Fabrication of carboxymethyl-functionalized porous ramie microspheres as effective adsorbents for the removal of cadmium ions

Peng, Xiongyi; Su, Siwei; Xia, Minggui; Lou, Kankan; Yang, Feng; Peng, Shuai; Cai, Yingjie

doi:10.1007/s10570-018-1656-z

Cited by 17 publications

(4 citation statements)

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“…The increase of C3 may be ascribed to the oxidation of active oxygen-containing groups induced by pretreatment, especially MAMS pretreatment. The O 1 s spectra were curve fitted into O1 (C=O) and O2 (C–OH, C–O–C) [42], showing that the fraction of O1 increased with that of C3, and the fraction of O2 which further confirmed the generation of aldehyde or carboxyl groups (C=O/O=C–O) induced by the oxidation of active oxygen-containing groups during the process of pretreatment. Therefore, MA and MAMS pretreatments evidently affected the surface chemical bonding, contributing to the changes in the structural characteristics of SCB, which could help to promote its enzymatic conversion.…”

Section: Resultsmentioning

confidence: 99%

“…The increase of C3 could be ascribed to the oxidation of oxygen-containing groups induced by pretreatment, especially MAMS pretreatment, which was in good agreement with FTIR analysis. The O 1 s spectra were deconvoluted into two peaks [42], and the fraction of O1 (C=O) increased with that of C3. The fraction of O2 (C–OH, C–O–C) decreased, which further confirmed the oxidation of O2 to O1 during pretreatment, especially MA + AlCl 3 pretreatment.…”

Section: Resultsmentioning

confidence: 99%

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Overcoming biomass recalcitrance by synergistic pretreatment of mechanical activation and metal salt for enhancing enzymatic conversion of lignocellulose

Zhang

Huang

et al. 2019

Biotechnol Biofuels

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BackgroundDue to biomass recalcitrance, including complexity of lignocellulosic matrix, crystallinity of cellulose, and inhibition of lignin, the bioconversion of lignocellulosic biomass is difficult and inefficient. The aim of this study is to investigate an effective and green pretreatment method for overcoming biomass recalcitrance of lignocellulose.ResultsAn effective mechanical activation (MA) + metal salt (MAMS) technology was applied to pretreat sugarcane bagasse (SCB), a typical kind of lignocellulosic biomass, in a stirring ball mill. Chlorides and nitrates of Al and Fe showed better synergistic effect with MA, especially AlCl3, ascribing to the interaction between metal salt and oxygen-containing groups induced by MA. Comparative studies showed that MAMS pretreatment effectively changed the recalcitrant structural characteristics of lignocellulosic matrix and reduced the inhibitory action of lignin on enzymatic conversion of SCB. The increase in hydroxyl and carboxyl groups of lignin induced by MAMS pretreatment led to the increase of its hydrophilicity, which could weaken the binding force between cellulase and lignin and reduce the nonproductive binding of cellulase enzymes to lignin.ConclusionsMAMS pretreatment significantly enhanced the enzymatic digestibility of polysaccharides substrate by overcoming biomass recalcitrance without the removal of lignin from enzymatic hydrolysis system.Electronic supplementary materialThe online version of this article (10.1186/s13068-019-1354-6) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Overcoming biomass recalcitrance by synergistic pretreatment of mechanical activation and metal salt for enhancing enzymatic conversion of lignocellulose

Zhang

Huang

et al. 2019

Biotechnol Biofuels

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“…The free phenolic hydroxyls and the −NH⋯OH− structure that formed on the SP-TAPI under higher pH conditions thus generated a strong electrostatic attraction with Cd(II) in the reaction system [7]. Crucially, this demonstrated that the Cd(II) adsorption capacity significantly decreased at pH ≥7.0, resulting from the formation of metal-hydrolyzed species such as soluble Cd(OH)+ and colloidal precipitate Cd (OH) 2 , to restrain complex formation [44,45]. Herein, the influence of the pH on the Cd(II) removal percentage further confirmed that electrostatic attraction played an important role in the adsorption process.…”

