SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Junyu Tao,Yincheng Wang,Yingying Yu,Yongjie Hu,Chen Chen,Ning Li,Beibei Yan,Zhanjun Cheng,Guanyi Chen
Fulvic acid (FA), a widely existed contaminant in organic wastewater, also represents a significant chemical asset. Recovery using activated carbon (AC) faces limitations due to FA’s high solubility, and the concomitant recovery of other contaminants undermines the value of the recovered FA. In this study, by carefully designed experiments, we have demonstrated that introducing a gaseous CO 2 flow can selectively enhance the FA recovery capacity of AC at room temperature. Extensive experiments and characterizations were conducted to validate the enhancing capability, explain its working mechanism, and optimize the recovery performance for FA. Results showed that the optimal conditions for FA recovery were found to be an FA concentration of 2 g/L, an AC dosage of 1 g, and a CO 2 flow rate of 0.1 L/min. Compared with the sole AC recovery system, the AC + CO 2 system significantly increased FA recovery capacity from 28.7 mg FA /g AC to 98.9 mg FA /g AC with negligible enrichment of other pollutants. The adsorption process in the AC + CO 2 system followed a pseudo-second-order kinetic model, indicating a predominance of chemical adsorption mechanism. Further experiments were designed to figure out the recovery-enhancing mechanism in respects to gas flow disturbance, pH, and ion species. It was found that the existence of HCO 3 – played an important role in recovery enhancement of AC. Furthermore, the enhancing effect could work for different kinds of AC but only work for FA recovery. The discoveries are promising to develop an effective and economic FA recovery technique in aqueous systems.
研究领域:
环境科学
·
化学工程
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产品关联
DOI
高影响因子
Heliyon
·
2024
·
IF 3.4
Yihang Yue,Xiaoju Yue,Xiaofeng Tang,Lin Han,Jinnong Wang,Shifeng Wang,Chun Du
The discharge of organic pollutants by the textile and dyeing industries presents an escalating threat to aquatic environments, necessitating the development of effective remediation strategies. This study introduces the utilization of graphite-like structured activated carbon (AC), derived from highland barley straw—a biomass unique to the Plateau regions of China, including Tibet, Qinghai, and Gansu—as a support material for the TiO 2 catalyst. TiO 2 /AC composites with different TiO 2 loadings were synthesized by ultrasonic impregnation. The TiO 2 /AC composites were found to be polycrystalline materials composed of anatase and rutile phases. The TiO 2 nanoparticles are well-dispersed over the surface of the AC. The photocatalytic activity of these composites was evaluated through their capacity to degrade a methylene blue (MB) solution upon irradiation. It was observed that the inclusion of TiO 2 increases the number of adsorption sites and active sites for methylene blue, with the photocatalytic activity being notably higher at a 3-wt% TiO 2 loading, achieving a remarkable 99.6 % degradation efficiency for 100 mg/L MB within 100 min. The experimental kinetic data for the photocatalytic process follow the pseudo-first-order kinetic model. Furthermore, TiO 2 /AC retains high photocatalytic activity after five reaction cycles. This research provides valuable insights into the application of biomass-derived materials for the purification of water, offering a sustainable solution to both pollution and agricultural waste challenges in Plateau areas of China.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
RENEWABLE ENERGY
·
2025
·
IF 9.1
Deliang Xu,Yuan Yin,Jinchuan Wang,Xiang Liu,Lei Shi,Sasha Yang,Juntao Wei,Xun Hu,Shu Zhang
The fate of nitrogen during the thermochemical carbonization of biomass is crucial for the preparation of bio-fuels and bio-materials. This study examines the nitrogen diffusion and transformation during the hydrothermal carbonization (HTC) of xylan, cellulose, and lignin in a nitrogen-rich aqueous solution recycled from the hydrothermal treatment of fiberboard. The results show that the HTC of xylan in nitrogen-rich aqueous solution promotes the nitrogen diffusion from the aqueous phase to hydrochars in a broad temperature condition, while the HTC of cellulose in similar conditions mainly influences the nitrogen evolution when the temperature exceeds 220 °C. However, the HTC of lignin has no significant effect on the nitrogen conversion. Heterocyclic-N was the predominant form of nitrogen-containing structure in the hydrochars, and it converted to a more stable structure with increasing temperature. During the HTC, the ammonium ion was the predominant nitrogen species in the aqueous phase, which was readily converted to organic-N during HTC of xylan, while it was temperature dependent in the case of the HTC of cellulose. The results provide an in-depth understanding of nitrogen transfer and transformation during the HTC of nitrogen-rich lignocellulose biomass.
