Water-soluble dyes are common persistent organic pollutants present in textile wastewater, which are associated with environmental pollution and health hazards. The conventional effluent treatment methods are not efficient to remove these dyes from textile wastewater. Heat activated persulfate based wastewater treatment is a promising advanced oxidation process (AOP) for the treatment of textile wastewater. Therefore, the main objective of the present work was to study the degradation of Sudan Black B (SBB) dye in aqueous solution by varying activation temperature (40–60 °C), KPS dosage (250–750 ppm), and initial dye concentration (20–50 ppm). The dye degradation was found in a range of 35%−100% for varied experimental conditions. Removal percentages were improved by the increase of temperature, time, and persulfate concentration but decreased with the increase of initial dye concentration. The kinetic study indicated that the degradation of SBB dye using KPS followed first order model with rate constants varied in a range of 0.15 × 10^-2 − 40.5 × 10^-2 min^-1. Standard reaction enthalpies (ΔH˚), standard Gibbs free energies (ΔG˚), activation energies (E_a), standard entropies (ΔS˚) were found in a range of 190 − 505 kJ.mole^-1, -33.0 − 0.6 kJ, 73 − 222 kJ.mole^-1, 0.6–1.6 kJ/K for different sets of experimental conditions, respectively. Degradation reactions of SBB dye were endothermic (ΔH˚ +ve); non-spontaneous (ΔG˚ +ve) at 40 °C, but spontaneous (ΔG˚ −ve) at other temperatures (50 °C and 60 °C). Therefore, it can be predicted that heat-activated persulfate is an efficient method to achieve faster degradation of dye in the treatment of industrial wastewaters containing SBB dye.

水溶性染料是纺织品废水中常见的持久性有机污染物，与环境污染和健康危害有关。常规的废水处理方法不能有效地从纺织废水中去除这些染料。基于热活化过硫酸盐的废水处理是一种有前途的高级氧化工艺（AOP），用于处理纺织废水。因此，本研究的主要目的是通过改变活化温度（40–60°C），KPS用量（250–750 ppm）和初始染料浓度来研究苏丹黑B（SBB）染料在水溶液中的降解。 （20–50 ppm）。对于各种实验条件，发现染料的降解范围为35％-100％。温度，时间，和过硫酸盐浓度，但随着初始染料浓度的增加而降低。动力学研究表明，使用KPS降解SBB染料遵循一阶模型，速率常数在0.15×10范围内变化^-2 − 40.5×10 ^-2 min ^-1。发现标准反应焓（ΔH˚），标准吉布斯自由能（ΔG˚），活化能（E _a），标准熵（ΔS˚）在190-505 kJ.mol ^-1，-33.0-0.6 kJ范围内，73 - 222 kJ.mole ^-1，0.6-1.6千焦耳/ K分别为不同组的实验条件下，。SBB染料的降解反应是吸热的（ΔH+ ve）。在40°C时非自发（ΔG˚+ ve），但在其他温度（50°C和60°C）时自发（ΔG˚-ve）。因此，可以预见，热活化的过硫酸盐是在处理含SBB染料的工业废水中实现染料更快降解的有效方法。