磁性污泥生物炭的制备及对水溶液中As(Ⅲ)的吸附性能研究

Preparation of Magnetic Sludge Biochar and Study on Its Adsorption Performance for As(III) in Aqueous Solutions

摘要: 以宿州市宿马园区污水处理厂含铁市政污泥为原料制备磁性污泥生物炭(MSB)，用于水中三价砷(As(III))的吸附去除。应用扫描电子显微镜(SEM)，磁性表征(VSM)和X射线衍射光谱(XRD)等技术探究MSB的物理化学性质；研究了不同炭化温度，吸附剂投加量，溶液pH，共存离子，反应温度等因素对MSB吸附As(III)的影响。结果表明900℃条件下制备的泥生物炭(MSB900)，其中铁以α-Fe⁰为主，有强磁性。在最佳反应条件下(炭化温度900℃，投加量为0.8 g/L，pH = 3， 或 共存，反应温度35℃)，MSB900对As(III)的最大吸附率为98.3%。以含铁市政污泥为原料制备的磁性污泥生物炭可以作为一种有效且低成本的As(III)吸附材料。

Abstract: Magnetic sludge biochar (MSB) was prepared using iron-containing municipal sludge from the Suma Park sewage treatment plant in Suzhou, Anhui province, as raw material for the adsorption of As(III) in aqueous solutions. Scanning electron microscopy (SEM), magnetic characterization (VSM), and X-ray diffraction spectroscopy (XRD) were used to investigate the physico-chemical properties of MSB. The effects of different pyrolysis temperatures, adsorbent dosage, solution pH, coexisting ions, and reaction temperature on the adsorption of As(III) by MSB were studied. The results showed that the magnetic biochar (MSB900) prepared under the pyrolysis temperature of 900˚C, in which iron was α-Fe⁰ is the main component with strong magnetism. Under the optimal reaction conditions (pyrolysis temperature of 900˚C, dosage of 0.8 g/L, pH = 3, coexistence of or , reaction temperature of 35˚C), the maximum adsorption efficiency of MSB900 for As(III) is 98.3%. Overall, magnetic sludge biochar (MSB900) prepared from iron-containing municipal sludge can serve as an effective and low-cost As(III) adsorption material.