Nanomaterials
·
2025
·Vol. 15
·期 6
·432
·
IF 4.3
Xin Zhong,Xiaojun Liu,Meihuan Ji,Fubin Jiang
As the most promising techniques for refractory antibiotic degradation in wastewater management, sulfate radical-based advanced oxidation processes (SR-AOPs) have attracted considerable attention. However, systematic studies on potassium peroxymonosulfate (PMS) activation by MOF-derived metal oxides coated with LDH materials are still lacking. In this work, a series of catalysts consisting of CoCu-MOFs coated with CuAl/LDH were synthesized for PMS activation in the removal of sulfamethoxazole (SMX). As expected, CoCu-MOFs coated with CuAl/LDH catalyst showed high SMX removal and stability in PMS activation. In the CoCu/LDH/PMS reaction, the SMX removal was nearly 100% after 60 min, and the mineralization reached 53.7%. The catalyst showed excellent catalytic stability and low metal leaching concentrations (Co: 0.013 mg/L, Cu: 0.313 mg/L), as detected by ICP. Sulfate radicals and hydroxyl radicals were identified as the dominant reactive species in the CoCu/LDH/PMS system. Moreover, the presence of 1 O 2 in the process revealed the coupling of non-radical and radical processes. The XPS results showed that the layered structure of CoCu/LDH promoted the recycling of metal ions (high and low valence), which facilitated heterogeneous PMS activation. The effects of different reaction conditions and reuse cycles were also determined. The SMX oxidation pathways were proposed based on the intermediates identified by LC/MS. The high activity and stability of CoCu/LDH provide a new mechanistic understanding of PMS activation catalysts and their potential utilization in practical wastewater treatment.
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Waste and Biomass Valorization
·
2024
·Vol. 15
·期 8
·5043-5052
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IF 2.6
Yang Wei,Yang Fan,Wu Shengji,Che Lei
Ball milling of rice straw impregnated with sulfuric acid (RS-S), hydrochloric acid (RS-H), acetic acid (RS-A), or nitric acid (RS-N) were carried out in this study. Physicochemical analysis and subcritical water hydrolysis were performed to evaluate the effect of acid species on ball milling treatment of rice straw. Acetic acid and solo ball milling treatment showed little effect on solubility, thermal stability and crystalline structure of rice straw, while hydrochloric acid, acetic acid and nitric acid significantly improved the solubility and decreased the crystallinity index and thermal stability of rice straw. Sulfuric acid was found to be the most efficient acid to destroy the rice straw structure during ball milling followed by nitric acid and hydrochloric acid, attributed to its long retention on rice straw surface after drying. The effective cleavage of holocellulose-lignin chemical linkages in RS-S during pretreatment made the hydrolysis products of RS-S easier to be hydrolyzed to biochar at high reaction temperatures, resulting in the increased solid residue yield. The breakage of crystallites and holocellulose-lignin chemical linkages greatly improved the reactivity of RS-S, resulting in the lower temperature and activation energy required to initiate the hydrolysis reaction compared with those of rice straw and RS-A. Graphical Abstract
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CARBOHYDRATE RESEARCH
·
2024
·
IF 2.4
Feng Li,Guohua Rao
Fig fruit is widely accepted in warm and tropical regions due to the sweet taste and health benefits. The polysaccharides in fig fruit are responsible for the health benefits. However, information regarding polysaccharide structure remains limited. In this study, the water-soluble polysaccharides (FFP) were extracted from fig fruit with a yield of 15.3 mg/g. Anion exchange chromatography and gel permeation chromatography were used for purification. A leading polysaccharide was purified and characterized as below. The monosaccharide composition of FFP included arabinose (Ara), galactose (Gal), galacturonic acid (GalA) and rhamnose (Rha). The glycosidic linkages were revealed to be L-Ara-(1→, →5)-L-Ara-(1→, →2,4)-L-Rha-(1→, →2)-L-Rha-(1→, →4)-D-Gal-(1→ and D-Gal-(1 → . Nuclear magnetic resonnance (NMR) spectra revealed that FFP had →4)-α-D-Gal p A-(1 → 2)-α-L-Rha p -(1 → as backbone. The side chains included Gal p -β-D-(1 → 4)-Gal p -β-D-(1 → 4)-Gal p -β-D-(1 → 4)-Gal p -β-D-(1→ and α-L-Ara f -(1 → 5)-α-L-Ara f -(1 → . They were linked to C-4 of Rha p . FFP inhibited the production of NO, IL-6 and IL-1β levels induced by LPS. IL-6 and IL-1β levels were returned to normal. These information are helpful to understand this functional fruit.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Liwei Liang,Songlin Cai,Lan Zhang,Ke Sun,Ziying He,Libin Zhang,Ciyuan Huang,Min Long,Hongxiang Zhu,Bingsuo Zou,Tao Liu,Shuangfei Wang
