International Joint Research Center of Green Energy Chemical Engineering, East China University of Science and Technology, Meilong Road 130, Shanghai, 200237, PR China.
Shanghai Baosteel New Building Materials Technology Co., LTD, Mohe Road 301, Shanghai, 201900, PR China.
Environ Res. 2022 Sep;212(Pt D):113450. doi: 10.1016/j.envres.2022.113450. Epub 2022 May 19.
The steel slag was investigated for the removal of p-nitrophenol (4-NP) from simulated sewage by batch adsorption and fixed-bed column absorption experiments. The results showed that the maximum adsorption capacity was 109.66 mg/g at 298 K, pH of 7, initial concentration 100 mg/L, and dose 0.8 g/L. The adsorption process fitted the Langmuir isothermal adsorption model and followed pseudo-second-order kinetic models, the activation energy of adsorption (Ea) was 10.78 kJ/mol, which indicated that the adsorption was single-molecule layer physical adsorption. The regeneration efficiency was still maintained at 84.20% after five adsorption-desorption cycles. The column adsorption experiments showed that the adsorption capacity of the Thomas model reached 13.69 mg/g and the semi-penetrating time of the Yoon-Nelson model was 205 min at 298 K. FeO was identified as the main adsorption site by adsorption energy calculation, XRD and XPS analysis. The FT-IR, Zeta potential, and ionic strength analysis indicated that the adsorption mechanism was hydrogen bonding interaction and electrostatic interaction. This work proved that steel slag could be utilized as a potential adsorbent for phenol-containing wastewater treatment.
采用静态吸附和固定床柱吸附实验研究了钢渣对模拟废水中对硝基苯酚（4-NP）的去除效果。结果表明，在 298 K、pH 值为 7、初始浓度为 100 mg/L、投加量为 0.8 g/L 的条件下，钢渣对 4-NP 的最大吸附容量为 109.66 mg/g。吸附过程符合 Langmuir 等温吸附模型和准二级动力学模型，吸附的活化能（Ea）为 10.78 kJ/mol，表明吸附为单分子层物理吸附。经过 5 次吸附-解吸循环后，再生效率仍保持在 84.20%。固定床柱吸附实验表明，在 298 K 下，Thomas 模型的吸附容量达到 13.69 mg/g，Yoon-Nelson 模型的半穿透时间为 205 min。通过吸附能计算、XRD 和 XPS 分析，确定 FeO 是钢渣吸附 4-NP 的主要活性位。FT-IR、Zeta 电位和离子强度分析表明，吸附机制为氢键相互作用和静电相互作用。该研究证明钢渣可用作含酚废水处理的潜在吸附剂。
