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June 2012 - November 2014
June 2012 - November 2014
Publications
Publications (118)
The scientific community is pursuing significant efforts worldwide to develop environmentally viable film materials from biomass, particularly transparent, high‐performance regenerated cellulose (RC) films, to replace traditional plastics. However, the inferior mechanical performance and hydrophilic nature of RC films are generally not suitable for...
In this study, the Cadmium sulfide composite reduced graphene oxide photocatalyst (CdS/xrGO) was successfully synthesized to enhance the conversion of photocatalytic oxidation of 5-hydroxymethylfurfural (HMF). The conversion of 5-hydroxymethylfurfural and the yield of 2.5-diformylfurans (DFF) were 71.18 % and 69.72 %, respectively under optimum con...
In the present work, hollow and solid lignin nanoparticles (LNPs) were synthesized through a self-assembling process using the organosolv pretreatment of lignin from the eucalyptus and willow byproducts. The SEM, TEM, and zeta potential establish the LNPs of a uniform spherical morphology, and the hollow lignin nano-particles (HLNPs) display the in...
Chitosan modified AGQD (amine modified graphene oxide quantum dots) and then combined with H3PW12O40 to obtain CSx@AGQD-HPW12 via facile process and applied for CIP removal through pre-adsorption and photocatalytic processes. The application of chitosan could regulate the morphology and photoelectric properties effectively. CS0.5@AGQD-HPW12 was fou...
Multifunctional hydrogels, particularly with superior mechanical properties and using green/sustainable approaches, have attracted increasing attention because of their many applications and consistency with the green chemistry principle; unfortunately, their effective fabrication process is challenging. In this work, inspired by unique functions i...
Efficient pretreatment to decrease the recalcitrance of lignocellulosic biomass is considered to be an essential precondition for lignocellulosic valorization. In this study, the heteropoly acids (i.e., phosphotungstic acid, silicotungstic acid and phosphomolybdic acid) assisted sulfolane organosolv pretreatment was developed to reduce the recalcit...
The size of silver nanoparticles (Ag NPs) and loading amount of Ag NPs onto their substrate/carrier are two key factors for their efficient applications. Herein, we present a facile method for in situ synthesizing ultrafine and highly loaded Ag NPs on the surface of tannin-coated catechol-formaldehyde resin (TA-CFR) nanospheres. TA-CFR nanospheres...
Conductive hydrogels have attracted tremendous attention as a novel generation of wearable devices and body monitoring due to their great stretchability and high flexibility. Here, a multifunctional cellulose nanocrystal @sodium lignosulfonate-silver-poly(acrylamide) nanocomposite hydrogel was prepared by radical polymerization within only a few mi...
Replacing petrochemical polymers with biomaterials for biodegradable mulch applications has attracted widespread attention. However, improving film performance and reducing costs remain an issue. In this work, we found that the synergistic effect of sodium alginate and quaternary lignin significantly improved the performance and reduced the cost of...
The efficient conversion of biomass resources has become one of the important topics of current research as the current chemical economy is shifting towards the increasing utilization of renewable feedstocks. In this work, a newly integrated strategy was developed as supercritical CO2/ethanol/water ternary green system for simultaneous production o...
Lignin shows good potential as a flocculant material, but more complex reaction processes are often required to obtain products with high flocculation performance. In this work, kraft lignin, acrylamide, and 3-chloro-2-hydroxypropyltrimethylammonium chloride were used as materials to prepare lignin-based flocculants (CPKL) using a one-pot method. T...
The construction of lignin nanoparticles (LNPs) with both lignin properties and nanomaterial properties through controlling the morphologies and structures of lignin is one of the effective ways to realize its application in the field of biomedicine. Firstly, the morphology and chemical structure of LNPs were studied in detailed. The results showed...
Biomass as a green renewable energy source has the potential to become a significant energy source in the future due to the depletion of fossil fuels. Herein, carbon dioxide was employed to enhance the acidic pretreatment of corn cobs with lithium bromide trihydrate (LBTH) system to extract low molecular weight lignin with high antioxidant activity...
