Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, 15# Beisanhuan East Road, Chaoyang District, Beijing, 100029, PR China.
School of Life Science and Technology, Beijing University of Chemical Technology, 15# Beisanhuan East Road, Chaoyang District, Beijing, 100029, PR China.
J Environ Manage. 2019 May 15;238:473-483. doi: 10.1016/j.jenvman.2019.03.009. Epub 2019 Mar 13.
The advanced treatment of industrial wastewater often calls upon the use of highly-efficient treatment methods to remove hazardous pollutants prior to the effluent discharge. Adsorption can be used towards removing micro-pollutants. Congo Red dye is widely used in the paper and textile industry, and residual quantities are present in the process effluents. Adsorbing metal oxide nanoparticles have abundant pores of appropriate size, a large specific surface area, and can efficiently remove organic pollutants from waste water. FeCoO nanoparticle adsorbents were synthesized. Their magnetic properties facilitate their recovery. Experiments were conducted for different Congo Red concentrations and FeCoO nanoparticles dosage. The maximum Congo Red adsorption capacity of FeCoO nanoparticles at equilibrium was 128.6 mg/g. The adsorption yield of Congo Red decreased from 86.12% to 79.53% when the initial concentration of Congo Red increased from 10 mg/L to 30 mg/L, Adsorption results were modeled to define essential parameters such as the adsorption mechanisms and kinetics. A pseudo-first-order kinetic model fitted the results. The equilibrium adsorption data were moreover fitted by isotherm models, with both the Langmuir and Freundlich equations shown appropriate. The re-use of the nanoparticle adsorbent was moreover investigated for 5 successive adsorption cycles, without loss of adsorption capacity. A case study for the adsorption of Congo Red on the FeCoO nanoparticles demonstrates that the required mass of adsorbent can be calculated for any amount of Congo Red to be removed. It was demonstrated that the fairly cheap and environmentally friendly FeCoO nanoparticles have a strong adsorption and removal ability for dyes and are easy to recycle.
工业废水的高级处理通常需要使用高效的处理方法来去除危险污染物，然后再排放。吸附可用于去除微量污染物。刚果红染料广泛用于造纸和纺织工业，在工艺废水中仍有残留。吸附金属氧化物纳米粒子具有丰富的适当尺寸的孔、大的比表面积，并且可以有效地从废水中去除有机污染物。合成了 FeCoO 纳米粒子吸附剂。它们的磁性使其易于回收。进行了不同刚果红浓度和 FeCoO 纳米粒子剂量的实验。FeCoO 纳米粒子在平衡时对刚果红的最大吸附容量为 128.6mg/g。当刚果红的初始浓度从 10mg/L 增加到 30mg/L 时，刚果红的吸附率从 86.12%下降到 79.53%。吸附结果被建模以定义重要参数，如吸附机制和动力学。拟一级动力学模型拟合了结果。此外，还通过等温线模型拟合了平衡吸附数据，Langmuir 和 Freundlich 方程都适用。还研究了纳米粒子吸附剂在 5 次连续吸附循环中的再利用情况，没有失去吸附能力。刚果红在 FeCoO 纳米粒子上的吸附案例研究表明，可以计算出去除任何数量的刚果红所需的吸附剂质量。结果表明，相当便宜且环保的 FeCoO 纳米粒子对染料具有很强的吸附和去除能力，并且易于回收。
