Abstract：
Devising of materials that afforded dual applicability in decontamination and pollutant detection were still a towering challenge owing to the increasing flux of discharge toxic contaminants over the years. Herein, the NiFe2O4 nanoparticles-loaded on cube-like SrTiO3 (NiFe2O4/SrTiO3) composite was fabricated by a two-step hydrothermal approach providing remarkable photocatalytic treatment and electrochemical sensing of noxious pollutants in wastewater. The material traits of the fabricated composite were scrutinized by myriad characterization approaches. The NiFe2O4/SrTiO3 hybrid material demonstrated high surface area of 19.81 m2/g, adequate band gap energy of 2.75 eV, and prominent photoluminescence characteristics. In the presence of visible light, the NiFe2O4/SrTiO3 exhibited profound photocatalysis capability to eliminate sewage effluent-bearing chlortetracycline hydrochloride (CTCH) with 88.6% COD removal in 120 min, outperforming other pure materials. Meanwhile, the toxicity examination of effluent, the possible degradation pathway of CTCH and the proposed photocatalysis mechanism were also divulged. More importantly, the glassy carbon electrode was modified with synergized NiFe2O4/SrTiO3 (NiFe2O4/SrTiO3-GCE) was adopted for the precise quantification of Hydrazine (Hz). The NiFe2O4/SrTiO3-GCE obeyed first-order response for the Hz detection within the range of 1-10 mM: cyclic voltametric: limit of detection (LOD) of 0.119 μM with sensitivity of 18.9 μA μM-1 cm-2, and linear sweep voltametric: LOD of 0.222 μM with a sensitivity of 12.05 μA μM-1 cm-2. The stability and interference of modified electrode were also inspected. This work furnished valuable insights to yield a composite with the prominent S-scheme heterojunction system for quenching of charge carrier recombination and consequently contributing to the future realization into the domains of environmental clean-up and toxic chemical detection.
摘要：
由于多年来排放有毒污染物的通量不断增加，因此设计在去污和污染物检测中具有双重适用性的材料仍然是一个艰巨的挑战。在这里，通过两步水热方法制备了负载在立方体状SrTiO3（NiFe2O4/SrTiO3）复合材料上的NiFe2O4纳米粒子，该方法提供了出色的光催化处理和废水中有毒污染物的电化学传感。通过各种表征方法对制造的复合材料的材料特性进行了详细的研究。NiFe2O4/SrTiO3杂化材料表现出19.81m2/g的高表面积，2.75eV的足够带隙能量，和突出的光致发光特性。在可见光的存在下,NiFe2O4/SrTiO3表现出深刻的光催化能力，可以在120分钟内消除含盐酸金霉素（CTCH）的污水，COD去除率为88.6％，表现优于其他纯材料。同时,废水的毒性检查，还揭示了CTCH可能的降解途径和提出的光催化机理。更重要的是,采用协同NiFe2O4/SrTiO3（NiFe2O4/SrTiO3-GCE）修饰玻碳电极，以精确定量肼（Hz）。NiFe2O4/SrTiO3-GCE在1-10mM范围内对Hz检测服从一阶响应：循环伏安：检测限（LOD）为0.119μM，灵敏度为18.9μAμM-1cm-2，线性扫描伏安：LOD为0.222μM，灵敏度为12.05μAμM-1cm-2。并对修饰电极的稳定性和干扰进行了考察。这项工作提供了宝贵的见解，以产生具有突出的S方案异质结系统的复合材料，用于猝灭电荷载流子复合，从而有助于将来实现环境净化和有毒化学检测领域。
