Cruz G J F, Gómez M M, Solis J L, Rimaycuna J, Solis R L, Cruz J F, Rathnayake B, Keiski R L
Departamento de Ingeniería Forestal y Gestión Ambiental, Universidad Nacional de Tumbes, Av. Universitaria s/n, Campus Universitario - Pampa Grande, Tumbes, Perú E-mail:
Facultad de Ciencias, Universidad Nacional de Ingeniería, Av. Tupac Amaru 210, Lima 25, Perú.
Water Sci Technol. 2018 May;2017(2):492-508. doi: 10.2166/wst.2018.176.
Composite material (AC-ZnO) was prepared by growing ZnO nanoparticles during the production of biomass based-activated carbon (AC) via the incorporation of zinc acetate in the process. Comprehensive analyses confirmed the presence of ZnO nanoparticles over the AC surface and described the particular nature of the composite adsorbent. Methylene blue (MB) equilibrium data fitted the Dubinin-Radushkevich model. The MB adsorption capacity was higher for the bare activated carbons (197.9-188.7 mg/g) than the activated carbons with ZnO nanoparticles (137.6-149.7 mg/g). The adsorption of the MB on the adsorbents is physical because the mean adsorption energy (E) is between 1.76 and 2.00 kJ/mol. Experiments that combine adsorption and photocatalysis were carried out with different loads of adsorbents and with and without UV-light exposure. Photocatalytic activity was identified mostly at the first stage of the adsorption process and, in the case of experiments with less load of the composite AC-ZnO, because the light obstruction effect of the activated carbon is more for higher loads. The ZnO grown over AC improves the adsorption of cations such as Pb, Al and Fe in aqueous phase (polluted river water) and provides antibacterial capacity against Escherichia coli and Salmonella typhimurium.
通过在生物质基活性炭（AC）生产过程中加入醋酸锌来生长氧化锌纳米颗粒，制备了复合材料（AC-ZnO）。综合分析证实了AC表面存在氧化锌纳米颗粒，并描述了复合吸附剂的特殊性质。亚甲基蓝（MB）平衡数据符合Dubinin-Radushkevich模型。裸活性炭对MB的吸附容量（197.9-188.7 mg/g）高于含有氧化锌纳米颗粒的活性炭（137.6-149.7 mg/g）。MB在吸附剂上的吸附是物理吸附，因为平均吸附能（E）在1.76至2.00 kJ/mol之间。结合吸附和光催化的实验在不同负载量的吸附剂以及有和没有紫外线照射的情况下进行。光催化活性主要在吸附过程的第一阶段被识别，并且在复合AC-ZnO负载量较低的实验中，由于活性炭对光的阻挡作用在较高负载量时更大。在AC上生长的ZnO提高了水相（污染河水）中Pb、Al和Fe等阳离子的吸附能力，并提供了对大肠杆菌和鼠伤寒沙门氏菌的抗菌能力。
