Waste and Biomass Valorization
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2018
·Vol. 10
·期 11
·3343-3350
·
IF 1.874
Chen Cheng,Jiang Linfeng,Ma Guanfeng,Jin Dongxue,Zhao Lisha,Ouyang Xinping
Abstract Lignin removal from lignocellulosic materials plays a great role in the utilization cellulose with high efficiency. In order to improve the quality of reconstituted tobacco sheet, lignin existed in tobacco stem was removed by enzymatic hydrolysis with laccase enhanced by weak alkali treatment together with the addition of Tween 80 into laccase treatment system. It is found that lignin was partially removed by laccase. The treatment of tobacco stem with NaHCO 3 resulted in the dissolution of lignin, and hence increased the porosity and specific surface area of the pretreated tobacco stem. Consequently, laccase could access to the tobacco stem more completely. The surface activity and dispersion of Tween 80 improved laccase activity, solubilization of degraded products of lignin, and contact interface between laccase and tobacco stem. The synergistic action of laccase, weak alkali and Tween 80 improved the ratio of lignin removal significantly, reaching as high as 40.3%. Graphical Abstract
研究领域:
生物化学
·
植物学
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DOI
高影响因子
AICHE JOURNAL
·
2024
·
IF 3.5
Guimei Zhou,Wenjun Yan,Shufan Yan,Dandan Gao,Debin Zeng,Dongdong Li,Dewen Zeng
Solvent extraction of lithium by β-diketones from alkaline brine has been known to be an efficient process. However, its relatively high working pH, consequently the high alkaline consumption and substantial dissolution loss in raffinate, limit its industrial application. Herein, a novel lithium extractant, i.e., 2-hydroxy-5-nitro-4- n -octoxy-benzophenone (referred to as N531), was proposed, which can extract lithium at relatively lower pH with remarkable low alkaline consumption and dissolution loss. Exactly, the pH corresponding to half lithium extraction is 8.5, and the Li/Na separation factor is ~500. The extractant concentration in the raffinate varied from 0.8 to 9.3 mg L −1 , depending on the pH and salinity. An application case was given to extract lithium from the raw brine of Zabuye salt lake, indicating that N531 is a commercially prospective extractant to extract lithium from alkaline brine.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Xinyan Suo,Bowen Yu,Jinting Sha,Runbo Gao,Mengyao Qi,Yehao Huang,Weijun Peng,Xiao Guo,Wei Wang,Yijun Cao,Chongqing Wang,Yukun Huang
Amine ether was initially used as a novel collector for the direct flotation of quartz to separate the quartz from feldspar under weak alkaline conditions. The flotation results demonstrated that the recovery differences between quartz and feldspar both decreased with the increase in the carbon chain length and number of alkoxy groups of amine ether. A recovery difference of nearly 90 % could be achieved between them at a pulp pH of 8.0 with dodecylamine polyoxyethylene ether (AC1210) serving as the collector. The results of the mechanism analysis demonstrated that AC1210 was effectively adsorbed on the quartz surface via electrostatic interaction and hydrogen bonding. However, the electrostatic repulsion between the K + on the feldspar surface and positively charged NH + groups of AC1210 weakened the adsorption of AC1210 on the surface of feldspar. The difference in the adsorption capacity of AC1210 between the quartz and feldspar promoted the selective direct flotation of quartz from the mixture of quartz and feldspar.
