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老化作用对水稻秸秆生物炭吸附Cd(Ⅱ)能力的影响

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陈昱, 梁媛, 郑章琪, 施维林. 老化作用对水稻秸秆生物炭吸附Cd(Ⅱ)能力的影响[J]. 环境化学, 2016, 35(11): 2337-2343. doi: 10.7524/j.issn.0254-6108.2016.11.2016031601
引用本文: 陈昱, 梁媛, 郑章琪, 施维林. 老化作用对水稻秸秆生物炭吸附Cd(Ⅱ)能力的影响[J]. 环境化学, 2016, 35(11): 2337-2343. doi: 10.7524/j.issn.0254-6108.2016.11.2016031601
shu
CHEN Yu, LIANG Yuan, ZHENG Zhangqi, SHI Weilin. Effect of ageing on Cd adsorption ability by rice-straw derived biochar[J]. Environmental Chemistry, 2016, 35(11): 2337-2343. doi: 10.7524/j.issn.0254-6108.2016.11.2016031601
Citation: CHEN Yu, LIANG Yuan, ZHENG Zhangqi, SHI Weilin. Effect of ageing on Cd adsorption ability by rice-straw derived biochar[J]. Environmental Chemistry, 2016, 35(11): 2337-2343. doi: 10.7524/j.issn.0254-6108.2016.11.2016031601
shu

老化作用对水稻秸秆生物炭吸附Cd(Ⅱ)能力的影响

  • 1.

    苏州科技大学环境科学与工程学院, 苏州, 215011

  • 基金项目:

    国家自然科学基金（31570515，21507097），江苏省自然科学基金（BK20150288），江苏省高校自然科学研究项目（14KJD610003），苏州市科技发展支撑计划（SS201421，SS201521），安徽省高校自然科学研究重点项目（KJ2015A195），苏州市分离净化材料与技术重点实验室（SZS201512）资助.

Effect of ageing on Cd adsorption ability by rice-straw derived biochar

  • 1.

    School of Enviromental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215011, China

  • Fund Project: Supported by the National Natural Science Foundation of China(31570515, 21507097), the Natural Science Foundation of Jiangsu Province(BK20150288), the Natural Science Foundation of Universities in Jiangsu Province(14KJD610003), the Plan of Suzhou Science and Technology Development(SS201421, SS201521), Key Projects of Natural Science Research of Universities in Anhui Province(KJ2015A195), Key Laboratory of Separation and Purification Materials and Technology in Suzhou(SZS201512).

