CHEMICAL PAPERS
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2018
·Vol. 72
·期 6
·1339-1345
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IF 0.963
Li Bin,Chen Dan,Zhang Xiaoli,Dong Wenbo,Zhao Binxia
A catalyst comprised of 4-dimethylaminopyridine (DMAP) functionalized silica gel (SG-DMAP) was prepared via a convenient N-alkylation of 4-methylaminopyridine (MAP) with γ-chloropropylated silica gel promoted by potassium iodide. FT-IR, TG, SEM results illustrated that the DMAP was successfully immobilized on silica gel and the BET result suggested the pore structure was not altered after immobilization process. The highest immobilization amount of 0.75 mmol/g was obtained at 130 °C for 12 h. Activity test demonstrated that silica gel immobilized DMAP could be serve as a heterogeneous catalyst for the acylation with significant activity and stability.
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RSC Advances
·
2018
·Vol. 8
·期 13
·6840-6848
·
IF 2.936
Ying Guo,Bing Liao,Kun Wang,Yangyang Zhao,Qiwen Yong,Hongwei Zhao,Hao Pang
We prepared poly(N-isopropylacrylamide-co-4-tert-butylcalix[8]arene) (PNIPAM-TBCX) hydrogels by copolymerization of N-isopropylacrylamide (NIPAM) with 4-tert-butylcalix[8]arene (TBCX) to capture hazardous pentachlorophenol (PCP) from aqueous solution. Adsorption experiments showed that the adsorption capacities of PNIPAM-TBCX hydrogels reached 1.96, 2.08 and 2.02 mg PCP per 1 g of hydrogel, while the molar percentage ratio of TBCX in the hydrogels was as low as 0.5%, 0.7% and 1%. The equilibrium adsorption of PCP on the hydrogels was studied using different adsorption models. In addition, the PNIPAM-TBCX hydrogel still retained its performance when regenerated several times by immersing in water at 323 K.
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INDUSTRIAL CROPS AND PRODUCTS
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2025
·
IF 6.2
Xinyu Guo,Chuchu Chen,Huan Jiao,Wenjuan Wu,Yongcan Jin,Zhiqiang Liang,Bo Jiang
Lignin-based carbon materials constructed by additive manufacturing are at the forefront for energy and environment research due to the abundant carbon element, low-cost, and sustainable features of lignin. Yet the uncontrollable rheological behavior and rigid structure often lead to lignin being used as an additive and the amount is very low, impeding its efficient application. Herein, we developed a low-cost direct ink writing strategy to fabricate 3D scaffolds with high lignin content (over 80 %). The printed filaments display excellent self-supporting capacity and keep intact even subjected to carbonization. As a proof of concept, the branches-leaves-inspired Pd/TiO 2 hierarchical photocatalyst was further decorated on the carbonized scaffolds for efficient catalytic reduction of 4-nitrophenol. Combined the controllable macro- and micro-structure of the scaffolds, the high light harvesting ability and specific surface area of Pd/TiO 2 hierarchical structure, the carbon-based catalyst demonstrates outstanding photocatalytic reduction activity to 4-nitrophenol, with the turnover frequency value up to 8.73 min −1 , much higher than most other carbon-based catalysts. The developed carbon-based hierarchical photocatalyst also shows good catalytic stability and reusability. This facile and scalable high content lignin 3D printing technique opens a new avenue to fabricate lignin-based carbon materials for widespread applications.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Letu Siqin,Wenjing Xin,Ruijian Liu,Hongmei Luan,Lei Wang,Yiming Wang,Shuyu Li,Jingyuan Guo,Yu He,Jiayong Zhang,Bin Yao,Chengjun Zhu
Interfaces quality have always been considered the key factors in the fabrication of efficient Cu 2 ZnSn(S,Se) 4 (CZTSSe) solar cells, and harmful defects at the interface can significantly reduce the performance of the device. Here, we propose a dual passivation strategy by adding Na to the surface of the absorber layer (CZTSSe) to passivate the CZTSSe/CdS interface and treating the buffer layer (CdS) using ultraviolet (UV) irradiation to passivate the CdS/ZnO interface. Due to the Na doping passivation, the absorber surface conductivity increases while the roughness decreases and detrimental defects that can lead to nonradiative recombination are reduced. The power conversion efficiency (PCE) of the cell is improved by about 1 percentage point by Na passivation. The contributions of open-circuit voltage ( V oc ), short-circuit current density ( J sc ), and fill factor (FF) to the improvement of PCE have been quantified as 50.64%, −5.58%, and 54.94%, indicating that Na doping can significantly boost V oc and FF. UV-ozone passivation reduces residual carbon organics in the CdS buffer layer , weakens carrier recombination, allows for more light absorption , and widens the depletion region , which favors efficient carrier collection. The estimated contribution of V oc , J sc , and FF to the PCE of the device is 8.78%, 119.59%, and −28.37%, respectively, demonstrating that UV-ozone passivation can significantly improve the J sc of the device. The two passivation strategies complement each other's advantages and achieve a synergistic effect . Our prepared champion device exhibits a PCE of 10.69% and remarkable long-term stability.
