SCIENCE OF THE TOTAL ENVIRONMENT
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2022
·
IF 10.753
Zhihao Chen,Bingfeng Lin,Yingping Huang,Yanbiao Liu,Yonghong Wu,Rui Qu,Cilai Tang
Biochar (BC) derived from orange peels was modified using LaCl 3 to enhance its tetracycline (TC) adsorption capacity. SEM-EDS, FT-IR, XRD, and BET were used to characterize the physiochemical characteristics of La-modified biochar (La-BC). Batch experiments were conducted to investigate the effects of several variables like pyrolysis temperature, adsorbent dosage, initial pH, and coexisting ions on the adsorption of TC by La-BC. XPS and density functional theory (DFT) were used to elucidate the TC adsorption mechanism of La-BC. The results demonstrated that La was uniformly coated on the surface of the La-BC. The physiochemical characteristics of La-BC highly depended on pyrolysis temperature. Higher temperature increased the specific surface area and functional groups of La-BC, thus enhancing its TC adsorption capacity. La-BC prepared at 700 °C (BC@La-700) achieved the maximum adsorption capacity of 143.20 mg/g, which was 6.8 and 4.6 times higher than that of BC@La-500 and BC@La-600, respectively. The mechanisms of TC adsorption by La-BC were most accurately described by the pseudo-second-order kinetic model. Furthermore, the adsorption isotherm of La-BC was consistent with the Freundlich model. BC@La-700 achieved good TC adsorption efficiencies even at a wide pH range (pH 4–10). Humic acid significantly inhibited TC adsorption by La-BC. The presence of coexisting ions (NH 4 + , Ca 2+ , NO 3 − ) did not significantly affect the adsorption capacity of La-BC, particularly BC@La-700. Moreover, BC@La-700 also exhibited the best recycling performance, which achieved relative high adsorption capacity even after 5 cycles. The XPS results showed that π-π bonds, oxygen-containing functional groups, and La played a major role in the adsorption of TC on La-BC. The result of DFT showed that the adsorption energy of La-BC was the greatest than that of other functional groups on biochar. Collectively, our findings provide a theoretical basis for the development of La-BC based materials to remove TC from wastewater.
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高影响因子
Minerals
·
2022
·Vol. 12
·期 6
·665
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IF 2.818
Xiaofang Zhang,Yuhuan Li,Yang He,Debin Kong,Bern Klein,Shenghua Yin,Hongyu Zhao
Adsorption with activated carbon (AC) is an important method for the treatment of heavy metal wastewater, but there are still certain challenges in the separation and reuse of activated carbon. The preparation of magnetic activated carbon (MAC) by modifying AC is one of the effective means to realize the separation of AC from solution after the adsorption process. In this work, lignite and poplar leaves were used as raw materials for co-pyrolysis, and the co-pyrolysis char was activated and modified to prepare MAC. The structure and properties were characterized by VSM, N2adsorption, SEM, XRD, and FT-IR. At the same time, the adsorption performance of MAC on wastewater containing Pb and Cd ions was studied. The results show that the prepared MAC contains Fe3O4, and the saturation magnetization (Ms) of the MAC is 13.83 emu/g; the specific surface area of the MAC is 805.86 m2/g, and the micropore volume is 0.23 cm3/g; the MAC exhibited a good porous structure. When the pH value of the solution was 5, the adsorption time was 120 min, the dosage of MAC was 4 g/L, the initial concentration of Pb ion solution was 50 mg/L, and that of Cd ion solution was 25 mg/L, and the adsorption temperature was 30 °C, the adsorption efficiency of Pb, Cd ions were 84.40 and 78.80%, respectively, and the adsorption capacities were 10.55 and 4.93 mg/g, respectively. The adsorption of Pb and Cd ions by MAC conforms to the Langmuir adsorption model, which is a monolayer adsorption. The adsorption process is mainly chemical adsorption, which can be better described by the pseudo-second-order model. The adsorption thermodynamic analysis showed that the adsorption of Pb and Cd ions by MAC was a spontaneous reaction, and the higher the temperature, the stronger the spontaneity.Keywords:lignite;poplar leaves;magnetic activated carbon;heavy metal ions;adsorption mechanism
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2023
