沙棘籽生物炭对苯酚的吸附特性研究

Adsorption characteristics of seabuckthorn seed biochar on phenol

为促进沙棘籽的资源化利用,以沙棘籽为原材料,采用慢速热解技术分别于300、400、500℃条件下制备生物炭吸附剂(BC300、BC400、BC500),研究其去除水中苯酚的效果。吸附实验结果表明,生物炭的制备温度明显影响其对苯酚的吸附效果,3种温度制备的生物炭对苯酚的吸附能力表现为BC500>BC400>BC300。苯酚的初始浓度、吸附温度、时间等因素均影响吸附效果。45℃下苯酚初始浓度为20mg/L时,BC500对苯酚的去除率最高,达92.1%,生物炭对苯酚的等温吸附线符合Langmuir模式和Freundlich模式。探明了沙棘籽制备生物炭吸附剂及其去除苯酚的最适条件,可为沙棘籽应用于苯酚等有机污染物的去除提供理论依据。

Seabuckthorn seed was used as raw material to prepare biochar adsorbent at 300,400 and 500℃,which were named BC300,BC400 and BC500,whose effect on removing phenol was detected.The results of adsorption experiments showed that the preparation temperature of biochar significantly affects its adsorption effect on phenol.The adsorption capacity of three kinds of biochar was BC500>BC400>BC300.In addition,the initial concentration of phenol,the temperature and time of adsorption can also affect the adsorption result.When the initial concentration of phenol was 20 mg/L and the adsorption temperature was 45℃,the removal rate of phenol was up to 92.1%by BC500.The sorption isotherm of phenol in biochar conform to Langmuir mode and Freundlich mode.The results showed the method of preparing biochar adsorbent and the optimum condition of phenol removal from aquous solution by seabuckthorn seed dregs,thus providing a theoretical basis for removal of organic pollutants such as phenol.