摘要
为缓解过量磷对水体的富营养化影响,本研究以聚丙烯腈纤维为原料,通过胺化、配位反应,成功制备出一种新型磷酸盐吸附剂(PANAF-Cu),对水体中过量的磷进行回收再利用,同时实现对磷的高资源化利用.扫描电镜(SEM)、元素分析(EA)、X射线衍射(XRD)、傅里叶红外光谱(FT-IR)结果表明,胺基成功接枝,Cu2+在纤维上固载,并通过Cu-N键与纤维骨架结合.吸附性能实验表明,PANAF-Cu具广泛的pH适应性,其中pH在5-8范围吸附能力较高.通过对实验数据进行模型拟合,发现PANAF-Cu对磷酸盐的吸附过程更接近于化学吸附,且PANAF-Cu对磷酸盐的吸附更趋向于均匀的单分子层吸附,其对磷的最大理论吸附量为49.03 mg·g-1.PANAF-Cu最优异的循环能力,8次吸-脱附循环后,去除率仍可达到90％以上.在连续流动实验中发现,当出水量小于2700 mL时,PANAF-Cu对磷酸盐去除率可维持在99％以上,PANAF-Cu在水体磷酸盐的去除和回收领域拥有良好的应用前景.
Abstract
To alleviate the influence of phosphorus on water eutrophication,It is successfully prepared a new phosphate adsorbent(PANAF-Cu)using polyacrylonitrile fiber as raw material through amination and coordination reaction.It can be recovered and reused excess phosphorus in water and realized high resource utilization of phosphorus.The results of scanning electron microscopy(SEM),elemental analysis(EA),X-ray diffraction(XRD)and Fourier infrared spectroscopy(FT-IR)were showed that the amine group was successfully grafted on the fiber,and Cu2+supported on the fiber skeleton by Cu-N bond.The adsorption performance experiments is showed that the PANAF-Cu had a wide range of pH adaptability.The adsorption capacity was higher in the range of pH 5-8.It can be found that the adsorption process of phosphate by PANAF-Cu was closer to chemical adsorption through model fitting of the experimental data.The adsorption of phosphate by PANAF-Cu was more homogeneous monolayer adsorption.The maximum theoretical adsorption capacity of phosphorus was 49.02 mg·g-1.The PANAF-Cu was had the best circulation ability.The removal rate can still reach to more than 90％after eight times sorption-desorption cycles.It was found that when the water yield was less than 2700 mL in the continuous flow experiment.The phosphate removal rate of the PANAF-Cu could be maintained above 99％.The PANAF-Cu will have a good application prospect in the field of phosphate removal and recovery in water bodies.
基金项目
国家自然科学基金(22208003)
安徽省研究生创新创业实践项目(2022cxcysj061)
安徽省研究生创新创业实践项目(2022cxcysj059)
安徽省科技重大专项(202103a06020012)
安徽超越环保科技股份有限公司技术中心开放基金(2022-KYJJ-3)
NETL
NSTL
万方数据