Both secondary pollution and the low mechanical strength of adsorbents have severely impeded the practical application of adsorption methods in the dye wastewater treatment. In this work, we innovatively synthesized a composite hydrogel adsorbent by incorporating polydopamine (PDA) and montmorillonite (MMT) into the pullulan hydrogel matrix for dye adsorption. First, the successful formation of the resultant adsorbents was verified by Fourier-transform infrared spectroscopy and scanning electron microscope elemental mapping analysis. Then, several physicochemical properties (such as thermal and swelling properties, microarchitecture, and mechanical strength) of the five prepared adsorbents (PM1–PM5) were investigated. These results demonstrated the adsorbents had tunable properties, which can be achieved by adjusting the PDA/MMT mass ratio. Next, the dye adsorption performance was systematically explored. The resultant adsorbent (PM3) had a maximum adsorption capacity of 112.45 mg/g and its adsorption data was best described by a Langmuir isotherm and pseudo-second-order kinetic. Finally, the adsorption mechanisms and potential commercial practicability of the adsorbent were studied. Altogether, the designed adsorbent could effectively avoid generating the secondary pollution typical of adsorbents and it displayed excellent mechanical strength, thus opening up a new horizon in mitigating environmental pollution from textile industries.

二次污染和吸附剂的低机械强度都严重阻碍了吸附方法在染料废水处理中的实际应用。在这项工作中，我们通过将聚多巴胺（PDA）和蒙脱石（MMT）掺入支链淀粉水凝胶基质中以染料吸附，创新地合成了复合水凝胶吸附剂。首先，通过傅立叶变换红外光谱法和扫描电子显微镜元素图谱分析验证了所形成的吸附剂的成功形成。然后，研究了五种制备的吸附剂（PM1-PM5）的几种物理化学性质（例如，热和膨胀性质，微结构和机械强度）。这些结果表明，吸附剂具有可调的性能，可以通过调节PDA / MMT的质量比来实现。下一个，系统地研究了染料的吸附性能。所得吸附剂（PM3）的最大吸附容量为112.45 mg / g，其吸附数据最好通过Langmuir等温线和拟二级动力学描述。最后，研究了吸附剂的吸附机理和潜在的商业实用性。总体而言，设计的吸附剂可以有效避免产生典型的吸附剂二次污染，并表现出优异的机械强度，从而为减轻纺织行业的环境污染开辟了新的视野。研究了吸附剂的吸附机理和潜在的商业实用性。总体而言，设计的吸附剂可以有效避免产生典型的吸附剂二次污染，并表现出优异的机械强度，从而为减轻纺织行业的环境污染开辟了新的视野。研究了吸附剂的吸附机理和潜在的商业实用性。总体而言，设计的吸附剂可以有效避免产生典型的吸附剂二次污染，并表现出优异的机械强度，从而为减轻纺织行业的环境污染开辟了新的视野。