亚麻粕生物炭对苯酚的吸附特性研究

Study on Phenol Adsorption Characteristics of Flax Meal Biochar

为促进亚麻粕的资源化利用,以亚麻粕为材料,采用慢速热解技术于300、400、500℃条件下制备生物炭吸附剂(BC300、BC400、BC500),检测其去除水中苯酚的效果。结果表明,生物炭的制备温度显著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。此外,苯酚的初始浓度、吸附温度和时间等因素均能影响吸附效果。25℃下苯酚初始浓度为20 mg/L时,BC500对苯酚的去除率最高,达98%,生物炭对苯酚的等温吸附线符合Langmuir模式和Freundlich模式。研究结果探明了亚麻粕制备生物炭吸附剂去除苯酚的最适条件,可为亚麻粕应用于苯酚等有机污染物的去除提供理论依据。

The flax meal was used as raw material to prepare the biochar adsorbent at 300 ℃ ,400 ℃ and 500℃ ,which were named BC300,BC400 and BCS00. Phenol was subject to batch adsorption in aqueous medium by the prepared flax meal biochar. The results of adsorption experiments show that the preparation temperature of biochar significantly affects its adsoqotion effect on phenol. The adsorption capacity of phenol from thine kinds of biochar was BCS00 〉 BC400 〉 BC300. In addition,the initial concentration of phenol in waste water, the temperature and time of adsorption can also affect the adsorption effect. When the initial concentration of phenol was 20 mg/L and the adsorption temperature was 25 ℃, the removal rate of phenol was up to 98% after BC500 adsorption. The isothermal adsorption line for phenol conforms to the Langmuir mode and the Freundlich mode. The results showed the best condition of phenol removal from aquous solution by flax meal biochar, thus providing a theoretical basis for the removal of organic pollutants such as phenol.