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JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2025
·
IF 6
Xinliang Liu,Kuan Cai,Ziyi Zhong,Jiulong Sha,Xingxiang Ji,Parikshit Gogoi,Hainong Song,Shuangfei Wang,Jinge Guo
The peroxydisulfate (PDS)-based advanced oxidation process (AOP) has attracted great attention as an effective technique for oxidatively decomposing organic pollutants. g-C 3 N 4 , an excellent photocatalyst, has been studied to activate PDS, but the rapid photogenerated electron-hole recombination severely impedes its photocatalytic performance. Herein, highly efficient point-defect engineering by doping atoms as well as vacancies was adopted to modulate photoinduced exciton dissociation kinetics. We successfully synthesized C-doped carbon nitride (xC-g-C 3 N 4 ) by a one-step copyrolysis method using glucose and melamine as raw materials. C-doped carbon nitride can act as an electron bridge for electron transfer, leading to xC-g-C 3 N 4 with a wider light absorption range (from 475 nm to 527 nm), narrower band gap (from 2.76 eV to 2.66 eV) and higher charge separation efficiency (from 3.79 μA/cm 2 to 3.22 μA/cm 2 ). The enhanced visible light absorption performance and the reduced electron-hole pair recombination rate of xC-g-C 3 N 4 can efficiently initiate PDS. The obtained xC-g-C 3 N 4 catalyst exhibited superior photocatalytic activation performance of PDS for 4-CP degradation under visible light illumination. The degradation rate of 4-CP reached 88.3 %, with a total organic carbon (TOC) removal rate of approximately 87.9 %, which increased by 67.9 % and 160 %, respectively. This study highlights a new effective method of carbon doping in g-C 3 N 4 for activating PDS in the degradation of 4-CP.
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CELLULOSE
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2025
·
IF 4.8
Zhao Yao,Wang Xueping,Li Bowen,Si Tian,Gao Xin,Peng Lincai,Zhang Heng
The cellulose catalytic oxidation system mainly comprises inorganic ion-based oxidants. Hence, the selective oxidation of C 6- primary hydroxy groups (C 6 -OH) of cellulose, catalyzed by piperidine free radicals, was limited to the homogeneous cellulosic system containing protic solvents or heterogeneous system. In this work, the use of the catalytic system containing 4-acetamido-2,2,6,6-tetramethylpiperidine 1-oxyl (4-AcNH-TEMPO) was extended to the cellulosic solution in N, N-dimethylacetamide (DMAc) and combined with chlorine dioxide. Results showed that the carboxyl content was 0.832 mmol/g. Meanwhile, the degree of polymerization decreased from 900 to 489. This study provides an effective route for the homogeneous selective oxidation of primary hydroxy groups in cellulose and explored its oxidation mechanism in DMAc solvent. Furthermore, studies showed that the reactive chlorine species- ClO·, Cl·, and ClO 2 played a crucial role in the oxidation process. The methodology developed here displayed great potential to be utilized to various biomolecules in aprotic solvents homogeneous system based on 4-AcNH-TEMPO as oxidation catalysts.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Shuang Guo,Shuo Liu,Chang Liu,Yi Wang,Dongyu Gu,Jing Tian,Yi Yang
Immobilization technology plays an important role in enhancing enzyme stability and environmental adaptability. Despite its rapid development, this technology still encounters many challenges such as enzyme leakage, difficulties in large-scale implementation, and limited reusability. Drawing inspiration from natural paired molecules, this study aimed to establish a method for immobilized α-glucosidase using artificial antibody-antigen interaction. The proposed method consists of three main parts: synthesis of artificial antibodies, synthesis of artificial antigens, and assembly of the artificial antibody-antigen complex. The critical step in this method involves selecting a pair of structurally similar compounds: catechol as a template for preparing artificial antibodies and protocatechualdehyde for modifying the