Removal of dyes from wastewater specialy from textile effluents has been given considerable attention in the last few decades, not only for their health issues but also potential toxicity. Over the former few eras, TiO₂ based adsorbents have drawn worldwide attention as an efficient adsorbent for wastewater treatment due to their versatile physio-chemical characteristics. This paper outlined the synthesis of nitrogen and sulfur co-doped TiO₂ (NS/TiO₂) nanostructures and highlighted their applications in the removal of dyes, including methylene blue (MB), methyl orange (MO) and methyl red (MR). The nanostructures were characterized by using scanning electron microscopy (SEM), X-Ray Diffraction pattern (XRD), Brunauer-Emmett-Teller measurements (BET), Fourier transform infrared spectroscopy (FTIR) and Raman spectroscopy. Batch experiments of adsorption were carried out by varying solution pH, adsorbent dose, initial dye concentration and contact time. The results revealed that dye adsorption capacity increased with increased adsorbent dosage up to 0.06 g, solution pH from 1 to 14 and contact time from 20 to 140 min. However, the adsorption capacity decreases with increase in the initial dye concentration. The experimental data were analyzed by the Langmuir and Freundlich adsorption isotherms. NS/TiO₂ adsorbent exhibited a high affinity towards organic dyes due to the heterogeneous sorption capacity. The NS/TiO₂ adsorbent showed 99.4% removal efficiency for MB, 98% for MO and 96% for MR. The adsorbent could be regenerated in an acidic medium for MB and a basic medium for MO and MR with good activity, even after three repeated cycles.

在过去的几十年中，去除纺织品废水中的染料已受到相当大的关注，这不仅是因为它们的健康问题，还包括潜在的毒性。在过去的几个世纪中，基于TiO ₂的吸附剂因其广泛的理化特性而作为一种高效的废水处理吸附剂引起了全世界的关注。本文概述了氮和硫共掺杂的TiO ₂（NS / TiO ₂纳米结构，并着重介绍了它们在去除染料中的应用，包括亚甲基蓝（MB），甲基橙（MO）和甲基红（MR）。纳米结构的特征在于使用扫描电子显微镜（SEM），X射线衍射图（XRD），Brunauer-Emmett-Teller测量（BET），傅立叶变换红外光谱（FTIR）和拉曼光谱。通过改变溶液的pH值，吸附剂剂量，初始染料浓度和接触时间进行批量吸附实验。结果表明，染料吸附量随吸附剂量的增加而增加，最高可达0.06  g，溶液的pH值为1至14，接触时间为20至140。 分钟 但是，吸附能力随着初始染料浓度的增加而降低。实验数据通过Langmuir和Freundlich吸附等温线进行分析。由于异质吸附能力，NS / TiO ₂吸附剂对有机染料具有很高的亲和力。NS / TiO ₂吸附剂对MB的去除效率为99.4％，对MO的去除率为98％，对于MR的去除率为96％。即使在三个重复循环之后，吸附剂也可以在具有良好活性的MB酸性介质和MO和MR碱性介质中再生。