<br>重塑环境可持续性：家禽副产品沼渣价值化以提高生物炭去除亚甲蓝的性能,Journal of Environmental Management

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重塑环境可持续性：家禽副产品沼渣价值化以提高生物炭去除亚甲蓝的性能
Journal of Environmental Management ( IF 8.0 ) Pub Date : 2023-12-22 , DOI: 10.1016/j.jenvman.2023.119870
Ayoub Chaoui ₁ , Salaheddine Farsad ₁ , Aboubakr Ben Hamou ₁ , Asma Amjlef ₁ , Nisrine Nouj ₁ , Mohamed Ezzahery ₁ , Noureddine El Alem ₁

Affiliation

厌氧消化是一种高效且创新的方法，可在处理有机废物的同时产生能量。然而，处理所得沼渣仍然是一项具有挑战性的工作。为了解决这个问题，本研究使用家禽副产品沼渣在两种不同的热解温度（500/600 °C）下制备生物炭。尽管它们具有潜力，但由于吸附能力不足，未经处理的生物炭的使用受到限制。因此，使用 HNO3 或 KOH 对每个生物炭进行化学活化，以合成四种活化的生物炭（BC5@KOH、BC6@HNO3、BC5@HNO3 和 BC6@HNO3）。目的是研究化学活化的性质和热解温度如何影响亚甲基蓝染料的吸附。利用 X 射线衍射（XRD）、傅里叶变换红外光谱（FTIR）、拉曼光谱、扫描电子显微镜（SEM）、拉曼分析和 pHpzc 测定等表征技术，全面阐明未加工和化学活化生物炭的结构和组成。在活化的生物炭中，吸附剂 BC5@HNO3 表现出最高的亚甲蓝（MB）吸附能力，在 298 K 下达到 101.72 mg.g-1（pH = 2，ads 剂量 = 0.6 g.L-1，摇动时间为 20 分钟），作为 MB 吸附的最佳条件。每种吸附剂的吸附数据与 Langmuir 等温线模型和准二级动力学模型高度一致。此外，热力学研究表明，吸附过程是吸热和自发的。使用各种分析技术探索 MB 染料的吸附机制，包括 FTIR、SEM、PZC 和 pH 影响评估。研究结果表明，它们与静电相互作用、氢键、孔填充以及 n-π 和 π-π 相互作用之间存在相关性。显然，活化生物炭在有效去除亚甲基蓝染料方面发挥着至关重要的作用，展示了它们作为环保和有效吸附剂的潜力。

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Reshaping environmental sustainability: Poultry by-products digestate valorization for enhanced biochar performance in methylene blue removal

Anaerobic digestion is a highly effective and innovative method for treating organic waste while simultaneously generating energy. However, the treatment of the resulting digestate remains a challenging endeavor. To address this issue, poultry by-products digestate is used in this study to prepare biochars at two different pyrolysis temperatures (500/600 °C). Despite their potential, the utilization of untreated biochar is restricted due to its inadequate adsorption capacity. Therefore, each biochar was chemically activated using either HNO3 or KOH to synthesize four activated biochars (BC5@KOH, BC6@HNO3, BC5@HNO3, and BC6@HNO3). The aim is to investigate how the nature of chemical activation and pyrolysis temperature influence the adsorption of methylene blue dye. Characterization techniques, including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, scanning electron microscopy (SEM), Raman analysis, and pHpzc determination, were exploited to comprehensively elucidate the structure and composition of both unprocessed and chemically activated biochars. Among the activated biochars, the adsorbent BC5@HNO3 exhibits the highest methylene blue (MB) adsorption capacity, reaching 101.72 mg.g−1 at 298 K under (pH = 2, ads dose = 0.6 g.L−1, shaking time of 20 min, as optimal conditions for MB adsorption. Adsorption data for each adsorbent strongly aligns with both the Langmuir isotherm model and the pseudo-second-order kinetic model. Moreover, the thermodynamic study reveals that the adsorption process was endothermic and spontaneous. The adsorption mechanism of MB dye was explored using various analytical techniques, including FTIR, SEM, PZC, and pH impact assessment. The findings suggest correlations with electrostatic interactions, hydrogen bonding, pore filling, as well as n-π and π-π interactions. Apparently, activated biochars play a crucial role in efficiently removing methylene blue dye, showcasing their potential as environmentally friendly and effective adsorbents.

更新日期：2023-12-22

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