Materials
·
2019
·Vol. 12
·期 20
·3432
·
IF 2.972
Shumin Fan,Shuai Pei,Tianyu Shen,Guangri Xu,Yuanchao Li,Wenxiu Fan
In this paper, a novel superhydrophobic magnetic sawdust (SMSD) was fabricated as an oil sorbent. The SMSD was functionalized with Fe3O4nanoparticles using melamine formaldehyde resin (MFR) as a coupling agent and subsequently hydrophobically-treated with hexadecyltrimethoxysilane (HDTMS). The SMSD showed excellent superhydrophobicity with the water contact angle of 155.3 ± 0.9°. Meanwhile it had remarkable environmental durability, long-term stability, and mechanical durable properties. Taking advantage of its magnetic characteristics, the SMSD could be easily controlled to absorb oil to separate oil–water mixtures with high oil absorption capacity and good reusability. Moreover, the emulsion was successfully separated by SMSD, including water-in-oil and oil-in-water emulsions. This study developed an effective oil absorbent, which was low cost and environmentally-friendly.Keywords:sawdust;superhydrophobic;magnetic;oil absorption;emulsion separation
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Yi Wei,Xiying Jia,Yifei Chen,Jianbing Ji
Molten carbonate pyrolysis with steam on fir sawdust was conducted to produce activated carbon, in which physical and recycling chemical activation was combined with carbonization as a single step process. The effects of temperature, molten carbonate pyrolysis and steam flow rate on the activated carbon were investigated. The BET results showed an excellent specific surface area of 822.02 m 2 /g and a pore diameter of 2.39 nm. The adsorption capacities of the activated carbon achieved ideal values on methylene blue and iodine and reached a removal capacity of 196.5 mg/g for the elimination of Cr(VI) in wastewater. There were four stages in developing the porous structure of activated carbon by the joint effects of molten carbonates and steam as the temperature rising. The activated carbon had abundant micropores inside the macropore structure at temperatures ranging from 700 °C to 750 °C. Molten carbonates promoted the formation of mesopores and macropores and reduced the reaction temperature as a catalyst and heat transfer medium, while steam promoted micropore generation by water-gas shift reactions. A recycling study indicated that the Cr(VI) adsorption capacity of the activated carbon generated after five recycling cycles of molten carbonates was still reached 195 mg/g.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2019
·
IF 4.191
Xiaoyun Li,Jiaxin Yang,Rui Xu,Lefu Lu,Fangong Kong,Min Liang,Lijie Jiang,Shuangxi Nie,Chuanling Si
The production of platform chemicals from lignocellulosic biomass is scientifically valuable but technologically challenging. With the aim to establish a green reaction system for the production of furfural from lignocellulosic biomass, in the current work, H-SAPO-34 was investigated for catalysis of the conversion of Eucalyptus sawdust to furfural in γ-valerolactone (GVL). H-SAPO-34 was prepared and characterized by XRD, SEM, FTIR, BET, TGA and ammonia adsorbed FTIR. H-SAPO-34 possesses Brønsted and Lewis acid sites and a large specific surface area. The average pore diameter of H-SAPO-34 was 0.86 nm, which is beneficial for the spread of xylose and furfural and the inhibition of humin production. In this work, a peak furfural yield of 99.28% from Eucalyptus was achieved at 210 °C in 120 min with 30 g/L H-SAPO-34. The Brønsted/Lewis acid bifunctionality and the solvent effect of γ-valerolactone possibly contributed to the high furfural yield from real biomass. The kinetics of the conversion of Eucalyptus sawdust to furfural was also studied, and the activation energy for furfural production was calculated. Additionally, the catalytic activity and stability of the regenerated catalyst were estimated.
