In this article, starch phosphate-g-poly (methacrylic acids) (SP-g-PMAAs) were synthesized by dual modification. Firstly starch phosphate (SP) was synthesized by phosphorylation of native starch (NS) with mono sodium-phosphate and di sodium-phosphate. Afterwards, methacrylic acid (MAA) was grafted onto SP via free radical polymerization to synthesize SP-g-PMAAs. The structure of the SP and SP-g-PMAAs was investigated by phosphorus nuclear magnetic resonance, proton nuclear magnetic resonance and fourier-transform infrared spectroscopy. The X-ray diffraction studies showed that the modification diminished the crystalline nature of SP and SP-g-PMAAs. The SEM images showed spherical or polyhedral smooth surface for the starch. After modification, SP and SP-g-PMAAs exhibited distorted and rougher surfaces which are assumed to be good for adsorption. The dual modification produced phosphate and carboxylic groups on the starch backbone. The phosphate and carboxylic groups have high tendency to make hydrogen bonding with phenol. The comparative adsorption studies of NS, SP and SP-g-PMAAs were checked for phenol. The experimental results showed adsorption efficiencies of 0.022 g/g, 0.082 g/g, 0.100 g/g, 0.148 g/g and 0.151 g/g for NS, SP, SP-g-PMAA1, SP-g-PMAA2 and SP-g-PMAA3, respectively. The following findings revealed that dual modification enhanced the adsorption ability of NS.

本文通过双重修饰合成了磷酸淀粉-g-聚（甲基丙烯酸）（SP- g- PMAAs）。首先用磷酸一钠和磷酸二钠对天然淀粉（NS）进行磷酸化合成淀粉磷酸酯（SP）。然后，通过自由基聚合将甲基丙烯酸（MAA）接枝到SP上以合成SP- g- PMAA。通过磷核磁共振，质子核磁共振和傅里叶变换红外光谱研究了SP和SP- g -PMAA的结构。X射线衍射研究表明，这种修饰降低了SP和SP- g的晶体性质-PMAA。SEM图像显示淀粉的球形或多面体光滑表面。改性后，SP和SP- g -PMAAs表现出扭曲和粗糙的表面，被认为对吸附有好处。双重修饰在淀粉主链上产生磷酸根和羧基。磷酸基和羧基具有与苯酚氢键的高趋势。检查了NS，SP和SP-g-PMAAs的对比吸附研究中的苯酚。实验结果表明，NS，SP，SP- g- PMAA1，SP- g- PMAA2和SP-的吸附效率分别为0.022 g / g，0.082 g / g，0.100 g / g，0.148 g / g和0.151 g / g。G-PMAA3。以下发现表明双重修饰增强了NS的吸附能力。