enzyme to create the artificial antigens. By utilizing the same functional groups in these compounds, specific recognition of the antigen by the artificial antibody can be achieved, thereby immobilizing the enzymes. The results demonstrated that the immobilization amount, specific activity, and enzyme activity of the immobilized α-glucosidase were 25.09 ± 0.10 mg/g, 5.71 ± 0.17 U/mg protein and 143.25 ± 1.71 U/g carrier , respectively. The immobilized α-glucosidase not only exhibited excellent reusability but also demonstrated remarkable performance in catalyzing the hydrolysis of 4-methylumbelliferyl-α-D-glucopyranoside.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Libo Sun,Qingtai Xie,Heshun Jing,Jindong Xie,Wenyu Tan,Baorong Duan,Xun Sun,Caixia Qi,Huijuan Su
The development of nanogold catalysts with high activity and high stability is of great significance for their industrial applications. In this paper, Au-PDA@Fe 3 O 4 catalysts were prepared through the gold sol adsorption method. First, micron-sized magnetic Fe 3 O 4 spheres were synthesized via a solvothermal method, serving as the core to endow the catalyst with excellent recyclability. Subsequently, a layer of polydopamine (PDA) shell was polymerized on the magnetic core surface. By controlling the timing of introducing the gold sol containing Au nanoparticles (NPs), the spatial position of Au NPs within the PDA layer was regulated, leading to a series of magnetic core-shell nano gold catalysts with varying spatial positions of Au. Using the 4-nitrophenol (4-NP) hydrogenation as the probe, the influence of Au spatial position, Au size, and other conditions on the catalytic performance was investigated. Results showed that, in the prepared Au-PDA@Fe 3 O 4 -16 catalyst, the Au NPs are encapsulated within the PDA shell and positioned close to the outer layer. This not only provides remarkable stability to the Au NPs but also maintains their proximity to the surface of the PDA shell, allowing easier access of the substrate 4-NP to the Au NPs and conferring good reactivity upon the catalyst. The strong electron metal-support interaction between PDA and Au enables PDA to effectively stabilize Au NPs. The prepared Au-PDA@Fe 3 O 4 -16 catalyst exhibits excellent stability, maintaining a high conversion rate of 91 % even after 14 cycles of use. Our findings not only deepen the understanding of the catalytic mechanisms involved but also pave the path towards the creation of highly efficient and robust gold-based catalysts, facilitating their widespread utilization in industrial applications.
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Small
·
2024
·
IF 13
Jinfeng Zheng,Yu Qiu,Shengnan Liao,Zhihao Yue,Shan Fang,Naigen Zhou,Yong Li,Yinzhu Jiang
Building a stable cathode-electrolyte interface (CEI) is crucial for achieving high-performance layered metal oxide cathode materials LiNi x Co y Mn 1-x-y O 2 (NCM). In this work, a novel 4-fluorobenzene isocyanate (4-FBC) electrolyte additive that contains isocyanate and benzene ring functional groups is proposed, which can form robust and homogeneous N-rich and benzene ring skeleton CEI film on the cathode surface, leading to significant improvement in the electrochemical performance of lithium-ion batteries. Taking LiNi 0.5 Co 0.2 Mn 0.3 O 2 (NCM523) as an example, the NCM523/SiO@Graphite pouch full cells with electrolytes containing a mass fraction of 1% 4-FBC additives demonstrate improved capacity retention after 200 cycles, retaining capacity retention rates of 81.3%, which is much higher than that of 39.1% without additive. The improvement can be ascribed to the mitigation of electrolyte decomposition and inhibition of transition metal ions the dissolution from the cathode material due to the stable CEI film. Moreover, the electrochemical performance enhancement can also be achieved in high voltage and Ni-rich cathode materials, indicating the universality and effectiveness of this strategy for the practical applications of high energy density lithium-ion batteries.