Phenol has various applications in industry, due to its hazardousness, solubility, and volatility, it persists in water and poses a risk to human health. People are excited by the progress of photodegradation technology that facilitates water pollution treatment. The effect of side-chain engineering is proven to enhance photodegradation performance by improving optoelectronic properties. Therefore, here is a strategy that introduces functional groups to change the electron cloud density, achieving excellent optoelectronic properties evidenced by efficient exciton dissociation, separation, and fine-tuned energy level. Subsequently, by coupling of photocatalysis and adsorption, the donor/acceptor (D/A) heterojunction photocatalysts (PBDB-T: BTTIC-TT, PBDB-T: BTTIC-Ph) are designed via loading on coconut-shell carbon to process phenol. The results indicate that the champion photocatalyst PBDB-T: BTTIC-TT possesses superior optoelectronic properties, which can be attributed to the stronger electron-withdrawing ability of thieno[3,2- b ]thiophene than benzene. Consequently, the synergistic efficiency of adsorption and photocatalysis of phenol (10, 20 mg/L) are removed within 10 mins over 90 % which is still valid after twenty cycles. Surprisingly, a high concentration of phenol (100 mg/L) also exhibited excellent removal efficiency of over 80 % within 60 min.
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ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Chenjing Gao,Hongrui Wang,Zaixin Hu,Mingxing Wu
In this study, a novel carbon bead string (CBS) is synthesized through a simple method, which is subsequently introduced into the dye-sensitized solar cells (DSCs) as a cathode catalyst. The resultant CBS cathode displays decent electro-catalytic activities for the traditional iodide redox couple (I 3 − /I − ). More importantly, CBS cathode presents distinct superiorities when applied in an organic sulfide redox couple (T 2 /T − ). T 2 /T − electrolyte-based DSCs with CBS cathode has resulted in a high power conversion efficiency (PCE) of 5.83%, which is much higher than that of Pt cathode-based counterpart (3.71%), demonstrating 57.1% of PCE improvement.
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RSC Advances
·
2017
·Vol. 7
·期 45
·28114-28123
·
IF 3.108
Qiao Wu,Zhiqun Xu,Yunjian Duan,Yincan Zhu,Minrui Ou,Xiaoping Xu
An economical and stabilized immobilized-enzyme method was developed for the removal of phenol in wastewater. Tyrosinase was immobilized on the PAN-based beads with glutaraldehyde as was confirmed successfully by a series of characterizations involving Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). The biodegradation of phenol was investigated by using the immobilized beads and compared to free tyrosinase. The optimum pH and temperature were determined to be 7.0 and 40 °C, respectively. Experiments showed that the immobilized tyrosinase was much more stable than the free tyrosinase in storage and that the immobilized tyrosinase could even retain about 78% of its original activity after repeated use 6 times in a batch system. Furthermore, the comparative in vitro cytotoxicity of phenol/treated solutions were evaluated in LO2 and HepG2 cells by using the CCK-8 assay for cell viability along with flow cytometry detection for apoptosis. The results showed that the toxicity of the phenol solutions only exerted toxicity on cells in a certain concentration range (>0.5 mM for LO2 and HepG2 cells) and that the toxicity of the phenol solutions was greatly decreased after treatment with the tyrosinase-immobilized beads. Thereby, the results confirm that we have established a suitable strategy with promising application to remove phenol economically and efficiently, which could even lower the toxicity of phenol at the cellular level.
