Influence of pyrolysis temperature on lead immobilization by chemically modified coconut fiber-derived biochars in aqueous environments.
Influence of pyrolysis temperature on lead immobilization by chemically modified coconut fiber-derived biochars in aqueous environments.
复制标题
水环境中热解温度对化学改性椰子纤维生物炭固定铅的影响
DOI：
10.1007/s11356-016-7428-0
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发表时间：
2016-11
期刊：
影响因子：
--
通讯作者：
Wang H
中科院分区：
文献类型：
--
作者：
Wu W;Li J;Niazi NK;Müller K;Chu Y;Zhang L;Yuan G;Lu K;Song Z;Wang H
生物炭作为一种环境友好、高效的重金属污染物固定化材料受到了广泛的关注。在本研究中，通过在三种温度下热解得到三种类型的椰子纤维衍生生物炭，即，300、500和700 °C。此外，9种类型的生物炭制备的化学改性与氨，过氧化氢，硝酸，分别用于调查的物理化学性质的变化，阿利亚是，傅立叶变换红外光谱（FTIR），扫描电子显微镜（SEM），BET比表面积分析。采用批式吸附实验研究了生物质炭对水溶液中铅的吸附性能。结果表明，经300 °C热解和硝酸改性的生物炭的阳离子交换容量比对照提高了3倍。在300 °C热解的生物炭在氨和硝酸改性过程中产生松散的波纹状碳表面和不均匀的碳表面。在含有100 mg L−1 Pb的水溶液中，与未经处理的生物炭相比，在300 °C下热解并用氨改性的椰子生物炭对Pb的去除率从71.8%提高到99.6%。然而，化学改性并没有增强在较高温度下热解的生物炭对Pb的吸附（例如，500或700 °C），表明生物炭对化学处理的抗性随着热解温度而增加。本文的在线版本（doi：10.1007/s11356-016-7428-0）包含补充材料，可供授权用户使用。
Biochar has received widespread attention as an eco-friendly and efficient material for immobilization of toxic heavy metals in aqueous environments. In the present study, three types of coconut fiber-derived biochars were obtained by pyrolyzing at three temperatures, i.e., 300, 500, and 700 °C. In addition, nine types of biochars were prepared by chemical modification with ammonia, hydrogen peroxide, and nitric acid, respectively, which were used to investigate changes in physico-chemical properties by inter alia, Fourier transformation infrared spectrophotometry (FTIR), scanning electron microscope (SEM), and BET specific surface area analysis. Batch sorption experiments were carried out to determine the sorption capacity of the biochars for lead (Pb) in aqueous solutions. Results showed that the cation exchange capacity of biochar pyrolyzed at 300 °C and modified with nitric acid increased threefold compared to the control. Loosely corrugated carbon surface and uneven carbon surface of the biochar pyrolyzed at 300 °C were produced during ammonia and nitric acid modifications. Removal rate of Pb by the coconut biochar pyrolyzed at 300 °C and modified with ammonia was increased from 71.8 to 99.6 % compared to the untreated biochar in aqueous solutions containing 100 mg L−1 Pb. However, chemical modification did not enhance adsorption of Pb of the biochars pyrolyzed at higher temperatures (e.g., 500 or 700 °C), indicating that resistance of biochars to chemical treatment increased with pyrolysis temperature. The online version of this article (doi:10.1007/s11356-016-7428-0) contains supplementary material, which is available to authorized users.
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11.4
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