气凝胶
材料科学
吸附
水溶液
化学工程
石墨烯
明胶
吸热过程
氧化物
刚果红
复合数
朗缪尔吸附模型
复合材料
有机化学
纳米技术
化学
冶金
工程类
作者
Chenlu Jiao,Tingting Li,Jian Wang,Hao Wang,Xiaoli Zhang,Xiao‐Jian Han,Zhiwei Du,Yali Shang,Yuyue Chen
标识
DOI:10.1007/s10924-020-01702-1
摘要
A three-dimensional (3D) robust sodium alginate/gelatin/graphene oxide (SGGO) triple-network composite aerogel was designed using a “hydrophilic assembly–sustained release gelation” two-step method. The resulting SGGO aerogel has an ordered fishing net-like microstructure, low density (16.2 mg/cm3), high porosity (93.5%), and abundant functional groups when only 3 wt% GO was incorporated. The reinforced mechanical strength can reach 0.37 MPa and 0.12 MPa under dry and wet states, respectively, and the dry strength can still reach 0.31 MPa without a significant loss after five compression cycles. A batch adsorption experiment was performed as a function of pH, contact time and initial concentration. Adsorption behavior followed the pseudo second-order kinetic model and Langmuir isotherm, yielding the maximum monolayer adsorption capacity of 322.6 mg/g and 196.8 mg/g for Methylene blue (MB) and Congo red (CR), respectively. Moreover, thermodynamic studies indicated a spontaneous and endothermic adsorption process. After five regeneration cycles, the adsorption capacity can reach 88.4% and 86.5% of the initial values for MB and CR, demonstrating a high-performance, recyclable and promising candidate for dye wastewater treatment.
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