KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2023
·Vol. 40
·期 1
·195-204
·
IF 2.7
Wu Hongdan,Liu Xiaodi,Yang Xiaoyu,Hu Chuanzhi,Zhou Zhihui
Organosilica membranes derived from bis(triethoxysilyl)ethane (BTESE) and tetraethyl orthosilicate (TEOS) were prepared by sol-gel method on porous α -Al 2 O 3 supports and applied in pervaporation dehydration of isopropanol (IPA) aqueous solutions. The permeation characteristics of membranes in IPA/water mixture were evaluated for preparation conditions and stability, including long-term stability, acid resistance, and feed concentration. It was observed that the water contact angle of BTESE/TEOS-derived organosilica membrane decreased from (77.74±0.47)° to (36.67±1.05)° as the content of TEOS increased, which proved that the surface property of the membrane could be changed by the part of hydrocarbon units after hydrolysis condensation reaction. As the molar ratio of BTESE to TEOS was 1 : 2, the organosilica membrane showed high pervaporation performance for 90 wt% isopropanol aqueous solutions at 75 °C, with a water permeation flux of 10.580 kg·m −2 ·h −1 and separation factor of 1170. Stability experiments of long-term operation and acid environment in isopropanol aqueous solutions showed slight changes in flux and separation factor, proving that organosilica membranes had better stability. An increase in IPA concentration from 60 wt% to 90 wt% decreased both water flux and water content on the permeate side, suggesting that the effective pore sizes for permeation could be reduced by adsorption of IPA molecules, whereas the membrane remained high permeance in isopropanol aqueous solutions with high water content. The separation mechanism of pervaporation dehydration of isopropanol aqueous solutions by BTESE/TEOS-derived membrane was mainly attributed to the molecular sieve separation effect. The results showed that the BTESE/TEOS-derived organosilica membranes had an application prospect in the dehydration of aqueous-organic mixtures.
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BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2022
·Vol. 110
·期 1
·1-7
·
IF 2.807
Du Changsheng,Chen Haijun,Gao Weidong,Sun Wu,Peng Lei,Xu Nan
The nano-zero valence iron (nZVI) via green synthesis for heavy metal remediation has attracted many attentions due to its low-cost, environmental-safety, relative reproductivity, and high stability. However, influence of synthesis conditions on the physiochemical properties of nZVI via green tea extracts and the responding suspensibility, which is required for high reactivity, has not been fully elucidated. In this study, we investigated the zeta potentials, sedimentation and lead (Pb 2+ ) removal capacity of various nZVIs synthesized using green tea extracts. The results showed that the tea extracts extracted at 80 o C presented an excellent activity, which contributed to the outstanding suspensibility and reaction activity of nZVI synthesized in a volume ratio of 1:1 (tea extraction versus Fe 2+ solution). Thus, the optimized nZVI was successfully prepared with a Pb 2+ removal capacity (377.3 mg/g), which was seven times stronger than 50.31 mg/g of traditional chemical synthesized nZVI.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2022
·Vol. 49
·期 1
·101-119
·
IF 3.134
Chen Fenghua,Yang Maosen,Shi Xiangdong,Qin Xiaoyun,Chen Qingtao,Jiang Liying,Jia Chunxiao
In order to increase the photocatalytic performance of titanium dioxide mesocrystals (TMCs), in this study, Ag nanoparticles with different mass content were first photodeposited on the surface of as-prepared TMCs to form heterostructured Ag–TMCs catalysts, followed by loading them on g-C 3 N 4 via one step “bottom-to-up” calcination method. The results of photocatalytic degradation toward RhB experiments showed that the prepared ternary photocatalyst of g-C 3 N 4 /Ag–TMCs exhibited excellent photocatalytic activity not only compared with the bare TMCs and Ag–TMCs, but also with all of those reported TiO 2 /Ag/g-C 3 N 4 ternary photocatalysts. Such improved photocatalytic properties were attributed to the synergistic effect created by the LSPR effect and an important role as an electron-conduction bridge of Ag and the existence of heterojunction structure formed between Ag, TMCs and the further coupling g-C 3 N 4 , which added to the evidences that enabled the prepared g-C 3 N 4 /Ag–TMCs catalyst enhanced transfer efficiency of photogenerated carriers and suppressed recombination rate of electron-hole pairs. Moreover, the deposited Ag content had a positive effect on the photocatalytic degradation efficiency. On the basis of the results of this study, the specimen of g-C 3 N 4 /9% Ag–TMCs showed RhB degradation efficiency up to 100% under only 15 min visible-light irradiation. A possible degradation mechanism was also proposed based on several characterizations including photoluminescence spectrum and a serious of photoelectrochemical measurements. Overall, the prepared g-C 3 N 4 /Ag–TMCs ternary photocatalyst with good recyclability looked promising for future practical applications in the visible-light photodegradation of organic pollutants.