Mohamed Abdoul-Latif Fatouma, Ainane Ayoub, Hachi Touria, Abbi Rania, Achira Meryem, Abourriche Abdelmjid, Brulé Mathieu, Ainane Tarik
Medicinal Research Institute, Centre d'Etudes et de Recherche de Djibouti, IRM-CERD, Route de l'Aéroport, Haramous B.P. 486, Djibouti City 77101, Djibouti.
Superior School of Technology of Khenifra, University of Sultan Moulay Slimane, BP 170, Khenifra 54000, Morocco.
Molecules. 2023 May 24;28(11):4310. doi: 10.3390/molecules28114310.
This work investigates olive pomace from olive mill factories as an adsorbent for the removal of total phenols from olive mill effluent (OME). This pathway of valorization of olive pomace reduces the environmental impact of OME while providing a sustainable and cost-effective wastewater treatment approach for the olive oil industry. Olive pomace was pretreated with water washing, drying (60 °C) and sieving (<2 mm) to obtain the raw olive pomace (OPR) adsorbent material. Olive pomace biochar (OPB) was obtained via carbonization of OPR at 450 °C in a muffle furnace. The adsorbent materials OPR and OPB were characterized using several basic analyzes (Scanning Electron Microscopy-Energy-Dispersive X-ray SEM/EDX, X-ray Diffraction XRD, thermal analysis DTA and TGA, Fourier transform infrared FTIR and Brunauer, Emmett and Teller surface BET). The materials were subsequently tested in a series of experimental tests to optimize the sorption of polyphenols from OME, investigating the effects of pH and adsorbent dose. Adsorption kinetics showed good correlation with a pseudo-second-order kinetic model as well as Langmuir isotherms. Maximum adsorption capacities amounted to 21.27 mg·g for OPR and 66.67 mg·g for OPB, respectively. Thermodynamic simulations indicated spontaneous and exothermic reaction. The rates of total phenol removal were within the range of 10-90% following 24 h batch adsorption in OME diluted at 100 mg/L total phenols, with the highest removal rates observed at pH = 10. Furthermore, solvent regeneration with 70% ethanol solution yielded partial regeneration of OPR at 14% and of OPB at 45% following the adsorption, implying a significant rate of recovery of phenols in the solvent. The results of this study suggest that adsorbents derived from olive pomace may be used as economical materials for the treatment and potential capture of total phenols from OME, also suggesting potential further applications for pollutants in industrial wastewaters, which can have significant implications in the field of environmental technologies.
本研究考察了橄榄油加工厂的橄榄果渣作为吸附剂用于去除橄榄油厂废水（OME）中总酚的性能。这种橄榄果渣的增值途径减少了OME对环境的影响，同时为橄榄油行业提供了一种可持续且经济高效的废水处理方法。橄榄果渣经过水洗、干燥（60℃）和筛分（<2mm）预处理，以获得粗橄榄果渣（OPR）吸附材料。通过在马弗炉中于450℃对OPR进行碳化获得橄榄果渣生物炭（OPB）。使用多种基本分析方法（扫描电子显微镜-能量色散X射线SEM/EDX、X射线衍射XRD、热分析DTA和TGA、傅里叶变换红外光谱FTIR以及布鲁诺尔、埃米特和泰勒比表面积BET）对吸附材料OPR和OPB进行了表征。随后，对这些材料进行了一系列实验测试，以优化从OME中吸附多酚的过程，研究pH值和吸附剂剂量的影响。吸附动力学与伪二级动力学模型以及朗缪尔等温线显示出良好的相关性。OPR和OPB的最大吸附容量分别为21.27mg/g和66.67mg/g。热力学模拟表明反应是自发且放热的。在总酚浓度为100mg/L的稀释OME中进行24小时间歇吸附后，总酚去除率在10%-90%范围内，在pH=10时观察到最高去除率。此外，用70%乙醇溶液进行溶剂再生后，吸附后的OPR和OPB分别有14%和45%的部分再生，这意味着溶剂中酚的回收率较高。本研究结果表明，源自橄榄果渣的吸附剂可作为经济材料用于处理和潜在捕获OME中的总酚，也暗示了其在工业废水中污染物处理方面的潜在进一步应用，这可能对环境技术领域产生重大影响。
