In this work, a novel ZnS/chitosan composite was fabricated as an effective catalyst for the photodegradation of Acid Brown 5G and Acid Black 2BNG carcinogenic azo dyes in the presence of ultraviolet irradiations. The as-fabricated ZnS/chitosan composite was investigated using different spectroscopic tools such as FT-IR, XRD, UV–Vis, HR-TEM, and FE-SEM. The successful synthesis of the ZnS/chitosan composite was evidenced through the obvious damage of the crystalline structure of ZnS and the appearance of characteristic XRD peaks of chitosan at 2ɵ=8.99° and 20.30°. Also, the HR-TEM and FE-SEM images of the fabricated ZnS/chitosan composite confirmed the amorphous nature of the composite via the formation of irregular shape. Besides, the estimated energy gap of ZnS/chitosan composite is 3.00 eV. At the optimum experimental conditions (pH = 7.5, irradiation time = 120 min, temperature = 35 °C, concentration of dye = 40 mg/L, volume of dye solution = 40 mL, and dosage of photocatalyst = 40 mg), the fabricated ZnS/chitosan composite showed 97.38 and 99.32% degradation for A-5G and A-2BNG dyes, respectively. The degradation process obeyed pseudo-first-order. The ZnS/chitosan composite was easily regenerated and reutilized for three sequential cycles. The data showed that the ZnS/chitosan composite is regarded as a cost-effective, highly productive, and auspicious photocatalyst.

在这项工作中，新型的ZnS /壳聚糖复合物被制成作为在紫外线照射下光降解酸性棕5G和酸性黑2BNG致癌偶氮染料的有效催化剂。使用不同的光谱工具（例如FT-IR，XRD，UV-Vis，HR-TEM和FE-SEM）研究了制成的ZnS /壳聚糖复合材料。ZnS /壳聚糖复合材料的成功合成是通过ZnS晶体结构的明显破坏和在2san = 8.99°和20.30°处出现的壳聚糖特征XRD峰证明的。同样，所制备的ZnS /壳聚糖复合材料的HR-TEM和FE-SEM图像通过形成不规则形状证实了复合材料的非晶态性质。此外，ZnS /壳聚糖复合材料的估计能隙为3.00 eV。在最佳实验条件下（pH = 7.5，照射时间= 120分钟，温度= 35°C，染料浓度= 40 mg / L，染料溶液体积= 40 mL，光催化剂用量= 40 mg），所制备的ZnS /壳聚糖复合材料的降解率为97.38和99.32％。分别用于A-5G和A-2BNG染料。降级过程服从伪一阶。ZnS /壳聚糖复合材料易于再生，可以连续三个周期再利用。数据表明，ZnS /壳聚糖复合材料被认为是一种经济高效，高产且吉祥的光催化剂。ZnS /壳聚糖复合材料易于再生，可以连续三个周期重复使用。数据表明，ZnS /壳聚糖复合材料被认为是一种经济高效，高产且吉祥的光催化剂。ZnS /壳聚糖复合材料易于再生，可以连续三个周期再利用。数据表明，ZnS /壳聚糖复合材料被认为是一种经济高效，高产且吉祥的光催化剂。