Surfaces and Interfaces
·
2024
·
IF 5.7
Yijun Wang,Mei Li,Zhiliang Jin,Shiyong Xu,Ziyu Li,Meijuan Ding
Coal tar pitch-based carbon quantum dots (CQDs) were meticulously prepared via ball milling. Ag 3 PO 4 /Ni-MOF/CQDs composites were synthesized through an in-situ precipitation method, and their performance as composite catalysts for the photocatalytic degradation of phenol was thoroughly investigated. Among these composites, Ag-Ni-70/CQDs-0.45 emerged as the most effective catalyst, achieving a remarkable degradation rate of 98% for 10 mg/L phenol within just 30 min, with a corresponding rate constant of 0.0620 min −1 . Notably, the photocatalytic degradation of phenol exhibited robust activity across a spectrum of pH levels, different water matrices, and varying concentrations of anions (SO 4 2− , Cl − , CO 3 2− , HPO 4 2− and HCO 3 − ). Furthermore, after undergoing 4 cycles of reaction, the catalyst demonstrated commendable stability. The outcomes of free radical capture experiments revealed that the primary active species involved in the degradation process were ·OH and h + . The electron transport pathways were analyzed based on the band gap structure of the catalyst, and a possible degradation mechanism was proposed. Upon the combination of Ni-MOF and Ag 3 PO 4 , the alteration of metal-O bonds facilitated the formation of a tightly bonded interface, thereby establishing a Z-scheme heterojunction. The introduction of CQDs as an electron transport medium accelerated electron transfer, mitigated the recombination of photogenerated charges, and thereby enhanced the photocatalytic performance of the heterostructure.
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INTERNATIONAL BIODETERIORATION & BIODEGRADATION
·
2025
·
IF 4.1
Qingyun Li,Shaohui Yan,Zhengfeng Jiang,Liang Xian,Jianjia Du,Haibo Liu,Youyan Liu
Cyanide and phenol are highly toxic chemicals that exert severe inhibitory effects on microorganisms, posing significant challenges for their removal by biological methods in coexistent systems. In this study, we successfully isolated a bacterial strain named JF101, identified as Alcaligenes faecalis , which was capable of degrading both cyanide and phenol. The interactions between cyanide and phenol during biodegradation were investigated. It was found that the presence of 100 mg/L cyanide significantly enhanced the degradation of phenol, leading to the complete degradation of 1000 mg/L phenol within 86 h. In contrast, only 21.9% of phenol was degraded in the absence of cyanide. Additionally, the presence of phenol had minimal impact on cyanide degradation; a concentration of 100 mg/L cyanide could be rapidly and completely degraded within 40 min even in the presence of up to 1000 mg/L phenol. Five empirical kinetic models of Haldane, Aiba, Edward, Yano, and Webb were employed to describe the degradation processes of phenol and cyanide in both single-substrate and dual-substrate systems. The putative degrading enzymes, degradation products, and pathways associated with the co-degradation of cyanide and phenol were systematically analyzed. The formamide and NH 4 + -N produced from the rapid degradation of cyanide served as nitrogen sources, facilitating the resumed growth of strain JF101 and enhancing phenol degradation.
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ACS ES&T Water
·
2024
·
IF 4.8
Jiaxuan Yang,Nuo Cheng,Hesong Wang,Meng Zhang,Jialong Chen,Tianyi Wang,Han Zhang,Jinlong Wang,Langming Bai,Heng Liang
The freshwater resource scarcity and emerging contaminants in municipal wastewater pose challenges to the sustainability of wastewater reuse and environmental remediation technologies based on membranes. Herein, we propose a cobalt ferrite-modified carbon nanotube (CoFeCNT) activated peroxymonosulfate (PMS) pretreatment, improving secondary effluent purification and alleviating membrane fouling. Based on the effect of hydroxyl radicals, sulfate radicals, and singlet oxygen, CoFeCNT/PMS efficiently removes various emerging organic contaminants. Moreover, this process exhibits an excellent degradation performance on secondary effluent organic matter (EfOM), such as dissolved organic carbon (38.61%), absorbance at 254 nm (97.25%), and fluorescence intensity (above 80%), reducing the fouling load of membrane influent. CoFeCNT/PMS effectively mitigated the membrane fouling from EfOM, with reversible and irreversible fouling reduced by more than 80%. The membrane fouling mode of CoFeCNT/PMS is between intermediate and standard blocking, and the filtration volume entering the cake layer fouling mode increases compared with membrane filtration alone. The polar acid–base microscopic interactions on the membrane surface dominate the production of the free energy barrier (948.60 × 10–6 mJ), which can effectively slow down the dense fouling layer formation. These findings provide a promising strategy for wastewater remediation and membrane fouling mitigation.