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IF 6
Mengqian Yin,Dongmei Bi,Wenjing Zhao,Jing Liu,An Zhao,Mei Jiang
The production of nitrogen-containing chemicals from renewable biomass under nitrogen-rich conditions represents a promising technological pathway. Urea, as a nitrogen carrier, offers advantages over gaseous ammonia due to its easier storage and transportation. In this study, cellulose and two of its model compounds (cellobiose and glucose) were used as raw materials. The effects of different urea concentrations on the types and relative contents of bio-oil components and the properties of nitrogen-doped biochar were analyzed using GC-MS, FT-IR, and elemental analysis . We further clarified the evolution of exogenous nitrogen in nitrogen-rich pyrolyzed bio-oil and biochar with different urea concentrations. Cellobiose was found to be a more suitable feedstock for the production of nitrogen-containing compounds from nitrile than cellulose or glucose. A significant increase in the relative content of nitrile compounds (44.45%) was observed at a ratio of 40% cellulose to nitrogen carrier. Analysis of the bio-oil fraction led to the conclusion that there may be two main pathways for the production of the two nitrile compounds, acetonitrile and propionitrile . This research provides a better understanding of the N transfer pathways during the nitrogen-rich pyrolysis of cellulose and its model compounds (cellobiose and glucose) when using urea as the nitrogen carrier. This will facilitate further improvements in the yield of nitrogen-containing compounds in bio-oil.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xing Yuan,Lingquan Meng,Chaohe Zheng,Haibo Zhao
Perovskites have been recognized as affordable substitutes for noble-metal catalysts for their tunable catalytic activity and thermal stability. Nevertheless, the highly demanding synthesis procedure still hinders the application of perovskites in catalytic combustion. In this work, a series of nanostructured SiTiO3 perovskites with B-site partial substitution by Co, Fe, Mn, Ni, and Cu are synthesized via flame spray pyrolysis in one step. The comprehensive characterizations on textural properties of nanostructured perovskites reveal that the flame-made perovskite nanoparticles all exhibit high crystal purity and large specific surface area (∼40 m2/g). Furthermore, the highest catalytic activity is achieved by SrTi0.5Co0.5O3 due to the formation of favorable oxygen vacancies, outstanding reducibility, and oxygen desorption capability. Additionally, the presence of 10 vol % water vapor during long-term testing indicates remarkable durability and water resistance. Finally, the CO oxidation and CH4 dehydrogenation on SrTiO3 incorporating Co atoms are more thermodynamically and kinetically favorable than those on other doped surfaces.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
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IF 9.4
Lu Zhang,Ling-Ling Liu,Jiu-Ju Feng,Ai-Jun Wang
Three-dimensional (3D) hollow carbon is one of advanced nanomaterials widely applied in oxygen reduction reaction (ORR). Herein, iron niobate (FeNb 2 O 6 ) nanoparticles supported on metal-organic frameworks (MOFs)-derived 3D N -doped interconnected open carbon cages (FeNb 2 O 6 /NICC) were prepared by methanol induced assembly and pyrolysis strategy. During the fabrication process, the evaporation of methanol promoted the assembly and cross linkage of ZIF-8, rather than individual particles. The assembled ZIF-8 particles worked as in-situ sacrificial templates, in turn forming hierarchically interconnected open carbon cages after high-temperature pyrolysis. The as-made FeNb 2 O 6 /NICC showed a positive onset potential of 1.09 V and a half-wave potential of 0.88 V for the ORR , outperforming commercial Pt/C under the identical conditions. Later on, the as-built Zn-air battery with the FeNb 2 O 6 /NICC presented a greater power density of 100.6 mW cm −2 and durable long-cycle stability by operating for 200 h. For preparing 3D hollow carbon materials, this synthesis does not require a tedious removal process of template, which is more convenient than traditional method with silica and polystyrene spheres as templates. This work affords an exceptional example of developing 3D N -doped interconnected hollow carbon composites for energy conversion and storage devices.
