de Carvalho Eufrásio Pinto Marina, David da Silva Demetrius, Amorim Gomes Ana Luiza, Leite Victor Dos Santos Azevedo, Fialho E Moraes Allan Robledo, Ferreira de Novais Roberto, Tronto Jairo, Pinto Frederico Garcia
Federal University of Viçosa, Department of Agricultural Engineering, Campus Universitário Viçosa MG CEP 36570-000 Brazil.
Federal University of Viçosa, Institute of Exact Science, Campus de Rio Paranaíba Rodovia BR 354 km 310, Rio Paranaíba MG CEP 38810-000 Brazil
RSC Adv. 2019 Feb 14;9(10):5620-5627. doi: 10.1039/c8ra06655h. eCollection 2019 Feb 11.
Phosphorus (P) is a nutrient necessary for agricultural production and a potential originator for eutrophication in water bodies, resulting in qualitative changes; it may also affect the aquatic ecosystem and human health. In addition, as a finite resource, the importance of studying strategies to remove it from water is evident, thus making possible its recycling. Many studies have used powdered materials, including biochars, for P water decontamination; however, the difficulty of separating and collecting these materials from water after adsorption may be difficult. Therefore, using hybrid materials in which the fine particles (powder) are impregnated into larger, solid particles by means of a polymeric host can facilitate collection and reuse after P adsorption. In this context, this study aimed the synthesis and characterization of a new hybrid film formed by the biopolymer cellulose acetate (CA) and biochar (FAC-B) for P adsorption in aqueous solution. We obtained biochar from the pyrolysis of carrot residue ( L.) and doped it with magnesium. As a biodegradable polymer and the most abundant natural polysaccharide in the environment, using CA as a biochar support material is an environmentally friendly alternative. We prepared the CA film with the casting method, and the biochar was inserted into the filmogenic solution in the same amount as the CA. The film was characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), molecular absorption spectroscopy in the infrared region with an attenuated total reflectance (FTIR/ATR) accessory, and X-ray Photoelectron Spectroscopy (XPS). We evaluated the thickness, weight, density, HO uptake and HO solubility of the produced FAC-B. The maximum adsorption capacity of P by FAC-B was 21.57 mg g, in agreement with the Langmuir isotherm model. The adsorption value suggests that the film has the potential to be used as an efficient P adsorbent in water.
磷（P）是农业生产所需的一种养分，也是水体富营养化的潜在引发因素，会导致水质变化；它还可能影响水生生态系统和人类健康。此外，作为一种有限的资源，研究从水中去除磷的策略的重要性不言而喻，这使得磷的回收利用成为可能。许多研究使用了包括生物炭在内的粉末材料来净化含磷水体；然而，吸附后从水中分离和收集这些材料可能存在困难。因此，通过聚合物载体将细颗粒（粉末）浸渍到较大的固体颗粒中形成的混合材料，有助于在磷吸附后进行收集和再利用。在此背景下，本研究旨在合成并表征一种由生物聚合物醋酸纤维素（CA）和生物炭（FAC - B）形成的新型混合膜，用于水溶液中磷的吸附。我们通过胡萝卜残渣（L.）的热解获得生物炭，并对其进行镁掺杂。作为一种可生物降解的聚合物以及环境中最丰富的天然多糖，使用CA作为生物炭载体材料是一种环保的选择。我们采用流延法制备CA膜，并将与CA等量的生物炭插入成膜溶液中。通过X射线衍射（XRD）、热重分析（TGA）、差示扫描量热法（DSC）、配备衰减全反射附件的红外区域分子吸收光谱（FTIR/ATR）以及X射线光电子能谱（XPS）对该膜进行了表征。我们评估了所制备的FAC - B 的厚度、重量、密度、吸水率和水溶解度。FAC - B 对磷的最大吸附容量为21.57 mg/g，符合朗缪尔等温线模型。该吸附值表明该膜有潜力用作水中高效的磷吸附剂。
