Effect of mineral constituents on temperature-dependent structural characterization of carbon fractions in sewage sludge-derived biochar
Effect of mineral constituents on temperature-dependent structural characterization of carbon fractions in sewage sludge-derived biochar
复制标题
矿物成分对污水污泥生物炭中碳组分温度依赖性结构特征的影响
DOI：
10.1016/j.jclepro.2017.11.090
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发表时间：
2018-01-20
影响因子：
11.1
通讯作者：
Cao, Yiming
中科院分区：
文献类型：
--
作者：
Li, Mi;Tang, Yuanyuan;Cao, Yiming
碳组分的结构及其表征对于污水污泥生物炭的实际应用至关重要。然而，污水污泥中的内源矿物质成分在很大程度上影响所获得的生物炭中碳组分的结构特征。在这项研究中，采用高矿物质污泥生物炭和酸洗后的生物炭来阐明含硅和含铝矿物质对碳组分结构特征的影响。傅里叶变换红外（FTIR）光谱和X射线衍射（XRD）结果表明，高岭石、偏高岭土和石英等主要矿物会掩盖碳组分的官能团和晶体结构的呈现。拉曼光谱的峰解卷积表明，G 和 D 带的位置和峰面积比均受到硅铝酸盐信号的影响。此外，随着热解温度的升高，芳环不断发展和缩合，导致结构有序性逐渐增加，并形成结晶不良和短程有序的乱层结构。此外，矿物成分对理化性质的影响与热解温度有关，在高温（500-700℃）下孔隙率增大，但低温（200-400℃）生物炭粉末混合物堆积更紧密。从矿物成分对生物炭碳组分的温度依赖性结构表征的干扰来看，本研究表明有必要探索矿物和碳组分之间的相互作用，以增强高矿物生物炭的潜在应用。 (C) 2017 Elsevier Ltd. 保留所有权利。
The structure of carbon fractions and its characterization are critical for practical applications of the sewage sludge-derived biochar. However, the endogenous mineral constituents in sewage sludge can largely affect the structural characterization of carbon fractions in the obtained biochar. In this study, the high-mineral sludge biochar together with the biochar after acid washing was employed to explicate the effects of silicon- and aluminum-containing minerals on the structural characterization of carbon fractions. Results from Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) showed that major minerals such as kaolinite, metakaolin and quartz can obscure the presentation of functional groups and crystalline structure of carbon fractions. Peak deconvolution of Raman spectra demonstrated that both positions and peak area ratios of G and D bands were affected by the signals of aluminosilicates. Furthermore, aromatic rings developed and condensed with the increase in pyrolysis temperatures, leading to a gradual increase in structural ordering and the formation of turbostratic structures with poor crystalline and short-ranged orders. In addition, the effect of mineral constituents on physicochemical properties was related with pyrolysis temperature, which showed an enlargement in porosity at high temperatures (500-700 degrees C) but a more closely-packed powder mixture for low-temperature biochar (200-400 degrees C). From the interference of mineral constituents on temperature-dependent structure characterization of biochar carbon fractions, this study showed the necessity to explore interactions between mineral and carbon fractions to enhance potential application of high-mineral biochars. (C) 2017 Elsevier Ltd. All rights reserved.