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 2
·1-12
·
IF 5.7
Zhang Zi-Yang,Xu Yi-Heng,Chen Ke-Yan,Zhang Mei-Hang,Meng Chun-Yan,Wang Xue-Sheng,Wang Man-Man
Benzotriazole UV stabilizers (BUVSs) are a class of emerging contaminants of concern; the development of rapid and convenient monitoring method for these trace-level pollutants in waters is of crucial significance in environmental science. Here, a novel magnetic flower-like molybdenum disulfide/cobalt ferrite nanocomposite (MoS 2 /CoFe 2 O 4 ) was synthesized by hydrothermal reaction. Compared with the conventional Fe 3 O 4 -based magnetic composites, the proposed material just required a minimum consumption of Co/Fe towards the equivalent of MoS 2 while providing superior magnetization performance. Taking advantages of high adsorption capacity, extraordinary stability, and repeatability in construction, MoS 2 /CoFe 2 O 4 was applied to the extraction to BUVSs. The enrichment factors of three BUVSs were in the range 164–193 when 20 mL of environmental water sample was loaded on 40 mg of the adsorbent. MoS 2 /CoFe 2 O 4 could be regenerated and recycled at least 10 cycles of adsorption/desorption with recoveries of 80.1–111%. The method of MoS 2 /CoFe 2 O 4 -based extraction coupled with high-performance liquid chromatography-variable wavelength detector was applied to the monitoring of BUVSs in seawater, lake water, and wastewater, which gave detection limits ( S/N = 3) of 0.023–0.030 ng·mL −1 and recoveries of 80.1–110%. The intra-day and inter-day precisions (relative standard deviation, RSDs, n = 3) were in the range 1.6–7.5% and 3.2–11.5%, respectively. The approach is an alternative for efficient and sensitive extraction and determination of trace-level environmental pollutants in waters. Graphical Abstract
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JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 2
·1-12
·
IF 2.8
Chi Junrui,Zhang Yu,Tu Fanbin,Sun Junchen,Zhi Huizhen,Yang Jinfei
Vegetable oils, as raw materials for polyurethane foam, have attracted much attention for being non-toxic, biodegradable, renewable, and so on. However, polyurethane foam burns extremely easily and the vegetable oil grafted phosphorus/silicon flame retardant polyols alone do have insufficient fire-retardant efficiency. Herein, a new bio-based flame retardant (Polyol-P) was successfully synthesized through a ring-opening reaction by using epoxy soybean oil and phenylphosphonic acid as raw materials. Then, Polyol-P was first combined with melamine-formaldehyde resin-microencapsulated ammonium polyphosphate (MAPP) to modify polyurethane foam. The synergistic flame-retardant effects of Polyol-P with MAPP in polyurethane foam have been studied by thermogravimetric analysis, limiting oxygen index test, vertical burning test, and cone calorimeter. TG test results showed the addition of Polyol-P and MAPP promoted the degradation of polyurethane foam composites and the char residue rate at 800 °C of PU-P/15MAPP was significantly enhanced. Flame retardant test results confirmed PU-P/15MAPP exhibited LOI of 25.8% and passed the V-0 rating in the UL-94 test. Cone calorimeter test results indicated the peak heat release rate of PU-P and PU-P/15MAPP reduced from 395.10 kW/m 2 to 291.92 kW/m 2 and 222.72 kW/m 2 compared with PU-0. Furthermore, the ratio of CO and CO 2 remarkably reduced and the residual carbon yield of PU-P/15MAPP was the highest, and its value was 20.0 wt%. SEM confirmed that the char residue of PU-P/15MAPP was wrinkled and uneven, which was caused by the release of many volatile gases. FT-IR verified the formed structure of the phosphorous-containing carbonaceous structure. These results suggest that Polyol-P and MAPP have a good synergistic flame retardancy on polyurethane composites and can reduce fire risk.