This study aimed to separate fractionated lignin (L2) containing more hydroxyl and carboxyl groups from black liquor by simple sequential acid precipitation, and then L2 was introduced to the surface of magnetic Fe3O4 nanoparticles (MNPs) to prepare high-efficiency and low-cost fractionated lignin-based magnetic nanoparticles (L2-MNPs) adsorbent. T...
The photocatalytic performance of common photocatalysts is limited by their low surface area, insufficient absorption of light energy, and fast photogenerated electron-hole recombination rate. The introduction of Z-scheme photocatalysts decorated with hexagonal boron nitride (h-BN) has already been confirmed to be an effective way to extend the sur...
A novel and effective green system consisting of deep eutectic solvent (DES) was proposed to prepare lignin nanoparticles (LNPs) without any lignin modification. The LNPs are obtained through the dialysis of the kraft lignin-DES solution. The particle size distribution, Zeta potential and morphology of the LNPs are characterized by using dynamic li...
Multifunctional hydrogels have drawn much attention as functionalized materials, and the composites hydrogel concept is an effective approach to fabricate hydrogels that simultaneously possess multiple functions, such as long-lasting adhesiveness, toughness, excellent self-healing, conducting, ultraviolet-blocking and antibacterial properties. In t...
Microwave-assisted guanidine hydrochloride deep eutectic solvents (DESs) was developed for rapid and efficient pretreatment of castor stalk. The DES synthesized with guanidine hydrochloride and lactic acid showed a better delignification (92.02%) and enzymatic saccharification yield (96.3%) than choline chloride and lactic acid DES resulted. In add...
In this study, magnetic solid acid Fe3O4/C–SO3H600 was synthesized and applied in catalytic fast pyrolysis of cellulose for the selective production of levoglucosenone (LGO). The catalytic pyrolysis of cellulose could not only reduce the reaction-required temperature and promote the LGO production, but also could be reused for recycling in an econo...
In this study, the effect of calcification on methanogenic activity, basic properties, microbial community structure, and microstructure of anaerobic granular sludge (AnGS) was investigated. Results indicated that inorganic crystals were deposited in the sludge in the form of calcite, which increased sludge density and led them to deposit at the bo...
A green and simple lignin nanoparticles (LNPs) production strategy was developed using deep eutectic solvents (DES). The LNPs were formed with corncob alkali lignin by sequential DES dissolution and self-assembling process. Uniform size and spherical shape of LNPs were observed by scanning electron microscopy (SEM), transmission electron microscopy...
In this work, a sulfonic acid-functionalized magnetic separable solid acid (Fe3O4@SiO2-SO3H) was synthesized, characterized, and tested for fructose conversion to 5-hydroxymethylfurfural (HMF). Results indicated that the prepared catalyst had a good efficacy for fructose dehydration to HMF due to its larger specific surface area, appropriate acid a...
The invention is in the technical fields of biomass resources utilization and preparation of electrode materials, and involves a method of preparing carbon supported transition metal sulfide electrode materials, especially a preparing method using bio-oil derived from biomass as carbon source. Typically, the sulfate solution is firstly prepared via...
This invention belongs to the technical fields of biomass resource utilization and catalyst preparation, and involves a method of preparing carbon supported transition metal catalysts, especially a method of preparing carbon supported transition metal catalysts for hydrogenation from bio-oil. Typically, the nitrate (nickel nitrate, cobalt nitrate o...
Herein, efficient exploitation of biomass with diluted alkali-aided methanol organosolv treatment has been proposed. The ultrahigh glucose yield and high value-added lignin from xylose residue were simultaneously achieved via the mild alkali catalytic organosolv treatment and enzymatic hydrolysis. The NaOH-aided methanol pretreatment resulted in a...
As the traditional anode material of lithium-ion batteries, tin dioxide (SnO2) has the characteristics of a high theoretical capacity and stable crystal structure. However, the alloying/de-alloying reaction between tin and lithium ions causes volume expansion and continuously generates an SEI film, which causes the electrode to fall off the current...
Using reed (Phragmites australis (Cav.) Trin. ex Steud) as raw material, straw pulp was prepared by low alkali (less than 6%) pretreatment combined with mechanical grinding. The effects of pretreatment times and alkali dosages on pulp properties and pretreatment solution were investigated. The results demonstrated that alkali pretreatment affected...
