Extracting The Phytic Acid From The Plant-derived Wastes And Its Application

The plant-derived wastes come from the farming products processing. Just like the rice shells, the rice bran and so on. However, the application of the plant-derived wastes has not been developed well. So, reusing of the plant-derived wastes is a new research direction.Plant-derived wastes contains abundant phytic acid which is a good kind of biochemical reagents. Therefore, extracting the phytate from the plant-derived wastes is an effective way.In this paper, we try to extract the phytic acid from the plant-derived wastes, and study the application of the phytic acid.The main research content and results are shown as follows:(1) Extracting the phytic acid from the plant-derived wastes. Precipitation was used as the extraction method in this paper. Due to this way is simple. It is easy to getting the products,and suitable for using in the laboratory. The influence of preparation conditions on the extracting the phytic acid was investigated by single factor experiments and orthogonal experiments. The best reaction conditions were obtained: acid solution p H=2; soaking time=10h; T=60℃; the solid-liquid ratio(the plant-derived wastes to the acid solution mass ratio)=1:10.(2) Then the zirconium phytate was developed by reacting phytic acid with zirconium oxychloride via directly precipated method. And the zirconium phytate was characterized by the SEM, BET, XRD, and FT-IR. The experiment’s results show that the prepared zirconium phytate particles show morphology with porous surface.(3) Due to the zirconium phytate particles with porous surface has good performance of the adsorption of fluoride. Thus, the adsorption of fluoride ions by zirconium phytate samples was studied in this paper. To study the influence of the adsorption coditions as the p H of the fluoride ions solutions, the initial concentrations of the fluoride ions, and the adsorption time.The results of the experiments show that, the best adsorption performance of zirconium phytate to fluoride ions is the p H=6, and the maximum adsorption quantity reach is 0.955mg/g. The adsorption capacity of zirconium phytate has increased with the increase of theinitial concentrations of fluoride ions. The adsorption capacity of zirconium phytate also increases with the adsorption time. When the time was 300 min, the adsorption reach the equilibrium adsorption capacity. According to the study of adsorption kinetics, the adsorption kinetics of zirconium phytate to fluoride ions could be described by pseudo second-order kinetic model. The related coefficient of the linear R2=0.999 and the adsorption process is mainly chemisorption. The Freundlich equation better fitted the experimental data of the adsorption isotherm and the related coefficient of the linear R2=0.942.