研究领域:
矿物加工工程
·
表面化学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Shiyu Zhang,Runnan Zhang,Runlai Li,Zixuan Zhang,Yafei Li,Hao Deng,Junhui Zhao,Tianrun Gu,Mengying Long,Xiaoyao Wang,Sui Zhang,Zhongyi Jiang
Positively charged nanofiltration membranes hold great potential in Li + /Mg 2+ separation, but their application in alkaline solutions, such as alkaline salt-lake brines has not been reported. Herein, inspired by the arginine's unique structure and biological function, we explore superstrong basic triaminoguanidine (TG) molecule as aqueous monomer to fabricate positively charged polyamide nanofiltration membranes for Li + /Mg 2+ separation. With the Li + /Mg 2+ mass ratios of 1:50 and 1:120, at pH 9.6, the separation factors (S Li,Mg ) of membranes reach 31.8 and 20.9. Meanwhile, at pH 5.6, the S Li,Mg are 46.4 and 36.4, which are the ever-reported highest value and such high S Li,Mg can be well retained in the pH range of 5.6–8.6. The superior Li + /Mg 2+ selectivity stems from the superhigh protonation capacity of guanidine groups in a broad pH range.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 11
·8719-8728
·
IF 4.6
Piao Luo,Kai Zhang,Nanjie Wu,Lanlan Wei,Shigui Peng,Qiao Fan,Tingting Luo,Yucheng Yin,Xiang Zhang,Yufei Liu,Min He,Jie Yu,Shuhao Qin
Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is a promising conductive polymer material, but its acidic nature leads to device deterioration and poor long-term durability. It is usual practice to neutralise PEDOT:PSS solutions with bases, resulting in a decrease of conductivity. The causes of the decline in conductivity remain disputed and uncertain. In this study, three bases (sodium hydroxide, ammonium hydroxide, and imidazole) were employed to treat PEDOT:PSS to investigate their effects on doping level, composition, and structure. The results show that bases may dedope PEDOT:PSS by removing the proton doping from the PEDOT chain. Meanwhile, insulating PSS is removed, and the aggregated structure is optimised to ensure that conductivity is not significantly reduced. The PEDOT:PSS treated with the weak base imidazole showed the least loss of conductivity due to only a modest decrease in doping level and the greatest loss of insulating PSS. Aluminium electrolytic capacitors made using imidazole pH-adjusted solutions have a capacitance ratio of up to 98.28% and an equivalent series resistance of 26 mΩ. These findings provide a valuable reference for developing high electrical characteristics and neutral PEDOT:PSS materials.
研究领域:
材料科学
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电子工程
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
·
2016
·
IF 2.208
Yue Sun,Peng Zuo,Junfen Luo,Rajendra Prasad Singh
Two novel weakly basic anion exchange resins (SZ-1 and SZ-2) were prepared via the reaction of macroporous chloromethylated polystyrene-divinylbenzene (Cl-PS-DVB) beads with dicyclohexylamine and piperidine , respectively. The physicochemical structures of the resulting resins were characterized using Fourier Transform Infrared Spectroscopy and pore size distribution analysis. The adsorption behavior of SZ-1 and SZ-2 for benzenesulfonic acid (BA) was evaluated, and the common commercial weakly basic anion exchanger D301 was also employed for comparison purpose. Adsorption isotherms and influence of solution pH, temperature and coexisting competitive inorganic salts (Na 2 SO 4 and NaCl) on adsorption behavior were investigated and the optimum desorption agent was obtained. Adsorption isotherms of BA were found to be well represented by the Langmuir model. Thermodynamic parameters involving Δ H , Δ G and Δ S were also calculated and the results indicate that adsorption is an exothermic and spontaneous process. Enhanced selectivity of BA sorption over sulfate on the two novel resins was observed by comparison with the commercial anion exchanger D301. The fact that the tested resins loaded with BA can be efficiently regenerated by NaCl solution indicates the reversible sorption process. From a mechanistic viewpoint, this observation clearly suggests that electrostatic interaction is the predominant adsorption mechanism. Furthermore, results of column tests show that SZ-1 possesses a better adsorption property than D301, which reinforces the feasibility of SZ-1 for potential industrial application.
