Malafatti João Otávio Donizette, Tavares Francine Aline, Neves Tainara Ramos, Mascarenhas Bruno Cano, Quaranta Simone, Paris Elaine Cristina
Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentação, São Carlos 13560-970, Brazil.
Department of Chemistry, Federal University of São Carlos, São Carlos 13565-905, Brazil.
Materials (Basel). 2023 Mar 18;16(6):2429. doi: 10.3390/ma16062429.
Industrial effluents and wastewater treatment have been a mainstay of environmental preservation and remediation for the last decade. Silica nanoparticles (SiO) obtained from rice husk (RH) are an alternative to producing low-cost adsorbent and agriculture waste recovery. One adsorption challenge is facilitating the adsorbate separation and reuse cycle from aqueous medium. Thus, the present work employs SiO supported on polylactic acid (PLA) nanofibers obtained by the electrospinning method for Rhodamine B (RhB) dye adsorption. The silica surface was modified with trimethylsilyl chloride (TMCS) to increase affinity towards organic compounds. As a result, the silanized surface of the silica from rice husk (RHSil) promoted an increase in dye adsorption attributed to the hydrophobic properties. The PLA fibers containing 40% SiO (w w) showed about 85-95% capacity adsorption. The pseudo-first-order kinetic model was demonstrated to be the best model for PLA:SiO RHSil nanocomposites, exhibiting a 1.2956 mg g adsorption capacity and 0.01404 min kinetic constant (k) value. In the reuse assay, PLA:SiO membranes preserved their adsorption activity after three consecutive adsorption cycles, with a value superior to 60%. Therefore, PLA:SiO nanocomposites from agricultural waste are an alternative to "low-cost/low-end" treatments and can be used in traditional treatment systems to improve dye removal from contaminated waters.
在过去十年中，工业废水处理一直是环境保护和修复的支柱。从稻壳（RH）中获得的二氧化硅纳米颗粒（SiO）是生产低成本吸附剂和回收农业废弃物的一种替代方法。一个吸附挑战是促进吸附质从水介质中的分离和再利用循环。因此，本工作采用通过静电纺丝法获得的负载在聚乳酸（PLA）纳米纤维上的SiO用于罗丹明B（RhB）染料吸附。用三甲基氯硅烷（TMCS）对二氧化硅表面进行改性，以增加对有机化合物的亲和力。结果，稻壳二氧化硅（RHSil）的硅烷化表面由于其疏水特性促进了染料吸附的增加。含有40% SiO（w w）的PLA纤维显示出约85-95%的吸附容量。伪一级动力学模型被证明是PLA:SiO RHSil纳米复合材料的最佳模型，其吸附容量为1.2956 mg g，动力学常数（k）值为0.01404 min。在再利用试验中，PLA:SiO膜在连续三个吸附循环后保留了其吸附活性，其值超过60%。因此，来自农业废弃物的PLA:SiO纳米复合材料是“低成本/低端”处理方法的一种替代方案，可用于传统处理系统以提高从受污染水中去除染料的效果。