  • 摘要: 环境变化使生物炭材料发生老化作用，老化后的生物炭是否仍具有较强的吸附能力是评价生物炭对Cd修复的长期稳定性的重要指标.本文采用自然老化（Spontaneous aging，SPON），冻融循环老化（Freeze-thaw cycles aging，FTC）和高温老化（High temperature aging，HT）的方法对水稻秸秆生物炭进行2个月的人工加速老化，运用扫描电镜（SEM-EDS）、元素分析仪、傅里叶红外光谱分析仪（FTIR）研究老化作用对秸秆生物炭材料的影响，再通过等温吸附实验研究生物炭老化前后对Cd吸附性能特征的变化.结果表明，老化作用使生物炭材料局部发生破碎，增加了生物炭表面O/C比.老化作用显著影响秸秆生物炭表面的官能团，降低了生物炭表面-OH的数量，增加了C=O、-COOH和Si-O-Si的数量，出现了C≡C键，可为Cd提供更多的吸附位点.等温吸附试验进一步证明了老化后的生物炭提高了对Cd（Ⅱ）的吸附性能.与生物炭原样相比，冻融循环老化、高温老化、自然老化使生物炭的Cd最大吸附量分别达到了26.49、33.30、23.40 mg·g-1，增加了27.8%，60.7%，12.9%.本研究表明老化作用改变了生物炭材料的表观结构和官能团，增强了对Cd（Ⅱ）的吸附能力，因此生物炭对Cd的修复具有一定的长期稳定性.
    Abstract: The adsorption ability of aged biochar for Cd is a key factor of assessing the long-term stability of Cd immobilization.The aim of this study was to investgate the process of biochar aging with Spontaneous aging(SPON), Freeze-Thaw Cycles aging(FTC) and High Temperature aging(HT). The surface properties of biochar and aged biochar were characterized by scanning electron microscopy (SEM) coupled to energy dispersive spectrometry (EDS), Fourier-transformed infrared spectroscopy (FTIR), and elemental analysis. Then a batch sorption experiment was carried out to determine the Cd(Ⅱ) adsorption ability on biochar and aged biochar. The result of SEM-EDS indicated that there were no significant change in the porous structure of biochar, but some breakage was found in aged biochar. In the meanwhile, ageing process increased the O/C ratio of biochar. The FTIR analysis indicated that the hydroxyl groups were reduced, but the oxygen-containing function groups on biochar increased, such as C=O, -COOH and Si-O-Si. The increased oxygen-containing function groups may provide more adsorption sites for Cd(Ⅱ). The batch sorption experiment demonstrated that the adsorption capacity of Cd(Ⅱ) on the aged biochar were obviously improved in comparison with the original biochar. The maximum adsorption capacities were increased by 27.8%, 60.7% and 12.9%, respectively after high temperature aging, freeze-thaw cycles aging and spontaneous aging. Our results indicated that the aging effect influenced the surface properties of biochar, and the aged biochar had higher Cd adsorption capacity compared with original biochar. As a result, the Cd immobilization by biochar has long-term stability.
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  • 收稿日期:  2016-03-16
  • 刊出日期:  2016-11-15
陈昱, 梁媛, 郑章琪, 施维林. 老化作用对水稻秸秆生物炭吸附Cd(Ⅱ)能力的影响[J]. 环境化学, 2016, 35(11): 2337-2343. doi: 10.7524/j.issn.0254-6108.2016.11.2016031601
引用本文: 陈昱, 梁媛, 郑章琪, 施维林. 老化作用对水稻秸秆生物炭吸附Cd(Ⅱ)能力的影响[J]. 环境化学, 2016, 35(11): 2337-2343. doi: 10.7524/j.issn.0254-6108.2016.11.2016031601
shu
CHEN Yu, LIANG Yuan, ZHENG Zhangqi, SHI Weilin. Effect of ageing on Cd adsorption ability by rice-straw derived biochar[J]. Environmental Chemistry, 2016, 35(11): 2337-2343. doi: 10.7524/j.issn.0254-6108.2016.11.2016031601
Citation: CHEN Yu, LIANG Yuan, ZHENG Zhangqi, SHI Weilin. Effect of ageing on Cd adsorption ability by rice-straw derived biochar[J]. Environmental Chemistry, 2016, 35(11): 2337-2343. doi: 10.7524/j.issn.0254-6108.2016.11.2016031601
shu

老化作用对水稻秸秆生物炭吸附Cd(Ⅱ)能力的影响

  • 1. 苏州科技大学环境科学与工程学院, 苏州, 215011
  • 收稿日期:  2016-03-16
基金项目:

国家自然科学基金（31570515，21507097），江苏省自然科学基金（BK20150288），江苏省高校自然科学研究项目（14KJD610003），苏州市科技发展支撑计划（SS201421，SS201521），安徽省高校自然科学研究重点项目（KJ2015A195），苏州市分离净化材料与技术重点实验室（SZS201512）资助.

摘要: 环境变化使生物炭材料发生老化作用，老化后的生物炭是否仍具有较强的吸附能力是评价生物炭对Cd修复的长期稳定性的重要指标.本文采用自然老化（Spontaneous aging，SPON），冻融循环老化（Freeze-thaw cycles aging，FTC）和高温老化（High temperature aging，HT）的方法对水稻秸秆生物炭进行2个月的人工加速老化，运用扫描电镜（SEM-EDS）、元素分析仪、傅里叶红外光谱分析仪（FTIR）研究老化作用对秸秆生物炭材料的影响，再通过等温吸附实验研究生物炭老化前后对Cd吸附性能特征的变化.结果表明，老化作用使生物炭材料局部发生破碎，增加了生物炭表面O/C比.老化作用显著影响秸秆生物炭表面的官能团，降低了生物炭表面-OH的数量，增加了C=O、-COOH和Si-O-Si的数量，出现了C≡C键，可为Cd提供更多的吸附位点.等温吸附试验进一步证明了老化后的生物炭提高了对Cd（Ⅱ）的吸附性能.与生物炭原样相比，冻融循环老化、高温老化、自然老化使生物炭的Cd最大吸附量分别达到了26.49、33.30、23.40 mg·g-1，增加了27.8%，60.7%，12.9%.本研究表明老化作用改变了生物炭材料的表观结构和官能团，增强了对Cd（Ⅱ）的吸附能力，因此生物炭对Cd的修复具有一定的长期稳定性.

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