新型氧化石墨烯生物纳米材料对印染废水中镉和孔雀石绿的去除性能及机制

印染废水因其成分复杂，并且难以被自然去除，己成为环境的重点污染源之一.本研究采用甘蔗渣还原液还原氧化石墨烯，并负载伯克霍尔德菌成功制备了新型生物纳米材料MNMs.采用SEM-EDS-Mapping和Raman分析证实该材料具有较好的结构稳定性和良好的吸附效果，并对印染废水的典型污染物Cd²⁺和孔雀石绿的联合去除率均达到80%以上.GC-MS检测结果证实该复合纳米材料可将孔雀石绿降解为N，N-二甲基苯胺和4-（二甲基氨基）二苯甲酮.动力学拟合分析表明Cd²⁺和孔雀石绿被MNMs吸附过程遵循伪二级速率模型（R²>0.99），而MG的降解过程更遵循伪一级速率模型（R²>0.99）.MNMs对Cd²⁺和MG的理论最大吸附量分别为84.03 mg·g^-1和45.25 mg·g^-1.研究结果表明，该生物纳米材料对水溶液中Cd²⁺和孔雀石绿有较好的去除效果，未来可应用于工业印染废水的污染控制.

Removal mechanism Cd and malachite green in printing and dyeing wastewater by novel graphene oxide nanomaterials

Printing and dyeing wastewater has become one of the important sources of environment pollution due to its complex components and is difficult to remove naturally. In this study, bagasse was used as a reducing agent of graphene oxide, and Burkholderia cepacia was loaded to prepare a new bio-nanomaterial (MNMs). SEM-EDS-Mapping and Raman characterization results showed that the bio-nanomaterial has good structural stability and adsorption capacity. The removal efficiency of Cd²⁺ and malachite green (MG) in printing and dyeing wastewater reached more than 80%. The GC-MS analysis showed that the degradation products of MG were N, N-dimethylaniline and 4-(dimethylamino) benzophenone. The kinetic analysis showed that the adsorption process of Cd²⁺ and MG by MNMs follows the pseudo second-order model (R²>0.99), and the degradation process of MG fits better with the pseudo-first-order model (R²>0.99). The maximum adsorption capacity for Cd²⁺ and MG are 84.03 mg·g^-1 and 45.25 mg·g^-1, respectively. The results indicated that the bio-nanomaterial has a good removal efficiency of Cd²⁺ and MG, and it can be used as a potential material for the treatment of printing and dyeing wastewater.