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ATMOSPHERIC ENVIRONMENT
·
2024
·
IF 4.2
Ruoyuan Lei,Yingying Sha,Haifeng Meng,Yu Huang,Jianhuai Ye,Dan Dan Huang,Yunjiang Zhang,Yun Wu,Yongjie Li,Xinlei Ge
4-nitrocatechol (4NC) is a model compound of nitrophenols, an important group pf light-absorbing species, a.k.a., brown carbon (BrC), that have significant impacts on air quality and radiation forcing. This work aims to elucidate the kinetics, chemical and optical properties as well as oxidation potential (OP) of 4NC during aqueous photolysis. Results show that hydroxyl radical (∙OH) initiated photo-oxidation has the fastest reaction rate (6.1 ×10 -5 s -1 ) followed by organic triplet state ( 3 C*) induced photolysis (3.8 ×10 -5 s -1 ) and direct photolysis (2.4 ×10 -5 s -1 ); the second-order rate constant of ∙OH with 4NC is determined to be 4.3 × 10 10 M -1 s -1 . Reaction pathways of 3 C*-initiated photolysis and ∙OH-initiated photolysis are largely different, with the former generating more oxygenated species, but their mass yields of products after 12 hours of irradiation are close (∼40 %). Aqueous ageing of 4NC overall leads to the decrease of light absorption, and the photo-bleaching rates are in an order of ∙OH (2.58 × 10 -5 s -1 ) > 3 C* (1.06 × 10 -5 s -1 ) > direct photolysis (5.83 × 10 -6 s -1 ) too; the second-order photo-bleaching rate constant of ∙OH with 4NC is 1.77 × 10 10 M -1 s -1 . On the other hand, aqueous ageing can also produce BrC species (not sufficient to offset the photo-bleaching effect) of which some nitrogen-containing organics are an important part, and 3 C*-photolysis has the strongest production ability. Furthermore, aqueous photolysis of 4NC can decrease its OP, especially the ∙OH-photolysis products are nearly non-toxic while those from 3 C*-photolysis still has significantly high OP at the end of oxidation. Finally, we estimated the atmospheric lifetimes of 4NC against ∙OH in different atmospheric environments, which range from a few seconds to tens of hours.
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MICROCHIMICA ACTA
·
2010
·Vol. 169
·期 1
·87-92
·
IF 2.648
Yin Huanshun,Zhou Yunlei,Ai Shiyun,Liu Xianggang,Zhu Lusheng,Lu Linan
A glassy carbon electrode was modified with hydroxyapatite nanopowder (HA-NP) and characterized in terms of electrochemical oxidation of 4-nitrophenol (4-NP) via cyclic voltammetry, differential pulse voltammetry, chronoamperometry, and chronocoulumetry. The oxidation peak current of 4-NP at the modified electrode was increased (compared to the bare GCE), thus indicating that the HA-NP exhibits a remarkable enhancement effect on the electrochemical oxidation of 4-NP. The effects of loading with HA-NP, pH value, scan rate and accumulation time were examined. The oxidation peak current of 4-NP is proportional to its concentration in the range from 1.0 μM to 300 μM, with a correlation coefficient of 0.9996. The detection limit is 0.6 μM (at an S/N = 3). The method is simple, selective and sensitive. It was successfully applied to the determination of 4-NP in water samples, with recoveries ranging from 96% to 104%.
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INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Ya-Lan Deng,Chun-Li Hu,Jiang-Gao Mao
The π-conjugated [C3H6+xN6]x+ (x = 0–3) cations are good functional groups, which are widely employed in the preparations of nonlinear optical (NLO) and birefringent materials due to their high hyperpolarizability and optical anisotropy. In this paper, the first melamine hydroxyborate [C3H7N6]3[B3O5(OH)2] (MelBO-I) was synthesized by the boric acid melting method under the molar ratio of H3BO3:C3H6N6 = 1:1. MelBO-I (P21/c) exhibits a two-dimensional (2D) {[C3H7N6]3[B3O5(OH)2]}∞ layer composed of [C3H7N6]+ cations and [B3O5(OH)2]3– anions interconnected via hydrogen bonds. MelBO-I exhibits significant birefringence (Δn = 0.286@546 nm). Under the molar ratio of H3BO3/C3H6N6 = 3:1, [C3H8N6]4[B12O19(OH)6] (MelBO-II) was isolated. In MelBO-II (P21), highly polymerized [B12O19(OH)6]8– groups form a 3D network through hydrogen bonding, featuring 1D tunnels of 8-membered and 16-membered rings filled by [C3H8N6]2+ cations. MelBO-II is the first noncentrosymmetric (NCS) bifunctional melamine borate with a moderate SHG response (0.4 × KDP) and large birefringence (Δn = 0.285@546 nm). The results indicate that incorporating [C3H6+xN6]x+ (x = 0–3) cations into borate can effectively induce birefringence. A high concentration of boric acid promotes the formation of large boric acid cluster anions and facilitates the transformation from the CS to NCS structure.
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