不同菌糠生物炭对水体中Cu2+、Cd2+的吸附性能
Adsorption performance of Cu2+ and Cd2+ in water by different biochars derived from spent mushroom substrate
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摘要: 以菌糠废弃物为原料,采用限氧裂解法在500 ℃条件下制备香菇菌糠、猴头菇菌糠和平菇菌糠生物炭(LEBC、HEBC和POBC).利用SEM、XRD 和 FTIR等方法对吸附剂进行了表征;通过吸附动力学、等温吸附、生物炭酸化实验探究了3种菌糠生物炭去除水溶液中Cu2+、Cd2+的效果及机理.结果表明,在溶液初始pH 2—3时,3种菌糠生物炭对溶液中Cu2+、Cd2+的吸附量急剧增加.LEBC、HEBC、POBC对Cu2+、Cd2+的吸附符合准二级动力学模型,对Cu2+的吸附速率分别为10.15×10-3、7.08×10-3、0.69×10-3 mg·g-1·min-1,对Cd2+的吸附速率分别为6.53×10-3、5.19×10-3、0.26×10-3 mg·g-1·min-1.不同浓度下LEBC、HEBC、POBC对Cu2+的吸附符合Langmuir模型,最大吸附量依次为56.74、11.98、77.32 mg·g-1;而Cd2+的吸附符合Freundlich模型,最大吸附量依次为74.26、36.49、70.2 mg·g-1.LEBC在较短的时间内能达到较大的吸附量,可作为去除水体中Cu2+、Cd2+的优质吸附剂.XRD和FTIR等分析结果表明生物炭对Cu2+、Cd2+的吸附机制包括物理吸附、阳离子-π作用、官能团络合及沉淀.3种生物炭经酸化处理后,对Cu2+、Cd2+的吸附能力显著下降,表明生物炭中碳酸盐引起的Cu2+、Cd2+表面沉淀在吸附过程中起重要作用.Abstract: The biochars derived from Lentinus edodes,Hericium erinaceus and Pleurotus ostreatus (LEBC、HEBC and POBC),were prepared by limited oxygen pyrolysis at 500 ℃. The prepared biochars were characterized by SEM, XRD and FTIR. The performance and mechanism of Cu2+ and Cd2+ adsorption onto these three biochars were investigated by the experiments of adsorption kinetics, isothermal adsorption and acidification. The results showed that the adsorption capacities of both Cu2+ and Cd2+ in water increased sharply when the initial pH increased from 2 to 3;The adsorption of Cu2+ and Cd2+ by three kinds of biochars fitted well with pseudo second order kinetic model. The rates of Cu2+ adsorption on LEBC、HEBC and POBC were 10.15×10-3, 7.08×10-3 and 0.69×10-3 mg·g-1·min-1, respectively, while that of Cd2+ were 6.53×10-3, 5.19×10-3 and 0.26×10-3 mg·g-1·min-1, respectively. Adsorption of Cu2+ by LEBC、HEBC and POBC fitted well with Langmuir model, and the calculated maximum adsorption capacity of Cu2+ were 56.74、11.98、77.32 mg·g-1, respectively. However, adsorption of Cd2+ by these biochars fitted well with Freundlich model, and the calculated maximum adsorption capacity of Cd2+ calculated by Langmuir model were 74.26、36.49、70.2 mg·g-1, respectively. The higher adsorption capacity of Cu2+ and Cd2+ could be obtained by LEBC in a short time than other two, thus LEBC can be used as a high-quality adsorbent for removing Cu2+ and Cd2+ in water. The results of XRD and FTIR analysis revealed that the adsorption of Cu2+ and Cd2+ on biochar included four mechanisms: physical adsorption, cation-π interaction, functional group and chemical precipitation. After acidification treatment, the adsorption capacity of Cu2+ and Cd2+ on all biochars decreased significantly, indicating that the surface precipitation of Cu2+ and Cd2+ caused by carbonate in biochars played an important role in the adsorption process.
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Key words:
- spent mushroom substrate /
- biochar /
- Cu2+ /
- Cd2+ /
- adsorption /
- mechanism
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