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International Journal of Minerals Metallurgy and Materials
·
2023
·Vol. 30
·期 5
·877-885
·
IF 4.8
Wang Junlian,Liu Lu,Xu Wen,Liu Hui,Xu Guodong,Huang Kun,Yu Fengshan,Huang Guoyong
Platinum group metals (PGMs), especially Pd, Pt, and Rh, have drawn great attention due to their unique features. Direct separation of Pd and Pt from highly acidic automobile catalyst leach liquors is disturbed by various factors. This work investigates the effect of various parameters including the acidity, extractant concentration, phase ratio A/O, and diluents on the Pd and Pt extraction and their stripping behaviors. The results show that the Pd and Pt are successfully separated from simulated leach liquor of spent automobile catalysts with monothio-Cyanex 272 and trioctylamine (TOA). Monothio-Cyanex 272 shows strong extractability and specific selectivity for Pd, and only one single stage is needed to recover more than 99.9% of Pd, leaving behind all the Pt, Rh, and base metals of Fe, Mg, Ce, Ni, Cu, and Co in the raffinate. The loaded Pd is efficiently stripped by acidic thiourea solutions. TOA shows strong extractability for Pt and Fe at acidity of 6 mol·L −1 HCl. More than 99.9% of Pt and all of the Fe are extracted into the organic phase after two stages of countercurrent extraction. Diluted HCl easily scrubs the loaded base metals (Fe, Cu, and Co). The loaded Pt is efficiently stripped by 1.0 mol·L −1 thiourea and 0.05–0.1 mol·L −1 NaOH solutions. Monothio-Cyanex 272 and TOA can realize the separation of Pd and Pt from highly acidic leach liquor of spent automobile catalysts.
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JOURNAL OF FLUORESCENCE
·
2022
·Vol. 33
·期 3
·1111-1123
·
IF 2.525
Zhang Dianwei,Zhang Furui,Wang Shengnan,Hu Sha,Liao Yonghong,Wang Fenghuan,Liu Huilin
Amino- and sulfhydryl- functionalized biomass carbon dots (BCDs) were prepared by one-pot reverse microemulsion for specific recognition of ferric ions (Fe 3+ ) and L-cysteine (L-Cys). Green grapefruit peel was used as the carbon source while aminosilane and mercaptosilane were used as N- and S-supplier. Following the adsorption of Fe 3+ on the surfaces of BCDs-NH 2 and BCDs-SH, the fluorescence responses was quenched step by step, while adding L-Cys to the BCDs-NH 2 /Fe 3+ system restored the fluorescence. The BCDs-NH 2 and BCDs-SH system exhibited extremely low limits of detection for Fe 3+ of 3.2 and 3.0 nM, respectively, within a wide linear ranges of 0.006–200 μM and 0.004–200 μM, respectively. The BCDs-NH 2 /Fe 3+ systems were used as an optosensor for L-Cys in the concentration ranges of 0.08–30 and 30–1000 μM with a detection limit of 65 nM. Developed BCDs-NH 2 and BCDs-SH were able to respond to Fe 3+ in water samples with satisfactory recoveries of 100.1%-103.1% and 94.6%-108.5%, respectively, and the BCDs-NH 2 /Fe 3+ system was also able to respond to BCDs-NH 2 /Fe 3+ in actual lake water samples with recoveries from 87.3% to 98.8%. Meanwhile, The BCDs-NH 2 exhibited good photoluminescence and stability, and the with a fluorescence quantum yield was as high as 25%. This work demonstrates the feasibility of using such materials to remove hazardous ions from water and employing the resulting complexes for optosensing in a sustainable manner.
