Bioresource Technology Reports
·
2018
·
IF 0
Hao Li,Zhiling Liu
Hydrodeoxygenation (HDO) is one of the most promising technologies for the biomass pyrolysis oil upgrading, but substantial challenges for the development of efficient HDO catalysts still remain. In this work, the nickel catalysts supported on carboxylic carbon nanotube (Ni/CCNTs-X, X = 1, 2, 3, 4 and 5) with different diameter have been synthesized for the HDO of model compound (vanillin) to p -creosol. As the tube diameters of Ni/CCNTs-X catalysts increased, the catalytic activity increased firstly, and then decreased. The conversion of vanillin over Ni/CCNTs-4 catalyst reached up to 90.0% under mild reaction condition, with a concomitant 87.7% selectivity of p -creosol. The transformation pathway for the HDO of vanillin over Ni/CCNTs-X catalysts involve in hydrogenation, hydrogenolysis and etherification .
研究领域:
催化化学
·
能源化学
·
生物质转化
·
可再生能源
·
环境化学
✓ 已验证
DOI
Analytical Methods
·
2017
·Vol. 9
·期 47
·6669-6674
·
IF 1.9
Hui Huang,Jiao Li,Mengxian Liu,Zizhun Wang,Bingdi Wang,Meini Li,Yongxin Li
A novel multifunctional semiconducting polymer dot (Pdots)/pyrogallic acid (PA) system was successfully established for fluorescence sensing of urea, urease, and pesticides. The Pdots/PA system was pH controllable, emitting strong fluorescence at pH 6.0. However, in an alkaline environment, PA transformed into its quinone structure, which is an efficient fluorescence quencher, resulting in fluorescence quenching of the Pdots/PA system. Furthermore, urea was hydrolyzed in the presence of urease, releasing hydroxyl groups that transformed PA into its quinone structure, resulting in fluorescence quenching of the Pdots/PA system. Therefore, a sensitive detection method for urea and urease was developed. The limits of detection for urea and urease were 0.02 mM and 0.08 U L−1, respectively. Pesticides, such as dimethoate, were able to inhibit the urease activity, resulting in recovery of the fluorescence intensity of the Pdots/PA system. Therefore, the fluorescence turn-on detection of pesticides could be also achieved. A satisfactory result was obtained when using the system to detect pesticides in fruit and vegetable samples.
研究领域:
分析化学
·
生物传感器
·
环境监测
·
食品安全
·
分子探针
·
酶学
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2015
·Vol. 10
·期 1
·1-7
·
IF 2.779
Wu Shufen,Yan Songjing,Qi Wei,Huang Renliang,Cui Jing,Su Rongxin,He Zhimin
We demonstrated a facile and environmental-friendly approach to form gold nanoparticles through the reduction of HAuCl 4 by aspartame. The single-crystalline structure was illustrated by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The energy-dispersive X-ray spectroscopy (EDS) and Fourier transform infrared (FTIR) results indicated that aspartame played a pivotal role in the reduction and stabilization of the gold crystals. The crystals were stabilized through the successive hydrogen-bonding network constructed between the water and aspartame molecules. Additionally, gold nanoparticles synthesized through aspartame were shown to have good catalytic activity for the reduction of p -nitrophenol to p -aminophenol in the presence of NaBH 4 .
研究领域:
纳米科学与技术
·
环境化学
·
材料化学
·
催化化学
·
绿色化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2018
·
IF 4.358
Zhaocheng Zhang,Dongyang He,Haiyang Liu,Miao Ren,Yanan Zhang,Jiao Qu,Nan Lu,Jiunian Guan,Xing Yuan
Black phosphorus (BP), a superior two-dimensional (2D) semiconductor, has attracted much attention due to its unique properties. The graphene (GR)-BP hybrid was synthesized through one pot chemical vapor transport (CVT) approach. The characterization results indicated that P atom was successfully incorporated into GR by the formation of P-C bond. Remarkably, the newly-synthesized GR-BP represented high photocatalytic activity towards 2-chlorophenol (2-CP) degradation, due to the high efficiency of charge separation and transformation caused by the direct band gap of BP and carrier mobility of GR. The removal efficiency for 2-CP reached up to 87.08% within visible light irradiation for 180 min ( λ > 420 nm). The degradation rate of GR-BP hybrid for 2-CP was approximately 7.29-fold than that of BP within 30 min. In addition, the little increasing of the peak for P-O bond in GR-BP hybrid was observed after being exposed in air for 15 days, meant that the stability of BP was significantly enhanced. It was caused by the decreasing of the oxidation sites in BP due to the formation of P-C bond in hybrid. In brief, our synthetic method for GR-BP not only provides a novel route for the improvement of the stability of BP, but also constitutes an insight into the promising practical application of BP in the photocatalysis field.