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Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 25
·6216-6223
·
IF 5.256
Peiying Li,Zhan Qu,Xin Chen,Xiankuan Huo,Xiucheng Zheng,Dingzhong Wang,Weiping Yang,Lingbo Ji,Pu Liu,Xiujuan Xu
Herein, a soluble graphene-based material exhibiting the aggregation-induced emission (AIE) feature was prepared for the first time via wet chemistry by the chemical reduction of graphene oxide (GO). Moreover, three conjugated polymers containing tetraphenylethylene, carbazole and phenyl groups were used as stabilizers during the reduction of GO in tetrahydrofuran (THF) solution due to the π–π interaction and polymer wrapping effect; the resultant graphene composites containing different amounts of rGO were soluble in organic solvents. Among the three polymers, P1 exhibits the strongest affinity towards rGO, and rGO–P1 in THF solution is stable for months at the concentration of 1.5 mg mL−1. Furthermore, rGO–P1 is AIE-active and its PL intensity is 6.3-fold that of P1 under the same conditions (THF/H2O = 10/90, v/v). The distinguished optical properties and AIE effect of rGO–P1 allow it to act as a chemosensor for the detection of explosives in both the aggregate and solid state with high sensitivity. In the aggregate state, the detectable concentration is as low as 1.3 ppb and the quenching constant is up to 4.16 × 106 M−1, which enable its trace detection of picric acid.
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Analytical Methods
·
2017
·Vol. 9
·期 24
·3675-3681
·
IF 1.9
Qian Liang,Yulin Wang,Fengcai Lin,Maosheng Jiang,Pengfei Li,Biao Huang
Bamboo tar is a water-insoluble semi-solid by-product generated from bamboo charcoal processing. A simple and rapid method to convert bamboo tar into carbon quantum dots (CQDs) was developed by a microwave-hydrothermal route, which was applied to the sensitive and selective detection of 2,4,6-trinitrophenol (TNP) under acidic conditions. The obtained CQDs were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and fluorescence spectroscopy. The results indicate that the CQDs emit strong blue fluorescence centered at 450 nm under the excitation band of 380 nm with a high quantum yield of 19.3%. A sensitive approach has been developed for the detection of TNP in the range of 0.2–20 μM with a detection limit of 33 nM based on the fluorescence resonance energy transfer (FRET), inner filter effect (IFE) and electron transfer (ET) between CQDs and TNP. This approach is highly selective and suitable for TNP analysis in natural water samples.
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ENERGY & FUELS
·
2017
·
IF 3.091
Youan Ji,Yucui Hou,Shuhang Ren,Congfei Yao,Weize Wu
The separation of phenolic compounds from oil mixtures is an important step for further refining or applications of the oil mixtures. In this work, three imidazolium-based dicationic ionic liquids (DILs; 1,2-bis[N-(N′-methylimidazolium)]ethane dibromide, DIL1; 1,3-bis[N-(N′-methylimidazolium)]propane dibromide, DIL2; and 1,4-bis[N-(N′-methylimidazolium)]butane dibromide, DIL3) were synthesized and used to separate phenolic compounds from oil mixtures. The effects of time, temperature, DIL:phenol mole ratio, and initial phenol concentration on separation performance were investigated in detail. It was found that the removal efficiency of phenol followed the order DIL1 < DIL2 < DIL3. DIL3 showed the maximum phenol removal efficiency of 96.6% and the minimum ultimate phenol concentration of 3.9 g/dm3. Initial phenol concentration had little influence on the ultimate phenol concentration. Less than 0.4 in DIL:phenol mole ratio was needed to obtain the highest phenol removal efficiency, and the separation process could be completed within 5 min. These DILs could be reused without a decrease in the removal efficiency of phenol, and the properties of DILs did not change after four cycles. Also, DIL3 was demonstrated to separate phenolic compounds from real coal tar oil with the removal efficiency of 93.1%. Importantly, these DILs showed much smaller solubilities in oil mixtures than monocationic ILs. In addition, these DILs showed higher thermal stabilities than monocationic ILs, which provides a broader range of operation temperature than ever.
