花生壳生物炭对铵态氮的吸附性能研究

doi:10.11924/j.issn.1000-6850.casb15060035

摘要/Abstract

摘要： 为揭示生物炭对铵态氮的吸附性能，以花生壳为原料，低氧热解(300℃)制备生物炭，采用批量平衡吸附法，研究花生壳生物炭对铵态氮(NH4+-N)的吸附机制及影响因素。研究结果表明：生物炭吸附NH4+-N的量随溶液NH4+-N初始浓度增加而增加，当初始浓度接近100 mg/L 时，吸附趋于饱和，最大吸附量达5.79 mg/g。Langmuir 能较好地拟合花生壳生物炭对NH4+-N等温吸附数据，表明吸附是以单层吸附为主导。生物炭对NH4+-N的吸附约30 min 达到平衡，伪二级动力学方程能较好地描述其吸附动态；随生物炭添加量的增加，其对NH4+-N的吸附量下降，而吸附率逐渐增加，100 mg/L吸附体系中，生物炭适宜添加量为0.6 g/50 mL，最大吸附率达40%。生物炭吸附NH4+-N的量随溶液pH升高而增加，当体系pH 9.0 时，吸附量高达8.8 mg/g。可见，溶液NH4+-N初始浓度、生物炭添加量及pH是影响生物炭吸附性能的重要因素。

关键词: 种子, 种子, 微生物, 种子活力

Abstract: In order to reveal the adsorption performance of biochar to ammonium nitrogen, peanut shell was used as raw material to prepare biochar through low-oxygen pyrolysis (300°C), and a batched equilibrium adsorption method was adopted to study the adsorption mechanism and influencing factors of peanut shell biochar (PSB) to ammonium nitrogen (NH4 -N). The results showed that the adsorption amount of NH4 -N by biochar increased with the increase of initial concentration of NH4 -N in solution, the adsorption tended to be saturated when the initial concentration was close to 100 mg/L, and the maximum adsorption amount was 5.79 mg/g. Langmuir could effectively fit the isothermal adsorption data of PSB to NH4 -N, which indicated that monolayer adsorption was dominant in the adsorption. The adsorption of NH4 - N by biochar reached equilibrium in about 30 min, and the pseudo second order kinetics equation could effectively describe its adsorption dynamic; the adsorption amount of NH4 -N decreased and the adsorption rate increased gradually with the increase of addition amount of biochar, the suitable addition amount of biochar was 0.6 g every per 50 mL in the adsorption system of 100 mg/L, and the maximal adsorption rate was 40%. The adsorption amount of NH4 -N by biochar increased with the increase of pH, the adsorption amount reached 8.8 mg/g when the pH was 9.0. Therefore, the initial concentration of NH4 -N in solution, the addition of biochar and the pH value were the important factors which could affect the adsorption performance of biochar.

中图分类号:

X703
X71

张聪智,苏亚拉图,赖欣,李洁,张贵龙. 花生壳生物炭对铵态氮的吸附性能研究[J]. 中国农学通报, 2015, 31(33): 214-220.

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