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Binpeng Zhang,Dongjie Yang,Xueqing Qiu,Yong Qian,Mengzhen Yan,Qiong Li 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
In this work, lignin-derived porous carbon was prepared using alkali lignin (AL) or lignosulfonic acid (LS)as a precursor to reveal the activation effects of potassium compound (KHCO3, K2CO3 and KOH) ontechnical lignin with different degree of aggregation. Quartz crystal microbalance with dissipation andatomic force microscope testing results showed that KHCO3 had the best activation effect on AL having ahighly aggregated and dense microstructure, thanks to the expansion effect from KHCO3. LS has a highlydispersed and loose microstructure, and KOH had the best activation effect on LS. This is because thestabilizing effect from KOH could avoid excessive destruction of pore structure during carbonization andactivation process. Therefore, the specific surface area of AL-derived porous carbon obtained with KHCO3and LS-derived porous carbon obtained with KOH could reach 2084 and 2770 m2 g 1, while theabsorption capacity could reach 701 and 870 mg g 1 for sulfamethazine respectively. Our result providesa theoretical base for preparing high quality lignin-derived porous carbon adsorbent with different kindsof technical lignin
Investigation of grafted sulfonated alkali lignin polymer as dispersant in coal-water slurry
Yanlin Qin,Dongjie Yang,Wenyuan Guo,Xueqing Qiu 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.27 No.-
A novel grafted sulfonated alkali lignin polymers (GSAL) with hydrophilic side chain and differentmolecular weights prepared were used as dispersants for coal-water slurry (CWS). The viscosityreduction for CWS had been attributed primarily to the diminution of coal particles (adsorbed GSAL)interaction of steric electrostatic repulsion and dramatic wettability. The adsorption amount of GSAL-3can reach to 1.58 mg/g, and the isotherm of GSAL on coal surface belongs to the Langmuir model, theelectrostatic self-assembly result indicated the dominant driving force of GSAL absorbed on coal surfacewas the p–p interaction. GSAL was superior in reducing the viscosities of CWS.
Adsorption of different molecular weight lignosulfonates on dimethomorph powder in an aqueous system
Zhili Li,Yuxia Pang,Yuanyuan Ge,Xueqing Qiu 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.1
Different molecular weight lignosulfonates were acquired by ultrafiltration and their adsorption behavior on dimethomorph powder were investigated. The results showed that as the molecular weight of lignosulfonates increased the adsorption amounts increased and the adsorption processes were driven by van der Waals forces and hydrophobic effects. The adsorption isotherms were fitted well by Langmuir model. Relations of adsorption amounts and zeta potentials with particle size of dimethomorph particles were established to disclose the dispersing mechanism of dimethomorph suspensions. The average particle sizes were determined by zeta potentials rather than adsorption amounts, which confirmed the dispersing mechanisms were electrostatic repulsive forces.
( Xiaojing Fan ),( Ruixian Yang ),( Sixin Qiu ),( Xueqing Cai ),( Huasong Zou ),( Fangping Hu ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.5
The eglS gene in Bacillus amyloliquefaciens encodes an endo-β-1,4-glucanase that belongs to glycosyl hydrolase family 5. In this study, a disruption mutant of gene eglS was constructed to examine its role in bacterial adaptation in plants. The mutant TB2k, eglS gene inactivated bacterial strain, was remarkably impaired in extracellular cellulase activity. When inoculated on Brassica campestris, the TB2k population was reduced by more than 60% compared with the wild-type strain in the root, stem, and leaf tissues. Overexpression of eglS in the wild-type strain increased the bacteria population in the plant tissues. Further studies revealed that the transcription level of eglS was correlated with bacterial population. These data demonstrate that endo-β-1,4-glucanase of B. amyloliquefaciens is required for its optimal endophytic colonization.
Shaoqu Xie,Wenli Song,Conghua Yi,Xueqing Qiu 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.56 No.-
The salting-out extraction systems of ethanol and water induced by the high-solubility inorganicelectrolytes were investigated at 25 C. More than 99.90% of ethanol was salted out into the organicphase. The salt content of the organic phase is only about 0.01 wt%, which is negligible for the applicationof the ethanol–salt salting-out extraction. More than 90% of water can be retained in the aqueous phase. Itis concluded that the salting-out effects of four salting-out agents on the aqueous solution of ethanol areordered in the sequence: K4P2O7> K3PO4> K2HPO4> K2CO3.
Binpeng Zhang,Dongjie Yang,Wensheng Lin,Huan Wang,Yong Qian,Xueqing Qiu 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.97 No.-
Alkali lignin (AL), an industrial waste from pulping black liquor, is mainly applied as a low-gradecombustible energy source. Design and preparation of high value-added materials with AL is still achallenge. In this work, wefirstly introduced ammonium group into AL and prepared quaternized alkalilignin (QAL) for improving the solubility in acidic aqueous solution. Then a facile sol–gel andcarbonization process was developed to fabricate lignin-derived carbon/TiO2 (LC/TiO2) compositephotocatalyst using QAL as the carbon precursor. The microstructural characteristics and optical propertyof the LC/TiO2 composite were systematically characterized. Composite exhibited a “brick (TiO2nanoparticles) and mortar (LC)”-type construction, and TiO2 nanoparticles were coated with LC. Theintroduction of LC endowed TiO2 with extended photoabsorption region and enhanced separation ofphoto-generated charge carriers. LC/TiO2 obtained at a carbonization temperature of 650 C presentedthe highest photocatalytic activity for the degradation of organic dye, which was about 3.4 times that ofbare TiO2. Moreover, LC/TiO2 also presented good recyclability. This facile strategy not only offers greatopportunities for the high value-added application of industrial lignin, but also promotes the practicalapplication of TiO2 photocatalyst.
Xiao-Kang Li,Da-Feng Zheng,Tao Zheng,Xu-Liang Lin,Hong-ming Lou,Xueqing Qiu 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.49 No.-
The dispersion ability of polycarboxylate ether (PCE) in fresh concrete is much impeded by clayimpurities. To improve the dispersion of PCE in the clay-contained concrete, lignin-based polyoxy-ethylene ether (PEG-grafted-lignin) was synthesized through polyethylene glycol (PEG) grafted to kraftlignin (KL). The results showed that PEG-grafted-lignin increased thefluidity of MMT-contained cementpaste when combined with PCE. It improved the rheological properties of MMT-contained cement pasteby reducing the yield stress and the rheological behavior index. The adsorption of PEG-grafted-lignin onMMT was more quickly than KL and the equilibrium adsorption amount was 31.43 mg/g at an initialconcentration of 100 mg/L. XRD revealed that PEG-grafted-lignin had inserted into the interlayerstructure of MMT, while DLS disclosed the spatial effect of PEG-grafted-lignin was much stronger thanPCE. This study put forward a new method in the anti-sludge study of PCE.