研究领域:
化学工程
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可再生资源与环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2017
·
IF 5.715
Lingjun Kong,Minhua Su,Yan Peng,Li'an Hou,Juan Liu,Haipeng Li,Zenghui Diao,Kaimin Shih,Ya Xiong,Diyun Chen
Because of the widespread application of activated carbon (AC) as adsorbents, reduced production costs are highly desirable, therefore, inexpensive alternatives for activated carbon precursors and eco-procedures are presently sought. In this work, AC was successfully prepared from sawdust through co-calcinations with limestone. The surface area and porosity of the resulting ACs were evaluated according to the N 2 adsorption at 77 K. Acid Orange II (AOII) was utilized as a negative dye to study the potential of the resulting AC as an adsorbent. Results revealed that the surface area and total pore volume were both increased greatly. When the activated carbon was prepared in mass ratios of 1:2 and 1:1 (calcium carbonate to sawdust), the surface area increased to 611.4 and 706.9 m 2 /g, respectively, and the adsorption capacities increased to 310.89 and 389 mg/g. These enhancements indicated efficient activation, resulting in energy-saving and environmentally friendly activated carbon production. Thus, this paper provides a cleaner process for producing activated carbon from waste sawdust through bioresource recycling.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2020
·Vol. 10
·期 1
·1-18
·
IF 3.998
Wang Yanting,Gong Shengying,Li Yazhuo,Li Zhang,Fu Jie
In this study, a novel, sustainable and efficient ceramsite substrate of constructed wetlands (CWs) were prepared for tetracycline (TC) removal by employing bentonite (Ben) and red mud (Rm) as the main materials and pine sawdust (Ps) as the additive. The optimal parameters for Ben/Rm/Ps ceramsite preparation were obtained via orthogonal and one-factor experimental designs, and the optimal parameters were presented as follows: mass ratio of Ben: Rm: Ps = 4:1:0.9, preheating temperature = 240 °C, preheating time = 20 min, calcining temperature = 1150 °C, and calcining time = 14 min. The properties of Ben/Rm/Ps-op ceramsite (obtained at the optimal condition) were first analyzed, including XRD and SEM, and demonstrated a microporous structure with some crystal strength components. Neutral condition and higher temperature were indicated conducive to improve the TC removal efficiency, while coexisting ions (Na + or Ca 2+ ) showed adverse effect for TC adsorption by Ben/Rm/Ps-op. In addition, adsorption kinetics and isotherm could be well described by the second-order kinetics and linear isothermal model, respectively, which suggested chemisorption and multilayer adsorption thickness increased infinitely. The theoretical maximum TC adsorption capacity of Ben/Rm/Ps-op at 20 °C reached up to 2.5602 mg/g. In addition, Ben/Rm/Ps-op could effectively remove TC as the CWs substrate under a dynamic flow condition. Further, Ben/Rm/Ps-op exhibited high reusability capability and stability for TC removal, and the adsorption amount still remained for 2.13 mg/g ( C 0 = 80 mg/L) after three consecutive cycles.
