JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2017
·
IF 3.154
Yafu Tang,Xinying Wang,Yuechao Yang,Bin Gao,Yongshan Wan,Yuncong C. Li,Dongdong Cheng
In this work, lignite, a low-grade coal, was modified using the solid-phase activation method with the aid of a Pd/CeO2 nanoparticle catalyst to improve its pore structure and nutrient absorption. Results indicate that the adsorption ability of the activated lignite to NO3–, NH4+, H2PO4–, and K+ was significantly higher than that of raw lignite. The activated lignite was successfully combined with the polymeric slow-release fertilizer, which exhibits typical slow-release behavior, to prepare the super large granular activated lignite slow-release fertilizer (SAF). In addition to the slow-release ability, the SAF showed excellent water-retention capabilities. Soil column leaching experiments further confirmed the slow-release characteristics of the SAF with fertilizer nutrient loss greatly reduced in comparison to traditional and slow-release fertilizers. Furthermore, field tests of the SAF in an orchard showed that the novel SAF was better than other tested fertilizers in improve the growth of young apple trees. Findings from this study suggest that the newly developed SAF has great potential to be used in apple cultivation and production systems in the future.
研究领域:
农业科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Zi-Chun Fan,Zhuang Li,Xian-Yong Wei,Qian-Qian Kong,Zhong-Qiu Liu,Li Li,Jia-Hao Li,Fan Yin,Kun-Lang Lu,Zhi-Min Zong
Catechol (CC) and hydroquinone (HQ) featured with toxicity and wide application are regarded as organic pollutant in wastewater, so the detection of CC and HQ is very important. Besides, direct use of low-rank lignite for combustion is not only wasteful, but also leads to increased greenhouse gas production. Hence, its efficient and clean utilization accords with the process of social development and the concept of carbon neutrality. Based on the above two problems, a method of killing two birds with one stone was proposed to solve the clean utilization of lignite and be used to detect CC and HQ. Herein, a series of porous carbons derived from Longquan lignite with well-developed microporous and mesoporous structure were fabricated by pyrolysis, carbonization, and activation under various activation temperatures (600–900 °C). This combination of microporous and mesoporous structures can increase the surface area (3113 m 2 /g) and the active site of the porous carbon, improve its electrical conductivity and electron transport efficiency, and make it as a substrate for constructing electrochemical sensor (ECS) with excellent electrocatalytic activity, and successfully be applied in simultaneous detection of CC and HQ. Compared with some reported results, the prepared ECS exhibits satisfactory electrochemical sensing performance with wider linear concentration range and lower detection limits of 0.16 μM for CC and 0.16 μM for HQ, which is comparable to graphene-based sensors. Furthermore, the ECS possesses good stability, reproducibility, selectivity, and anti-interference, and shows practical applicability in environmental water samples.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Xiao-Yan Zhao,Xue-Yu Ren,Yan-Jun Wang,Jing-Pei Cao,Zi-Meng He,Nai-Yu Yao,Hong-Cun Bai,Hou-Luo Cong
Direct conversion of lignite into light aromatics via catalytic fast pyrolysis is a great challenge because of severe catalyst deactivation and low aromatics yield. The tandem catalysis (1Zn@MCM-41 and ZSM-5) system was employed to promote the conversion of thermally-derived volatiles of lignite into aromatics at 600 °C. The mesoporous Zn-incorporated MCM-41 (xZn@MCM-41) with different doping amount of Zn was prepared with a one-pot hydrothermal procedure. The structure and the dispersion of Zn species of 1Zn@MCM-41 were systematically studied with XRD, SEM, BET, NH 3 -TPD and so on. The presence of 1Zn@MCM-41 significantly expands the lifetime of the microporous ZSM-5. Meanwhile, the yield of aromatics, especially benzene, is also increased to some extent. The content of the long-chain hydrocarbons and the phenolic compounds are decreased significantly after being cracked by the mesoporous 1Zn@MCM-41. More small molecules are able to contact with the active sites located in the micropores of ZSM-5 with the presence of Zn@MCM-41. In addition, the ZSM-5 in the tandem catalysts system presents an excellent stability. Therefore, this meso -microporous tandem catalysis system promotes the preferential cracking of macromolecular compounds, the cracked small molecules generated from which then contact with ZSM-5 to produce aromatics. This work provides a new perspective for the gradient catalyzing lignite-derived volatiles over a tandem catalysis system.
