rates of malachite green and acid fuchsin increased with the increase of pH, and the adsorption rates reached 76.93% and 54.19%. The adsorption rate of direct black G decreased with the increase of pH, and the adsorption rate reached 68.64% at pH4. FTIR showed that pH had a greater effect on the composition of organic functional groups in G-FeNPs than temperature. XRD results showed that G-FeNPs particles contained various forms of iron oxide. This study revealed that pH and temperature have important effects on product capacity in green synthesis, and different synthesis conditions should be selected for different pollutant types.
作者
吴炜钦
蒋明琴
金晓英
林加奖
陈祖亮
Wu Weiqin;Jiang Mingqin;Jin Xiaoying;Lin Jiajiang;Chen Zuliang(College of Environmental Science and Engineering,Fujian Normal University,Fujian,350007;Fujian Province Product Quality Inspection Research Institute,Fujian,350002)
出处
《当代化工研究》
2022年第23期32-34,共3页
Modern Chemical Research
基金
2019年福建省科学技术厅福建省自然科学基金“外源碳/铁输入对土壤铁循环的增强效应及镉形态转化影响的机制研究”(项目编号:2019J01287)。
关键词
PH
温度
绿色合成
纳米氧化铁
吸附性能
pH
temperature
green synthesis
iron oxide nanoparticles
adsorption capacity
