Minerals
·
2024
·Vol. 14
·期 6
·560
·
IF 2.2
Lijinhong Huang,Xiangrong Zeng,Chunyan Fan,Lihong Liu,Shafiq Alam,Bin Zeng,Shaomin Liu,Wanfu Huang,Ronghua Shu
It is important to recover La3+from metallurgical solutions or wastewater. However, the recovery rate of La3+is usually less than 1% and the recovery methods are not environmentally friendly or user-friendly. Therefore, a straightforward, efficient, clean, and economically friendly method is needed. In this investigation, a modified adsorbent, COSAC-Na2EDTA-15, which was made from theCamellia oleiferashell (COS) and disodium ethylenediaminetetraacetic acid (Na2EDTA), was invented. In addition, characterization of the COSAC-Na2EDTA-15 adsorbent was conducted using SEM and XPS, and the principle of adsorption was revealed. The adsorption kinetics followed P-S-O KM, while the isotherm of COS-activated carbon (COSAC) aligned more closely with the Langmuir model. Compared to COSAC, the maximum La3+adsorption capacity of COSAC-Na2EDTA-15 increased from 50 to 162.43 mg/g, and the content of O and N changed from 7.31% and 1.48% to 12.64% and 4.15%, respectively. The surface of the COSAC-Na2EDTA-15 exhibited abundant C, N, and O elements, and La3+was detected on the sample surface after adsorption. The test and analysis results fully indicate that La3+can be successfully adsorbed on the surface of COSAC-Na2EDTA-15. Because of its easy preparation, low cost, and superior performance, activated carbon made from COS finds extensive applications in the adsorption and recovery of rare earth elements.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Polymers
·
2021
·Vol. 13
·期 15
·2453
·
IF 4.329
Ri-si Wang,Ya Li,Xi-xiang Shuai,Rui-hong Liang,Jun Chen,Cheng-mei Liu
The development of effective heavy metal adsorbents has always been the goal of environmentalists. Pectin/activated carbon microspheres (P/ACs) were prepared through simple gelation without chemical crosslinking and utilized for adsorption of Pb2+. Scanning electron microscopy (SEM) revealed that the addition of activated carbon increased the porosity of the microsphere. Texture profile analysis showed good mechanical strength of P/ACs compared with original pectin microspheres. Kinetic studies found that the adsorption process followed a pseudo-second-order model, and the adsorption rate was controlled by film diffusion. Adsorption isotherms were described well by a Langmuir isotherm model, and the maximum adsorption capacity was estimated to be 279.33 mg/g. The P/ACs with the highest activated carbon (P/AC2:3) maintained a removal rate over 95.5% after 10 adsorption/desorption cycles. SEM-energy-dispersive X-ray spectrum and XPS analysis suggested a potential mechanism of adsorption are ion exchange between Pb2+and Ca2+, electronic adsorption, formation of complexes, and physical adsorption of P/ACs. All the above results indicated the P/ACs may be a good candidate for the adsorption of Pb2+.Keywords:pectin;activated carbon;microsphere;Pb2+;adsorption
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
PubMed
高影响因子
Processes
·
2022
·Vol. 10
·期 6
·1183
·
IF 3.352
Haibing Jiang,Jiufen Liu,Huaifa Wang,Runquan Yang,Wenzhi Zhao,Duo Yang,Song Yin,Liang Shen
Foam is essential in the flotation process. However, the gas–liquid–solid three-phase froth produced in the flotation process has very strong stability and is difficult to burst spontaneously. The existence of these froths will reduce the transport capacity of the pulp and affect the working efficiency of subsequent processes, such as filtration of the flotation concentrate. In this study, a new defoaming device is designed by combining mechanical impact with depressurized defoaming and its defoaming mechanism is analyzed theoretically. In addition, the liquid level height and pulp overflow method are applied to characterize the defoaming efficiency of the new defoaming device. The effects of impeller structure, pressure drop, impeller rotation frequency, and aeration rate on defoaming efficiency were studied. The results show that when increasing the pressure drop, the defoaming increases, but it will also enhance the generation of bubbles. The efficiency of combined mechanical–vacuum defoaming technology is superior under low-pressure drop using an SC impeller. Under −1 kpa vacuum condition, it only takes 168 s to eliminate 20 cm flotation froth height with combined mechanical impact, while it takes 453 s under ambient pressure, indicating that under vacuum conditions, the mechanical-defoaming method can significantly improve the defoaming efficiency, and the two have a certain synergistic effect.Keywords:coal;flotation froth;defoaming;vacuum
