▎ 摘　　要

Organic dyes are widely existing in the waste of printing and dyeing industry, which cannot be ignored due to their potential threats to human health and the environment. Development a useful and simple technology to prepare high-performance adsorbent to purify the dyes from the wastewater is always a challenging. In this work, the freeze-drying graphene (FG) is prepared through freeze-drying process method. In addition, the structural and chemical characteristics between the FG and graphene were comparatively analyzed. The results show that compare to the reference graphene, the FG is a high-efficiency adsorbent. The theoretical maximum undertakes of rhodamine B and methyl blue were 358.62 and 547.81 mg g(-1). The influence and mechanism of affecting factors were investigated, such as contact time, adsorbent dosage, pH, and temperature, to the adsorption. The results suggested that the adsorption of organic dyes on FG followed a homogeneous monolayer physical adsorption (HMPA) mechanism, and the adsorption rates were related to the number of unoccupied vacancies on the adsorbent surface. The characterization instruments of FTIR, XPS, and SEM-EDS confirmed that the HMPA contains the formation of hydrogen-bond and pi-pi interactions, electrostatic attraction, physical pore filling, and complexing adsorption. Our work, proposes a freeze-drying graphene that is a promising candidate as high-performance adsorbent to purify the dyes from the wastewater.