School of Energy, Materials and Chemical Engineering, Hefei University, 99 Jinxiudadao, Hefei 230601, China E-mail:
School of Energy, Materials and Chemical Engineering, Hefei University, 99 Jinxiudadao, Hefei 230601, China.
Water Sci Technol. 2023 Oct;88(7):1795-1820. doi: 10.2166/wst.2023.305.
The impact of Ba-modified peanut shell biochar (Ba-PSB) on Pb(II) removal was studied and BaCl was used as a modifier. It was shown that the PSB obtained at 750 °C had the best adsorption effect, and the Ba-PSB had a larger specific surface area and a good adsorption effect on Pb(II). At pH = 5, concentration was 400 mg/L, time was 14 h, and temperature was 55 °C, the loading amount of black peanut shell biochar (BPSB), red peanut shell biochar (RPSB), Ba-BPSB, and Ba-RPSB reached 128.050, 98.217, 379.330, and 364.910 mg/g, respectively. In addition, based on the non-linear fitting, it was found that the quasi-second-order kinetic model, and isothermal model could be applied to describe Pb(II) adsorption on PSB and Ba-PSB. The adsorption behavior of PSB unmodified and modified was a spontaneous process. Moreover, chemical modification of BPSB, RPSB, Ba-BPSB, and Ba-RPSB for hindering of -COOH and -OH groups revealed 81.81, 77.08, 86.90, and 83.65% removal of Pb(II), respectively, which was due to the participation of -COOH, while 17.61, 21.70, 12.77, and 15.06% was from -OH group, respectively. The increase of cation strength (Na, K, Ca, and Mg) will reduce the adsorption capacity of PSB for Pb(II).
研究了 Ba 改性花生壳生物炭（Ba-PSB）对 Pb(II)去除的影响，并用 BaCl2 作为改性剂。结果表明，在 750°C 下获得的 PSB 具有最佳的吸附效果，并且 Ba-PSB 具有更大的比表面积和对 Pb(II)的良好吸附效果。在 pH=5、浓度为 400mg/L、时间为 14h、温度为 55°C 的条件下，黑花生壳生物炭（BPSB）、红花生壳生物炭（RPSB）、Ba-BPSB 和 Ba-RPSB 的负载量分别达到 128.050、98.217、379.330 和 364.910mg/g。此外，基于非线性拟合，发现准二级动力学模型和等温模型可用于描述 PSB 和 Ba-PSB 对 Pb(II)的吸附。PSB 未改性和改性的吸附行为是一个自发过程。此外，BPSB、RPSB、Ba-BPSB 和 Ba-RPSB 的化学改性对-COOH 和-OH 基团的抑制作用分别导致 81.81%、77.08%、86.90%和 83.65%的 Pb(II)去除，这是由于-COOH 的参与，而-OH 基团分别导致 17.61%、21.70%、12.77%和 15.06%的 Pb(II)去除。阳离子强度（Na、K、Ca 和 Mg）的增加会降低 PSB 对 Pb(II)的吸附能力。
