Preparation Of Novel Adsorption Materials And Their Research On Adsorption Property For Trace Metal Ions

In today’s society, environmental issues, food and drugs safety have become a serious problem, which affected the quality of people’s life badly and how to detect and supervise the environment and food have become a major responsibility of each analytical chemistry workers. In those harmful substances, metal ions pollution can’t be ignored because metal ions possess many species, valence states and are easy to change, which increased the difficulty of the detection work. Solid phase extraction (SPE) has become the major method to the separation and preconcentration of metal ions because of its advantage of simple operation, high selectivity and good reproducibility detection of metal ions among so many other methords. The traditional solid phase adsorption materials is present problems in efficiency and the choice of specific, but the modified materials which introduced O, S, N, P and other elements, enhanced the efficiency of separation and preconcentration greatly and with satisfactory achievements in scientific research on metal ions. This paper shows that modified activated carbon or diatomite so as to form novel solid-phase extraction materials and do some research on trace metal ions’separation and preconcentration.1Calcium reagent (Eriochrome Blue Black R) loaded and modified activated carbon to produce a new SPE sorbent material and apply to the separation and enrichment of trace Cr(Ⅲ) and Pb (Ⅱ) in environmental samples.Through static and dynamic adsorption experiments to examine the optimization of experimental conditions of the optimum preconcentration acidity, oscillation time, adsorption capacity, elution conditions, the detection limit and precision as well as the analysis of real samples and the satisfactory result was obtained.2The synthesis of a new type of solid phase extraction adsorbent by using furfural modified diatomite, which was used to measure trace Cu (Ⅱ) in environmental samples and was detected by inductively coupled plasma atomic emission spectrometry (ICP-AES). The results show that, at pH4, this adsorption material can achieve quantitative adsorption of Cu (Ⅱ) and its adsorption capacity is25.13mg g"1, the detection limit is0.19ng mL-1, enrichment factor is150.3Multi-walled carbon nanotubes were loaded by copper reagent (BZO) to adsorb and analysis trace Cr (Ⅲ), Cu (Ⅱ), Fe (Ⅲ) and Pb (Ⅱ) in liquid samples. The experimental results show that this method can analysis trace Cr (Ⅲ), Cu (Ⅱ), Fe (Ⅲ) and Pb (Ⅱ) and the detection limit was0.65,0.77,0.40and0.45ng mL-1, respectively, the relative standard deviation is less than3.5%(n=8), the results were satisfactively.