炭化秸秆吸磷剂的制备及吸附性能研究

以水稻秸秆为原料,经炭化、KMnO4预氧化和FeSO4溶液改性后,制备得到低成本的改性炭化水稻秸秆（modified carbonized rice straw,MCRS）.采用Zeta电位分析仪、扫描电镜、能谱仪、比表面积分析仪、红外光谱分析仪和X射线衍射分析仪多种手段,分析了炭化水稻秸秆和MCRS的理化性能.通过静态吸附试验研究了吸附剂投加量、pH值和温度对MCRS除磷效果的影响.结果表明：MCRS对磷的吸附是一个吸热过程,其吸附等温线可用Langmuir方程进行拟合.当投加量为4g·L^-1、pH值为7时,MCRS对水溶液中磷的去除率最高可达96％;依据Langmuir方程计算得到,30℃条件下,MCRS对磷的最大吸附量为5.49 mg·g^-1.

Preparation and Adsorptive Properties of Carbonized Rice Straw Based Phosphate Sorbent.

Through carbonization,pre-oxidization with KMnO4 and modification with FeSO4,rice straw was prepared into low-cost modified carbonized rice straw （MCRS）.Physical and chemical properties of the carbonized rice straw and MCRS were analyzed with Zeta potential analyzer,scanning electron microscope （SEM）,alpha ray spectrometer （ARS）,specific surface area analyzer （BET）,Fourier transform infrared spectrum analyzer （FTIR） and X-ray diffraction analyzer （XRD）.Meanwhile static adsorption tests were carried out to explore effects of dosage of the adsorbent,pH and temperature on phosphate adsorption efficiency of the adsorbent.It was found that phosphate adsorption on MCRS was an endothermic process,and its adsorption isotherm fitted well with the Langmuir equation.In the solution,7 in pH,4 g · L-1 of MCRS was added,the phosphate removal rate could reach as high as 96%,and at 30 ℃,it could adsorb as much as 5.49 mg · g^-1 phosphorus,according to the Langmuir equation.