School of Materials Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China.
Institute of Chemistry, Henan Academy of Sciences, Zhengzhou 450002, China.
Int J Biol Macromol. 2024 Jan;255:128263. doi: 10.1016/j.ijbiomac.2023.128263. Epub 2023 Nov 19.
DOTA@Sludge@Chitosan was synthesized by a facile treatment using DOTA (1,4,7,10-tetraazacyclododecane-N,N',N,N'-tetraacetic acid) to modify dry sludge and chitosan in an acidic solution. The performance of developed DOTA@Sludge@Chitosan was investigated for the adsorptive removal of Cr and Pb from water. Characterization studies showed that the materials possess a large surface area (52.009 m/g), pore volume (0.069 cm/g), and abundant functional groups of amino and hydroxyl. The prepared material showed a synergetic effect due to carboxylic acid and sludge, effectively removing Cr and Pb. It reached 329.4 mg/g (Pb) and 273.3 mg/g (Cr) at 20 °C, much higher than commercial activated carbon. The regeneration of the adsorbent was tested for six adsorption and desorption cycles. The results demonstrate that the DOTA@Sludge@Chitosan adsorbent well-maintained high adsorption capacity attributed to its stability, making it a promising adsorbent for heavy metals removal from industrial effluent.
DOTA@Sludge@壳聚糖通过使用 DOTA（1,4,7,10-四氮杂环十二烷-N,N',N,N'-四乙酸）在酸性溶液中修饰干污泥和壳聚糖的简便处理合成。研究了开发的 DOTA@Sludge@壳聚糖在从水中吸附去除 Cr 和 Pb 方面的性能。表征研究表明，这些材料具有大的表面积（52.009 m/g）、孔体积（0.069 cm/g）和丰富的氨基和羟基官能团。由于存在羧酸和污泥，制备的材料表现出协同效应，可有效去除 Cr 和 Pb。在 20°C 下，其对 Pb 的去除率达到 329.4 mg/g，对 Cr 的去除率达到 273.3 mg/g，远高于商业活性炭。还对吸附剂的再生进行了六次吸附和解吸循环测试。结果表明，DOTA@Sludge@壳聚糖吸附剂由于其稳定性，保持了较高的吸附容量，是一种从工业废水中去除重金属的有前途的吸附剂。
