负载稀土生物炭对水体磷酸盐的吸附效应

Adsorption Effect of Cerium-Based Hydrothermal Cellulose Microspheres on Phosphate in Water

通过共沉淀方法制备稀土镧基生物炭(La-BC),并对LA-BC对水体磷酸盐的吸附性能及吸附机制进行研究。结果表明,XRF证明了镧元素成功负载到La-BC上,LA-BC对磷酸盐吸附4 h达到平衡。Langmuir等温线及准二级方程对磷酸盐的吸附过程拟合性更好。负载镧玉米生物炭(La-CBC)、负载柳树生物炭(La-WBC)的饱和吸附量Qm分别为15.86和13.31 mg∙g−1。pH对吸附过程影响显著,高pH导致La-BC对磷的去除效能下降。实验结果证明了La-BC可以有效的去除水体磷酸盐,本研究为废水中磷酸盐的去除提供一定的理论和技术参考。

In the study, La-doped biochars (La-BC) were prepared by the coprecipitation method and the phosphate adsorption on La-BC in water was investigated. The experimental results showed that La-BC had a good removal effect on phosphate in water. XRF results indicated that lanthanum was successfully loaded on the surface of La-BC. Batched experiments showed that phosphate adsorption on La-BC met the pseudo-second-order kinetics model. The Langmuir isotherm adsorption model could better describe the isothermal adsorption process of La-BC towards phosphate. The equilibrium adsorption capacity of La-CBC and La-WBC was 15.86 mg∙g−1 and 13.31 mg∙g−1, respectively. The lower pH contributed to the adsorption of phosphate on La-BC. The study suggested that La-BC was a suitable adsorbent to remove phosphate from water.