研究领域:
化学工程
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环境科学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Lihao Liu,Suiqin Li,Kai Li,Jiahui He,Yuhang Wang,Jieyu Wang,Ying Chen,Yinjie Xu,Mengxin Wang,Yongyong Cao,Xing Zhong,Jianguo Wang
The selective electrocatalytic oxidation of alcohols (EOA) to aldehydes under weak alkaline conditions offers sustainable synthetic routes. However, a deficiency in basicity inevitably leads to diminished electrocatalytic efficiency, and the dynamic reconstruction mechanism of the electrocatalyst remains insufficiently researched. Herein, the NiMoO x -COOH electrocatalyst/4-acetamido-TEMPO (ACT) synergistic system was employed for the efficient EOA under weak alkaline. In situ studies reveal electric double layer-driven metal/ligand co-leaching induces in situ dissolution-redeposition of metal, forming active Ni 2 (CO 3 )(OH) 2 . Experimental and Density functional theory (DFT) studies confirm a synergistic electrocatalytic mechanism between NiMoO x -COOH and ACT. The reconstructed Ni 2 (CO 3 )(OH) 2 promotes ACTH surface adsorption, thereby facilitating the turnover cycle of ACT. Therefore, outstanding EOA electrocatalytic performance has been achieved (500 mA/cm 2 , 96 % high yield, maintaining 30 cycles for benzyl alcohol oxidation, 15 substrate examples and 100 g scales synthesis). This work offers a promising approach to achieving high-performance EOA under weak alkaline.
研究领域:
材料科学
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电化学
·
催化反应
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DOI
高影响因子
JOURNAL OF FOOD PROCESS ENGINEERING
·
2018
·Vol. 42
·期 2
·e12969
·
IF 1.955
Wu Zhong,Xinyue Li,Hong Yang,Erhu Li
In this study, an effective deacidification process for kiwifruit wine using ion exchange resins was investigated. Static adsorption experiments were conducted to screen an appropriate resin and optimize the volume ratio of resin to wine. Dynamic adsorption experiments were conducted to optimize the flow rate. Sensory and chemical analysis of the deacidified kiwifruit wine were also performed. The results demonstrated that 330 resin with a maximum adsorption capacity decreased total acid and citric acid to 4.32 and 1.39 g/L in kiwifruit wine. The acid adsorption process fitted Ho's sorption kinetic model well. The volume ratio of the 330 resin to wine and the feed flow rate were further optimized to be 1:30 and 4 mL/min. Kiwifruit wine with total acid and citric acid contents of 7.98 and 4.74 g/L was obtained, under optimum conditions, while preserving alcohol, vitamin C (Vc), flavonoids and phenol content, and improving the flavor. Practical applications The high acidity in kiwifruit wine depress the sensory quality and attraction to consumers. Resins are applied for liquid treatment because of high efficiency, insolubility and low cost. This work showed that 330 resin treatment is a promising method to deacidify kiwifruit wine and provided an economical and effective processing method for kiwifruit processing enterprises. Monitoring acidity change and kiwifruit wine quality help enterprises better control the process. Furthermore, the easy removal of resins will greatly reduce energy consumption, resulting in lower processing cost.
研究领域:
食品科学
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化学工程
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yifan Zhang,Yi Feng,Ziyan Zhang,Kaiming Fan,Kunpeng Zhang,Yanling Liu,Shengji Xia
Nanofiltration, an efficient process for separation of ions and organic matters, is paid universal attention to meet various requirements of water treatment. To tailor membrane performance, solution post-treatment has been demonstrated as one of effective approaches, while the efficacies and underlying mechanisms of the easily accessible reagents, i.e., weak acid or alkali solutions, remain to be explored. Herein, a systematical investigation was launched on the membrane post-treatment using several kinds of weak acid/alkali solutions with simultaneous heating. It was revealed that the solution pH mainly affected the proton migration during post-treatment and thus the further cross-linking tendency of the nascent membrane. Moreover, the specific acid/alkali species could also exert different impacts on physicochemical properties especially zeta potential of the resultant membranes. All the treated membranes had molecular weight cut-offs in the range of 200 to 250 Da with a water permeance of 20~30 L m -2 h -1 bar -1 , competitive in achieving efficient separation. Among them, the NaHCO 3 -treated membrane had the densest pore structure, while the Na 2 CO 3 -treated one was the most permeable. This research provided some insights on acid/alkali solution post-treatment and could be referenced to guide mild and facile membrane customization targeting different performance.