研究领域:
环境科学
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水处理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xuan Liao,Ruiyu Guo,Meng Mei,Jinping Li,Teng Wang,Jingxin Liu,Si Chen,Wenxia Wang
Natural lignocellulose-based materials have numerous strengths such as abundance, cheap price and biodegradability, which indicates a brilliant prospect for environmental protection. This work aimed to design an efficient sorbent (NaSS-PSD) by pine sawdust (PSD) for the surveillance and management of enrofloxacin (ENR). In the study, sodium styrenesulfonate (NaSS) was chosen as an effective monomer to ameliorate the performance of PSD by graft copolymerization. The removal of ENR by NaSS-PSD was enhanced in comparison with the ungrafted ones under investigated conditions. Pseudo-second-order and Temkin were the best-fitted models to describe the adsorption behavior. For the first time, NaSS-PSD was employed as a novel extractant of solid-phase extraction (SPE) and dispersive solid-phase microextraction (DSPME) to develop accurate, eco-friendly and economic analytical techniques for trace ENR determination. Good linearity and reproducibility were obtained. The limits of detection were 0.41 μg/L for DSPME-HPLC-DAD technique and 0.15 μg/L for SPE-HPLC-DAD technique. These two methods exhibited satisfying practicability when applied to quantify ENR residue in real waters. The study on interfacial interaction mechanism and preferential binding sites suggested that hydrogen bond and π-π interactions took the primary responsibility. Our work provides a good perspective for tailoring natural lignocellulosic biomass to be alternative adsorbents for emerging pollutants.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 13
·7664-7676
·
IF 2.599
Zhu Guoting,Xing Xianjun,Wang Jiaquan,Zhang Xianwen
Different types of acid pretreatment are known to influence the removal of certain components from pine wood sawdust, due to differences in the acid hydrolysis, which also predetermine the final formation and adsorptive properties of the produced activated carbon (AC) through subsequent potassium hydroxide activation. AC made by using phosphorous acid as an acid pretreatment had the largest absorption capacity of methylene blue (MB) dye due to its highest acidity. Subsequently, the effects on the adsorption variables for this AC such as initial pH, MB concentration, contact time and temperature were investigated. The resulting adsorption process was classified as pseudo-second-order kinetic model, and the Langmuir isotherm model better described the equilibrium data in comparison with the Freundlich isotherm model. The outcome showed that a lower temperature had an increased adsorption capacity of sawdust-derived AC pretreated with phosphorous acid, which allowed maximum adsorption capacities of 303.03 mg/g at 30 °C, implying that the adsorption was an endothermic process. Phosphorous acid pretreatment and activation processes proved to be an effective strategy to prepare highly porous AC from sawdust, with high potential to cationic dye removal from liquid phases.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Yunhua Bai,Xiong-Fei Zhang,Jiali Ma,Mengjiao Yu,Lian Shu,Xiaoli Gu,Jianfeng Yao
Deep eutectic solvents (DESs) demonstrate significant promise in biorefining because of their ability to break down the complex and resistant structure of lignocellulose. In this study, a ternary DES system composed of AlCl 3 ·6H 2 O, formic acid (FA), and water was designed and applied for the pretreatment of poplar sawdust. The presence of AlCl 3 ·6H 2 O and FA provides Lewis and Brønsted acid sites, respectively. The addition of water adjusts the acidity of the DES system, thereby increasing the separation efficiency of the three lignocellulose components. Under optimal conditions, DES (30 wt% water content) pretreatment achieved a high cellulose recovery rate of 91.3 %, with xylose yields and lignin recovery rates of 79.5 % and 90.1 %, respectively. Additionally, the cellulose residue achieved an enzymatic digestion efficiency of 97.9 %. The mass balance results revealed that the pretreatment strategy could utilize 77.6 % of the raw poplar sawdust, confirming that the method is economical and feasible. This DES pretreatment technique presents significant promise for biomass valorization.
研究领域:
生物化学
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可再生资源与环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2022
·
IF 3.898
Wei Yang,Yalun Ma,Xu Zhang,Fan Yang,Dong Zhang,Shengji Wu,Huanghu Peng,Zezhou Chen,Lei Che
The effects of sulfuric acid-associated mechanical pretreatment on the hydrolysis behavior of pine sawdust were investigated in this study. Sulfuric acid could act as an acidic catalyst to depolymerize holocellulose through cleavage of the glycosidic bonds, the dissociation energies of which were supplied by the impact of a ball on pine sawdust, during milling. The destruction of glycosidic and hydrogen bonds in pine sawdust resulted in a decrease of crystallinity and an increase of water solubility. The sulfuric acid could promote the hydrolysis of holocellulose and its hydrolysis products. It also destroyed the chemical linkages between holocellulose and lignin during ball milling. The cleavage of chemical linkages with holocellulose made lignin more difficult to hydrolyze in subcritical water, and higher activation energy was needed to hydrolyze pretreated pine sawdust at higher reaction temperatures. It also led to the formation of glucose char and aromatic-linked polymer char from the hydrolysis products of holocellulose.