研究领域:
材料科学
·
纳米科技
·
光催化
·
半导体材料
·
环境化学
✓ 已验证
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2021
·
IF 2.775
Zhendong Wang,Shuo Chen,Bingxiao Feng,Hongbing Song,Meng Xiao,Hengjun Gai,Tingting Huang
Extracting phenol from coal tar has great economic significance. In this paper, a process for separating phenol from coal tar using mono-ethanolamine (MEA) as extractant was proposed, the conceptual design and optimized of the process was carried out by using Aspen Plus software. To ensure the accuracy of simulation, the vapor-liquid equilibrium data of MEA + phenol binary system were measured under different pressures. The binary interaction parameters of NRTL model, Wilson model and UNIQUAC model were fitted with the experimental data by data regression system. The results show that the deviation of NRTL model is less than that of Wilson model and UNIQUAC model. Considering that the boiling point difference between MEA and phenol is only 10°, two energy-saving schemes of double effect distillation are introduced into the conceptual process proposed in this paper, which can save 20% and 44.8% respectively compared with the traditional single tower distillation process . This paper provides reference for the industrial application of MEA in the extraction of phenol from coal tar.
研究领域:
化学工程
·
分离科学
·
热力学
·
能源化工
·
工业催化
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2018
·Vol. 25
·期 2
·1-13
·
IF 1.434
Cheng Chuanjie,Li Jin,Yang Fanghong,Li Yupeng,Hu Zhongyu,Wang Jinglan
A novel small molecule 1,3-bis(eugenyl) glycerol diether is synthesized from renewable eugenol and epichlorohydrin in 60% total yield, and its structure is confirmed by 1 H–NMR spectrum. Then, this small molecule is utilized to prepare oligomer, linear polymer and the corresponding crosslinked polymer (denoted as P
2
) by using thiol-ene and thiol-oxidation reactions. The polymer P
2
can form brown film on a glass substrate and can be easily put off from the substrate. Mechanical properties of P
2
show that tensile strength value is about 6 MPa, with elongation at break of around 300%. Glass transition temperature (Tg) of P
2
is −2.76 °C, meaning that P
2
is at rubber state. There are hydroxyl groups in the prepared linear polymer, which further reacts with 1,6-hexanediisocyanate (HDI) to form polyurethane P
4
with crosslinked structures. Compared with P
2
, the polyurethane P
4
forms yellow film on a glass substrate. But the film of P
4
is not so flexible as that of P
2
, presumably because of relatively higher Tg (5.85 °C) of P
4
than P
2
. Due to the existence of dynamic disulfide bonds as well as hydrogen bonds in both P
2
and P
4
, these thermoset resins show repeatable self-healing behavior stimulated by UV irradiation. Furthermore, the polyurethane P
4
exhibits ultrahigh temperature resistance performance, with Td 5 = 375 °C and Td 10 = 1000 °C according to TGA curve. This work is expected to expand research and potential applications of the renewable resource eugenol in preparation of smart materials.
研究领域:
高分子材料
·
绿色化学
·
智能材料
·
功能材料
·
自修复材料
✓ 已验证
DOI
高影响因子
Canadian Journal of Chemistry
·
2020
·Vol. 98
·期 5
·
IF 1.171
Keke Ning,Guoqiang Xiang,Cuicui Wang,Jingxing Wang,Xiaohong Qiao,Ruofei Zhang,Xiuming Jiang,Lijun He,Wenjie Zhao
In this work, poly(sodium 4-styrenesulfonate) (PSS) modified molybdenum disulfide quantum dots (MoS2-PSS QDs) were synthesized via a simple hydrothermal method using l-cysteine and anhydrous sodium molybdate as precursors and PSS as a modification reagent, and a selective and sensitive fluorescent sensing method for the determination of p-nitrophenol (p-NP) based on their UV emission was developed. The obtained MoS2-PSS QDs have an obvious UV emission peak (390 nm) with quantum yield of 5.13%. The strong absorption peak of p-NP at 400 nm has large spectral overlap with the UV emission peak (390 nm) of MoS2-PSS QDs. Because of this p-NP absorption, the fluorescence of MoS2-PSS QDs at 390 nm is quenched with the introduction of p-NP via the inner filter effect (IFE) and the decreased fluorescence intensity was linearly proportional to the p-NP concentration in the range of 1–20 μmol/L, leading to a detection limit of 0.13 μmol/L for p-NP. The MoS2 QDs-based fluorescent probe for p-NP is sensitive and selective and was successfully applied in the determination of p-NP in the pond water samples with satisfactory results.