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高影响因子
ADSORPTION SCIENCE & TECHNOLOGY
·
2019
·
IF 1.2
Yue Sun,Weisheng Zheng,Deqiang Yin
Two novel weakly basic anion exchange resins BNH and BN2 bearing two different functional groups was fabricated via the two-step amination of chloromethylated polystyrene-divinylbenzene beads with dibutylamine and dimethylamine. The adsorption properties of BNH and BN2 for the 2-naphthalenesulfonic acid (NSA) removal from wastewater were compared with two synthesized monofunctional anion exchange resins BN0 and BN6 (derived from dimethylamine and dibutylamine, respectively). The experimental data revealed that the adsorption process on the four resins fitted well with the pseudo-second-order kinetics equation and the equilibrium isotherms were in good agreement with the Langmuir model. Thermodynamic analyses illustrated that 2-naphthalenesulfonic acid adsorption onto resins was an endothermic and spontaneous process. Importantly, BN2 still displayed relatively high adsorption capacity in the existence of Na2SO4, indicative of an excellent selectivity for 2-naphthalenesulfonic acid over sulfate than other resins. The obtained results elucidate that BN2 could have potential industrial application in effluent disposal fields because of its superior selectivity, acceptable kinetics, and desorption capability.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
ENVIRONMENTAL ENGINEERING SCIENCE
·
2017
·Vol. 34
·期 7
·528-535
·
IF 1.426
Yue Sun,Deqiang Yin,Junfen Luo,Yan Xu,Aimin Li
A novel weakly basic anion exchange resin AEC-5 bearing two differently sized functional groups was prepared through chloromethylated PS-DVB copolymer beads reaction with a mixture of dibutylamine and dimethylamine. To better understand the benefits of AEC-5 for removing benzenesulfonic acid (BSA) from aqueous solution, adsorption properties of BSA on AEC-5 were compared with two monofunctional anion exchange resins, a commercial exchanger D301 derived from dimethylamine and a synthesized resin AEC-4 derived from dibutylamine. Adsorption isotherms and effect of solution pH, temperature, time, and coexisting Na2SO4 on sorption behavior were investigated and column adsorption-regeneration tests were carried out. AEC-5 showed a greater adsorption capacity than both monofunctional anion exchangers for BSA in the presence of Na2SO4. Equilibrium and kinetic data could be well matched with the Langmiur isotherm model and pseudo-second-order model respectively. AEC-5 had better adsorption kinetics than AEC-4. Thermodynamic parameters were also analyzed and results indicate that BSA adsorption on AEC-5 is an exothermic and spontaneous process. AEC-5 is very likely to be a potential alternative adsorbent, which is believed to possess an excellent selectivity for BSA over sulfate, acceptable kinetics, and desorption characteristics, for its application in industrial wastewater treatment.
研究领域:
环境科学
·
化学工程
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DOI
高影响因子
JOURNAL OF MOLECULAR CATALYSIS B-ENZYMATIC
·
2014
·
IF 2.745
Bingbing Li,Yong Chen,Zhi Cao,Huanqing Niu,Dong Liu,Ying He,Xiaochun Chen,Jinglan Wu,Jingjing Xie,Wei Zhuang,Hanjie Ying
The reversible immobilization of crude nuclease P 1 fermented by Penicllium citrinum and used without further purification was performed via adsorption on a weak base anion resin activated by polyethylenimine (PEI). The immobilization conditions, including PEI concentration, the amount of support, the immobilization time, and the reusability of the PEI-activated resin were investigated. The results have shown that the PEI-activated resin has the capability of selectively adsorbing nuclease P 1 . Subsequently, the functional properties of the immobilized nuclease P 1 were studied and compared to those of the free enzyme. The apparent K m value for immobilized nuclease P 1 on the activated resin (15.31 g L −1 ) was about 4.41-fold higher than that of the free enzyme (3.47 g L −1 ), and the apparent V max value of the immobilized enzyme (530 U g −1 ) was about 3.9-fold less than that of the free enzyme (2082 U mL −1 ). The optimum temperature was observed to be 70 °C, 15 °C higher than that of the free enzyme. The optimum pH was the same for both free and immobilized nuclease P 1 (pH 5.0). The apparent activation energies ( E a ) of the free and immobilized nuclease P 1 were 163.09 kJ mol −1 and 156.32 kJ mol −1 , respectively, implying that the catalytic efficiency of the immobilized enzyme was restricted by mass-transfer rather than kinetic limitations.
研究领域:
生物化学
·
酶工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）