研究领域:
矿业工程
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化学工程
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Tongtong Wang,Florian J. Stadler,Dalal Z. Husein,Di Zhang,Jinjun Cai,Yifan Wang,Minghao Li,Yin Qiang,Jiyong Zheng
To efficiently remove organic pollutants from wastewater combined with a disinfection effect, using activated biochar (ACB) as substrate, ACB-Ag 3 PO 4 and ACB-Ag 6 Si 2 O 7 composite photocatalysts were prepared via the in-situ co-precipitation method. The structure, morphology, physicochemical, and optical properties were characterized by advanced techniques, and the adsorption-photodegradation effects on tetracycline (TC), chloramphenicol (CAP), and rhodamine B (RhB) were investigated. The results revealed that ACB-Ag 3 PO 4 and ACB-Ag 6 Si 2 O 7 with heterojunction were successfully synthesized, and their optimum loading ratios were 1:1 and 1:2, respectively. The removal rates of ACB-Ag 3 PO 4 and ACB-Ag 6 Si 2 O 7 for TC were 98.48% and 91.87%, 95.88% and 85.23% for CAP, 99.13% and 83.54% for RhB, respectively, and also much higher than those of pure Ag 3 PO 4 and Ag 6 Si 2 O 7 . Moreover, the degradation efficiency and mineralization rate of ACB-Ag 3 PO 4 were higher than those of ACB-Ag 6 Si 2 O 7 for all pollutants. Further, both composites maintained about a 99% sterilization rate against both S. aureus and E. coli at 48 h. These were attributed to the introduction of ACB, which enriched the elemental composition of Ag-based semiconductors and increased the specific surface area and visible light absorption. Importantly, the composites narrow the bandgap energy and optimize energy band structure, and the special structure of ACB facilitated the photocatalytic activity . Moreover, possible photogenerated carrier transfer paths of the two composites are either type-II or Z-scheme, and the performance differences are related to the photogenerated carriers, absorbance, and microstructure. ACB-Ag 3 PO 4 is more recommended for environmental applications given its better photostability and reusability than ACB-Ag 6 Si 2 O 7 , and its removal of TC and RhB from actual wastewater exceeded 61.39% and 86.62%, respectively.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Food Bioscience
·
2025
·
IF 5.9
Chunyun Qu,Jianjun Li,Fuxin Liu,Yu Zeng,Yiyin Xu,Weidong Bai,Hao Dong,Gongliang Liu
To diversify the aromas and enhance the quality of fruit wines, Zygosaccharomyces mellis LGL-1 (LGL-1), as a non-conventional yeast, was applied for fruit winemaking along with biochar facilitating the fermentation. Results demonstrated that LGL-1 exhibited higher synthesis of ethanol and esters compared to the commercial winemaking yeast CV171 during wampee/grape/litchi winemaking. Intriguingly, the main esters produced by LGL-1 were quite different from those of CV171, resulting in diverse flavors. Four kinds of food-grade biochar were applied to facilitate the fermentation of LGL-1 under the mimic solution of fruit juice (MSM medium) respectively, and results showed that the coconut shell granule biochar (G2) was the best choice with both substrate consumption and product formation improved significantly, especially with esters enhanced by 357.87%, owing to the reduced oxidation-reduction potential, improved intracellular ratio of NADH/NAD + and enhanced activities of esterase. When applied for wampee/grape/litchi winemaking, G2 could also facilitate the fermentation of LGL-1 with total content of esters in each wine improved by 173.7%, 71.8% and 44%. The total concentration of higher alcohols in wampee/grape wine was enhanced by 35.6% and 21.1%, but unchanged significantly in litchi wine. The content of total organic acids in grape wine and litchi wine was changed insignificantly but decreased by 16.7% in wampee wine, which might not affect the flavor based on the taste threshold of organic acids. Data above indicated that LGL-1 is a potential candidate for fruit winemaking, and the fermentation fortified by G2 is a promising method for improved aromas of fruit wine.
