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首页> 美国卫生研究院文献>Royal Society Open Science >Removal of toxic metals from aqueous solution by biochars derived from long-root Eichhornia crassipes
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Removal of toxic metals from aqueous solution by biochars derived from long-root Eichhornia crassipes

机译：通过长根凤眼莲的生物炭去除水溶液中的有毒金属

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摘要

Biochars were produced from long-root Eichhornia crassipes at four temperatures: 200, 300, 400 and 500°C, referred to as LEC200, LEC300, LEC400 and LEC500, respectively. The sorption ability of lead, zinc, copper and cadmium from aqueous solutions by four kinds of biochars was investigated. All the biochars had lower values of CEC and higher values of pH. LEC500 was the best one to bind toxic metals which can be reflected in the results of SEM, BET and elemental analyser. It was also found that alkyl, carboxyl, phosphate and cyano groups in the biochars can play a role in binding metals. In addition, the sorption processes of four metals by the biochars in different metal concentration were all excellently represented by the pseudo-second-order model with all correlation coefficients R2 > 0.95. And the sorption processes of four metals in different temperatures could be described satisfactorily by the Langmuir isotherms. According to calculated results by the Langmuir equation, the maximum removal capacities of Pb(II), Zn(II), Cu(II) and Cd(II) at 298 K were 39.09 mg g−1, 45.40 mg g−1, 48.20 mg g−1 and 44.04 mg g−1, respectively. The positive value of the ΔH0 confirmed the adsorption process was endothermic and the negative value of ΔG0 confirmed the adsorption process was spontaneous. The sorption capacities were compared with several other lignocellulosic materials which implied the potential of long-root Eichhornia crassipes waste as an economic and excellent biosorbent for eliminating metal ions from contaminated waters.
机译：生物炭是从长根凤眼莲在200、300、400和500°C的四个温度下生产的，分别称为LEC200，LEC300，LEC400和LEC500。研究了四种生物炭对水溶液中铅，锌，铜和镉的吸附能力。所有生物炭均具有较低的CEC值和较高的pH值。 LEC500是结合有毒金属的最佳选择，这可以在SEM，BET和元素分析仪的结果中得到反映。还发现生物炭中的烷基，羧基，磷酸根和氰基可与金属结合。此外，在不同金属浓度下生物炭对四种金属的吸附过程均通过拟二阶模型很好地表示，所有相关系数R 2 -1 ，分别为45.40 mg g -1 ，48.20 mg g -1 和44.04 mg g -1 。 ΔH 0 的正值表明吸附过程是吸热的，而ΔG 0 的负值表明吸附过程是自发的。将吸附能力与其他几种木质纤维素材料进行了比较，这暗示了长根凤眼莲废弃物作为一种经济，优异的生物吸附剂，可以消除污染水中的金属离子，具有潜在的潜力。

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