Journal
CHEMOSPHERE
Volume 268, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2020.128833
Keywords
Microwave; Cellulose; Adsorption; Heavy metal; Response surface methodology
Categories
Funding
- National Natural Science Foundation of China [41877403]
- Fundamental Research Funds for the Central Public Research Institutes [2018-jbkyywf-dzl]
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The study successfully prepared a novel adsorbent RSMW-AC through microwave-assisted approach and demonstrated its excellent adsorption performance towards heavy metal ions in water. By optimizing process conditions and exploring the adsorption mechanisms, it showed potential for industrial applications in treating heavy metal-contaminated water.
The study presented the successful microwave-assisted (MW-assisted) preparation of a novel adsorbent derived from rice straw (RSMW-AC) and explored its adsorption performance toward heavy metal ions from water. The RSMW-AC was rapidly synthesized through pretreatment and one step grafting via the MW-assisted approach. The quantitative predictive correlations between target performance of RSMW-AC and process parameters were obtained through the response surface methodology (RSM). Meanwhile, the optimal preparation process conditions were determined: NaOH solution concentration, 20%; MW irradiation temperature for pretreatment, 100 and 150 degrees C; MW irradiation time for pretreatment and grafting, 10 and 60 min; EDTAD-RS mass ratio, 3. The RSMW-AC showed a good adsorption of different heavy metal ions from water (152.39, 55.46, 52.91, 35.60 and 20.11 mg g(-1) for Pb(II), Mn(II), Cd(II), Cu(II) and Ni(II), respectively). The adsorption behaviors followed the Langmuir model and pseudo second-order kinetics model with a highly significant correlation. Also of note was that amino and carboxyl groups were successfully introduced on the rice straw based on characterization results. Furthermore, preparation mechanism was explored to reveal reasons why microwave irradiation could accelerate the preparation of the adsorbent; its adsorption process was dominated by electrostatic attraction and chelation. Finally, the study made the industrial application feasibility analysis of MW-assisted approach used for pretreatment and graft reaction of agro-waste biomass. (C) 2020 Elsevier Ltd. All rights reserved.
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