工业水处理 ›› 2022, Vol. 42 ›› Issue (11): 153-161. doi: 10.19965/j.cnki.iwt.2022-0104

• 试验研究 • 上一篇    下一篇

铁、锆改性生物炭对水中磷的吸附特性及机理研究

刘艳芳1,2(), 高玮2,3, 尹思婕1,2, 刘晓帅1,2, 张妙雨1,2, 娄晓月4, 李再兴1,2()   

  1. 1. 河北科技大学环境科学与工程学院,河北 石家庄 050018
    2. 河北省污染防治生物技术实验室,河北 石家庄 050018
    3. 河北科技大学建筑工程学院,河北 石家庄 050018
    4. 天津市瑞德赛恩水业有限公司,天津 300270
  • 收稿日期:2022-08-10 出版日期:2022-11-20 发布日期:2022-11-23
  • 作者简介:

    刘艳芳(1984— ),副教授,博士。E-mail:

    李再兴,教授,博士。E-mail:

  • 基金资助:
    河北省自然基金面上项目(E2020208054); 石家庄市科学技术研究与发展计划项目(201240163A); 天津市科技计划项目(18ZXSZSF00170)

Adsorption characteristics and mechanism of phosphate in wastewater by iron-zirconium modified biochar

Yanfang LIU1,2(), Wei GAO2,3, Sijie YIN1,2, Xiaoshuai LIU1,2, Miaoyu ZHANG1,2, Xiaoyue LOU4, Zaixing LI1,2()   

  1. 1. School of Environmental Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China
    2. Pollution Prevention Biotechnology Laboratory of Hebei Province,Shijiazhuang 050018,China
    3. School of Civil Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China
    4. Tianjin Redsun Water Industry Co. ,Ltd. ,Tianjin 300270,China
  • Received:2022-08-10 Online:2022-11-20 Published:2022-11-23

摘要:

针对水体富营养化现象,以青霉素菌渣为原料制备生物炭,通过共沉淀法在所制备生物炭上负载铁、锆离子,得到了一种新型除磷吸附剂ZrFe-HBC,研究了其对水中磷酸盐的吸附特性及吸附机理。结果表明,ZrFe-HBC具备多层级孔隙结构,铁、锆离子以氧化物形式结合于生物炭之上。ZrFe-HBC吸附磷酸盐的过程符合准二级动力学和Freundlich模型,为多分子层的化学吸附,在25 ℃时饱和吸附量为18.26 mg/g。ZrFe-HBC对磷酸盐的吸附量随pH降低而增加,适合在酸性条件下对磷酸盐进行吸附处理。共存阴离子可与磷酸盐竞争吸附位点,其中CO3 2-对磷酸盐吸附产生严重干扰。选择1 mol/L NaOH溶液对吸附后的ZrFe-HBC进行解吸,经过5次吸附-脱附循环,ZrFe-HBC仍保持78%的吸附容量。综合吸附实验与表征结果分析ZrFe-HBC对磷酸盐的吸附机理,结果表明,ZrFe-HBC主要通过静电吸附、配体交换和表面沉淀作用对磷酸盐进行吸附。

关键词: 生物炭, 吸附, 改性, 磷酸盐, 抗生素菌渣

Abstract:

Aimed to control the eutrophication of water at present,a new phosphate removal adsorbent ZrFe-HBC was prepared by using Penicillin microbial residue as raw material to prepare biochar,then loading iron and zirconium ions on the prepared biochar by co-precipitation method. The characteristics and mechanism of phosphate adsorption in water were studied. The results showed that ZrFe-HBC had a multi-level pore structure,and iron and zirconium ions were bound to biochar in the form of oxides. The adsorption process of phosphate by ZrFe-HBC met pseudo-second-order kinetics and Freundlich model,so the adsorption process was chemical adsorption of multi-molecular layers. The adsorption capacity was 18.26 mg/g at 25 ℃. The adsorption capacity of ZrFe-HBC increased with the decrease of pH,which was suitable for phosphate adsorption under acidic conditions. The coexisting anions would compete with phosphate for adsorption sites,and CO3 2- would seriously interfere with phosphate adsorption. 1 mol/L NaOH solution was selected by experiment for desorption,and after five adsorption-desorption cycles,the adsorbent stilled maintain 78% adsorption capacity. The adsorption mechanism of phosphate on ZrFe-HBC was analyzed based on the adsorption experiment and characterization results. The results showed that ZrFe-HBC mainly adsorbed phosphate through electrostatic adsorption,ligand exchange and surface precipitation.

Key words: biochar, adsorption, modification, phosphate, antibiotic microbial residue

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