Limited Cu(II) binding to biochar DOM: Evidence from C K-edge NEXAFS and EEM-PARAFAC combined with two-dimensional correlation analysis

Wei, Jing; Yuan, Guodong; Zhou, Yongqiang; Wang, Hailong; Lü, Jian

doi:10.1016/j.scitotenv.2019.134919

Cited by 61 publications

(11 citation statements)

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“…Proteinlike substances were representative of the biodegradable and humiclike substances and can be referred to as non-biodegradable components [ 46 ]. Similar studies found that the order of changes in the three components’ different feedstocks with increasing pyrolysis temperatures was proteinlike=humic acid → fulvic acid for chicken biochar, and fulvic acid → humic acid → proteinlike for dairy manure biochar [ 44 ]. Baken et al [ 47 ] indicated that with changes in the pyrolysis temperature, humiclike substances responded faster than proteinlike substances because of the higher aromaticity of the former.…”

Section: Resultsmentioning

confidence: 86%

“…2D-COS analysis helps to enhance the deconvolution of overlapping peaks and provides information on the heterogeneous distribution of PA-derived DOM with the pyrolysis temperature as an external perturbation [ 44 ]. The synchronous fluorescence spectra of PA in the 200–600 nm region ( Figure 3 A) exhibited three predominant autopeaks at 450, 420, 380, and 360 nm with a small peak at 320 nm identified from the cross-peaks.…”

Section: Resultsmentioning

confidence: 99%

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Effect of Pyrolysis Temperature on the Characterisation of Dissolved Organic Matter from Pyroligneous Acid

et al. 2021

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Dissolved organic matter (DOM) greatly influences the transformation of nutrients and pollutants in the environment. To investigate the effects of pyrolysis temperatures on the composition and evolution of pyroligneous acid (PA)-derived DOM, DOM solutions extracted from a series of PA derived from eucalyptus at five pyrolysis temperature ranges (240–420 °C) were analysed with Fourier transform infrared spectroscopy, gas chromatography–mass spectroscopy, and fluorescence spectroscopy. Results showed that the dissolved organic carbon content sharply increased (p < 0.05) with an increase in pyrolysis temperature. Analysis of the dissolved organic matter composition showed that humic-acid-like substances (71.34–100%) dominated and other fluorescent components (i.e., fulvic-acid-like, soluble microbial by-products, and proteinlike substances) disappeared at high temperatures (>370 °C). The results of two-dimensional correlation spectroscopic analysis suggested that with increasing pyrolysis temperatures, the humic-acid-like substances became more sensitive than other fluorescent components. This study provides valuable information on the characteristic evolution of PA-derived DOM.

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Section: Resultsmentioning

confidence: 86%

Section: Resultsmentioning

confidence: 99%

Effect of Pyrolysis Temperature on the Characterisation of Dissolved Organic Matter from Pyroligneous Acid

et al. 2021

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“…The various peaks for Mnt are still discernible in the spectrum of CMnt, but their intensities are significantly reduced. The FTIR spectra of both 0.5C and CMnt show peaks due to CH 3 and CH 2 bending (2790 and 2860 cm −1 ), carbonyl C=O in quinone, ester, or carboxyl (1700 cm −1 ), C-O stretching in hydroxyl, ester, or ether (1460-1000 cm −1 ), and aromatic C-Hout-of-plane bending (900-750 cm −1 ) (Wei et al, 2020). The intensity of these peaks increases with the concentration of glucose added, reflecting the enhanced formation of hydrochar-montmorillonite nanocomposites.…”

Section: Mechanisms Involved In the Formation Of Hydrochar-montmorillonite Nanocompositesmentioning

confidence: 99%

Montmorillonite-Hydrochar Nanocomposites as Examples of Clay–Organic Interactions Delivering Ecosystem Services

Yuan

Wei

Theng

2021

Clays and clay miner.

