Adsorptive removal of acid red 88 on cypress-sawdust-based activated carbon by microwave-assisted H3PO4 mixed with Fe/Mn/Zn activation

作者：Yuan, Jin; Yao, Lu; Xie, Ruzhen^*; Wang, Pengchen; Mo, Juan; Jiang, Wenju

来源：Desalination and Water Treatment, 2017, 100: 214-222.

DOI：10.5004/dwt.2017.21769

• Activated carbon
• Microwave
• Cypress sawdust
• Assisted activation
• Adsorption
• Acid red 88

In this study, activated carbon was produced from cypress sawdust by microwave-assisted phosphoric acid activation. Three kinds of metal salts (Fe(NO3)(3), Mn(NO3)(2) and Zn(NO3)(2)) were used as assisted activating agents to induce carbons' porosity development. The physico-chemical properties of the produced carbons were characterized, the adsorption performance of the produced carbons toward acid red 88 (AR88) were also evaluated. The results showed that with Fe(NO3)(3) assisted activation, the produced carbon (FeAC) showed highest BET surface area (1758 m(2).g(-1)) and maximum total pore volume (1.173 cm(3).g(-1)), which is 34.0% and 30.9% higher than those without metal salts assisted activation (AC), respectively. While Mn(NO3)(2) assisted activation lead to 53.8% increment of mesopore in MnAC, and resulted highest AR88 adsorptive efficiency. Three isotherm models were used to fit the adsorption data, the maximum adsorption capacity of MnAC was found to be 416.67 mg.g(-1) at 298K according to Langmuir model. The kinetics studies showed that chemical process is involved in the AR88 adsorption. The thermodynamic parameters (Delta H degrees, Delta S degrees and Delta G degrees) showed that the adsorption process was spontaneous and exothermic. The regeneration of MnAC was also evaluated. The result suggested that metal salts assisted activation can effectively turn cypress sawdust to economic and efficient adsorbents for AR88 removal.

• 出版日期2017-12
• 单位四川大学