Evaluation of the adsorption potential of Fe3O4 immobilized waste rock wool for the removal of Pb(II) from the aquatic environment

文献类型： 外文期刊

第一作者： Zhao, Da

作者： Zhao, Da;Sun, Ping;Liu, Dazhi;Liang, Chunhao;Zang, Chaoqun;Long, Haibo

作者机构：

关键词： Waste rock wool; Fe3O4; Pb(II); Adsorption

期刊名称：DESALINATION AND WATER TREATMENT （ 影响因子：1.254； 五年影响因子：1.553 ）

ISSN： 1944-3994

年卷期： 2021 年 221 卷

页码：

收录情况： SCI

摘要： Rock wool (RW) is an inorganic fiber material with chemical stability and fire retardancy also available in low cost. RW is widely used in building exterior wall insulation and interior sound insulation and accounts for an increasing proportion of demolition waste from buildings. Iron oxide can efficiently remove pollutants from aqueous solution. In our research, Fe3O4 nanoparticles were deposited on acid-modified waste rock wool (ARW) with the coprecipitation method, and a novel adsorbent for lead was generated. Sorbent materials were characterized by scanning electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy and X-ray diffraction, and adsorption parameters under different reaction conditions (pH, concentration, contact time, and sorbent dosage) were investigated. The results indicate that the new adsorbent adsorbs lead more efficiently than Fe3O4 alone, because the incorporation of rock wool reduces the agglomeration effect. The adsorption of lead into Fe3O4 deposited acid-modified waste rock wool fiber (ARWF) obeys pseudo-second-order kinetics and Langmuir models. Batch adsorption experiments show that the ARWF can efficiently remove lead from water with a maximum adsorption capacity of 123.15 mg/g and can adsorb 99.45% of lead in 30 min when pH is 4-8. ARWF was also demonstrated to have good potential for regeneration and reuse after four consecutive cycles. These results suggest that waste rock wool loaded with Fe3O4 nanoparticles is a promising material for water treatment.

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