研究领域:
分析化学
·
材料科学
·
环境监测
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2024
·Vol. 26
·期 19
·14194-14204
·
IF 2.9
Jianhua Zheng,Yiming Gao,Bingbing Wang,Zhenping Guan,Guangming Yin,Heshan Zheng,Yong Li,Xiangyu Cao,Shunji Zheng
Constructing Z-scheme heterojunctions incorporating an exquisite hollow structure is an effective performance regulation strategy for the realization of high quantum efficiency and a strong redox ability over photocatalysts. Herein, we report the delicate design and preparation of a core–shell hollow CdS@CoTiO3 Z-scheme heterojunction with a CdS nanoparticle (NP)-constructed outer shell supported on a CoTiO3 nanorod (NR) inner shell. The in situ growth synthetic method led to a tightly connected interface for the heterojunction between CdS and CoTiO3, which shortened the transport distance of photoinduced charges from the interface to the surface. The promoted charge carrier separation efficiency and the retained strong redox capacity caused by the Z-scheme photoinduced charge-transfer mechanism were mainly responsible for the boosted photocatalytic performance. Additionally, the well-designed core–shell structure afforded a larger interfacial area by the multiple direction contact between CdS and CoTiO3, ensuring sufficient channels for efficient charge transfer, and thus further boosting the photocatalytic activity. As an efficient photocatalyst, the optimized CdS@CoTiO3 nanohybrids displayed excellent 2,4-dichlorophenol (2,4-DCP) and tetracycline (TC) degradation efficiencies of 91.3% and 91.8%, respectively. This study presents a Z-scheme heterojunction based on ecofriendly CoTiO3, which could be valuable for the development of metal perovskite photocatalysts for application in environmental remediation, and also demonstrated the tremendous potential of integrating a Z-scheme heterojunction with the morphology design of photocatalyts.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Qi Han,Wenyi Dong,Hongjie Wang,Tongzhou Liu,Yu Tian,Xin Song
This study systematically investigated the degradation of tetrabromobisphenol A (TBBPA) by ferrate (VI) oxidation. The reaction kinetics between ferrate (VI) with TBBPA were studied under pseudo-first-order conditions in the pH range 5.5–10.5. Then, a series of batch experiments were carried out to investigate other factors, including the ferrate (VI) dosage, temperature and interfering ions. Additionally, the generation of inorganic products (bromide ion and bromate) was evaluated. The organic intermediates were identified, and possible pathways were proposed. In addition, the toxicity variation was analyzed with marine luminous bacteria ( V. fischeri ). Degradation of TBBPA by ferrate (VI) oxidation was confirmed to be an effective and environmentally friendly technique. The reaction was fitted with a second-order rate model. With a ferrate (VI) dosage of 25.25 μmol/L, TBBPA concentration of 1.84 μmol/L, an initial pH of 7.0, and a temperature of 25 °C, a 99.06% TBBPA removal was achieved within 30 min. The evaluation of inorganic products showed that the capacity of ferrate (VI) oxidation to yield bromide ions was relatively strong and could prevent the formation of bromate compared to photocatalytic and mechanochemical techniques. Eleven intermediates were identified, and the proposed degradation pathway indicated that TBBPA might undergo debromination, beta scission , substitution, deprotonation and oxidation. The results of toxicity testing showed that ferrate (VI) could effectively control the toxicity of the treated samples, although the toxicity increased in the initial reaction stage due to the accumulation and destruction of more toxic intermediates.
