巨藻生物炭的制备及其去除水体中菲的应用

Preparation of macroalgae biochar and its application in removal of phenanthrene from aqueous solution

为了研究去除水溶液中菲(Phe),选择4种大型海藻麒麟菜、龙须菜、海带、浒苔在不同温度(300、500和700℃)下制备生物炭,并对其进行结构表征,包括元素分析、比表面积测试法(BET)、热重仪(TG)、扫描电子显微镜(SEM)和傅里叶变换红外光谱(FTIR)分析,以比较4种巨藻生物炭之间的差异.结果表明,麒麟菜生物炭(EBC500)具有最高的比表面积(271.51 m^(2)·g^(-1)),对Phe的去除率为96.36%.动力学模型拟合表明,EBC500的吸附由化学和物理吸附以及颗粒内扩散共同决定.使用Langmuir和Freundlich方程对EBC500进行拟合,拟合的R2值大于0.93.EBC500同时表现出单层和多层的吸附作用,并且其再生实验表明,Phe去除率高于98%.

To investigate the removal of phenanthrene(Phe)from aqueous solutions,four macroalgae(Enteromorpha prolifera,Eucheuma,Gracilariopsis lemaneiformis,Laminaria japonica)were selected to prepare biochar at different temperatures(300,500 and 700℃).Structural characterization,including elemental analysis,Brunauer-Emmett-Teller(BET),Thermogravimetry(TG),Scanning Electron Microscopy(SEM),and Fourier Transform Infrared Spectroscopy(FTIR)analyses,were carried out to compare the differences among the four biochars.Eucheuma biochar(EBC500)had the highest specific surface area(271.51m^(2)·g^(-1))and the highest Phe removal rate(96.36%).Kinetic model fitting showed that the adsorption of EBC500 was determined by a combination of chemical and physical adsorption and intraparticle diffusion.EBC500 was fitted,using the Langmuir and Freundlich equations.The fitted R2 values were greater than 0.93.EBC500 exhibited both monolayer and multilayer adsorptions.Regeneration experiments showed that the removal rate of Phe was higher than 98%.