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Biochar from Agricultural By-Products for the Removal of Lead and Cadmium from Drinking Water
Water ( IF 3.4 ) Pub Date : 2020-10-20 , DOI: 10.3390/w12102933
Edgar Pineda Puglla , Diana Guaya , Cristhian Tituana , Francisco Osorio , María J. García-Ruiz

This study reports the adsorption capacity of lead Pb2+ and cadmium Cd2+ of biochar obtained from: peanut shell (BCM), “chonta” pulp (BCH) and corn cob (BZM) calcined at 500, 600 and 700 °C, respectively. The optimal adsorbent dose, pH, maximum adsorption capacity and adsorption kinetics were evaluated. The biochar with the highest Pb2+ and Cd2+ removal capacity is obtained from the peanut shell (BCM) calcined at 565 °C in 45 min. The optimal experimental conditions were: 14 g L−1 (dose of sorbent) and pH between 5 and 7. The sorption experimental data were best fitted to the Freundlich isotherm model. High removal rates were obtained: 95.96% for Pb2+ and 99.05. for Cd2+. The BCH and BZM revealed lower efficiency of Pb2+ and Cd2+ removal than BCM biochar. The results suggest that biochar may be useful for the removal of heavy metals (Pb2+ and Cd2+) from drinking water.

中文翻译:

来自农业副产品的生物炭用于去除饮用水中的铅和镉

本研究报告了分别在 500、600 和 700 °C 下煅烧的花生壳 (BCM)、“chonta”纸浆 (BCH) 和玉米芯 (BZM) 获得的生物炭对铅 Pb2+ 和镉 Cd2+ 的吸附能力。评估了最佳吸附剂剂量、pH、最大吸附容量和吸附动力学。花生壳 (BCM) 在 565 °C 下煅烧 45 分钟,可获得具有最高 Pb2+ 和 Cd2+ 去除能力的生物炭。最佳实验条件为:14 g L-1(吸附剂剂量)和 pH 值介于 5 和 7 之间。吸附实验数据最符合 Freundlich 等温线模型。获得了高去除率:95.96% 的 Pb2+ 和 99.05。对于 Cd2+。BCH 和 BZM 的 Pb2+ 和 Cd2+ 去除效率低于 BCM 生物炭。
更新日期:2020-10-20
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