腐殖酸改性小龙虾壳生物炭对水中亚甲基蓝的吸附去除

Adsorptive removal of methylene blue by humic acid modified crawfish shell biochar

腐殖酸(HA)是天然水体中大量存在的有机物之一,其在特殊情况下能增强材料的使用性能。基于此,用HA将小龙虾壳生物炭(CS)进行了改性,制备了HA改性生物炭(HCSs),并将其用于水中亚甲基蓝(MB)的吸附。结果表明,改性后的HCSs对MB的吸附量(370.6 mg/g)>CS(252.0 mg/g),这说明水中HA的存在可促进CS对MB的吸附去除,与此同时水中HA也得到了去除(>30%)。进一步分析表明,MB在CS上的吸附以非均相化学吸附为主,HA的加入可有效提高生物炭表面的羟基官能团含量,从而提高了CS的化学吸附能力。

Humic acid(HA)is one of the most abundant organic substances in natural water.In the practical application of materials.However,the exist of HA can also enhance the performance of materials in some special cases.Based on this,in this paper,HA modified biochar(HCSs)was prepared by crayfish shell biochar(CS)which was modified by HA,and applied to adsorb methylene blue(MB)in water.The results showed that the adsorption capacity of modified HCSs for MB(370.6 mg/g)was higher than that of CS(252.0 mg/g),which indicated that the presence of HA in water could promote the adsorption and removal of MB by CS,and HA in water was also removed(>30%).Further analysis shows that the adsorption of MB on CS is mainly heterogeneous chemical adsorption,and the addition of HA can effectively improve the content of hydroxyl functional groups on the surface of biochar,thus improving the chemical adsorption capacity of CS.