研究领域:
能源与环境科学
·
生物化学
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Wenjie Li,Pengfei Mao,Xuwen Chen,Wanting Ling,Chao Qin,Yanzheng Gao
Developing efficient passivating sorption materials for the treatment of combined pollution by phthalate esters (PAEs) and Cd 2+ has become a critical focus in environmental protection and soil remediation. In this study, biochar-sulfhydryl modified montmorillonite composites (BC-SHMMT) were synthesized, characterized, and evaluated for the co-sorption of PAEs (DMP, DEP) and Cd 2+ . The integration of sulfhydryl-modified montmorillonite (MMT-SH) with biochar improved the material's surface structure, enhancing both co-sorption capacity and structural stability. Molecular dynamics simulation indicated a monolayer chemical sorption of pollutants by BC-SHMMT, in alignment with the sorption theoretical model. In the co-sorption system, the coexistence of pollutants increased the adsorption of Cd 2+ and decreased the sorption of PAEs. The smaller molecular size and higher diffusion coefficient of Cd 2+ facilitated its pore filling and interaction with oxygen-containing functional groups of the material, leading to competition with PAEs for sorption sites. Notably, the ion exchange and complexation of Cd 2+ adsorption by MMT-SH are pivotal in enhancing BC-SHMMT co-sorption capacity. These findings provide valuable insights into the development of eco-friendly novel materials and the improvement of co-pollution remediation efficiency.
研究领域:
环境科学
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土壤修复
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Zhenguo Qi,Xin Huang,Min Wang,Chunfeng Lv,Baoyou Shi
Activated carbon (AC) filtration is an effective technique to remove emerging contaminants in drinking water treatment plants. Adsorption onto AC and biodegradation by biofilm are two main mechanisms for the removal of emerging contaminants such as antibiotics. However, the effects of highly bioaccumulative and toxic poly- and perfluoroalkyl substances (PFAS) on antibiotic removal by AC filtration have not been well-understood. In this work, two AC columns were built and operated for 434 days to study the effects of ng-level PFAS on the removal of sulfamethoxazole (SMX). The results showed that 100 ng/L PFAS significantly decreased the removal rate of 1 μg/L SMX from 78.8% to 71.7%. Trace PFAS decreased the abundances of ammonia monooxygenase and nitrite-oxidizing bacteria, thus repressing nitrification co-metabolism process. Meanwhile, trace PFAS inhibited tricarboxylic acid (TCA) cycle by preventing pyruvate from generating acetyl-CoA, reducing energy supply for co-metabolism process. On the other hand, inhibiting TCA cycle led to a redirection of carbon from growth into polysaccharide intercellular adhesin biosynthesis. Trace PFAS also increased glutamate synthase and glutamine synthetase abundances, which promoted biofilm formation and then hindered SMX adsorption by AC. This study provides new insights into the adverse role of PFAS in antibiotic removal by AC filtration.
研究领域:
环境科学
·
微生物学
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产品关联
DOI
PubMed
高影响因子
Sustainability
·
2025
·Vol. 17
·期 11
·5049
·
IF 3.3
Qi Wang,Guanghui Zhuo,Dongxin Xue,Guangcan Zhu,Chu-Ya Wang
Elevated phosphorus levels in aquatic ecosystems have been identified as a critical driver of eutrophication processes, necessitating resource-recovery remediation strategies. Adsorption techniques show particular promise for nutrient recovery due to their selective binding capacities and operational feasibility. In this study, the Mg- and Ca-modified biogas residue-based biochar (Ca-Mg/BC) was successfully prepared via a “bimetallic loading-pyrolysis” modification strategy. The optimum temperature for the calcination of the material and the salt solution impregnation concentrations were determined experimentally through optimization of the synthesis conditions. Structural and chemical analyses of Ca–Mg/BC demonstrated that the material contains MgO and CaO. The specific surface area of Ca–Mg/BC was 8.49 times higher than that of the unmodified biochar (BC). The optimized Ca–Mg/BC achieved 95% phosphate removal rate (157.13 mg/g adsorption capacity). FTIR and XPS characterization results indicated the importance of Ca/Mg loading in phosphate capture. MgO and CaO were mainly loaded on the surface of the material and adsorbed phosphate through a chemical reaction. Crucially, the phosphate-laden biochar exhibited potential as a nutrient-enriched soil amendment, opening the material loop from wastewater treatment to agricultural applications. This sustainable strategy simultaneously addresses water pollution control and sustainable development, providing environmentally benign solutions compatible with industrial effluent treatment and sustainable agriculture practices.
