Frezzini Maria Agostina, Massimi Lorenzo, Astolfi Maria Luisa, Canepari Silvia, Giuliano Antonella
Department of Chemistry, Sapienza University of Rome, Piazzale Aldo Moro, 5, 00185 Rome, Italy.
Materials (Basel). 2019 Dec 17;12(24):4242. doi: 10.3390/ma12244242.
The aim of this work was to study the potential of food waste materials (banana peel, potato peel, apple peel, lemon peel, coffee waste, decaf coffee waste, grape waste, and carob peel) as low-cost adsorbents for the removal of aliphatic and aromatic volatile organic compounds (VOCs) from wastewater. The ability of examined food waste materials to adsorb VOCs from synthetic multi-component standard solutions was evaluated and the examined food waste materials showed high removal efficiency. Performances of coffee waste, grape waste, and lemon peel were detailed by using Trichloroethylene and p-Xylene in mono-component standard solutions. The adsorption capacity of the three selected food wastes was determined by using linear Langmuir and Freundlich isotherm models. Two errors functions, average percentage error (APE) and the chi-square test (χ), were used for isotherm optimization prediction. Freundlich isotherm well described the adsorption of VOCs on the considered materials. According to the obtained results, a multilayer, physical, and cooperative adsorption process was hypothesized, particularly evident when the VOCs' concentrations are high. This was confirmed by the high adsorption efficiency percentages ( > 80%) of VOCs from a real polluted matrix (urban solid waste leachate), containing high concentrations of total organic content.
这项工作的目的是研究食品废料（香蕉皮、土豆皮、苹果皮、柠檬皮、咖啡渣、脱咖啡因咖啡渣、葡萄渣和角豆果皮）作为低成本吸附剂从废水中去除脂肪族和芳香族挥发性有机化合物（VOCs）的潜力。评估了所检测的食品废料从合成多组分标准溶液中吸附VOCs的能力，所检测的食品废料显示出较高的去除效率。通过在单组分标准溶液中使用三氯乙烯和对二甲苯详细研究了咖啡渣、葡萄渣和柠檬皮的性能。使用线性朗缪尔和弗伦德里希等温线模型确定了三种选定食品废料的吸附容量。使用平均百分比误差（APE）和卡方检验（χ）这两种误差函数进行等温线优化预测。弗伦德里希等温线很好地描述了VOCs在所研究材料上的吸附情况。根据所得结果，推测存在多层、物理和协同吸附过程，当VOCs浓度较高时尤为明显。这一点通过从含有高浓度总有机含量的实际污染基质（城市固体废弃物渗滤液）中对VOCs的高吸附效率百分比（>80%）得到了证实。