Lignin nanomaterials have wide application prospects in the fields of cosmetics delivery, energy storage, and environmental governance. In this study, we developed a simple and sustainable synthesis approach to produce uniform lignin nanoparticles (LNPs) by dissolving industrial lignin in deep eutectic solvents (DESs) followed by a self-assembling...
To investigate high phenolic lignin extraction process, deep eutectic solvents based on oxalic acid and glycerol as hydrogen bond donor were first prepared and analyzed. Two different types of deep eutectic solvent lignin and ethanol lignin were extracted by using a high-pressure autoclave at different temperatures and times, and then the obtained...
Lignin is the most abundant renewable aromatic polymer in nature, which complex structure and compact connection with cellulose and hemicellulose through covalent bond and hydrogen bond make it difficult to be separated efficiently. Deep eutectic solvents (DES) is a novel kind of green ionic liquid, which has been successfully applied to lignin iso...
In this study, alkaline catalyst (NaOH)-aided sulfolane organosolv pretreatment was firstly developed to reduce the recalcitrance of willow (Salix matsudana cv. Zhuliu) for effective saccharification and lignin valorization in the subsequent processes. The pretreatment notably removed lignin, minimized cellulose loss and increased the accessibility...
In order to improve the physical properties and brightness of poplar chemi-mechanical pulp, a new staged alkali and hydrogen peroxide treatment method was proposed and applied. Wood chips were impregnated and swelled with an alkali solution and then treated with a hydrogen peroxide bleaching liquor. A thorough evaluation and comparison of the physi...
Xylose residue (XR), after diluted acid treatment of corncob, consists of cellulose and lignin. However, structural changes of XR lignin have not been investigated comprehensively, and this has seriously hindered the efficient utilization of lignin. In this study, corncob milled wood lignin (CC MWL), and xylose residue milled wood lignin (XR MWL) w...
In the present examination, the thermochemical behavior of the lignin extracted from willow (Salix matsudana cv. Zhuliu) by deep eutectic solvents (DES) treatment (DES-lignin) with varied times were investigated with the techniques of thermogravimetric analyzer, in situ diffuse reflectance infrared pyrolysis (in situ-FTIR), and pyrolysis–gas chroma...
Levulinic acid (LA) production from corncob acid hydrolysis residues (CAHR) using FeCl3 as Lewis acid catalyst in green solutions of salt was investigated. The reaction kinetic relationships were determined in the temperature range of 160–180 °C, with FeCl3 concentrations of 0.12–0.36 M, and a reaction time of 0–60 min. The maximum LA concentration...
Purity, morphology, and structural characterization of synthesized deep eutectic solvent (DES)-lignins (D6h, D9h, D12h, D18h, D24h) extracted from willow (Salix matsudana cv. Zhuliu) after treatment with a 1:10 molar ratio of choline chloride and lactic acid at 120 °C for 6, 9, 12, 18, and 24 h were carried out. The purity of DES-lignin was ~95.4%....
Lignins isolated from native Pennisetum sinese Roxb. (P. sinese) and black liquor from kraft and soda-AQ pulping processes were characterized and compared by the analysis of alkaline nitrobenzene oxidation/HPLC, FT-IR, 31 P-NMR and 2D-HSQC NMR. The purpose was to distinguish lignins' structural differences and explore the mechanisms in the pulping...
An efficient pretreatment with various concentrations of FeCl3 (0.005-0.2 mol/L) was developed to extract hemicellulose in sugarcane bagasse and enhance the enzymatic hydrolysis of cellulose in pretreated solids. It was found that 0.025 mol/L FeCl3 pretreated substrate yielded a high glucose yield of 80.1% during enzymatic hydrolysis. Then the char...
Fast pyrolysis is a promising method that is being investigated for application in the degradation of lignin into phenolic chemicals. In this study, enzymatic/mild acidolysis lignin (EMAL) isolated from eucalyptus (E-EMAL) and wheat straw (W-EMAL) were characterized by pyrolysis-gas chromatography/mass spectrometry. The results showed that the comp...
