ABSTRACT

The coprecipitation method was used to produce magnetic cotton straw biochar (MCS). Elemental analysis, FTIR, XRD, SEM, BET and magnetization curves were used to characterize MCS and CS. The results show that the MCS had excellent magnetic separation properties. When the pH value was higher than 5, the pH of the aniline solution had little effect on the adsorption capacity of MCS and CS. However, with increasing temperature, the adsorption capacity increased significantly. The maximum adsorption capacities of MCS and CS for aniline were 38.67 mg/g and 42.57 mg/g, respectively. The adsorption process of aniline was spontaneous, endothermic, and involved monolayer sorption and chemical adsorption. The adsorption capacity was due to the presence in magnetic biochar of phenolic hydroxyls and H-bond donors that adsorbed aniline. Therefore, the application of MCS presents good prospects for the removal of toxic and refractory aniline from water.

摘要

共沉淀法用于生产磁性棉秸秆生物炭（MCS）。使用元素分析，FTIR，XRD，SEM，BET和磁化曲线来表征MCS和CS。结果表明，MCS具有优异的磁分离性能。当pH值大于5时，苯胺溶液的pH值对MCS和CS的吸附能力影响很小。但是，随着温度的升高，吸附容量显着增加。MCS和CS对苯胺的最大吸附容量分别为38.67 mg / g和42.57 mg / g。苯胺的吸附过程是自发的，吸热的，并且涉及单层吸附和化学吸附。吸附能力是由于在磁性生物炭中存在酚羟基和吸附苯胺的H键供体。所以，