研究领域:
能源化学
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催化科学
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产品关联
DOI
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 43
·e202303563
·
IF 2.1
Chong Liang,Wei Zhao,Xutang Liu,Fei Wang,Zhijie Jiang
Graphical This attractive work examines the changes in CAs selectivity when lignite is oxidized by H 3+n [PMo 12-n V n O 40 ] (HPA-n, n=1-5) and discloses the catalytic mechanism of HPA. The catalytic process of HPA follows the electron transfer-oxygen transfer (ET-OT) mechanism, where it not only activates lignite through electron transfer, but also activates oxygen, leading to the generation of active substance ⋅OH in water. The ⋅OH promotes the breakage of lignite. Although the oxidation of lignite has been extensively studied, the factors affecting the selectivity of carboxylic acids (CAs) are unclear. This attractive work examines the changes in CAs selectivity when lignite is oxidized by H 3+n [PMo 12-n V n O 40 ] (HPA-n, n=1-5) and discloses the catalytic mechanism of HPA. The results show that the selectivity of benzene polycarboxylic acids and acetic acid (AA) increases with increasing vanadium content of HPA-n, such as mellitic acid and benzenepentacarboxylic acid from 0.8 % and 3.0 % to 5.4 % and 16.2 %, respectively. Consequently, the differences in the concentration of HPA or H 2 SO 4 used to obtain optimal formic acid and AA yields confirm that the intrinsic properties of CAs calculated by Gaussian 09 can also affect their selectivity. HPA can not only activate lignite through electron transfer, but also further activate oxygen, leading to the generation of active substance ⋅OH in water. Consequentially, ⋅OH as the key reactive substance can promote the breakage of bridge bonds, side chains and condensed aromatic rings during HPA-catalyzed oxidation of lignite. Thus, the oxidation pathway of lignite over HPA is proposed. This work constructs a relationship between oxidation capacity and CAs selectivity and discloses the lignite oxidation pathway at the molecular level, which is a significant progress in HPA-catalyzed conversion of lignite.
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Zi-Chun Fan,Xiang Bai,Xian-Yong Wei,Xing Fan,Yierxiati Dilixiati,Zhuang Li,Qian-Qian Kong,Ji Zhao,Li Li,Jia-Hao Li,Zhi-Min Zong
The efficient and clean utilization of low-rank lignite conforms the strategy of carbon neutral development. Herein, a two-step strategy of hard template method and co-precipitation method was designed to prepare nickel nanoparticles supported on mesoporous carbon (Ni x /MPC) using the residue from the ethanolysis of Longquan lignite for quantitative detection of p -nitrophenol (NP). The electrochemical reduction properties of modified glassy carbon electrodes (GCEs) with different nickel loadings ( x = 10, 15, and 20 wt%) for NP were compared, in which Ni 15 /MPC/GCE stood out and presented better conductivity, larger electrochemical active surface area, and faster electron transfer rate. According to the differential pulse voltammetry detection results, Ni 15 /MPC/GCE displays satisfactory detection limit (1.8 µM) and far wider detection concentration range (170 ∼ 10000 µM) than other reported electrochemical sensors. Moreover, Ni 15 /MPC/GCE exhibits acceptable stability and reproducibility, and the relative standard deviation of NP detection current is only 0.71% under the interference of 100-fold concentration interfering substances. Hence, the constructed Ni 15 /MPC/GCE demonstrates a promising electrochemical sensor for detecting NP in environmental sewage.