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CELLULOSE
·
2023
·Vol. 30
·期 5
·3127-3140
·
IF 5.7
Duan Xikai,Li Zhaoqian,Shi Xianrui,Pei Chonghua
It is highly anticipated to explore low-priced raw materials for preparing nitrocellulose (NC). The use of low-priced raw materials reduces environmental pollution while utilizing waste. In this paper, it is fascinating to prepare NC for propellants based on giant panda feces. The synthesis of NC based on giant panda feces and bitter bamboo stems as raw materials were labeled as P-NC and B-NC, respectively. Compared with cotton-based NC (NC12.5%), P-NC has certain advantages in decomposition heat, burning flame and speed, and mechanical properties. However, this advantage is very slight. The gastrointestinal digestion of giant pandas shortens the time for extracting α-cellulose. P-NC and B-NC are very similar in structure and properties, except that P-NC maintains a higher degree of crystallinity. The results show that P-NC can replace cotton-based NC in terms of performance for propellants. It should be emphasized that this paper is based on the use of animal excrement, which not only protects the environment and saves resources, but also reduces the workload of the staff at the giant panda conservation base. In addition, this paper also provides us with a new idea about waste utilization.
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MACROMOLECULAR RESEARCH
·
2023
·Vol. 31
·期 1
·45-52
·
IF 2.4
Zhao Wenqian,Yang Richie,Yang Shengfu,Zhang Kan
We observed an unusual low polymerization temperature for the ortho -amide benzoxazine in comparison with its para -isomer. Density functional theory (DFT) calculations suggested that the intramolecular hydrogen bond between the oxazine ring and the adjacent amide softens the C–O bond, resulting in a reduced activation energy and thus a low ring-opening polymerization temperature. In addition, the polymerization kinetics of both para - and ortho -amide functional benzoxazines were investigated using the Starink method, which confirmed a relatively lower activation energy for the ortho -amide functional benzoxazine compared with its para -isomer. Our work suggests that softening chemical bonds by intramolecular hydrogen bonding may become a new strategy for the design of high-performance polybenzoxazine thermosets with low processing temperatures. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 3
·1026-1043
·
IF 4.5
Chen Sen,Shi Qianru,Liu Hui
As a typical two-dimensional MXene material with abundant oxygen-containing functional groups, Ti 3 C 2 could be used as an excellent carrier for noble metal nanoparticles to effectively avoid its agglomeration. However, Ti 3 C 2 was easily oxidized and deteriorated when stored in a conventional environment, so polydopamine (PDA) was used to modify Ti 3 C 2 to promote uniform loading of noble metal nanoparticles. Based on this, with Ti 3 AlC 2 as the raw material and PDA as the modifier, in situ growth of gold nanoparticles was carried out using chloroauric acid trihydrate as the precursor, and the target nanocomposite catalyst (Au@P-Ti 3 C 2 ) was then obtained. A sequence of characterizations were employed to analyze chemical structure of the resulting catalyst. The catalytic degradation performances of Au@P-Ti 3 C 2 toward amaranth, methylene blue, chrome black T, and Congo red were systematically investigated, and the results showed that catalytic degradation percentage of Au@P-Ti 3 C 2 for the above dyes could reach 100%. The pseudo-first-order kinetic model could be used to simulate the catalytic reaction process well, and catalytic reaction rate constants of Au@P-Ti 3 C 2 (2) for the four pollutants were 0.0411 s −1 , 0.0721 s −1 , 0.0273 s −1 , and 0.0105 s −1 , respectively. After 10 cycles of repeated catalysis, catalytic degradation percentage of the composite catalyst toward the four dyes could still remain above 89%. Therefore, this novel, green, and simple method to synthesize Ti 3 C 2 -based composite catalyst might provide extremely valuable application prospect for MXene-based catalyst in the field of harmless treatment of industrial dyes. Graphical Abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 11
