Research Forest Institute (Institut de recherche sur les forêts - IRF), University of Québec in Abitibi-Témiscamingue (UQAT), 445 Boul. de l'Université, Rouyn-Noranda, QC, J9X 5E4, Canada.
Centre Technologique des Résidus Industriels (CTRI, Technology Center for Industrial Waste), Cégep de l'Abitibi-Témiscamingue (College of Abitibi-Témiscamingue), 425 Boul. du Collège, Rouyn-Noranda, QC, J9X 5E5, Canada.
Environ Sci Pollut Res Int. 2018 Sep;25(26):26562-26575. doi: 10.1007/s11356-018-2712-9. Epub 2018 Jul 11.
There is growing interest in low-cost, efficient materials for the removal of organic contaminants in municipal and industrial effluents. In this study, the efficiency of biochar and activated biochar, as promising adsorbents for phenol removal, was investigated at high (up to 1500 mg L) and low concentrations (0.54 mg L) in synthetic and real effluents (from wood-residue deposits in Québec), respectively. The performance of both materials was then evaluated in batch adsorption experiments, which were conducted using a low solid/liquid ratio (0.1 g:100 mL) at different phenol concentrations (C = 5-1500 mg L), and at 20 °C. Activated biochars presented higher phenol adsorption capacity compared to biochars due to their improved textural properties, higher micropore volume, and proportion of oxygenated carbonyl groups connected to their surface. The sorption equilibrium was reached within less than 4 h for all of materials, while the Langmuir model best described their sorption process. The maximum sorption capacity of activated biochars for phenol was found to be twofold relative to biochars (303 vs. 159 mg g). Results also showed that activated biochars were more effective than biochars in removing low phenol concentrations in real effluents. In addition, 95% of phenol removal was attained within 96 h (although 85% was removed after 4 h), thus reaching below the maximum authorized concentration allowed by Québec's discharge criteria (0.05 mg L). These results show that activated biochars made from wood residues are promising potential adsorbent materials for the efficient treatment of phenol in synthetic and real effluents.
人们对于去除城市和工业废水中有机污染物的低成本、高效材料越来越感兴趣。本研究分别以高浓度（高达 1500 mg/L）和低浓度（0.54 mg/L）的合成和实际废水（来自魁北克的木屑沉积物）为对象，研究了生物炭和活化生物炭作为去除苯酚的有前途的吸附剂的效率。然后，在不同苯酚浓度（C=5-1500 mg/L）和 20°C 下，使用低固液比（0.1 g：100 mL），在批量吸附实验中评估了这两种材料的性能。与生物炭相比，由于其改进的结构特性、更高的微孔体积和表面连接的含氧羰基比例，活化生物炭具有更高的苯酚吸附能力。所有材料的吸附平衡都在不到 4 小时内达到，而 Langmuir 模型最能描述它们的吸附过程。活化生物炭对苯酚的最大吸附容量是生物炭的两倍（303 与 159 mg/g）。结果还表明，活化生物炭在去除实际废水中低浓度苯酚方面比生物炭更有效。此外，95%的苯酚在 96 小时内被去除（尽管在 4 小时后就去除了 85%），从而达到了魁北克排放标准允许的最大浓度（0.05 mg/L）以下。这些结果表明，由木屑制成的活化生物炭是一种很有前途的潜在吸附材料，可用于有效处理合成和实际废水中的苯酚。