研究领域:
生物化学
·
可再生资源工程
✓ 已验证
DOI
高影响因子
Green Energy & Environment
·
2021
·
IF 8.207
Shiming Zhang,Qianhao Pan,Yapei Wang
Renewable solid sorbents for CO 2 capture and storage have shown great potentials for the sake of gaseous separation, tail gas treatment, environmental regulation and climate governance. However, current existed preparation and reusability of solid sorbents are generally subject to high energy consumption and complicated procedure. Herein, a light-controlled CO 2 separation system with high working temperature resulting from natural sawdust combined with polyethyleneimine is fabricated, which involves low energy input and few operating sequences. This system shows a direct and ratiometric response to sunlight illumination by which CO 2 can be reversibly adsorbed and released. This light-controlled CO 2 separation process is prospective to become an attractive alternative to traditional alkaline CO 2 collection method in terms of its convenience and low cost. As a practical demonstration, CO 2 mixed with N 2 is successfully separated through this light-controlled carbon capture and storage (CCS) system, which offers great promise for CO 2 capture and enrichment with applicability across a wide range of scales.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2024
·
IF 5.8
Xinyang Chen,Sijie Li,Yixi Lin,Shanshan Gao,Jin Liu,Yuan Xue,Xi Gao
A series of novel catalysts were prepared by modifying biochar (BC) with different metal loading (Fe, Zn) and thermal activation in different atmospheres (CO 2 , H 2 O). The catalysts were further used to upgrade the pyrolysis vapor from pine wood sawdust, aiming to produce high-quality bio-oil. The modified biochar catalyst exhibited strong deoxygenation ability to acids and ketones in bio-oil and effectively converted lignin-derived compounds into aromatic hydrocarbons and phenols . Subsequently, the catalyst (BC-Fe-CO 2 ) demonstrating the highest yields of phenols and aromatics was selected for condition optimization. Different catalytic temperatures and biomass-to-catalyst ratios were compared to determine the optimal conditions for producing high-quality bio-oil. Phenolics and aromatic hydrocarbons content in the bio-oil reached 70 % at the optimal condition and the selectivity of monocyclic aromatic hydrocarbons in aromatic hydrocarbons reached 77 %. The properties of the biochar catalysts were characterized using BET, SEM, XRD, and XPS. The superior performance of the modified BC catalysts not only relied on its enhanced surface area and porous structure but also due to active Fe sites. The detail reaction pathways of the bio-oil catalytic upgrading were also proposed. These findings underscore the potential of modified biochar in pyrolysis and catalytic upgrading for bio-oil with improved quality.
研究领域:
能源与燃料
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
Energy Technology
·
2023
·Vol. 11
·期 11
·2300554
·
IF 3.8
Fei Wang,Yuliang Zhang,Longjie Xie,Jie Wang,Ying Qin,Ting Shu,Mengyang Cong,Yanhua Lei,Lihua Dong
Solar-powered desalination technology offers a promising solution to the global scarcity of freshwater resources. Recently, researchers have become interested in solar-powered steam generators utilizing biomass materials. Herein, wood waste (sawdust) is recycled and subjected to high-temperature treatment to obtain carbonized sawdust (CSd), which is sprayed onto the surface of a sponge to assemble a sponge-based light absorber. The impact of sawdust carbonization temperature on water evaporation performance is examined, and it is found that a sponge-based light absorber with a sawdust carbonization temperature of 600 °C exhibits a photothermal conversion efficiency of 87.7% while maintaining low-energy consumption. Incorporating metal Ag into the light absorber improves water evaporation performance (photothermal conversion efficiency of 92.3%) and provides antibacterial properties. This photothermal evaporator maintains 89% photothermal conversion efficiency after 24 h of operation under 1 sun irradiation in 3.5 wt% NaCl solution. The antibacterial, efficient solar steam generator is expected for practical seawater desalination.
研究领域:
能源技术
·
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）