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ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Fei Wang,Xingyu Liu,Chennan Guo,Fei Lian,Zimeng Li,Meiyan Wang,Binbin Sun,Wenling Wu,Hongwen Sun
Low activation performance is a critical issue limiting the practical application of low-cost biochar in the advanced oxidation . Given the high potential of transition metals in the persulfate activation process and abundant oxygen-containing groups of hydrochar , hydrochar derived from cobalt (Co)-modified iron (Fe)-enriched sludge was synthesized and its performance and activation mechanism for the degradation of triclosan were investigated. Co modification significantly altered the morphology of hydrochar, and the increased Co–Fe mass ratios transformed hydrochar from granular to rose-shaped lamellar and then to helical sheet structures. Specific surface area, defect degree, and oxygen-containing groups of hydrochar increased with increasing cobalt-iron mass ratios. The highest removal of triclosan was up to 98% in the hydrochar/peroxymonosulfate (PMS) system under a wide range of pHs (3–10) and still remained higher than 90% after four cycles. Both Radical (mainly hydroxyl radical) and nonradical pathways (singlet oxygen and electron transfer) were evidenced to play roles in the triclosan removal. Fe 3+ promoted the regeneration of Co 2+ and realized the efficient circulation of Co 3+ /Co 2+ . A ternary system consisting of electron donor (triclosan)-electron mediator (hydrochar)-electron acceptor (PMS) provided channels for electron transfer . No measurable Co and Fe were released during the reaction, and the toxicity of degradation intermediates was lower than that of triclosan. Beside triclosan, rhodamine B, bisphenol A, sulfamethoxazole, and phenol were also almost degraded completely in this oxidation system. This study provides a promising way for the enhancement of catalytic activity of carbonaceous material.
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PubMed
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PROCESS BIOCHEMISTRY
·
2024
·
IF 3.7
Jiejing Zhang,Chong Hu,Yu Wu,Jing Liang,Cesar Danilo Valle Exposito,Jianfeng Zhang
Isolating high-performance phenol degradation microorganisms with high salt tolerance and studying their resistance mechanisms are urgent issues. To address these issues, a typical bacteria ( Klebsiella sp. YP-1) with high salt and phenol tolerance was isolated. Its strategies for resisting high salt and high phenol stress were studied. The results indicated that Klebsiella sp. YP-1 was able to degrade 1000 mg/L phenol within 44 h at 70 g/L NaCl, which was faster than most microorganisms reported in the literature. Lyxose secreted by Klebsiella sp. YP-1 played an important role on assisting Klebsiella sp. YP-1 to resist stress. Lyxose increased phenol degradation rate by microorganisms due to its protection on cell membrane. Quantum chemical calculation results indicated that lyxose was more likely attacked by free radical than cell membrane. In addition, lyxose could bind to the cell membrane through hydrogen bonds. Thus, lyxose prevented reactive oxygen species from harming cell membranes. Moreover, lyxose has broad protective effect on microbial cell membranes. This study provides a novel idea for microorganisms to resist oxidative stresses.
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ADVANCED MATERIALS
·
2024
·Vol. 36
·期 38
·2405887
·
IF 27.4
Jin Hu,Ming-Jian Jing,Yu-Ting Huang,Bo-Han Kou,Zheng Li,Yi-Tong Xu,Si-Yuan Yu,Xierong Zeng,Jie Jiang,Peng Lin,Wei-Wei Zhao
Reproducing human visual functions with artificial devices is a long-standing goal of the neuromorphic domain. However, emulating the chemical language communication of the visual system in fluids remains a grand challenge. Here, a “multi-color” hydrogel-based photoelectrochemical retinomorphic synapse is reported with unique chemical-ionic-electrical signaling in an aqueous electrolyte that enables, e.g., color perception and biomolecule-mediated synaptic plasticity. Based on the specific enzyme-catalyzed chromogenic reactions, three multifunctional colored hydrogels are developed, which can not only synergize with the Bi 2 S 3 photogate to recognize the primary colors but also synergize with a given polymeric channel to promote the long-term memory of the system. A synaptic array is further constructed for sensing color images and biomolecule-coded information communication. Taking advantage of the versatile biochemistry, the biochemical-driven reversible photoelectric response of the cone cell is further mimicked. This work introduces rich chemical designs into retinomorphic devices, providing a perspective for replicating the human visual system in fluids.