·29494-29509
·
IF 5.19
Zhao Panpan,Wang Yan,Yang Qiankun,Yu Guili,Ma Fenfen,Dong Jingquan
This study aims to investigate the effects of environmentally relevant concentrations of abamectin on the cardiac function of carp and the potential mechanisms. Here, male carp were exposed to abamectin, and cardiac function-related enzymatic markers were examined. Cardiac histopathology, redox equilibrium, inflammation, and cell death were evaluated. Abamectin exposure caused cardiac dysfunction by upregulating lactate dehydrogenase (LDH), aspartate aminotransferase (AST), creatine kinase (CK), creatine Kinase MB isoenzyme (CK-MB) and white blood cells (WBCs), and decreasing red blood cells (RBCs) and hemoglobin (Hb). DHE staining and biochemical assays revealed that abamectin caused ROS release and oxidative stress by inhibiting Nrf2-ARE pathway. Histopathological and real-time fluorescence quantitative PCR (RT-qPCR) assays revealed that abamectin caused myocardial fiber swelling and inflammatory cell infiltration, enhanced pro-inflammatory cytokines tumor necrosis factor-α ( Tnf-α ), interleukin-1 beta ( Il-1β ), and Il-6 levels and attenuated anti-inflammatory cytokines Il-10 and transforming growth factor beta 1 ( Tgf-β1 ) through activating NOD-like receptor family, pyrin domain containing 3 (NLRP3) inflammasome and nuclear factor kappa-B (NF-κB) pathway. Tunel staining showed that abamectin triggered cardiac apoptosis via activating p53 -mediated mitochondrial apoptosis with elevated bcl2-associated X ( Bax ), reduced B-cell lymphoma-2 ( Bcl-2 ), and activated Caspase-9 and Caspase-3 . Immunoblot analysis revealed that abamectin activated autophagic flow by inhibiting mammalian target of rapamycin ( mTOR ), resulting in the conversion of LC3B from LC3-I to LC3-II, elevation of autophagy protein 5 ( Atg5 ), and reduction of p62 . Overall, abamectin caused cardiac dysfunction in carp via inhibiting redox equilibrium and resulting in immune inflammatory response and programmed cell death.
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Waste and Biomass Valorization
·
2022
·Vol. 14
·期 6
·1891-1903
·
IF 3.449
Li Yuanzhang,Xu Tingting,Lin Changqu,Xiong Hao,Bai Zhongzhong,Wu Hongli,Cao Fei,Wei Ping
Traditional Chinese Herb Residues (TCHRs) contain a large number of lignocellulosic components, such as glucan (cellulose/starch), hemicellulose, and lignin, which can be fully utilized to avoid resource wasting and environmental pollution. Herein, we chose 40 typical TCHRs to measure their lignocellulosic contents and degraded the TCHRs containing high dextran components to prepare glucose or anhydro-sugars. The average lignocellulosic content of 40 typical TCHRs was 71.48 ± 13.30% and 25 TCHRs’ lignocellulosic contents were more than 70%. Based on the lignocellulosic content and ratio of total structural carbohydrates to lignin content, 40 typical TCHRs can be divided into four categories for sugar-producing, bio-char forming, composting, and incineration. 11 TCHRs were screened for glucose preparation by enzymolysis or acidolysis, and anhydro-sugars preparation in polar aprotic solvents. The average yield of glucose from 7 starch-rich TCHRs was 87.3% by enzymolysis, and the average yield of glucose from 4 cellulose-rich TCHRs was 58.0% by acidolysis. The total carbon yield of anhydro-sugars from 7 TCHRs was over 60%. These results and classification principles have instructive significance for discharging and utilizing TCHRs. Graphical Abstract
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危险品化学品经营许可证（带存储）