研究领域:
环境科学
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材料科学
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农业资源利用
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DOI
高影响因子
CHEMOSPHERE
·
2025
·
IF 8.1
Xi Chen,Ming Li,Jingjing He,Yang Wu,Jiahao Sun,Xiaogang Wen
A novel adsorbent is prepared from waste cotton fiber by a simple pyrolysis-activation process, and it can efficiently adsorb many kinds of organic pollutants (cationic/anionic dyes and antibiotics etc.). The obtained cotton-based activated carbon (CAC) with large specific surface area (3709 m 2 g −1 ) and suitable pore structure provide abundant active sites and fast channels for the adsorption of pollutant molecules. Its saturated adsorption capacities towards methylene blue, Congo Red and tetracycline hydrochloride at room temperature can reach to 2331, 7265 and 1250 mg g −1 , respectively. In addition, the optimal sample also exhibits excellent adsorption ability towards Rhodamine B (1327 mg g −1 ), methyl orange (955 mg g −1 ) and ciprofloxacin hydrochloride (824 mg g −1 ). The adsorption involves a multi-process including pore filling, Van der Waals force interaction, electrostatic attraction, hydrogen bond formation, surface complexation and π-π stacking etc. The CAC adsorbent also exhibits excellent resistance to environmental disturbances (pH, coexisting ions and multicomponent systems etc.) and good regeneration/recycling performance. This study develops a high-efficiency biomass-based adsorbent with excellent adsorption performance and application generality, which has great potential in wastewater treatment.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Yaxing Bai,Xuefeng Hu,Huixian Du,Meng Gao,Zilong Li,Yuhuan Fei
To expand the utilization of discarded walnut shells and enhance the photocatalytic activity of graphitic carbon nitride(g-C 3 N 4 ), the carbon-rich graphitic carbon nitride anchored with Fe sites (FeW-CN) was synthesized via a walnut shell-based biochar-assisted strategy. Unlike the direct thermal copolymerization of melamine for g-C 3 N 4 , the iron-loaded walnut shell-based biochar (FeW) was first synthesized, followed by thermal copolymerization of melamine with FeW to form FeW-CN. The C substitution on the triazine ring enhanced the light absorption and electron migration for FeW-CN. And the Fe sites interacting with N-(C) 3 further improved the migration and the utilization rate of photogenerated carriers. During the degradation of 2-Mercaptobenzothiazole, FeW-CN showed excellent photocatalytic performance and stability compared with g-C 3 N 4 . Moreover, FeW-CN maintained excellent photocatalytic performance in river water. Combination of electron paramagnetic resonance with active species quenching experiments, the synergistic mechanism of singlet oxygen, holes, and superoxide radicals was confirmed in the FeW-CN system. Compared to g-C 3 N 4 , the Fe sites and C substitution enhanced the production of singlet oxygen.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Na Liu,Yinhui Li,Minggu Zhang,Naiju Che,Xianliang Song,Yanli Liu,Chengliang Li
As the substitutes of legacy long-chain per-/polyfluoroalkyl substances (PFASs), short-chain PFASs have been widely detected in the environment. Compared to long-chain PFASs, short-chain PFASs have smaller molecules and are more hydrophilic. Therefore, they are more likely to experience long-distance transport and pose lasting environmental impacts. In this study, Fe-doped (R-Fe) and Cu-doped biochars (R-Cu) were prepared using reed straw biochar (R). The results showed that the PFBA and PFPeA sorption capacities of R-Fe were 25.81 and 43.59 mg g −1 , 1.65 and 1.55 times higher than those of R, respectively. The PFBA and PFPeA sorption capacities of R-Cu were 19.34 and 33.69 mg g −1 , 1.24 and 1.20 times higher than those of R, respectively. In addition, R, R-Fe, and R-Cu exhibited higher PFBA and PFPeA sorption capacities than the biochars previously reported. The excellent PFAS sorption performances of the biochars were attributed to the highly porous structure of R, which provided rich adsorption sites. Ion-pair sorption, pore filling, electrostatic interaction between the Fe/Cu and cationic groups on biochar and the anionic groups of PFASs, and hydrophobic interaction between the hydrophobic surface of biochar and the fluorinated tails of PFASs were the underlying sorption mechanisms. The biochars presented high removal rates (>86 %) of multiple PFASs (∑PFAS: 350 μg L −1 ) from synthetic wastewaters, including legacy and emerging PFASs of different chain lengths and with different functional groups. The biochars reported in this study are promising candidate adsorbents for treating waters contaminated with short-chain PFASs.
