科研之友
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摘要
Pyrolusite leaching residue (PLR) was used as a low-cost adsorbent to remove methylene blue (MB) from aqueous solution by adsorbing MB and regenerating PLR in a H2O2/H2SO4 system. In this paper, the behaviors of adsorption and regeneration as well as the mechanisms of PLR were investigated. The experimental results showed that it took 180 min to reach adsorption equilibrium. The adsorption process was kinetically fitted to both pseudo-first-order and pseudo-second-order models. In isotherm equilibrium, it was better fitted to Langmuir isotherm model with a maximum adsorption capacity of 22.15 mg/g. The degradation process was influenced by degradation temperature and concentrations of H2SO4 and H2O2, whose best values were determined as 65 degrees C, 0.2% and 0.3%, respectively. PLR was proven to show good cycle performance by repeated adsorption-degradation process under appropriate conditions. In degradation process, MnO2 was extracted by sulfuric acid solution with hydrogen peroxide, which had a synergetic effect on the degradation of MB. The results will provide a novel approach for removal of dyes and resource utilization of PLR.
- 出版日期2014
- 单位四川大学