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高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2024
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IF 5.8
Jiajia Ma,Zhiheng Ye,Jie Zhou,Zhong-Ting Hu,Qianqian Wang,Junliang Wang,Zhiyan Pan,Mian Hu
In this study, the influences of soybean straw (SS) to spirulina platensis (SP) mass ratios and pyrolysis temperature on the evolution properties of N-containing species in pyrolytic tri-products and the nitrogen migration mechanism and involved chemical reactions during the co-pyrolysis processes were comprehensively investigated. Results indicated that co-pyrolysis of SS ang SP significantly facilitated the transformation of nitrogen into N bio-oil and N char from N gas . Increasing the amount of SP led to a decrease in the concentration of NH 3 and HCN in N gas , while their concentrations increased gradually with temperature increasing. NH 3 and HCN formation was due to H radicals attacking the N-sites of N-heterocyclic, with NH 3 formation being more strongly influenced by this process. Regarding N char , increasing the ratio of SP enhanced nitrogen incorporation reactions and promoted formation of pyridinic-N and pyrrolic-N. Conversely, decreasing the ratio of SP enhanced hydrogenation and condensation reactions, which favored the formation of quaternary-N. With increasing temperature, protein-N decomposed significantly, while pyridinic-N, pyrrolic-N, and quaternary-N remained stable. Additionally, pyridinic-N can convert to quaternary-N at temperature > 500 °C. Increasing the SP ratio greatly decreased oxygenates content while increased that of N-containing compounds in N bio-oil . The content of heterocycle-N (34.31 %) and nitriles (9.22 %) in bio-oil peaked at a ratio of 1:3, attributed to SP promoted the condensation and diazotization cyclization reactions. Furthermore, increasing the reaction temperature (from 400 to 800 °C) significantly increased the yields of heterocycles-N, while the yields of amines and amides decreased sharply due to dehydration reaction. As analyzed above, the possible nitrogen migration mechanism and involved chemical reactions were elucidated. These findings provides insights for generating high value-added N-containing chemicals and N-doped carbon materials during N-rich pyrolysis.
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MICROPOROUS AND MESOPOROUS MATERIALS
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2024
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IF 4.8
Mengkun Luan,Xiangjie Lei,Yu Fan
To increase the yield of light olefins during the catalytic pyrolysis of alkanes, a novel hierarchical Fe-incorporated ZSM-5 molecular sieve (FeM-Z5) was synthesized using an Fe-based metal-organic framework (Fe-MOF) as a mesoporogen and iron source through the dry gel conversion (DGC) method. In contrast to the conventional method of incorporating Fe species into ZSM-5 via impregnation, the DGC method incorporates Fe species into the framework of ZSM-5, decreasing the amount of Brønsted (B) acid sites and thereby inhibiting the side reactions of hydrogen transfer during the catalytic pyrolysis of alkanes. Compared with the FeN-Z5 catalyst prepared by the DGC method with Fe(NO 3 ) 3 as an iron source, FeM-Z5 had a larger amount of strong B acid sites and more mesopores with a size range of 10–40 nm originating from the decomposition of Fe-MOF; these aspects improved n-pentane pyrolysis and ethylene and propylene diffusion. As a result, the optimal FeM-Z5 catalyst exhibited the highest yield of ethylene and propylene (33.4 wt%) and the lowest deactivation rate (0.07 %/h) among the prepared catalysts during the catalytic pyrolysis of n-pentane.
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TRIBOLOGY INTERNATIONAL
·
2017
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IF 2.903
Wangji Shang,Tao Cai,Yunxiao Zhang,Dan Liu,Shenggao Liu
All carbon hybrids containing carbon quantum dots (CQDs) and graphene oxide (GO) have been prepared via one pot pyrolysis of citric acid (TDCA). Their relationships between microstructures, compositions and tribological peformance have been investigated. The TDCA as lubricants in PEG synthetic lube base oil exhibited remarkable friction-reducing in boundary lubrication . Importantly, the anti-wear enhanced significantly with increased loads, while the friction-reduction performance increased slightly. The excellent tribological performance is due to the synergistic effect of sphere-like CQDs and GOs absorbed on the sliding surface, Moreover, the high load induced more TDCA deposited on interface and the carbons inclined to degrade and generate more ordered structure, which protected interface better against undesirable friction and wear.
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高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Qian Zhou,Bingxiao Feng,Lining Hao,Chao Pan,Hongbing Song,Hengjun Gai,Quanhong Zhu,Meng Xiao,Tingting Huang
The removal of oil from coal pyrolysis wastewater persists to be a challenging problem. Thus, this study proposes a new scheme that integrates the adsorption of oil using fibers and subsequent centrifugation or elution to achieve efficient oil–water separation. Based on their stable chemical property, PP and were selected as the substrates for drawing the fibers. In addition, PVDF and PTFE were explored to modify the wettability of PP and PE. The performances of as-prepared fibers were tested for removing oil from wastewater in both batch and continuous modes. Among all the fibers, the PVDF-modified PP fibers exhibited the best performance. For PP-based fibers with 5 wt% PVDF, the saturated oil-removal efficiency reached 92.24 % in case of the simulated wastewater and 81.10 % for the actual wastewater. Given that the oil content in coal pyrolysis wastewater was ~2000 ppm, the residual oil content in the outlet water would be ~380 ppm, which satisfies the requirement of the subsequent treatment process. Furthermore, the PVDF-modified PP fibers exhibited excellent reusability and stability to defy various environmental corrosions. The separation of oil and water based on the adsorption by fibers offers promising prospect to remove oil from coal pyrolysis wastewater. In addition, we derived a formula to calculate the oil contact angle under water based on Young's equation using several measurable parameters. As the calculation results were consistent with real scenarios, this derived formula can provide quantitative guidance for material modification in coal wastewater treatment .