CAS / MDL:
研究领域:
环境科学
·
污染控制
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2024
·Vol. 46
·期 12
·1-17
·
IF 3.2
Liu Anrong,Feng Li-Juan,Ou Yangyang,Zhang Xiaoya,Zhang Jinhong,Chen Hongyan
Biochar has been widely used to solve the wastewater pollution of polycyclic aromatic hydrocarbons (PAHs). However, the competition of PAHs with different benzene ring numbers (e.g., phenanthrene [Phe], pyrene [Pyr], and benzo[a]pyrene [BaP]) for adsorption sites on biochar has received little attention. In this study, biochar was produced by co-pyrolysis of sludge and phosphorus tailing at different temperatures (300, 500, or 800 °C) to adsorb PAHs. The results show that phosphorus tailing increased the adsorption of PAH by increasing the biochar’s BET surface area (S BET ), micropore volume, hydrophobicity (at low temperatures) and aromaticity (at high temperatures). The maximum adsorption capacities were 29.90 µmol/g for Phe, 25.58 µmol/g for Pyr and 20.45 µmol/g for BaP, respectively. Importantly, the types and functions of groups involved in the adsorption of various PAHs were discussed. Adsorption of Phe and Pyr on the biochar mainly involved C=O and C–O–C functional groups, and there was a certain degree of competition between these PAHs for those sites. In contrast, BaP mainly adsorbed at C–OH and C=C moieties, without competing with Phe or Pyr at C–OH sites. The competitive edge of BaP was also stronger than that of Phe and Pyr on C=C functional groups. The adsorption mechanisms involving pore filling, hydrophobic interactions, and π – π interactions governed the adsorption of the evaluated PAHs. Overall, the adsorption of PAHs on biochar followed a heterogeneous chemical adsorption process.
研究领域:
环境科学
·
化学
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产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Haiqian Zhao,Jiuyang Jia,Jiaxin Ying,Mingqi He,Zekun Sun,Xing Zhang,Zhonghua Wang,Wei Zhou
Utilizing flue gas as feedstock for CO 2 electro−reduction systems is a promising technology to address problems caused by excessive CO 2 emissions. However, the O 2 contained in the flue gas has a significant adverse effect on the CO 2 reduction. Herein, a facile strategy was proposed to suppress the influence of O 2 by constructing a CO 2 −enriched region. N−doping was demonstrated to be an efficient way to enhance CO 2 adsorption selectivity over O 2 on activated carbon. The N−doped activated carbon achieved 3.7 times increase in CO 2 adsorption selectivity over O 2 than that before modification under simulated flue gas atmosphere (75 %N 2 + 15 %CO 2 + 10 %O 2 ). The distinction in adsorption mechanism between CO 2 and O 2 was revealed by quantum chemistry study. The increased polarity of the carbon materials favored CO 2 adsorption and had less impact on O 2 adsorption. The electrostatic interaction between CO 2 and carbon material was demonstrated to be enhanced after the introduction of pyridinic N and pyrrolic N, which led to an improvement in the CO 2 adsorption capacity. The dispersion interaction, which fully regulated O 2 adsorption, was weakened due to the deviation of the O 2 adsorption position. This study provided a reference for the subsequent development of CO 2 selective adsorption materials.
研究领域:
环境科学
·
材料科学
·
化学工程
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产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Xiaoran Li,Kehui Cen,Liangcai Wang,Dongxia Jia,Xiefei Zhu,Dengyu Chen
Cellulose, hemicellulose, and lignin constitute the basic components of biomass. Knowledge of the interactions between cellulose and lignin during pyrolysis is crucial for unraveling the pyrolysis characteristics of biomass. In this study, for the co-pyrolysis of cellulose and lignin to produce biochar, three influencing factors were selected: pyrolysis temperature (400–800 °C), residence time (5–30 min), and lignin percentage (0–100 %). Pyrolysis experiments were conducted in a vertical tube furnace and the impact of these three factors on the characteristics of biochar was comprehensively explored employing response surface methodology. The results revealed obvious differences between actual values and theoretical values. Specifically, the results showed that the interaction between cellulose and lignin increased the biochar yield, oxygen content, volatile content, and ash content by 6.14 %, 22.85 %, 30.95 %, and 46.75 %, respectively. In contrast, the carbon content, fixed carbon content, and HHV of biochar were relatively reduced by 9.38 %, 11.80 %, and 3.3 %, respectively. Furthermore, Raman spectra of biochar showed that the actual value of graphitization degree of biochar was higher than the theoretical value. This was further corroborated by XPS analysis, wherein owing to the interactions between cellulose and lignin, the actual C-C bond content decreased in contrast to the theoretical value. However, the contents of C-O, C O, COOH functional groups, and aromatic rings increased. Finally, the summary of the co-pyrolysis rules of cellulose and lignin provided a reference for optimal pyrolysis conditions and understanding the mechanism of co-pyrolysis.
研究领域:
能源与环境科学
·
生物质工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）