Synergetic effect on methylene blue adsorption to biochar with gentian violet in dyeing and printing wastewater under competitive adsorption mechanism

Case Studies in Thermal Engineering

卷:26

Nanhang Dong¹  Yifeng He²  Yang Yang³  Qiaomu Zhang⁴  Qingyan Wang⁴  Qicheng Chen⁴ 

[1] Corresponding author.;

[2] College of Forestry, Henan Agricultural University, Zhengzhou 450002, China;

[3] EBRI, Aston University, Birmingham, B4 7ET, UK;

[4] School of Energy and Power Engineering, Northeast Electric Power University, Jilin 132012, China;

关键词: Biomass-derived activated carbon;    Kinetics;    Isotherm;    Dye;    Wastewater;   

DOI  :  

来源: DOAJ

【 摘 要 】

Decolorization of dyeing/printing wastewater by carbon-based materials has been carried out to study the adsorption of dye molecules onto adsorbent. Biomass-derived activated carbon (SAC) was sampled from cornstalk pyrolysis in the presence of K2CO3 as an activator. Adsorption of methylene blue (MB) and gentian violet (GV) onto SAC was examined to probe the mechanisms, isotherms, and kinetics of dye removal in single- or two-component systems. According to the adsorption rate in a single-component system, three stages were identified. The equilibrium adsorption capacity for MB onto SAC in the single-component system is 274.84 mg g−1 which is higher than that for GV of 266.57, meanwhile the pseudo-second-order (PSO) model would describe the adsorption kinetics with the correlation coefficient higher than 0.99. In the binary GV-MB system, presence of GV promoted MB adsorption to 325.15 mg g−1 and 287.73 mg g−1 at different GV concentrations while the PSO model was also applicable. Furthermore, differences between experimental and calculated values by the Freundlich and Langmuir isotherms indicated the occurrence of competitive adsorption in the two-component system. The gained insights are beneficial for removing the multiple dyes from industrial wastewater, economically and effectively and thus paving the way to the establishment of a greener society.

【 授权许可】

Unknown