研究领域:
食品科学
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发酵技术
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酿酒学
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DOI
高影响因子
Scientific Reports
·
2020
·Vol. 10
·期 1
·1-13
·
IF 3.998
Zhang Haipeng,Xu Fangfang,Xue Jinyuan,Chen Shiyong,Wang Juanjuan,Yang Yanju
In this study, a redox precipitation method was used to load manganese dioxide (MnO 2 ) nanoparticles on biochar (BC) (BC@MnO 2 ) pyrolyzed from the invasive water hyacinth, and the adsorption of Cd(II),Cu(II), Zn(II), and Pb(II) was investigated. Several techniques were used to characterize the adsorbents. The results revealed that the BC surface was covered by many intertwined thin amorphous MnO 2 nanosheets, which significantly increased its specific surface area and pore volume. The adsorption of heavy metal ions by BC was negligible, whereas the MnO 2 -containing adsorbents exhibited a high capacity for adsorbing heavy metal ions. However, the MnO 2 -normalized adsorption amount decreased with increasing MnO 2 load and was largely unchanged at MnO 2 loads of 26.6% to 30.2%. The capacity for adsorbing heavy metal ions of BC@MnO 2 was pH-dependent, but the adsorption affinity was unaffected by coexisting ions. Column tests revealed that BC@MnO 2 with a load of 26.6% had a high capacity for removing heavy metal ions from simulated and real electroplating wastewater. Therefore, BC@MnO 2 with a load of 26.6% shows promise as a regenerable adsorbent for removing heavy metal ions from water/wastewater. This study could lay an essential foundation to develop a win-win strategy for heavy metal ions removal from wastewater using biochar derived from water hyacinth.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
PubMed
高影响因子
WASTE MANAGEMENT
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2025
·
IF 7.1
Hongtao Wang,Zhibao Huo,Qiang Jin
The steel industry is responsible for 30 % of global industrial greenhouse gas emissions, which is mainly dependent on metallurgical coke utilization. Although biochar represents a promising carbon–neutral alternative, its suboptimal mechanical properties have hindered its direct substitution for conventional coke. This work introduces an innovative hydrothermal carbonization-repolymerization strategy to synthesize high-performance biocoke from sustainable feedstocks of oak residues and waste soybean oil. Our approach is centered on a novel and bio-based polymerization agent, synthesized by blending epoxidized soybean oil from oxidized waste oil and tannic acid extracted from oak residues in a 3:1 mass ratio. The epoxidized soybean oil-tannic acid effectively undergoes cross-linking reactions with oak biochar and oak bio-oil that both in-situ generated from the hydrothermal carbonization, resulting in a highly cross-linked biocoke. The ESO undergoes epoxy ring-opening in the cross-polymerization reaction, providing more reaction sites for cross-linked reactions. Moreover, the resulting biocoke shows a significant aromatization and graphitization structure. Therefore, the biocoke displays superior mechanical and thermochemical properties, including crushing strength (86.0 % of M 40 ), abrasion resistance (6.6 % of M 10 ), coke strength after reaction (64.2 %), and higher heating value (40.79 MJ/kg), meeting the performance of first-grade metallurgical coke. A cradle-to-gate LCA indicates that substituting 50 % of metallurgical coke by biocoke results in a reduction of CO 2 emissions of 622.8 kg for per ton of iron production. This study not only provides a novel polymerization strategy for producing metallurgical-grade biocoke but also highlights its potential to significantly reduce the carbon footprint of the steel industry.
