In this work, a simple and highly efficient adsorbent for cationic dyes based on poly(sodium styrene sulfonate) functionalized graphene (PSS-rGO) was reported. PSS-rGO showed an extraordinary adsorption capacity for methylene blue (MB) with a broadened pH range, from 1085 mg g⁻¹ at pH 3.0–1300 mg g⁻¹ at pH 11.0. Remarkably, the PSS-rGO adsorbent could be easily recovered and regenerated after dye adsorption by simply heating at 200 °C for 20 min and intermittent further PSS modification by ultra-sonication for 10 min, offering a facile recovery/regeneration strategy with no secondary pollution. The experimental results of adsorption kinetics and isotherms indicate a multilayer and heterogeneous adsorption process with possibly multiple interaction mechanism. A simple survival experiment of guppy fish (Poecilia reticulata) confirmed a good bio-compatibility of PSS-rGO. These results promise the potential of PSS-rGO for efficient removal of cationic dye with zero secondary pollution.

在这项工作中，报告了一种简单高效的基于聚（苯乙烯磺酸钠）官能化石墨烯（PSS-rGO）的阳离子染料吸附剂。PSS-RGO表现出对亚甲基蓝的非凡吸附容量（MB）与加宽的pH范围内，从1085毫克克^-1在pH 3.0-1300毫克克^-1在pH 11.0。值得注意的是，染料吸附后，只需简单地在200°C下加热20分钟，然后通过超声波进行10分钟的超声波间歇性进一步PSS改性，即可轻松回收和再生PSS-rGO吸附剂，提供了一种简便的回收/再生策略，且没有二次污染。吸附动力学和等温线的实验结果表明，多层和非均相吸附过程可能具有多种相互作用机理。孔雀鱼（Poecilia reticulata）的简单存活实验证实了PSS-rGO具有良好的生物相容性。这些结果表明，PSS-rGO具有在零次生污染的情况下有效去除阳离子染料的潜力。