研究领域:
环境科学
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材料科学
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分析化学
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产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Suqian Gu,Zhiqiang Xu,Yunxiang Dai,Yang Chen,Yangguang Ren,Yanan Tu,Le Yang,Mengyun Shi
Coal gasification wastewater (CGW) as a substitute for clean water to prepare coal water slurry, which serves as gasification/combustion feedstock, can simultaneously achieve wastewater management and resource utilization. The purpose of this work was to investigate the effects of internal components (i.e., oils, phenols, nitrogen heterocyclic compounds, and inorganic cations) in CGW on the slurryability and dispersion/aggregation behavior of lignite and their co-slurrying mechanisms through experimental and the extended DLVO (eDLVO) theoretical calculations. Results showed that compared to lignite water slurry (LWS), the maximum solids concentration ( ω max ) of coal gasification wastewater slurry (CWWS) increased by 0.80%, with a lower pseudo-plasticity. The organic compounds adsorbed competitively on the hydrophobic regions of lignite improved the slurrying capability of CWWS by decreasing the wettability, Zeta potential, roughness and pore structure of the particles. By contrast, the static stability of CWWS decreased, and its kinetic stability index ( TSI ) increased from 0.23 to 0.33. From the backscattering spectra, dodecane caused the creaming process of the slurry, while the clarification process was attributed to phenol and nitrogen heterocyclic compounds. Inorganic cations, especially NH 4 + and Ca 2+ , significantly reduced the hydrophilic and negative charges on the particle surface, which were the main unfavorable factors leading to particle aggregation and sedimentation. The eDLVO theoretical calculation results exhibited that inter-particle interaction in CWWS was determined by the hydrophobic energy ( E h ) and electrostatic energy ( E e ) and their dropped from 1.79 × 10 −16 J and 5.16 × 10 −17 J to −4.67 × 10 −16 J and 2.59 × 10 −17 J respectively.
研究领域:
环境科学
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能源工程
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DOI
高影响因子
TALANTA
·
2024
·
IF 5.6
Yukun Huang,Guangyu Chen,Biao Fu,Yingfu Si,Peng Li,Yijun Cao,Lingkun Rong,Chunjie Zhao
This study developed a rapid and efficient graphite furnace digestion combined with inductively coupled plasma emission spectrometry (ICP-OES) method, enabling precise quantification of germanium (Ge) in coal and various coal-derived metallurgical byproducts across a broad concentration level (∼ppm-n%). The graphite furnace digestion conditions were examined intensively as a function of the acid amounts of HNO 3 and HF (5–10 mL), temperature (80–180 °C), time (1–5 h), and acid drive methods (H 3 BO 3 neutralization versus heating). Coal references including SARM 19, SARM 20, NIST SRM 1632e, and fly ash standard NIST SRM 2689 were tested. The optimum recovery of germanium was obtained when the HNO 3 dosage, HF dosage, solid sample mass, temperature, and duration time were 10 mL, 5 mL, 0.1 g, 80 °C and 1 h. Agreement of 95.15–96.54 % between the measured and certified value was obtained under the optimum conditions. The spiked recovery was 103.23–103.54 %, indicating the matrix-analytes interactions were negligible. Boric acid neutralization reduced the recovery rates to 47.2–49.3 % and was not be appropriate for driving HF. The optimal spectral line for determining Ge is at a wavelength of 265.117 nm, at which the limit of detect and the limit of quantification were 0.46 μg L −1 and 1.53 μg L −1 , respectively. The applicability of the method was validated by quantifying Ge in Ge-rich lignite, fly ashes (FA), and chlorinated distillation residue (CR) samples. The concentration of Ge in coals was 44.75–225.41 μg g −1 , the content in FA was 0.68%–2.3 %, and the content in CR was 0.18 %, with the uncertainty of the method obtained being less than 0.5 %. X-ray fluorescence spectrometer (XRF) was used to verify the results. The difference between XRF data and ICP-OES data was less than 5 %, confirming the accuracy and reproductivity of the analytical method.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
POWDER TECHNOLOGY
·
2023
·
IF 5.2
Xuan Liu,Jie Gong,Kai Jiang,Xiaojuan Lai,Yu Tian,Kang Zhang