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DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Huayan Liu,Mengzhao Yang,Jiaxin Li,Yifei Chen,Qinglei Liu,Jiajun Gu
Highly polar C N functional groups on polyacrylonitrile (PAN) facilitate strong hydrogen bonding and dipole-dipole interactions with hydroxyl groups on the surfaces of active materials and current collectors. Here we report that the strong interaction between PAN and carbon black (CB) particles facilitates a uniform distribution of CB particles within the electrode and forms a well-connected conductive network on the surface of active material particles. This significantly enhances electron transport within the electrode, offering superior rate performance and cycling stability beyond traditional binders like polyvinylidene fluoride (PVDF). Activated carbon (AC) electrodes containing 7.70 wt.% PAN binder (AC-7.7PAN) deliver areal capacitances over 0.60 F cm⁻ 2 at a scan rate of 500 mV s⁻ 1 , and exhibits a high gravimetric energy density ( E g ) of 26.20 Wh kg⁻ 1 and high areal energy density ( E a ) of 0.33 mWh cm⁻ 2 at a current density of 1 A g⁻ 1 . An AC-7.7PAN coin-cell supercapacitor maintains up to 62 % of its initial capacitance at a scan rate of 200 mV s⁻ 1 , while a controlled AC-7.7PVDF coin-cell keeps only 37 % under the same conditions. The AC-7.7PAN coin-cell retains 91 % of its capacity even after 50,000 charge/discharge cycles at a constant current of 5 A g⁻ 1 . The ability of PAN to evenly distribute conductive agents might be attractive for other power-type electrochemical electrodes, for which effective electron transport are extremely required.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Qingqing Cao,Yan Li,Yan Kang,Zizhang Guo
Polycyclic aromatic hydrocarbons (PAHs), as hazardous pollutants, could be removed by constructed wetlands (CWs). While the traditional substrate of CWs has a weak adsorption capacity for PAHs, in this study, the carbonous fillers—activated carbon (AC) and biochar—were added into the substrate of surface flow CWs to improve the removal performance of benzofluoranthrene (BbFA), a typical PAH. The results showed that the BbFA removal efficiencies in CWs with the addition of AC and biochar were 11.8 and 1.2% higher than those in the Control group, respectively. Simultaneously, the removal efficiencies of NO3––N were 42.8 and 68.4% in these two CWs, while the BbFA content in the substrate and plants with the addition of carbon was lower than that in the Control group. The addition of carbonous filler reduced the absorption of PAHs by plants in CWs and enhanced microbial degradation. The microbial community results showed that the relative abundance of Proteobacteria, especially γ-proteobacteria, was higher with the addition of fillers, which related to PAH degradation.
研究领域:
环境科学
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水处理
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污染控制
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微生物学
✓ 已验证
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2023
·
IF 9.8
Jiaqing Huang,Jing Ye,Wenhui Gao,Cenwei Liu,G.W. Price,Yanchun Li,Yixiang Wang
Pyrolytic biochar (PL-BC, pyrochar) and hydrothermal biochar (HT-BC, hydrochar) derived from branches and leaves of tea plants had different pH, electrical conductivity (EC), total carbon nitrogen content, BET surface area, total pore volume, average pore diameter, and functional groups. HT-BC had a larger specific surface area and more functional groups than PL-BC. Ralstonia Bcul-1 ( R -B) was the dominant and functional bacteria in a fertilized vegetable soil supplemented with TBB - immobilized R -B (TBB + R -B). R -B vitality was more closely related to BET surface area, total pore volume, and functional groups of tea-based biochar (TBB: PL-BC and HT-BC). R -B was able to maintain high oxidase activity. R -B and TBB + R -B can increase the activities of urease and peroxidase in vegetable soil playing an essential role in the biotransformation of ammonium nitrogen (NH 4 + -N) and nitrate nitrogen (NO 3 − -N). TBB was able to simultaneously increase the content of NO 3 − -N and NH 4 + -N, and TBB + R -B also significantly increased NO 3 − -N content but decreased NH 4 + -N content in a fertilized vegetable soil. These results indicated that R -B promoted nitrification in the soil, i.e. conversion of NH 4 + -N into NO 3 − -N, by enhancing the activities of urease and peroxidase. R -B had high adsorption capacity for cadmium (Cd) and chromium (Cr) (Cd&Cr: Cd and Cr). Moreover, TBB + R -B was able to convert weak acid extractable and reducible Cd&Cr into a more stable residual fraction and oxidizable Cd&Cr. The overall effect of the treatments was to reduce plant uptake of Cd&Cr by cabbage. TBB + R -B significantly promoted R -B growth, changed inorganic nitrogen speciation, increased NO 3 − -N supply, reduced Cd&Cr bioavailability, and decreased plant tissue Cd&Cr content.
