火焰原子光谱法分析有机功能试剂改性纳米SiO_2对水中Cr_2O_7^(2-)的吸附行为

Analysis the Properties of Cr_2O_7^(2-) Adsorption onto Functional Organic Reagent Modified Nano-SiO_2 by Flame Atomic Absorption Spectroscopy

以纳米二氧化硅(Nano-SiO2)为原料,硅烷偶联剂(KH-550)作为交联剂首先合成了氨丙基纳米二氧化硅(Nano-APSG),然后加入有机功能试剂季磷盐(COOH-Ph-CH2-P(C6H5)3Br)通过有机合成反应合成有机功能试剂改性纳米二氧化硅材料(Si|(CH2)3-NH-CO-Ph-CH2-P(C6H5)3Br),利用红外、粒径、热重分析等对结构进行了表征。通过火焰原子吸收光谱法研究此有机功能试剂改性纳米二氧化硅材料对水中Cr2O27-离子的吸附行为,考察了吸附的最佳pH、震荡时间、吸附剂用量等因素的影响,实验结果表明,在pH 1,吸附剂用量为0.1g,震荡时间为30min时吸附剂对Cr2O27-离子的吸附效率可达95%以上,实验结果表明这种新型的功能材料可实现对废水中Cr2O72-离子的分离与处理。

A new type of functional organic reagent modified nano-SiO2 sorbent（Si｜（CH2）3-NH-CO-Ph-CH2-P（C6H5）3Br） was synthesized by several reasonable organic combination reactions using nano-SiO2,γ-Aminopropyl triethoxysilane（KH-550） and functional organic reagent（COOH-Ph-CH2-P（C6H5）3Br） as raw materials.The prepared new sorbent was characterized by using FTIR,particle diameter and TG.A batch of adsorption experiments was performed to evaluate its adsorption behavior of Cr2O2-7 by flame atomic absorption spectroscopy（FAAS）.The effects of solution pH,shaken time and sorbent amount on the extraction of Cr2O2-7 from aqueous solutions were studied.Results showed that when under the optimum conditions the solution pH 1,sorbent amount=0.1 g,and shaken time=30 min,the adsorption efficiency can be more than 95%.It indicated that this novel sorbent（Si｜（CH2）3-NH-CO-Ph-CH2-P（C6H5）3Br） was a solid sorbent being efficient and low-cost,with convenient separation,and can remove trace Cr2O2-7 in environmental waste water.