BIORESOURCE TECHNOLOGY
·
2023
·
IF 11.4
Zepeng Liu,Yueyao Hu,Jie Zhang,Ying Guan,Liping Zhang,Ping Ye,Tongtong Zhang,Xingyu Huang,Meng Wang,Hui Gao
Adsorbents with excellent physicochemical properties and green synthetic routes are desired for efficient removal of Congo red (CR) wastewater. Hence, a novel approach was proposed within this work. Biochar NCBC obtained from Medulla Tetrapanacis was synthesized through co-modification with urea/calcium chloride. NCBC exhibited an enormous surface area (750.09 m 2 /g) and a micro-mesoporous composite structure. Higher nitrogen content was detected on the surface of NCBC (8.17%) compared to that of urea directly modified biochar (4.63%). Nitrogen observed on the surface of NCBC was presented as graphitic N, pyrrolic N, amine N as well as pyridinic N. Kinetic and isothermal investigations revealed the active sites on NCBC to be homogeneous and bind to CR mainly by chemisorption. Calculated maximum sorption of CR on NCBC was 2512.82 mg/g basing on Langmuir model. Moreover, the practicality of NCBC was further proved by the cultivation of Nelumbo nucifera Gaertn. and Penicillium .
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Peng-Fei Li,Jia-Xing Zhu,Zhi-Yong Zheng,Thangavel Sangeetha,Xue-Dong Zhang,Min-Hua Cui
Palladium (Pd) is recognized as a promising electrocatalyst for electrocatalytic hydrodehalogenation (ECH). However, the agglomeration-prone nature of Pd nanoparticles diminishes active site accessibility, significantly compromises their atomic utilization efficiency, thereby limiting ECH performance. To overcome this issue, a nickel (Ni)-catalyzed graphitized cyanobacterial biochar (GCB Ni ) has been developed through catalyst screening and process optimization. The incorporation of Ni enhanced the ordering of carbon arrangement in the biochar, endowing GCB Ni with a highly graphitized structure, superior electrical conductivity, and substantial surface area. Pd nanoparticles were supported on GCB Ni to fabricate the Pd@GCB Ni catalyst. The Pd@GCB Ni /CC electrode exhibited well-dispersed Pd nanoparticles, where GCB Ni modulated the Pd(0)/Pd(II) ratio and promoted the exposure of Pd(111) crystallographic planes. This structural modification increased accessible active sites, facilitated reactive atomic hydrogen (H*) generation, and improved both adsorption of florfenicol (FLO) and desorption of intermediate products. The Pd@GCB Ni /CC electrode demonstrated exceptional FLO removal efficiency (99.6 %±0.4 %) with an apparent rate constant ( k obs ) of 1.01 ± 0.08 h −1 . Remarkable stability was maintained through ten consecutive operational cycles, with superior ECH performance towards various halogenated organic pollutants containing different halogen substituents. This research provides novel insights into cyanobacterial resource utilization and establishes an effective support modulation strategy for developing high-performance ECH catalysts.
研究领域:
环境科学
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材料工程
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电化学
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催化
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2021
·
IF 11.236
Shi-Qi Tian,Jing-Yao Qi,Yun-Peng Wang,Yu-Lei Liu,Lu Wang,Jun Ma
After reaction with permanganate or ferrate, the resulted Mn-loaded and Fe-loaded biochar (MnOx/biochar and FeOx/biochar) exhibited excellent catalytic ozonation activity. O 3 (2.5 mg/L) eliminated 48% of atrazine (ATZ, 5 μM) within 30 min at pH 7.0, while under identical conditions, ozonation efficiency of ATZ increased to 83% and 100% in MnOx/biochar and FeOx/biochar (20 mg/L) heterogeneous catalytic systems, respectively. Radical scavenger experiment and electron paramagnetic resonance (EPR) analysis confirmed that hydroxyl radical (•OH) was the dominant oxidant. Total Lewis acid sites on MnOx/biochar and FeOx/biochar were 3.5 and 4.1 times of that on the raw biochar, which induced enhanced adsorption of O 3 and its subsequent decomposition into •OH. Electron transfer via redox pairs on MnOx/biochar and FeOx/biochar was observed by cyclic voltammetry scans, which also functioned in the improved catalytic capacity. Degradation pathways of ATZ in MnOx/biochar and FeOx/biochar ozonation systems were proposed, with 34.6% and 44.8% of dechlorination effect accomplished within 30 min of reaction, which was improved by 4.1 and 5.3 times compared to pure ozonation. After 12-hour treatment, acute toxicity of ATZ oxidation products was reduced from 38.3% of pure ozonation system to 14.5% and 6.3% of activated ozonation systems with MnOx/biochar and FeOx/biochar, respectively. Mn-loaded biochar and Fe-loaded biochar have great potential for heterogeneous catalytic ozonation of polluted water.