查找使用阿拉丁产品的科研文献

Equilibrium solubility of sodium 2,4-diaminobenzene sulfonate in liquid mixtures (methanol + water, isopropanol + water, and 1,2-propanediol + water) from 273.15 K to 323.15 K

Rongrong Li,Jiaqi Weng,Cuihong Ye,Anguo Ying,Qizhong Zhou,Aiguo Zhong,Hao Chen,Jianguo Yang

The equilibrium solubility of sodium 2,4-diaminobenzene sulfonate in liquid mixtures (methanol   +   water, isopropanol   +   water, and 1,2-propanediol   +   water) were determined at temperatures ranging from (273.15 to 323.15)   K. The solubility of sodium 2,4-diaminobenzene sulfonate increased with temperature increment but decreased with the concentrations of methanol, isopropanol or 1,2-propanediol in liquid mixtures. The obtained solubility data were correlated by Apelblat equation and Sun model. On the base of the measured solubility, the dissolution enthalpy ( Δ H sol o ) of the dissolution process were calculated.

Self-growing photonic composites with programmable colors and mechanical properties

Xue Juan,Yin Xuewu,Xue Lulu,Zhang Chenglin,Dong Shihua,Yang Li,Fang Yuanlai,Li Yong,Li Ling,Cui Jiaxi

Many organisms produce stunning optical displays based on structural color instead of pigmentation. This structural or photonic color is achieved through the interaction of light with intricate micro-/nano-structures, which are “grown” from strong, sustainable biological materials such as chitin, keratin, and cellulose. In contrast, current synthetic structural colored materials are usually brittle, inert, and produced via energy-intensive processes, posing significant challenges to their practical uses. Inspired by the brilliantly colored peacock feathers which selectively grow keratin-based photonic structures with different photonic bandgaps, we develop a self-growing photonic composite system in which the photonic bandgaps and hence the coloration can be easily tuned. This is achieved via the selective growth of the polymer matrix with polymerizable compounds as feeding materials in a silica nanosphere-polymer composite system, thus effectively modulating the photonic bandgaps without compromising nanostructural order. Such strategy not only allows the material system to continuously vary its colors and patterns in an on-demand manner, but also endows it with many appealing properties, including flexibility, toughness, self-healing ability, and reshaping capability. As this innovative self-growing method is simple, inexpensive, versatile, and scalable, we foresee its significant potential in meeting many emerging requirements for various applications of structural color materials.

The role of hydroxylation on·OH generation for enhanced ozonation of benzoic acids: Reactivity, ozonation efficiency and radical formation mechanism

Zhe Wang,Xiaozi Lin,Yuanxing Huang,Luming Ma

Efficient removal of trace olefins in aromatics by novel acetamide-based acidic deep eutectic solvents

Xiaoyu Yao,Xuan Meng,Jie Yin,Tao Yin,Tianyi Luo,Naiwang Liu,Li Shi

The alkylation of olefins with aromatics (AOA) is considered an attractive method for removing trace olefins from aromatics. The catalyst with appropriate acidity is an important feature to control the alkylation reaction. In this work, a series of innovative acetamide (AC)-based acidic deep eutectic solvents (ADESs) with different organic sulfonic acids as hydrogen-bond donors (HBDs) were synthesized and used in AOA. The formation mechanism of ADES was investigated utilizing FT-IR spectroscopy, 1 H NMR, and quantum chemistry calculations combined with the phase diagram. In addition, the factors affecting the removal of olefins were further studied. Under optimal conditions, the most effective ADES ([AC:2TfOH]) can achieve 100% olefin conversion, and it can still reach 90% after 8 cycles. Finally, the mechanism of ADES ([AC:2TfOH]) catalyzed alkylation of aromatics and olefins was first investigated and proposed by in-situ diffuse reflectance infrared spectroscopy ( in-situ DRIFT) and gas chromatography-mass spectrometry (GC–MS).