A new functional biopolymer was synthesized through an ionic liquid-mediated homogeneous grafting of cinnamic anhydride to xylans. The ionic liquid used was 1-allyl-3-methylimidazolium chloride (AMIMCl) ionic liquid. Xylans with degrees of substitution (DS) between 0.11 and 0.57 were accessible in a completely homogeneous system by changing catalys...
Alkaline oxidative cracking with molecular oxygen was demonstrated as an effective method to depolymerize lignin under moderate conditions. Ammonia-extracted lignin from corn stover was depolymerized to aromatics and organic acids by the alkaline oxidation. The identified products by GC-MS, NMR, and HPLC included mono-aromatic compounds (such as va...
The objectives of this study were to generate fermentable xylose by sulfuric acid hydrolysis of wheat straw and investigate the effect of hemicellulose removal on the physical and chemical properties of the unhydrolyzed solid residue (USR). Different reaction conditions, including concentration of sulfuric acid (COS), temperature, and time, were te...
Lignin is a superb renewable feedstock for deriving petroleum-analogous biochemicals and value-added bioproducts. However, proper elucidation of its original biosynthetic structure and subsequent deconstruction is necessary to facilitate proper exploitation. Herein, its chemical substructure and linkages within an important global feedstock, rice s...
Deep eutectic solvents (DESs) are a potentially high-value lignin extraction methodology. DESs prepared from choline chloride (ChCl) and three hydrogen-bond donors (HBD)—lactic acid (Lac), glycerol, and urea—were evaluated for isolation of willow (Salix matsudana cv. Zhuliu) lignin. DESs types, mole ratio of ChCl to HBD, extraction temperature, and...
Holocellulose obtained by dewaxing and delignification of corn stalks were sequentially extracted and fractionated with different solvent systems to separate hemicelluloses. The chemical structures of the separated hemicelluloses were characterized. The results showed that the obtained hemicelluloses yields were 5.8%, 0.3%, 24.4%, 38.6%, 7.1% and 1...
The objectives of this study were to generate fermentable xylose by sulfuric acid hydrolysis of wheat straw and investigate the effect of hemicellulose removal on the physical and chemical properties of the unhydrolyzed solid residue (USR). Different reaction conditions, including concentration of sulfuric acid (COS), temperature, and time, were te...
Fractionation of lignocellulosic components is a prerequisite for maximizing valorization of plant biomass in an integrated biorefinery. In this study, microwave-assisted H2O2-NaOH extraction was developed for fractionation of Pennisetum sinese Roxb. (P. sinese), a highly productive energy crop. Different reaction conditions including solid-liquid...
The effects of molecular weight on the pyrolysis products properties of alkali lignin were investigated by using thermogravimetric analyzer coupled with Fourier transform infrared spectrometry (TG-FTIR) and tube furnace. Four lignin samples, including pure alkali lignin (AL), more than 10 kDa lignin fraction (AL-10kDa), 5–10 kDa lignin fraction (AL...
Valorization of lignin to value-added products is crucial to support the economic feasibility and sustainability of biofuel production from renewable resources. Although pyrolysis of lignin has been studied for decades, detailed pyrolysis mechanisms are not well understood based on true lignins due to the complex structural heterogeneity of lignin....
A synthetic method for obtaining a lignin model compound of β-O-4 structure, guaiacyl glycerol-β-guaiacyl ether, was researched through five reaction steps from guaiacol. The key step of this synthetic method was the condensation reaction between 4-(α-bromoacetyl)-guaiacol (III) and guaiacol (I). The compounds were characterized by ¹H nuclear magne...
The use of supercritical water for the decomposition of lignin and evaluation of its influence on lignin decomposition and conversion to various products was the thrust of the current study. Poplar alkali lignin (AL), corncob-to-xylitol residue lignin (XRL), and cornstalk-to-ethanol residue lignin (ERL) were the lignin species studied because they...
A process for the production of high-value-added phenolics following hydrothermal depolymerization of black liquor lignins after acidification without catalysis was successfully deployed and is described herein. A high yield of liquid products up to 33.3 mg/mL (based on raw black liquor) was recovered at 290 °C, 30 min, and pH 6; meanwhile, only 12...