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MATERIALS RESEARCH BULLETIN
·
2025
·
IF 5.7
Xiaodong Yang,Jin Tong,Xuefei Yang,Xueqin Shao,Tianyang Luo,Shengjun Zhao,Enshuo Zhang,Bowen Jiang,Lili Wang,Ye Han,Fanming Zeng,Andrew R. Zimmerman,Bin Gao
Recently, sustainable biochar composites created from waste biomass and other benign materials have attracted increasing attention for their promising potential in the removal of organic contaminants from environmental media. A facile approach combining coprecipitation-hydrothermal synthesis with buried carbon pyrolysis was used to produce composites composed of Mg-Al hydrotalcite and hickory-chip/peanut-shell biochar which was tested for its ability to remove anionic Congo red (CR) from aqueous solution. The composites exhibited high specific surface area, high micro-porosity, and abundant oxygen/carbon-containing functional groups. The sorbents derived from hickory and peanut shell exhibited maximum experimental CR adsorption capacities of 1045.6 and 1195.0 mg g -1 , respectively (20 times of pristine biochar) with removal rates of 86.1% and 98.3%, respectively, superior to those of hydrotalcite and many other advanced CR sorbents. The work highlights the potential of hydrotalcite/biochar composites as a promising adsorbent for water treatment and environmental applications.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
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2012
·
IF 2.487
Hong-Bing Chen,Xue Dong,David A. Schiraldi,Li Chen,De-Yi Wang,Yu-Zhong Wang
A novel phosphorus-containing poly(trimethylene terephthalate) (PTT) derived from 2-(6-oxido-6H-dibenz〈c,e〉〈1,2〉oxaphosphorin-6-yl)-1,4-hydroxyethoxy phenylene was synthesized via solid state polymerization, and its chemical structure was confirmed with 1 H NMR. The thermal stability of the resulting copolyester was analyzed by thermogravimetric analysis. With the introduction of phosphorus-containing segments, polyester onset weight-loss temperatures in both nitrogen and air are enhanced. Thermal degradation kinetics were analyzed using the Flynn–Wall–Ozawa method, which showed a decreased activation energy for the copolyester compared with that for neat PTT, strongly suggesting that the increased onset weight-loss temperature in nitrogen is a result of enhanced carbonization. Microscale combustion calorimetry was carried out to test the flammability behavior of the copolyester; improved flame-retardant properties were observed with incorporated phosphorus components. Py-GC–MS testing revealed that the pyrolysis of phosphorus-containing copolyester is not significantly affected by the phosphorus incorporation.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Ming Huang,Wei Cai,Liang Zhu,Jie Li,Zhongqing Ma
Kraft lignin (KL), isolated from black liquor, serves as a significant feedstock for the production of bio-aromatics by catalytic fast pyrolysis (CFP). First, the influence of pH on the chemical structure of KL isolated by the gradient acid precipitation (GAP) was investigated. Then, the dual-catalyst CFP (DC-CFP) was employed to convert KL into light aromatics by using the hierarchical Nb 2 O 5 (Hie-Nb 2 O 5 ) and the microporous HZSM-5 as catalyst. Results showed that the decrease of pH during GAP promoted the breakage of the ether bond of KL, resulting in lower molecular weight and less content of hydroxyl group in KL. Among the four types of metal oxides (Hie-Nb 2 O 5 , Al 2 O 3 , MgO, and CaO), the synergistic effect of dual-catalyst grouped by Hie-Nb 2 O 5 and HZSM-5 was best for the production of light aromatics. In addition, the maximum production of light aromatics was reached at the pH of 2 and the mass ratio of Hie-Nb 2 O 5 -to-HZSM-5 at 2:2.
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