A Hybrid Process for Valorization of d-Fructose to 2,5-Bis(hydroxymethyl)furan by Bridging Chemocatalysis and Biocatalysis in a Betaine:Benzenesulfonic Acid System

Yu Peng,Luyao Jiang,Junhua Di,Cuiluan Ma,Qi Li,Yucai He

Biobased 2,5-bis(hydroxymethyl)furan is a versatile building block for the production of drugs, polymers, crown ethers, bioactive compounds, and value-added intermediates. To explore a more efficient route to synthesize 2,5-bis(hydroxymethyl)furan, a tandem transformation by quick dehydration with a deep eutectic solvent betaine:benzenesulfonic acid (Bet:BSA) and mild bioreduction with recombinant Escherichia coli (E. coli) DCF was developed for converting d-fructose into 2,5-bis(hydroxymethyl)furan. The 5-hydroxymethylfurfural yield reached 62.3 ± 1.6% (based on d-fructose) in Bet:BSA at 120 °C after a short time (2 min). d-Fructose-valorized 5-hydroxymethylfurfural was biologically transformed to 2,5-bis(hydroxymethyl)furan by newly constructed recombinant E. coli DCF containing reductase and formate dehydrogenase at 40 °C and pH 7.5 after 48 h, with a yield of 99.6 ± 0.1% (based on 5-hydroxymethylfurfural) in Bet:BSA-water containing the cosubstrate HCOONa (5-HMF-to-HCOONa molar ratio, 1:2.5). Meanwhile, 150 mM commercial 5-hydroxymethylfurfural was transformed into 2,5-bis(hydroxymethyl)furan in a yield of 94.4 ± 0.9%. An efficient hybrid process was constructed to valorize d-fructose to 2,5-bis(hydroxymethyl)furan in Bet:BSA-water, which has good industrial application potential.

Dealumination-controlled strategy mediates Ti–Y zeolite with cooperative active sites for selective oxidations

Haoyi Lin,Jiaxing Zhang,Qingxu Duan,Kaixuan Yang,Weiping Liao,Shixue Qi,Hongying Lü,Zhiguo Zhu

Plentiful heteroatom-containing zeolites as versatile redox catalysts have been successfully post-synthesized via the top-down methodology, where the starting aluminosilicate zeolites are normally expected to be highly dealuminated to maximize the amounts of silanol nests and occasionally to evade the detrimental effect of framework Al ions on the catalytic performance. Herein, our proposed dealumination-controlled strategy for the synthesis of hierarchical Ti–Y zeolite breaks through this concept. Framework-substituted Ti and tri-coordinated Al species were afforded from the interaction of Ti ions with dealumination-derived silanol nests and from the process of acid treatment, respectively. Structure–function relationships revealed that Lewis acid sites were the catalytically active centres of Ti–Y zeolite in oxidative desulfurization with hydrogen peroxide as the oxidant, which came from the cooperative effect of dual active sites containing framework-substituted Ti and tri-coordinated Al species. The amounts of Lewis acid sites demonstrated a volcanic-type trend as the acid-treatment time increases. The reusability, regeneration ability, deactivation mechanism were also systematically investigated in oxidative desulfurization. Thus the Ti–Y zeolite catalyst was also effective for Baeyer–Villiger oxidation of 2-adamantanone. This work discloses the effectiveness of preparing an efficient Ti–Y zeolite catalyst with cooperative dual active sites via a dealumination-controlled strategy, which bears potential application for constructing other heteroatom-containing FAU-type zeolites with Lewis acid property.

Photocatalytic mechanism conversion of titanium dioxide induced via surface interface coordination

Cheng Chen,Yu Zhao,Ting Lei,Dingming Yang,Yanfang Zhou,Jiawei Zeng,Ruzhen Xie,Wenyuan Hu,Faqin Dong

Photocatalytic removal of organic pollutants is a promising pollution treatment technology from the aspect of carbon neutrality . The complex diversity of actual wastewater components, as opposed to single-component systems, can significantly affect photocatalytic mechanisms. In this study, complex pollutant systems were created using various coordinating agents, and the effects of P25 on the photocatalytic removal of methyl orange (MO) in these systems and corresponding photocatalytic mechanism were investigated. The results show that photocatalytic removal of MO by P25 using ligands is significantly more efficient, especial removal of MO by the EDTA-P25 (P-E 2.5 ) coordination system resulted dramatically improved MO removal (97.4% versus 12.3% achieved by pure P25 after 15 min), with the reaction rate improved 23.8-fold. Theoretical calculations show that the effective coordination bonds formed by the coordinating agent and Ti atoms reduce the adsorption energy of P25 for MO. In addition, introduction of the coordinating agent EDTA reduces the transition state energy during the MO degradation process and greatly accelerates the reaction rate, and the conduction band position of the EDTA-P25 coordination system shifts to a more negative potential, which induces to the generation of •O 2 − for effective MO degradation.