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Yan Li,Liangmin Gao,Yu Wang,Shuo Cheng,Guowei Wu,Xuan Yang,Shunli Wan
Biochar-supported metallic oxides are attractive adsorbents for heavy metal cleanup, but the adsorption performance is still unsatisfactory as a result of the self-aggregation of the incorporated metallic oxides. A new hybrid nano-material was prepared through impregnating hydrated ferric oxide (HFO) nanoparticles within biochar bearing high-density charged oxygen-containing groups (e.g., carboxyl and hydroxyl groups) (ABC) derived from HNO 3 treatment. The as-made adsorbent, denoted as HFO-ABC, possesses highly dispersed HFO nanoparticles with typical size lower than 20 nm, and exhibits greater sorption capacity for Cd(II) and Cu(II) than the pristine biochar-supported HFO. It also shows great sorption preference toward Cd(II) and Cu(II) in co-presence of high levels of Ca 2+ , Mg 2+ and humic acid (HA). Such prominent performance is put down to the high-density charged functional groups on the host ABC, which not only promote the dispersion of the immobilized HFO nanoparticles but also generate the potential Donnan membrane effect, i.e., the pre-concentration and permeation of target metals prior to their preferable adsorption by nano-HFO. The predicted effective coefficients of intra-particle diffusion for Cu(II) and Cd(II) are 3.83 × 10 −9 and 4.33 × 10 −9 cm 2 /s, respectively. HFO-ABC exhibits excellent performance for fixed-bed column application, and yields 513 and 990 BV effluents for Cd(II) and Cu(II) to achieve their discharge standards, respectively. The spent HFO-ABC could be in situ regenerated using binary HCl-CaCl 2 solution with desorption efficiency higher than 95%. All results manifest that increasing charged functional groups via HNO 3 treatment is an effective measure for boosting sorption performance of biochar-based nanocomposites.
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
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Shunli Wan,Lian Qiu,Yan Li,Junjie Sun,Bin Gao,Feng He,Wubo Wan
Antimony and copper pollution pose significant threat to water quality security, and their advanced treatment is still a great challenge. In this study, we fabricated a hybrid adsorbent (denoted as MO-L-BC) through dispersing manganese oxide (MO) inside a biochar with enlarged pore structure (namely L-BC). The used carrier L-BC possessed a high proportion of large pores (>2 nm) (87%), and thus lowered the diffusion resistance of target pollutants in pore region of MO-L-BC. Consequently, Sb(III) and Cu(II) adsorption onto MO-L-BC achieved equilibrium within 15 min, and their effective coefficients of intra-particle diffusion (D) were calculated to be 8.6 × 10 −8 and 1.5 × 10 −7 cm 2 s −1 , respectively, which were only one-order magnitude lower than that in aqueous phase. XPS analysis indicated that 53.3% of the sorbed Sb(III) was oxidized to Sb(V) by the impregnated MO. Coexisting substances such as HCO 3 − , SO 4 2− , NO 3 − , Ca 2+ , Mg 2+ and humic acid up to 20 times higher concentration than target contaminants (Sb(III) or Cu(II)) caused only < 20% drop in sorption capacity of MO-L-BC, and the mutual effect of Sb(III) and Cu(II) was also not noticeable. The fixed-bed column adsorption tests showed that MO-L-BC can achieve the tertiary treatment of either the singly polluted (Sb(III) or Cu(II)) or the co-contaminated wastewater at a high flow rate of 0.27 m h −1 , with effective treatment volumes larger than400 BV, and the saturated MO-L-BC can be effectively regenerated. MO-L-BC is a promising engineered biochar to treat Sb(III) and/or Cu(II) contaminated water especially under high-flow conditions.