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Clay-organic interaction is an important natural process that underpins soil ecosystem services. This process can also be tailored to produce clay-organic nanocomposites for industrial and environmental applications. The organic moiety of the nanocomposites, typically represented by a toxic surfactant, could be replaced by hydrochar formed from biomolecules (e.g. glucose) via hydrothermal carbonization. The effect of montmorillonite (Mnt) and glucose dosage on hydrochar formation, however, has not been clarified. In addition, the mechanisms by which Mnt-hydrochar nanocomposites (CMnt) can detoxify and remove carcinogenic Cr(VI) from aqueous solution are not well understood. In the current study, research milestones in terms of clay-organic interactions are summarized, following which the synthesis and characterization of CMnt for Cr(VI) adsorption are outlined. Briefly, 1 g of Mnt was reacted with 75 mL of glucose solution (0.1, 0.2, 0.3, 0.4, 0.5, and 0.6 mol L −1 ) by hydrothermal carbonization at 200°C for 16 h. The resultant CMnt samples were analyzed for chemical composition, functional groups, morphological features, and Cr(VI) adsorptive properties. Mnt promoted the conversion of glucose to hydrochars, the particle size of which (~80 nm) was appreciably smaller than that formed in the absence of Mnt (control). Furthermore, the hydrochars in CMnt had an aromatic structure with low hydrogen substitution and high stability (C/H atomic ratio 0.34-0.99). The weakened OH (from hydrochar) and Si-O-Si stretching peaks in the Fouriertransform infrared (FTIR) spectra of CMnt are indicative of chemical bonding between Mnt and hydrochar. The CMnt samples were effective at removing toxic Cr(VI) from acidic aqueous solutions. Several processes were involved, including direct reduction of Cr(VI) to Cr(III), complexation of Cr(III) with carboxyl and phenolic groups of hydrochar, electrostatic attraction between Cr(VI) and positively charged CMnt at pH 2 followed by indirect reduction of Cr(VI) to Cr(III), and Cr(III) precipitation.

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“…[5][6][7][8][9][10][11][12][13][14][15][16][17] In the field of environmental chemistry, the use of PARAFAC for the analysis of untreated samples measured with fluorescence spectroscopy is largely and successfully applied for characterizing organic matter in water systems. [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34] Such good results reported in the literature pave the way for the possibility of extending the use of this approach to reach a deeper understanding of the nature of any fluorophore directly in the sample: the use of frontface fluorescence, combined with three-way analysis of the data, seems an easier and faster choice, which could be applied as an alternative to long and tedious lab procedures in many fields of research. In particular, this approach could be extended to aim at a deeper characterization of the chemical and physico-chemical changes of different components in a complex sample.…”

Section: Introductionmentioning

confidence: 98%

“…In particular, in the field of food science, it has been used to characterize foods that have undergone industrial processes and subjected to different storage conditions or for traceability of protected designation of origin products 5–17 . In the field of environmental chemistry, the use of PARAFAC for the analysis of untreated samples measured with fluorescence spectroscopy is largely and successfully applied for characterizing organic matter in water systems 18–34 . Such good results reported in the literature pave the way for the possibility of extending the use of this approach to reach a deeper understanding of the nature of any fluorophore directly in the sample: the use of front‐face fluorescence, combined with three‐way analysis of the data, seems an easier and faster choice, which could be applied as an alternative to long and tedious lab procedures in many fields of research.…”

Section: Introductionmentioning

confidence: 99%

Investigating challenges with scattering and inner filter effects in front‐face fluorescence by PARAFAC

Bevilacqua

Rinnan

Lund

2020

Journal of Chemometrics

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The use of front‐face fluorescence spectroscopy, and three‐way chemometric analysis (like PARAllel FACtor analysis, PARAFAC), has been successfully applied for the analysis of unpretreated samples in the fields of food and environmental analysis. It would be desirable to evaluate the potential of this approach for the analysis of any real sample in any field of research. Even in the simplest of the real samples acquired with front‐face, the presence of scattering and inner filter effects will occur, potentially hampering the subsequent data analysis due to deviations from Beer‐Lambert's law. This paper addresses these concerns in practice, proposing a strategy of spectral preprocessing to mitigate these effects. This is done by measuring several data sets with different levels of scattering and inner filter effects by fluorescence in excitation‐emission mode. The results show that the occurrence of these interferents (sometimes neglected with front‐face mode) affects the fluorescence signal and interferes with any traditional analysis on these data, as much as they hamper the successful use of methods like PARAFAC. The proposed preprocessing strategy is based on one of the most traditional correction for the inner filter effect with right‐angle mode. However, we suggest applying a tunable factor, b, that will account for the degree of deviation from linearity between concentration of a given analyte and its fluorescence signal. It is demonstrated that by choosing a proper b‐value, this correction helps in finding an acceptable solution for the PARAFAC algorithm, in line with Beer‐Lambert's law.

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Limited Cu(II) binding to biochar DOM: Evidence from C K-edge NEXAFS and EEM-PARAFAC combined with two-dimensional correlation analysis

Cited by 61 publications

References 65 publications

Effect of Pyrolysis Temperature on the Characterisation of Dissolved Organic Matter from Pyroligneous Acid

Effect of Pyrolysis Temperature on the Characterisation of Dissolved Organic Matter from Pyroligneous Acid

Montmorillonite-Hydrochar Nanocomposites as Examples of Clay–Organic Interactions Delivering Ecosystem Services

Investigating challenges with scattering and inner filter effects in front‐face fluorescence by PARAFAC

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