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为使浒苔得到资源化利用,本研究采用慢速热解技术于不同温度下制备浒苔生物炭,并对其理化性质进行表征.结果表明,400℃时,浒苔裂解已达较高程度.浒苔生物炭产率及灰分含量与热解温度呈负相关,碳含量与热解温度呈正相关,其表面呈蜂窝状多孔结构,比表面积为44.54~317.82 m~2·g~(-1),表面含有丰富的羟基(—OH)和羧基(—COOH)等含氧官能团.吸附实验显示,浒苔生物炭对Cr(Ⅵ)的吸附符合准二级动力学方程和Langmuir等温吸附模型.表明浒苔生物炭对Cr(Ⅵ)的吸附为单分子层化学吸附,主要受快速反应过程控制.浒苔生物炭吸附Cr(Ⅵ)的最适p H为2,吸附容量表现为BC400>BC700>BC600>BC500>BC300,其中BC400的吸附量为4.79 mg·g~(-1).浒苔生物炭对Cr(Ⅵ)的吸附机制主要包括生物炭与HCr O-4和Cr2O_2-7等阴离子之间的静电作用,以及生物炭表面—OH和—COOH等含氧官能团的络合作用.
In order to obtain the utilization of Enteromorpha, the study uses slow pyrolysis technology at different temperatures to prepare enteromorpha biochar, and its physical and chemical properties were characterized.The results show that at 400 ℃, Enteromorpha lysis has reached a high degree The yield and ash content of Enteromorpha baei had a negative correlation with the pyrolysis temperature, the carbon content was positively correlated with the pyrolysis temperature, and the surface was honeycomb porous with the specific surface area of 44.54-317.82 m 2 · g -1 ), The surface is rich in hydroxyl (-OH) and carboxyl groups (-COOH) and other oxygen-containing functional groups.Adsorption experiments show that Enteromorpha bioflocculant Cr (¢ ö) adsorption is in accordance with quasi-second order kinetic equation and Langmuir Isothermal adsorption model. The results showed that adsorption of Cr (Ⅵ) by biochar of Enteromorpha prolifera was single-molecule chemisorption, which was mainly controlled by rapid reaction process.The optimal pH of Cr (Ⅵ) adsorbed by Enteromorpha biochar was 2 and its adsorption capacity was BC400> BC700 > BC600> BC500> BC300, in which the adsorption capacity of BC400 was 4.79 mg · g -1 .The adsorption mechanism of Cr (Ⅵ) by biochar of Enteromorpha prolifera mainly included anions such as biochar and HCr O-4 and Cr2O_2-7 The electrostatic interaction between, and biochar surface -OH and-COOH and other oxygen-containing functional groups complexation.