In order to reduce the apparent viscosity of lignite coal water slurries (CWSs) and improve its static stability, a series of three-arm amphiphilic block copolymers have been prepared through RAFT polymerization by using poly(ethylene glycol) methyl ether acrylate (PEGMA) and sodium 4-vinylbenzenesulfonate (SSNa) as hydrophilic monomers and styrene (St) as hydrophobic monomer. The chemical structure of the copolymers has been investigated, and the impact of relative molecular weight, hydrophilic/hydrophobic ratio, and ionic group content on the pulping performance of three-arm amphiphilic block copolymers has been examined. The lignite coal water slurries (CWSs) prepared from the block copolymer tri -P(St 50 - s -SSNa 50 ) 10K - b -PPEGMA 10K exhibit a remarkably low apparent viscosity of 395 mPa·s and excellent static stability when the coal content is at 55 wt% and dispersant content is at 0.5 wt%. Moreover, these CWSs can achieve a maximum pulping concentration of up to 59 wt%. Additionally, the thermogravimetric test reveals insights into the water occurrence in CWSs, indicating that higher levels of free water content correspond to lower apparent viscosities. Suitable hydrophobicity facilitates the removal of internal water from lignite by dispersants, disrupting its flocculation structure and promoting CWSs formation. Meanwhile, the presence of ionic groups enhances the static stability of the resulting CWSs. Furthermore, the adsorption behavior of the three-arm amphiphilic block copolymer dispersant in lignite has been analyzed through XPS testing to elucidate its dispersion mechanism. The use of three-arm amphiphilic block copolymers in preparing lignite CWSs results in lower apparent viscosity and improved static stability, attributed to the amphiphilic and steric hindrance effects of dispersants. This not only expands the application range of lignite CWSs but also highlights the significant potential of this type of dispersant.
研究领域:
聚合物化学
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材料科学
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能源工程
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化工工程
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DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 22
·12737-12746
·
IF 3.049
Tian Qiu,Jian-Guo Yang,Xue-Jie Bai,Yu-Ling Wang
Herein, synthetic graphite materials with hierarchical pores and large specific surface area were successfully prepared by one-step impregnation with lignite as the carbon source, sulfuric acid (H2SO4) as the oxidant, and phosphoric acid (H3PO4) as the activator. The microstructural characteristics of synthetic graphite were investigated via X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Moreover, the pore parameters were studied by nitrogen adsorption–desorption. The results showed that synthetic graphite had a perfect orderly layered structure with high graphitization degree and a well-developed multistage pore structure with pore sizes ranging from nanometer to micrometer. The specific surface area and pore volume were 415.29 m2 g−1 and 0.67 cm3 g−1, respectively. The results of Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) showed that the impregnation pretreatment provided polar groups containing oxygen to the surfaces. These unique characteristics make synthetic graphite possess good adsorption capacity for dye pollutants (the adsorption rate of the methyl orange solution was 99.9% within 60 min at 50 °C, and the pH value of the solution was 3). The effects of temperature and pH value on the adsorption capacity were studied. The repeatability of the adsorption performance was also tested, and the adsorption rate was 84.6% of the initial adsorption rate after five cycles.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2024
·
IF 5.8
Xue-Yu Ren,Jing-Pei Cao,Ming-Wen Ma,Xiao-Yan Zhao
We have created a self-assembly method to synthesize the mesoporous structure (SBA-15 and MCM-48) in micro-ZSM-5 by a seed induced crystallization. The micro/mesoporous MCM-48@Z5 composite display the complement effect of micro/mesopores structure in the aromatic yield and coke deposits during catalytic fast pyrolysis of lignite towards aromatics, compared to SBA-15@Z5. Impressively, the mesoporous MCM-48 from the epitaxial growth of ZSM-5 crystal achieved the high alkyl-substituted aromatics in the upgraded tar. By contrast, the developed mesopores in SBA-15@Z5 composites presented the low content of aromatics owing to insufficient acidity. Moreover, from the analysis of the coke nature and composition deposited on the spent zeolites, it can be found that the coke species possessed the light species ( i.e. , benzene, naphthalene and it’s derivatives) and heavy species ( i.e. , long-chain aliphatics), similarly to the coke species on ZSM-5. The coke growth strongly depends on the polymerization on the surface area during catalytic fast pyrolysis of lignite towards aromatics, despite more mesopores on catalysts.