Section: Resultsmentioning

confidence: 99%

A Simple Low-Cost Method to Prepare Lignocellulose-Based Composites for Efficient Removal of Cd(II) from Wastewater

Wen

Zhang

et al. 2019

Polymers

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The fabrication of functional lignocellulose-based materials has drawn considerable attention because it acts as a green separation/absorption material owing to its multi-porous mesostructure. In this study, a surface functionalized lignocellulose-based adsorbent for the highly efficient capture of Cd(II) ions was prepared through facile in situ co-deposition of wood waste-derived saw powder (SP) in the presence of tannic acid (TA) and aminopropyltriethoxysilane (APTES) mixed aqueous solution. The SP was first modified using TA-APTES coating to synthesize the functional SP substrate (SP-(TA-APTES)). The SP-(TA-APTES) hybrids served as reactive platforms, which enabled further decoration with amino-rich polyethylenimine (PEI) due to the outstanding secondary reactions of the TA-APTES layer. The surface morphology of the resulting SP-(TA-APTES)-PEI (SP-TAPI) composites were investigated using Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). Significantly, the combined advantages of the lignocellulosic skeleton, the layer-particle structure, and the hybrid coating contributed to the enhanced adsorption capacity of Cd(II) (up to 22.66 mg/g at pH = 5.0). This removal capacity was higher than that of most reported agricultural waste-based or lignocellulose-based materials. The Cd(II) adsorption mechanism of the surface-modified SP-TAPI composites was studied in detail. These results provide new insights into the high value-added utilization of agricultural waste for water purification applications.

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“…Phytoextraction has been promoted as an environmentally-friendly, low-input alternative for remediation of soil contaminated with heavy metals [7][8][9][10]. Recently, plant species used for phytoremediation have been extended from hyperacuumulators to non-hyperaccumulators such as Brassica napus [11], Solanum nigrum [12], Boehmeria nivea [13] and Helianthus annuus [14], which have significantly higher growth rates and biomass than hyperaccumulators. However, the use of these species is often limited by low levels of heavy metal accumulation related to their lower tolerance to heavy metals.…”

Section: Introductionmentioning

confidence: 99%

A MYB transcription factor, BnMYB2, cloned from ramie (Boehmeria nivea) is involved in cadmium tolerance and accumulation

et al. 2020

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MYB-related transcription factors play important roles in plant development and response to various environmental stresses. In the present study, a novel MYB gene, designated as BnMYB2 (GenBank accession number: MF741319.1), was isolated from Boehmeria nivea using rapid amplification of cDNA ends (RACE) and RT-PCR on a sequence fragment from a ramie transcriptome. BnMYB2 has a 945 bp open reading frame encoding a 314 amino acid protein that contains a DNA-binding domain and shares high sequence identity with MYB proteins from other plant species. The BnMYB2 promoter contains several putative cis-acting elements involved in stress or phytohormone responses. A translational fusion of BnMYB2 with enhanced green fluorescent protein (eGFP) showed nuclear and cytosolic subcellular localization. Real-time PCR results indicated that BnMYB2 expression was induced by Cadmium (Cd) stress. Overexpression of BnMYB2 in Arabidopsis thaliana resulted in a significant increase of Cd tolerance and accumulation. Thus, BnMYB2 positively regulated Cd tolerance and accumulation in Arabidopsis, and could be used to enhance the efficiency of Cd removal with plants.

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Fabrication of carboxymethyl-functionalized porous ramie microspheres as effective adsorbents for the removal of cadmium ions

Cited by 17 publications

References 50 publications

Overcoming biomass recalcitrance by synergistic pretreatment of mechanical activation and metal salt for enhancing enzymatic conversion of lignocellulose

Overcoming biomass recalcitrance by synergistic pretreatment of mechanical activation and metal salt for enhancing enzymatic conversion of lignocellulose

A Simple Low-Cost Method to Prepare Lignocellulose-Based Composites for Efficient Removal of Cd(II) from Wastewater

A MYB transcription factor, BnMYB2, cloned from ramie (Boehmeria nivea) is involved in cadmium tolerance and accumulation

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