粉煤灰高容量吸附亚甲基蓝的改性研究

Q1 Environmental Science

Case Studies in Chemical and Environmental Engineering Pub Date : 2025-01-09 DOI:10.1016/j.cscee.2025.101101

Mardiyah Kurniasih , Nurul Hidayat Aprilita , Roto Roto , Mudasir Mudasir

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引用次数: 0

摘要

采用酸活化法和盐酸、乙酸富集SiO2对某火电厂粉煤灰废渣进行了改性。采用酸活化（FAA_HAc和FAA_HCl）和SiO2富集（SiO2_HCl和SiO2_HAc）改性FA吸附水溶液中的亚甲基蓝（MB）。通过XRF、SEM-EDX、XRD、BET和TGA等表征了改性FA的理化性质和形态特征。通过优化pH、吸附剂用量、接触时间、初始染料浓度和温度，在间歇式系统中进行了吸附研究。在pH 8.0、吸附剂用量为1.5 g/L、接触时间为75 min的条件下，FAA_HAc、FAA_HCl、SiO2_HAc和SiO2_HCl的活化能（Ea）分别为48.71、48.95、32.26和30.61 kJ mol−1，符合拟二阶模型。Langmuir、Freundlich或Temkin等温模型很好地描述了实验数据。在langmuir模型下，FAA_HAc、FAA_HCl、SiO2_HAc和SiO2_HCl在318 K下的最大吸附量（qm）分别为151.33、146.18、100.78和95.81 mg/g。qm值随温度升高而增大，表明吸热吸附过程。热力学研究表明，焓值为正（ΔH°），熵值为正（ΔS°），自由能值为负（ΔG°）发生变化，表明这是一个吸热自发过程。改性FA具有较低的活化能和较高的吸附能力，且工艺简单、成本低、环境友好，为该吸附剂在水中去除染料废水方面的应用提供了广阔的前景。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Modification of coal fly ash for high capacity adsorption of methylene blue

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Modification of coal fly ash for high capacity adsorption of methylene blue

Coal fly ash (FA) waste from local thermal power plant has been modified by acid activation and SiO₂ enrichment using hydrochloric and acetic acids. The modified FA with acid activation (FAA_HAc and FAA_HCl) and SiO₂ enrichment (SiO₂_HCl and SiO₂_HAc) were applied in the adsorption of methylene blue (MB) from aqueous solution. The physicochemical and morphological characteristics of the modified FA were characterized by XRF, SEM-EDX, XRD, BET, and TGA. The adsorption study was carried out in a batch system by optimizing pH, adsorbent dosage, contact time, initial dye concentration and temperature. The optimum adsorption is achieved at pH 8.0, adsorbent dosage of 1.5 g/L and contact time of 75 min. The experimental data fits the pseudo-second-order models and the activation energies (E_a) are 48.71, 48.95, 32.26, and 30.61 kJ mol⁻¹ for FAA_HAc, FAA_HCl, SiO₂_HAc, and SiO₂_HCl, respectively. Langmuir, Freundlich, or Temkin isotherm models described well the experimental data. The maximum adsorption capacities (q_m) of FAA_HAc, FAA_HCl, SiO₂_HAc, and SiO₂_HCl with Lamgmuir model at 318 K are 151.33, 146.18, 100.78, and 95.81 mg/g, respectively. The q_m values increase with temperature, indicating endothermic adsorption process. Themodynamic study gives the positive value of enthalpy (ΔH°) and entropy (ΔS°), and the negative value of free energy (ΔG°) changes, suggesting an endothermic and spontaneous process. The lower activation energy and higher adsorption capacity of modified FA with a simple, low-cost and eco-friendly technique provide a prospective application of the adsorbents for the removal of dye waste from aqueous solution.

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