研究领域:
环境科学
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土壤学
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微生物学
·
农业
✓ 已验证
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2024
·
IF 9.7
Md Shafiqul Islam,Hui Deng,Youming Dong,Junhua Zhu,Minling Gao,Zhengguo Song
Arsenic and cadmium (As/Cd) are toxic elements which negatively impact the health and productivity of rice plants by subjecting them to stress. To address these issues, we developed three biochar amendment materials derived from plant-based corn-stover with iron-magnesium modification (FM@CB), char sourced from animal-based eggshells with iron-magnesium modification (FM@EB), and a blend (1:1, w/w) of both (FM@CEB). Batch adsorption experiment revealed that FM@CB exhibited a Langmuir sorption capacity of 77 mg g −1 for As(III) and 107 mg g −1 for Cd(II). In contrast, FM@EB showed values of 63 mg g −1 for As(III) and 115 mg g −1 for Cd(II), both observed in mixed systems. The exothermic dual adsorption mechanisms could include ion exchange, cation-anion bridging, complexation with surface functional groups, and precipitation processes. Pot trials were conducted, and the findings unveiled a substantial enhancement in rice grain yield with a 2% application of FM@CB, FM@EB, and FM@CEB. Specifically, there was a notable increase of 21.9%, 34.9%, and 37.6%, respectively. Simultaneously, the application led to a reduction in grain As levels by 34.4%, 53.2%, and 42.6%, and grain Cd levels by 48.7%, 71.2%, and 59.9%, respectively, in comparison to the no-amendment control condition. Our study observed a transformation in the soil's microbial community, as beneficial bacterial genera such as Anaeromyxobacter , Citrifermentans , and Desulfovibrio emerged to assist in the detoxification of these metal contaminants. Concurrently, the application of these materials led to a reduction in harmful bacterial genera like Pseudomonas , Flavobacterium , and Massilia . In addition, these amendments decreased the bioavailable As/Cd fractions in the soil and promoted the root-iron-plaque, which effectively sequesters these contaminants, rendering rice quality improvement. Ultimately, the use of these amendments, particularly FM@CEB, holds the promise of protecting rice from harmful metal(loid)s contaminants, increasing yields, and revitalizing the soil. The presence of these unique bacterial genera, especially those capable of detoxifying As/Cd, plays a crucial role in ensuring a healthier and more secure environment for all living organisms.
研究领域:
环境科学
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农业科学
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产品关联
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Yuxiang Chen,Chao Li,Lijun Zhang,Shu Zhang,Jun Xiang,Song Hu,Yi Wang,Mortaza Gholizadeh,Xun Hu
Pig manure is a typical solid waste, which features a high content of inorganics. These inorganics might be involved in thermochemical conversion of pig manure, and this was investigated herein by pyrolysis of pig manure leached with varied concentrations of H2SO4 (0.5–6 mol L–1) at 600 °C. The removal of acid-leachable inorganics [CaCO3, Ca3(PO4)2, alkaline oxides, etc.] exposed more acidic sites derived from the oxides, like SiO2. This enhanced production of the gases at the expense of bio-oil. Furthermore, aromatization and secondary condensation reactions were also promoted, increasing not only the yield of char (from 29.6 to 39.7%, on an organic basis) but also the carbon content in char from 16.1% (blank sample) to 26.2% (leached with 6 mol L–1 H2SO4). Leaching partial inorganics rendered more sufficient contact and interaction between the organics, facilitating charring of organic matter. This further retained more carbon skeleton for generation of more micropores, which further enhanced the capability of the resulting char for adsorption of phenol. In situ infrared analysis indicated the presence of more abundant oxygen-containing functionalities and carbonaceous species after the leaching treatment, favoring the occurrence of aromatization reactions.
研究领域:
环境科学
·
能源转化
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）