研究领域:
环境科学
·
化学工程
·
毒理学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Pei Gao,Zhijie Liang,Zhiwei Zhao,Wenhao Wang,Chun Yang,Bibo Hu,Fuyi Cui
In this study, the phenyl-modified mesoporous materials were successfully synthesized using phenyl-organosilanes (trimethoxyphenylsilane and triethoxyphenylsilanea) by one-pot co-condensation method for the removal of estrone (E1), 17β-estradiol (E2), and 17α-ethinyl estradiol (EE2). Both the triethoxyphenylsilane-modified material (20%EtPh-MCM-41) and trimethoxyphenylsilane-modified material (20%MePh-MCM-41) could rapidly achieve equilibrium in 30 min at low adsorbent dosage of 0.025 g L −1 . But the different hydrolysable groups of trimethoxyphenylsilane and triethoxyphenylsilane led to the discrepancies in physicochemical properties of the 20%EtPh-MCM-41 and 20%MePh-MCM-41, and thus affected adsorption performance. The 20%EtPh-MCM-41 exhibited the faster estrogen adsorption rates expressed in pseudo-second-order kinetic constant than the 20%MePh-MCM-41 due to the more hydrophobicity . Conversely, the 20%MePh-MCM-41 had much more estrogen adsorption capacities than the 20%EtPh-MCM-41 because of the more available adsorption sites. The addition of the phenyl-organosilane improved estrogen adsorption by π-π and hydrophobic interactions, and the Langmuir-model-based maximum adsorption amounts could reach 99.02, 83.47, and 53.60 mg g −1 for EE2, E2, and E1, respectively. But excessive concentration of phenyl-organosilane decreased adsorption capacities due to poor pore structure. Alkaline solution, which induced estrogen deprotonation and negative surface charge of absorbents, inhibited estrogen adsorption by electrostatic repulsion and the decreased hydrophobic interaction, but acidic and neutral solutions, ionic strength, and humic acid did not significantly affect estrogen removal. This work not only showed the high potential of trimethoxyphenylsilane-modified MCM-41 used in water purification for steroid estrogens, but also demonstrated the suitable selection of organosilane precursors was key in producing favorable materials with designed functionality.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 103
·84410-84422
·
IF 3.84
Hai-Min Shen,Gong-Yuan Zhu,Wu-Bin Yu,Hong-Ke Wu,Hong-Bing Ji,Hong-Xin Shi,Yi-Fan Zheng,Yuan-Bin She
Renewable β-cyclodextrin (β-CD) was immobilized onto the surface of hybrid silica using ethylenediamine as linking groups to construct an adsorbent in water treatment (CD@Si), and the obtained CD@Si was characterized through FT-IR, XPS, EDX, contact angle measurement, TGA, solid-state 13C NMR, SEM, and XRD analyses. The effect of initial pH, contact time on the adsorption performance of CD@Si for p-nitrophenol, and the adsorption kinetics, adsorption isotherms, adsorption thermodynamics, reusability and adsorption mechanism were investigated systematically, which indicate that the adsorption of p-nitrophenol onto CD@Si is a very fast process. The adsorption equilibrium can be reached in 15 s with an acceptable equilibrium adsorption capacity of 69.6 mg g−1 at pH 7.0, which is much faster than many reported adsorbents based on β-CD. The adsorption of p-nitrophenol onto CD@Si follows the pseudo-second-order model, obeys the Freundlich model, and is a feasible, spontaneous, and exothermic process which is more favorable at lower temperatures. And the formation of an inclusion complex and a hydrogen bond interaction are two origins of p-nitrophenol being adsorbed onto CD@Si. Additionally, CD@Si can be recycled and reused for at least five runs with an acceptable adsorption capacity, and is a very promising adsorbent for the fast adsorption of p-nitrophenol or its analogues from the aqueous phase. Additionally, this work also provides a strategy to increase the adsorption rate of adsorbents based on β-CD.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 25
·17771-17779
·
IF 3.9
Tao Lu,Wei Fang,Qian Zhou,Mengjuan Liu,Guozhang Wu
This study aims to synthesize a specific type of polycarbonate with high refractive index, low birefringence, and resistance to hygrothermal aging by copolymerizing 2,2′-bis(2-hydroxyethoxy)-1,1′-binaphthyl (BNE) with 9,9-bis[4-(2-hydroxyethoxy)phenyl]fluorene (BPEF). Comparative analysis revealed that the copolymer synthesized from BNE and BPEF demonstrated superior hydrolytic stability relative to the bisphenol A-based polycarbonate. This augmented stability can be attributed to the monomers' higher pKa values, rendering acidic substances less capable of dissociating and thereby mitigating ester hydrolysis under hygrothermal conditions. Furthermore, the investigation probed into the phenomenon of physical aging in copolymerized polycarbonate when exposed to hygrothermal environments. It was discerned that the enthalpy loss, observable under both dry and hygrothermal conditions, could be linearly correlated with the difference between the aging temperature and the glass transition temperature (Tg), signifying a close correlation between the magnitude of physical aging and Tg. A lower Tg in the copolymerized polycarbonate led to more pronounced physical aging within the same timeframe, resulting in an augmentation of tensile strength and modulus, while higher Tg effectively mitigated the physical aging phenomenon.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）