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MOLECULES
·
2017
·Vol. 22
·期 5
·859
·
IF 2.861
Yuxue Zhou,Pengfei Lv,Xiangdong Meng,Yanping Tang,Pingping Huang,Xiaobing Chen,Xiaoshuang Shen,Xianghua Zeng
Two-dimensional thin Bi2WO6nanoplates have been fabricated using a cetyltrimethylammonium bromide (CTAB)-assisted hydrothermal method. We investigated the proposed formation mechanism based on the crystalline structures of the thin Bi2WO6nanoplates. The high adsorption ability and excellent visible-light driven photocatalytic activities of the Bi2WO6nanoplates were illustrated, in view of exposed (001) facets of nanoplates possessing faster separation of photo-generated charge carriers and increased catalytically active sites. Such a cost-effective way to obtain Bi2WO6nanoplates offers new possibilities for the design of adsorptive semiconductor photocatalysts with strengthened photocatalytic activities.Keywords:Bi2WO6nanoplates;semiconductor photocatalyst;visible light-driven
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Rui Feng,Zhou Fang,Runxi Zhang,Xiaoyan Hu,Tianbo Li,Wei Zhou,Feifei Yang,Xinlong Yan,Shijian Lu
Direct hydroxylation of benzene to phenol is a more environmentally friendly way to generate phenol compared with the traditional method. This study developed vanadium-modified hollow-structured titanium silicate-1 (TS-1) as a catalyst for the effective hydroxylation of benzene to phenol under moderate conditions using hydrogen peroxide as an oxidant. The synthesis of TS-1 zeolites has been improved using traditional hydrothermal, crystal seed, and dissolution–recrystallization techniques. Compared with conventional TS-1, hollow-structured TS-1 exhibited a higher mesopore volume and surface area. Later, vanadium doping increased the charge density associated with the framework Ti centers and acid site content. In the radical reaction process, the adsorption and activation of benzene on highly reactive Ti–OOH intermediates, as well as the improvement of performances toward benzene hydroxylation to phenol, were facilitated by the increase in the concentration of open active centers and acid and electron characteristics.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jingjing Tang,Hongchao Li,Xuan Zhang,Jieshu Qian,Bingcai Pan
Fe-based metal–organic frameworks (MOFs) have garnered significant attention as catalysts for heterogeneous Fenton reactions, while the limited efficiency of the Fe(III)/Fe(II) redox cycle hinders their widespread use in wastewater treatment. Herein, we successfully incorporated carbon nanotubes (CNTs) into MIL-101(Fe) to modulate the coordination environment of Fe for achieving better catalytic activity. The MIL-101(Fe)/CNTs/H 2 O 2 system shows outstanding performance in degrading various pollutants, with the catalytic activity of the MIL-101(Fe)/CNTs composites (98.8%) significantly surpassing that of MIL-101(Fe) alone (26.4%) or CNTs alone (3.5%). Multiple experimental findings suggest that this synergistic effect is primarily attributed to the C-O-Fe bridge bonds resulting from the interaction of surface carboxyl groups on CNTs with Fe in MIL-101(Fe). This unique coordination structure accelerates the redox cycle of Fe(III)/Fe(II), thereby promoting the generation of hydroxyl radicals (HO • ). Furthermore, the MIL-101(Fe)/CNTs composites demonstrate excellent reusability and stability, maintaining effectiveness over a wide pH range from 3.0 to 6.5. This study provides new insights into regulating the microstructure of Fe-based MOFs to enhance their Fenton catalytic activity.
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