Using poly(N-Vinylcaprolactam) to Improve the Enzymatic Hydrolysis Efficiency of Phenylsulfonic Acid-Pretreated Bamboo

Lv Xianqing,Yang Guangxu,Gong Zhenggang,Cheng Xin,Shuai Li,Huang Liulian,Chen Lihui,Luo Xiaolin,Liu Jing

Chemical pretreatment followed by enzymatic hydrolysis has been regarded as a viable way to produce fermentable sugars. Phenylsulfonic acid (PSA) pretreatment could efficiently fractionate the non-cellulosic components (hemicelluloses and lignin) from bamboo and result in increased cellulose accessibility that was 10 times that of untreated bamboo. However, deposited lignin could trigger non-productive adsorption to enzymes, which therefore significantly decreased the enzymatic hydrolysis efficiency of PSA-pretreated bamboo substrates. Herein, poly(N-vinylcaprolactam) (PNVCL), a non-ionic surfactant, was developed as a novel additive for overcoming the non-productive adsorption of lignin during enzymatic hydrolysis. PNVCL was found to be not only more effective than those of commonly used lignosulfonate and polyvinyl alcohol for overcoming the negative effect of lignin, but also comparable to the robust Tween 20 and bovine serum albumin additives. A PNVCL loading at 1.2 g/L during enzymatic hydrolysis of PSA pretreated bamboo substrate could achieve an 80% cellulosic enzymatic conversion and meanwhile reduce the cellulase loading by three times as compared to that without additive. Mechanistic investigations indicated that PNVCL could block lignin residues through hydrophobic interactions and the resultant PNVCL coating resisted the adsorption of cellulase via electrostatic repulsion and/or hydration. This practical method can improve the lignocellulosic enzymatic hydrolysis efficiency and thereby increase the productivity and profitability of biorefinery.

Selective Deoxygenation of Lignin-Derived Phenols and Dimeric Ethers with Protic Ionic Liquids

Shaoqi Yang,Guangming Cai,Xingmei Lu,Chenguang Wang,Mi Feng,Junli Xu,Qing Zhou,Jiayu Xin,Longlong Ma

Hydrodeoxygenation (HDO) of lignin-derived phenols and dimeric ethers to biofuels has great significance for advanced utilization of renewable lignocelluloses and the future biobased economy. Herein, we find that the deoxygenation process during the lignin-derived model compound HDO process could efficiently be catalyzed by low-cost protic ionic liquids under mild conditions. 2-Hydroxy-N-(2-hydroxyethyl)-N-methylethanaminium trifluoromethanesulfonate ([BHEM]CF3SO3) shows the highest catalytic activity for the deoxygenation reaction during the lignin-derived compound HDO process with Rh/C as the hydrogenation catalyst. The conversion of phenol is 100% under 4 MPa H2 at 130 °C for 6 h, and the yield of cyclohexane is 93.3%. Furthermore, the catalytic system with [BHEM]CF3SO3 as the deoxygenation catalyst and Rh/C as the hydrogenation catalyst demonstrates efficient catalytic activity for various lignin-derived phenols and dimeric ethers with ≥99.0% conversion and >90.0% selectivity. The catalytic system is reused five times for HDO of phenol to test its stability.

Green aerobic oxidative desulfurization of diesel by constructing an Fe-Anderson type polyoxometalate and benzene sulfonic acid-based deep eutectic solvent biomimetic cycle

Jiajia Xu,Zhiguo Zhu,Ting Su,Weiping Liao,Changliang Deng,Dongmei Hao,Yuchao Zhao,Wanzhong Ren,Hongying Lü

A unique redox-coupled biomimetic system was developed, in which Fe-Anderson type polyoxometalates (POMs) were employed as electron transfer mediators (ETMs) and benzenesulfonic acid (BSA)-based deep eutectic solvents (DESs) were used as electron-donors for aerobic oxidative desulfurization (AODS) of diesel fuel. Different compositions of DESs were used and the polyethylene glycol 2000 (PEG2000)/2.5BSA system showed the highest desulfurization activity, with the removal of dibenzothiophene (DBT) at 60 °C reaching 95% in 60 min. The excellent desulfurization activity of the system is due to the in situ formation of peroxysulfonate via a biomimetic process . By constructing a coupled redox system, Fe-Anderson type POMs as ETMs reduce the activation energy of oxygen-activated sulfonate. The physical characteristics of four different DESs were tested. The results show that the conductivity of DESs is correlated with the composition of BSA-based DESs. However, there is no similar trend in viscosity testing at the same temperature, and the maximum viscosity value is obtained for the PEG2000/2.5BSA system at 60 °C, which may be associated with the stronger hydrogen bonds. It is worth noting that the PEG2000/2.5BSA system also possesses the best desulfurization activity, which suggests that the activity of the desulfurization system is related to the strength of the hydrogen bond in DESs. Finally, the biomimetic desulfurization system exhibits excellent performance and good stability under mild reaction conditions (60 °C, atmospheric pressure, oxygen as the oxidant).