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CATALYSIS SURVEYS FROM ASIA
·
2024
·
IF 2.1
Zhou Hantao,Feng Shangzhen,Yang Jie,Jiang Huanjin,Zhang Xing,Chen Jixiang
Zeolites (Hβ, HZSM-5 and HM), TiO 2 and ZrO 2 supported NiCo alloy catalysts were tested for the hydrodeoxygenation of phenol in aqueous phase. It has been found that the catalyst acidity remarkably influences the catalyst activity and the product distribution. Zeolites supported catalysts give much higher yield of the deoxygenated products (mainly benzene and cyclohexane) than NiCo/TiO 2 and NiCo/ZrO 2 , where cyclohexanol and cyclohexanone are dominating. Associated with NH 3 -TPD, we suggest that the catalyst acidity promotes the hydrodeoxygenation. Hβ zeolite supported NiCo alloy is more active than others, attributed to its higher metal dispersion and more acid sites. Therein, the Hβ zeolite calcined at 750 o C has moderate acidity, and its supported NiCo alloy catalyst (NiCo/HB-750) shows the best performance. Under a suitable reaction condition, the phenol conversion and the total yield of deoxygenated products reaches 96.8% and 94.5% on NiCo/HB-750, respectively.
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ENERGY
·
2025
·
IF 9.4
Xiaohua Li,Zhitao Lei,Yu Cao,Shanshan Shao,Shiliang Wu
The cycloketones were prepared efficiently via the selectively hydrogenation of aqueous phase lignin-derived single phenolic monomer and mixtures. The yield and selectivity of cycloketones was greatly improved over Br modified metal-acid mixed catalyst (PdH5@Br). First, the effect of side-chain functional structures on the aqueous-phase hydrogenation of phenols with Pd/C catalysis was investigated and it was found that the benzene ring with methyl group attached is more easily hydrogenated, and the phenolic hydroxyl side chain was more susceptible to form carbonyl than methoxy groups. A large number of enols existed, thus the catalyst acidity was adjusted by extra addition of HZSM-5, over which the yield of cycloketones from guaiacol was significantly boosted to 67.9%. Subsequently, the electronic properties of catalyst were altered by adding Br over Pd catalyst, weakening the over-chemisorption of intermediate phenol, and the hydrogenating of phenol under PdH5 were enhanced, thus an increased yield of cycloketone of 18.4% occurred. After the hydrotreating of guiaiacol for 2 h at 523 K and 2 MPa H 2 , the yield of cycloketone reached 80.4% on PdH5@Br. The hydrotreating performance of PdH5@Br with lignin-derived phenolic monomer mixtures as the feedstock was also tested, and it presented great universality and stability. It provides an efficient catalyst system and promising technological ideas for biomass hydrotreating.
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FOOD HYDROCOLLOIDS
·
2024
·
IF 11
Zhili Sheng,Hui Liu,Bailin Li,Hong Zhu,Yueming Jiang,Bao Yang
Huangqi (Astragalus membranaceus root) is a widely recognized functional food with impressive health benefits. The primary biomacromolecules in A. membranaceus , polysaccharides, are hypothesized to contribute to these health advantages. However, the precise structure and bioactivity of these polysaccharides remain unclear. In this study, the predominant water-soluble polysaccharides were extracted from A. membranaceus root. A homogeneous fraction with molecular weight of 42.0 kDa, designated APS-I, was purified. The monosaccharides of APS-I comprised arabinose and galacturonic acid in a molar ratio of 34:21. The precise structure of APS-I was elucidated by using nuclear magnetic resonance spectroscopy (NMR) and tandem mass spectrometry (MS). The backbone was identified to be α-(1 → 4)-D-galacturonan, which was substituted at O-3 by α-L-Araf-(1→ [5)-α-L-Araf-(1] n → and α-L-Araf-(1→, respectively. This confirmed it as an arabinogalacturonan. The immunomodulatory activity of APS-I was assessed by using macrophage cells. Our findings indicated that arabinogalacturonan could induce NO, IL-6, TNF-α and IL-1β production, demonstrating their potential as an immunoregulatory compound. Notably, TLR4 receptor was involved in the regulation of immune response and may be a target for APS-I.