研究领域:
化学工程
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能源材料科学
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产品关联
DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2024
·
IF 5.6
Shu-Ting Hu,Yue-Lun Wang,Qing-Gang Wang,Han-Bing Gao,Wen-Jie Gu,Wei-Hua Zhao,Yun-Peng Zhao,Jing-Pei Cao,Lin-Jun Zhu
The introduction of in situ hydrogen donors to obtain a high H/C eff ratio is an effective way to upgrade coal pyrolysis volatiles to light aromatics. In this study, the influence of different in-situ hydrogen suppliers in catalytic reforming of coal pyrolysis vapors was explored. The abilities of active hydrogen donation were greatly corresponded to structures of hydrogen donors. Isopropanol showed the best catalytic performance due to the release of a large amount of active α-H as a result of negative inductive effect of hydroxyl. Whereas tertbutanol showed the poorest catalytic performance owing to the lack of α-H. Meanwhile, the effect of in-situ hydrogen production via steam reforming with different alcohols on light aromatic yields was investigated. The highest BTEXN yield was obtained under in-situ hydrogen production from isopropanol steam reforming. Two circumstances of hydrogen supply were further compared. Relatively higher BTEXN yield was presented in the reaction of methanol steam reforming than that of using methanol solely. However, higher BTEXN yield was contrarily obtained from sole isopropanol as a hydrogen donor despite lower H 2 production was gained compared to the case of isopropanol steam reforming. The fact was probably ascribed that high electron-withdrawing effect of hydroxyl for isopropanol promoted the cleavage of α-C-H bond and favored the transfer of active hydrogen to reactants over acid sites.
研究领域:
化学工程
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能源科学
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DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2022
·
IF 6.437
Zhong-Qiu Liu,Guo-Qiang Zhang,Xin Huang,Yuan-Yuan Yu,Yu-Jing Liu,Anguo Ying
The precise synthesis of multifunctional poly(ionic liquid)s (MFPILs) featuring basic sites, mesoporous channels, and hydrophobicity continues to be a substantial challenge. Moreover, the directional conversion of lignite to monocyclic arenes (MCAs) is highly attractive but particularly challenging on account of its geometrical complexity and chemical inertness. The efficiency of lignite directional conversion to MCAs over solid bases is substantially decreased by the presence of water molecules leading to the deactivation and leaching of basic sites. Herein, the novel solid bases, i.e. , MFPILs with dibasic sites, unique hydrophobicity , and abundant mesoporous channels, were successfully fabricated by a radical multicomponent cross-linked copolymerization for the first time. Even more excitedly, the resulting MFPILs were demonstrated to be very efficient for directional catalytic hydroconversion of extraction residue from Dahuangshan lignite (DL ER ) into MCAs with 32.3 wt% yield, which is by far the highest value reported for lignite-derived MCAs by solid bases under similar conditions. The synergistic catalysis, i.e. , hydrophobic microenvironment, mesoporous confinement, and synergistic effect of dibasic sites, for active hydrogen transfer of DL ER conversion into MCAs over MFPILs is confirmed by characterization methods. The work not merely sheds substantial light on developing the novel solid bases, but also exhibits a potentially powerful catalyzing strategy to synthesize MCAs.
研究领域:
催化化学
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高分子化学
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能源材料
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可持续化学
·
有机转化
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DOI
高影响因子
危险品化学品经营许可证（带存储）