| 夏广洁,宋 萍,邱宇平.牛粪源和木源生物炭对Pb（Ⅱ）和Cd（Ⅱ）的吸附机理研究[J].农业环境科学学报,2014,33(3):569-575. |
| 牛粪源和木源生物炭对Pb（Ⅱ）和Cd（Ⅱ）的吸附机理研究 |
| Sorption of Pb（Ⅱ） and Cd（Ⅱ） by Manure-and Wood-derived Biochars |
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| DOI：10.11654/jaes.2014.03.025 |
| 中文关键词: 生物炭 重金属离子 pH 吸附 沉淀 |
| 英文关键词: biochar heavy metals pH adsorption precipitation |
| 基金项目: |
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| 摘要点击次数: 2928 |
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| 中文摘要: |
| 在700 ℃热解条件下制得牛粪源生物炭（DMBC）和木源生物炭（WC）。研究了二者对水体中Pb（Ⅱ）和Cd（Ⅱ）的吸附去除能力，分析了相关污染物去除机理。结果表明：DMBC的比表面积和碳元素含量均远小于WC，但去除效率却远高于后者。FTIR光谱分析和XRD分析表明，DMBC中含有大量矿物组分（如磷等），易与重金属离子生成沉淀。因此在吸附去除过程中发挥主导作用的是沉淀机制。Pb（Ⅱ）和Cd（Ⅱ）在DMBC上的竞争吸附和单组分吸附结果类似，验证了该结论的正确性。而Pb（Ⅱ）和Cd（Ⅱ）在WC上的单组分和双组分吸附结果相差较大，这说明重金属离子在WC上的吸附是以表面吸附为主。以上研究证实，牛粪源生物炭比木源生物炭更适合用于水体中各类重金属污染的去除。 |
| 英文摘要: |
| Biochars have been used to remove and/or fix pollutants in the environment. In this study, removal mechanisms of Pb（Ⅱ） and Cd（Ⅱ） from aqueous solutions by two types of biochars produced from dairy manure（DMBC） and wood（WC） at 700 ℃ were examined. Compared to WC, DMBC had smaller specific surface area and less carbon content, but was more effective in removal of heavy metals from aqueous solutions. FTIR and XRD analyses showed that DMBC contained mineral phosphorus, which might precipitate heavy metal ions. This mechanism was supported by the similar results obtained from single and combined sorption of Pb（Ⅱ） and Cd（Ⅱ）. However, much lower sorption of metals on WC in coexistence than in single indicated that WC adsorbed metals primarily through surface adsorption. Our research shows that dairy manure-derived biochar could be applied to remove heavy metal ions from waters. |
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