College of Petrochemical Engineering, Liaoning Shihua University, Fushun, 113001, China.
College of Petrochemical Engineering, Liaoning Shihua University, Fushun, 113001, China.
Environ Res. 2021 Apr;195:110752. doi: 10.1016/j.envres.2021.110752. Epub 2021 Jan 21.
3-Nitro-4-hydroxy-phenylarsonic acid (3-NHPAA), an organic-arsenic compound, as one of widely used antibacterial veterinary drug, has greatly attracted the attention due to its potential threats on ecological environment. A series of the nanocomposites of zirconia nanoparticles with crystal phases (pure monoclinic, pure tetragonal and mixed phase (monoclinic + tetragonal)) anchored on reduced graphene oxide were produced through managing the concentration of triethanolamine solution and the reaction time. The effects of the crystal phases of the zirconia in the structure of the nanocomposites were played a key role in the adsorption performances of the 3-NHPAA. Experiment data identified the nanocomposites with monoclinic phase of zirconia excelled at the adsorption of the 3-NHPAA with a higher adsorption capacity up to 207.2 mg g. The uptake of the 3-NHPAA by the three nanocomposites was implemented within 60 min and highly pH-dependent which illustrated electrostatic attraction between them as a main mechanism during the adsorption process. A wider pH range (3.8-8.8) for the uptake of the 3-NHPAA by the nanocomposites with the monoclinic phase of zirconia was obtained compared with the nanocomposites containing tetragonal phase (3.8-5.9) or the mixed phase (3.8-7.1) of zirconia. The adsorption of the 3-NHPAA was well described by the pseudo-second order kinetic and Langmuir equations. The thermodynamic parameters suggested that the adsorption of the 3-NHPAA over the three nanocomposites was endothermic and spontaneous in nature. In summary, the nanocomposites of reduced graphene oxide and monoclinic phase of zirconia nanoparticles as an adsorbent were better to the adsorption of the 3-NHPAA.
3-硝基-4-羟基苯胂酸（3-NHPAA）是一种有机砷化合物，作为一种广泛使用的抗菌兽用药物，由于其对生态环境的潜在威胁，引起了极大的关注。通过控制三乙醇胺溶液的浓度和反应时间，制备了一系列具有不同晶相（纯单斜相、纯四方相和混合相（单斜相+四方相））的氧化锆纳米颗粒负载在还原氧化石墨烯上的纳米复合材料。氧化锆在纳米复合材料结构中的晶相的作用对 3-NHPAA 的吸附性能起着关键作用。实验数据表明，具有单斜相氧化锆的纳米复合材料在吸附 3-NHPAA 方面表现出较高的吸附能力，最高可达 207.2mg/g。三种纳米复合材料在 60min 内即可实现对 3-NHPAA 的吸附，且对 pH 值高度依赖，这表明在吸附过程中它们之间存在静电吸引作用。与含有四方相（3.8-5.9）或混合相（3.8-7.1）的氧化锆的纳米复合材料相比，具有单斜相氧化锆的纳米复合材料对 3-NHPAA 的吸附具有更宽的 pH 范围（3.8-8.8）。3-NHPAA 的吸附可以很好地用伪二级动力学和 Langmuir 方程来描述。热力学参数表明，3-NHPAA 在三种纳米复合材料上的吸附是吸热和自发的。总之，作为吸附剂的还原氧化石墨烯和单斜相氧化锆纳米颗粒的纳米复合材料更有利于 3-NHPAA 的吸附。
