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Reusable nanocomposite-filters for arsenite and arsenate dual real effluents remediation in an up-scaled membrane reactor
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2022-08-10 , DOI: 10.1016/j.jhazmat.2022.129756
H. Salazar , P.M. Martin , M.M. Fernandes , P. Costa , S. Ferdov , G. Botelho , S. Lanceros-Mendez

A membrane reactor (MR), combining adsorption and membrane separation processes, represents a new hybrid and promising technology for arsenic-contaminated water treatment. This work reports on nanocomposite filters (NCFs) based on poly (vinylidene fluoride-hexafluoropropylene), PVDF-HFP, containing yttrium carbonate (Y2(CO3)3) and magnetite (Fe3O4) to adsorb neutral and anionic species of As(III) and As(V), in an up-scaled membrane reactor. The nano-sorbents and the NCFs were thoroughly characterised concerning morphological and physical-chemical properties. Incorporating the nano-sorbents does not affect the main characteristics of the NCF. Flow rate and pH of the media are the main parameters affecting the adsorption efficiency: lower flow rates and acidic pH are the most favorable conditions for dual As(III) and As(V) adsorption. Y@Fe3O4/PVDF-HFP adsorption follows pseudo-second-order kinetics described by Langmuir isotherm model, reaching maximum absorption capacities of 101.9 and 212.8 mg/g for As(III) and As(V), respectively. In addition, the NCFs proved to be effective for the removal of As(III) and As(V) in treated effluents and easily reactivated and reused without significant efficiency losses. Thus, Y@Fe3O4/PVDF-HFP nanocomposite filters and the designed up-scaled membrane reactor represent a straightforward, efficient, reusable, and low-cost alternative for a continuous treatment process for As(III) and As(V) remediation in real condition effluents sources.



中文翻译:

可重复使用的纳米复合过滤器,用于大型膜反应器中亚砷酸盐和砷酸盐双重实际流出物的修复

膜反应器 (MR) 结合了吸附和膜分离过程,代表了一种新的混合和有前途的砷污染水处理技术。这项工作报告了基于聚(偏二氟乙烯-六氟丙烯)、PVDF-HFP 的纳米复合过滤器 (NCF),含有碳酸钇 (Y 2 (CO 3 ) 3 ) 和磁铁矿 (Fe 3 O 4) 在放大的膜反应器中吸附 As(III) 和 As(V) 的中性和阴离子物质。对纳米吸附剂和 NCFs 的形态和物理化学性质进行了彻底的表征。加入纳米吸附剂不会影响 NCF 的主要特性。介质的流速和 pH 值是影响吸附效率的主要参数:较低的流速和酸性 pH 值是双 As(III) 和 As(V) 吸附的最有利条件。Y@Fe 3 O 4 /PVDF-HFP 吸附遵循 Langmuir 等温模型描述的准二级动力学,达到 101.9 和 212.8 的最大吸附容量 As(III) 和 As(V) 分别为 mg/g。此外,NCF 被证明可有效去除处理过的流出物中的 As(III) 和 As(V),并且易于再活化和再利用,而不会造成明显的效率损失。因此,Y@Fe 3 O 4 /PVDF-HFP 纳米复合过滤器和设计的放大膜反应器代表了一种直接、高效、可重复使用和低成本的 As(III) 和 As(V) 连续处理工艺替代方案对实际污水源进行修复。

更新日期:2022-08-10
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