| 陈乔,任心豪,贺飞,杨淑媛,郭军康.定量分析秸秆和猪粪生物炭对镉的吸附作用[J].农业环境科学学报,2021,40(3):668-676. |
| 定量分析秸秆和猪粪生物炭对镉的吸附作用 |
| Quantitative analysis of the adsorption of cadmium on wheat straw and pig manure biochar |
| 投稿时间：2020-08-19 |
| DOI：10.11654/jaes.2020-0974 |
| 中文关键词: 秸秆 猪粪 生物炭 镉 吸附机理 定量分析 |
| 英文关键词: wheat straw pig manure biochar cadmium adsorption mechanism quantitative analysis |
| 基金项目:国家自然科学基金青年科学基金项目（41703106）；陕西省自然科学研究计划——一般项目（2020JQ-719）；陕西科技大学研究基金项目（2016BJ-37） |
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| 中文摘要: |
| 为定量研究生物炭对镉（Cd）的吸附作用，以灰分含量不同的小麦秸秆（W）和猪粪（P）为原材料，分别在300℃和700℃下热解制备4种生物炭（WBC300、WBC700、PBC300和PBC700），定量分析了生物炭对Cd的吸附作用。结果表明：除灰后生物炭对Cd的吸附能力显著下降38.5%~83.0%，且除灰处理对BC700影响较BC300大。生物炭无机组分主要通过沉淀作用和离子交换作用吸附溶液中的Cd，有机组分主要通过含氧官能团的络合作用吸附Cd。在pH 5.0、Cd初始浓度为200 mg·L-1条件下，沉淀作用、离子交换作用和络合作用在PBC300吸附Cd的过程中贡献率分别为52.1%、32.2%和15.5%，PBC700分别为91.9%、5.10%和2.96%，WBC300分别为23.9%、36.2%和39.9%，WBC700分别为63.5%、21.8%和14.7%。研究表明，随着生物炭热解温度的升高，沉淀作用在生物炭吸附Cd的过程中贡献率升高，而离子交换作用和络合作用贡献率下降；无机沉淀作用和离子交换作用为灰分含量较高的生物炭吸附Cd的主要机理。 |
| 英文摘要: |
| To quantitatively analyze the adsorption of cadmium(Cd) on biochar, four types of biochar(WBC300, WBC700, PBC300 and PBC700) derived from wheat straw and pig manure were prepared by pyrolysis at 300℃ and 700℃. The adsorption of cadmium by biochar was investigated. The results showed that the treatment by acid washing decreased the sorption capacity of biochar by 38.5%~83.0%, and the effect of ash washing of BC700 was greater than that of BC300. The inorganic components of biochar adsorbed Cd in solution mainly through precipitation and ion exchange, whereas the organic components adsorbed Cd by complexing with oxygencontaining functional groups. Under the experimental conditions(pH=5.0, the initial concentration of Cd was 200 mg·L-1), for PBC300, the contribution of precipitation, ion exchange and complexation to the adsorption of Cd were 52.1%, 32.2% and 15.5%, respectively; for PBC700, they were 91.9%, 5.10% and 2.96%, respectively; for WBC300, they were 23.9%, 36.2% and 39.9%, respectively; and for WBC700, they were 63.5%, 21.8% and 14.7%, respectively. With the increase in biochar pyrolysis temperature, the contribution rate of precipitation in Cd adsorption increases, while the contribution rate of ion exchange and complexation decreases. Inorganic precipitation and ion exchange are the main mechanisms of Cd adsorption by biochar prepared at high temperature with high ash content. |
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