Two functional post-cross-linked polystyrene resins: Effect of structure on the enhanced removal of benzene sulfonic acid

Huan Wang,Yuhua Wang,Xiaoling Sun,Huiping Hu,Qifan Peng

In this paper, two aminated post-cross-linked polystyrene resins, PSAMPpc and PSAPpc, were correspondingly synthesized from macroporous chloromethylated polystyrene beads (PS-Cl) via a two-step process with amination reaction and Friedel-Crafts reaction. The structures of the resins were characterized by Fourier transform infrared spectrum (FT-IR), Elemental analysis and N 2 adsorption-desorption isotherms, respectively. And the adsorption performances of the resins towards benzene sulfonic acid (BSA) were systematically evaluated by the conduction of batch adsorption experiments. It was indicated that the introduced functional groups greatly improved polarity of the resins, and the Brunauer-Emmett-Teller (BET) surface area was increased after Friedel-Crafts reaction. Furthermore, it was showed that the aminated post-cross-linked PSAMPpc and PSAPpc performed enhanced adsorption capacities in comparison with amino-modified macroporous polystyrene resins PSAMP and PSAP, and the maximum adsorption capacities of PSAMPpc and PSAPpc fitted by Langmuir isotherm model were 370.4 mg/g and 454.5 mg/g (dry basis), respectively. Additionally, the existence of sulfate anion decreased the adsorption capacity of the resins towards BSA from aqueous solutions, whereas PSAMPpc behaved better adsorption selectivity of benzene sulfonic anion over sulfate anion in comparison with PSAPpc. Moreover, with respect to the dynamic adsorption-desorption experiments, the dynamic saturated adsorption capacities of PSAMPpc and PSAPpc were calculated to be 201.21 and 333.62 mg/g (dry basis), respectively. It was found that the BSA-loaded resins could be well regenerated by 0.01 mol/L of NaOH aqueous solution, and PSAMPpc and PSAPpc resins also exhibited satisfactory adsorption efficiencies even after five-cycle adsorption-desorption operations.

Corrosion inhibiting performance and mechanism of protic ionic liquids as green brass inhibitors in nitric acid

Pengcheng Hu,Zhitao Wu,Junlin Wang,Yuqing Huang,Quanyou Liu,Shu-Feng Zhou

Four protic ionic liquids (ILs) were synthesized via a one-step method by using benzotriazole (BTA) and benzimidazole as cations, and benzenesulfonic acid and 2-naphthalenesulfonic acid (NSA) as anions. These ILs were used as green corrosion inhibitors for brass specimens in a nitric acid solution. The structure of the protic ILs was characterized by 1 H-NMR, 13 C-NMR, and FT-IR spectroscopy. The effects of the IL structure, IL concentration, acid concentration, and corrosion time on the surface morphology of brass specimens and the inhibition efficiency ( η %) of ILs were investigated by the weight loss method combined with SEM and EDS spectroscopy. Polarization curves and impedance spectroscopy were used to analyze the electrochemical corrosion inhibition mechanism of ILs. Results showed that IL synthesis was a proton transfer process, and the proton of the –SO 3 H group on NSA was deprived by BTA. IL [BTA][NSA], which had a high charge density and large conjugate π band, was the most effective inhibitor for brass corrosion. The η % of [BTA][NSA] decreased with the increase in acid concentration and corrosion time, which showed an increment with the increase in [BTA][NSA] concentration. The higher the η % of [BTA][NSA] is, the smoother the surface of the brass specimens is, and the smaller the undistributed area of Cu element will be. Corrosion inhibiting mechanism from electrochemical analysis indicated that the addition of [BTA][NSA] increased the polarization resistance of the brass electrode significantly and suppressed both anodic and cathodic reactions.