Water Conservancy and Civil Engineering College, Shandong Agricultural University, Tai'an, Shandong 271018, PR China.
Water Conservancy and Civil Engineering College, Shandong Agricultural University, Tai'an, Shandong 271018, PR China.
J Environ Manage. 2014 Feb 15;134:109-16. doi: 10.1016/j.jenvman.2014.01.007. Epub 2014 Jan 29.
The adsorption of Cu(II) onto raw litchi pericarp (LP) and modified litchi pericarp (MLP) as a function of pH, adsorbent dose and contact time, were investigated. Adsorption equilibrium isotherms, kinetics, and thermodynamics were studied to characterize the adsorption process. Leaching assays were also conducted to evaluate the potential contamination risk of LP and MLP to aqueous systems. The maximum adsorption of Cu(II) onto MLP was occurred at the pH of 6.0, adsorbent dose of 10.0 g/L, and contact time of 60 min, respectively. The adsorption process of Cu(II) onto LP and MLP were described well by both Langmuir and Freundlich isotherms, and the adsorption kinetics of Cu(II) on MLP was pseudo-second-order. Cu(II) adsorption onto LP and MLP are both exothermic, while it is spontaneous for MLP, and non-spontaneous for LP. The maximum adsorption capacity of Cu(II) onto MLP was 23.70 mg/g, which was about 2.7 times higher than that of LP. Additionally, as compared to LP, the leaching amounts of TOC, TN, and TP from MLP were significantly reduced by a percentage of 27.0%, 90.3%, and 35.3%, respectively.
研究了 pH 值、吸附剂用量和接触时间对 Cu(II)在原荔枝果皮（LP）和改性荔枝果皮（MLP）上吸附的影响。研究了吸附平衡等温线、动力学和热力学，以表征吸附过程。还进行了浸出试验，以评估 LP 和 MLP 对水系统的潜在污染风险。MLP 对 Cu(II)的最大吸附发生在 pH 为 6.0、吸附剂用量为 10.0 g/L 和接触时间为 60 min 时。LP 和 MLP 对 Cu(II)的吸附过程均较好地符合 Langmuir 和 Freundlich 等温线，MLP 上 Cu(II)的吸附动力学符合拟二级动力学。Cu(II)在 LP 和 MLP 上的吸附均为放热过程，而 MLP 上的吸附是自发的，LP 上的吸附是非自发的。MLP 对 Cu(II)的最大吸附容量为 23.70 mg/g，约为 LP 的 2.7 倍。此外，与 LP 相比，MLP 中 TOC、TN 和 TP 的浸出量分别降低了 27.0%、90.3%和 35.3%。