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POLYMER
·
2024
·
IF 4.1
Liuchun Zheng,Xuedong Lv,Yongjun Zhang,Yi Liu
Due to the shortage of fossil resource and pollution problems caused by traditional non-degradable polymers, biodegradable polyesters attract increasing interest. Poly(butylene succinate) (PBS) has good biodegradation characteristics, relatively high melt temperature, excellent thermal stability and processing properties. However, its unique chemical structure renders it possesses relatively lower glass transition temperature ( T g ), insufficient mechanical properties. In this work, novel aliphatic cyclic rigid monomer (2,2,4,4-tetramethyl-1,3-cyclobutanediol (CBDO) was introduced into the macromolecular chain of PBS to improve the mechanical properties of PBS. The resulting copolyesters (PBCBS) show T g ranging from −34.7 to −25.6 °C. Tensile tests showed that theses polymers possess high tensile strength (44-29 MPa) and elongation at break as high as 450 %, which is prominently higher than that of commercial PBS and most biodegradable packaging materials. The novel copolyesters were studied by wide-angle X-ray diffraction analysis. It has been found that the introduction of CBDO reduces the crystallization ability of PBCBS and the main reason for this phenomenon is that the aliphatic ring restricts the mobility of macromolecular chains and regular stacking. As crystallinity is reduced, more water molecules can enter into the amorphous region, contact with the ester group bonds, and accelerate the degradation. In addition, the transparency at 700 nm for PBCBS can reach 95 % and it showed better solvent resistance as compared to polycarbonate. The biodegradable polyesters with satisfied combined performance were reported in this work.
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CATALYSIS LETTERS
·
2015
·Vol. 145
·期 10
·1830-1836
·
IF 2.307
Zhou Yan,Huang Wei,Chen Xiang-Shu,Song Zhi-Bin,Tao Duan-Jian
Abstract Several tetramethylguanidinum-based ionic liquids (TMGILs) were prepared, characterized and used as catalysts in one-pot synthesis of flavanones. The results indicated that TMGILs composed of phenolate anion was beneficial for one-pot synthesis of flavanones, and [TMG][4-MeO–PhO] induced the good yields of flavanones owing to the electron-donating effect of methoxy substituent on phenolate anion. Furthermore, [TMG][4-MeO–PhO] was found to be used repetitively at least five times without obvious decrease in activity and quantity. Graphical Abstract
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ChemCatChem
·
2015
·Vol. 7
·期 16
·2485-2492
·
IF 4.556
Guangyue Xu,Jianhua Guo,Ying Zhang,Yao Fu,Jinzhu Chen,Longlong Ma,Qingxiang Guo
Graphical Phosphate aids palladium: A highly reactive, selective, compatible, stable and low-cost catalytic system for selective hydrogenation of phenol to cyclohexanone is described, which consists of well-dispersed Pd nanoparticles anchored to the hydroxylapatite surface that supports the specificity through its basic sites. The production of pure cyclohexanone under mild conditions over catalysts with high reactivity, selectivity, compatibility, stability, and low cost is still a great challenge. Here we report a hydroxyapatite-bound palladium catalyst (Pd–HAP) to demonstrate its excellent performance on phenol hydrogenation to cyclohexanone. Based on catalyst characterization, the Pd nanoclusters (≈0.9 nm) are highly dispersed and bound to phosphate in HAP. Only basic active sites on HAP surface are detected. At 25 °C and ambient H 2 pressure in water, phenol can be 100 % converted into cyclohexanone with 100 % selectivity. This system shows a universal applicability to temperature, pH, solvent, low H 2 purity, and pressure. The catalyst reveals high stability to be recycled without deactivation or morphology change; and Pd nano-clusters barely aggregate even at 400 °C. During the reaction, HAP adsorbs phenol, and Pd nanoclusters activate and spillover H 2 . The mechanism is also investigated, proposed, and verified.
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