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
Nanomaterials
·
2022
·Vol. 12
·期 16
·2755
·
IF 5.719
Yue Xu,Huan Liao,Jing Zhang,Haijun Lu,Xinghua He,Yi Zhang,Zhenbin Wu,Hongyu Wang,Minghua Lu
Recovery phosphorus (P) from P-contaminated wastewater is an efficient and environmentally friendly mean to prevent water pollution and alleviate the P shortage crisis. In this study, oyster shell as calcium sources and peanut shells as carbon sources (mass ratio 1:1) were used to prepare a novel Ca-modified biochar (OBC) via co-pyrolysis, and its potential application after P adsorption as a P biofertilizer for soil was also investigated. The results shown that OBC had a remarkable P adsorption capacity from wastewater in a wide range of pH 4–12. The maximum P adsorption capacity of OBC was about 168.2 mg/g with adsorbent dosage 1 g/L, which was about 27.6 times that of the unmodified biochar. The adsorption isotherm and kinetic data were better described by Langmuir isotherm model (R2> 0.986) and the pseudo second-order model (R2> 0.975), respectively. Characterization analysis of OBC before and after P adsorption by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and specific surface area and porosity analyzer (BET) indicated that the remarkable P adsorption capacity of OBC was mainly ascribed to chemical precipitation, electrostatic adsorption, and hydrogen bonding. Pot experiment results showed that OBC after P adsorption could significantly promote the germination and growth ofSpinacia, which manifested that OBC after P adsorption exhibited a good ability to be reused as P fertilizer for soil.Keywords:phosphorous;oyster shell;peanut shell;biochar;P biofertilizer
研究领域:
环境科学
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农业科学
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DOI
PubMed
高影响因子
ACS ES&T Water
·
2021
·
IF 0
Gang Chu,Jing Zhao,Yu Zhang,Kai Sun,Xiaohong Liu,Youbin Si,Bo Pan,Christian E. W. Steinberg
Biochar is a multiphase carbonaceous structure with inherent minerals. The role of minerals in organic sorption is essential for biochar application in environmental remediation. In this work, combined with X-ray diffraction (XRD) and 13C nuclear magnetic resonance (NMR) techniques, the composition of minerals and the sorption behavior of bisphenol A (BPA) were investigated. A demineralization treatment was applied to remove surface minerals containing silicon (Si), aluminum (Al), and calcium (Ca) elements, resulting in the exposure of micropores in aromatic carbon. These minerals could serve as vital sites to facilitate BPA sorption due to the complexation mechanism. The role of mineral elements in enhanced sorption could be in the sequence of Al mineral > Ca mineral > no mineral. Density functional theory (DFT) calculation confirmed the occurrence of complexation between minerals and BPA as evidenced by sorption energy. After demineralization, declined release ratio (RR) values implied that adsorbed BPA on demineralized biochars was more difficult to desorb than on original biochars owing to the restriction of micropores. The enhanced energy gap also verified that BPA molecules were more stable on demineralized biochars. This research casts new light on recognizing biochar minerals in relation to their underlying sorption mechanism for phenolic compounds.
研究领域:
环境科学
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材料科学
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DOI
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Hugang Li,Yongfei Gao,Hongxu Chen,Hui Zhou,Yuhong Qin,Shuai Niu
Addressing the challenges associated with phosphorus and arsenic coexistence is not only a scientific necessity but also a practical imperative for the growing importance of sustainable sewage sludge management. This study investigates the speciation and crystallization transformations of phosphorus and arsenic in sewage sludge under Fe(III)-catalyzed hydrothermal treatments with pH ranging from 2.5 to 8.5. Arsenic and phosphorus, both belonging to the same group of the periodic table, exhibit dynamic interactions during Fe(III)-catalyzed hydrothermal treatments. Results reveal that hydrochar yield decreases with lower pH, while the proportion of arsenic(V) in hydrochar decreases with increasing calcium ion concentration. Scanning electron microscopy shows that fibrous and needle-like structures on hydrochar surfaces enhance the adsorption and enrichment of dissolved phosphorus and arsenate, forming vivianite-P and vivianite-like mineral phases. Notably, the crystallization of scorodite (FeAsO 4 ·2H 2 O) facilitates the immobilization of As(III) in near-neutral environments. These findings deepen our understanding of the synergistic morphological processes and crystallization transformations of arsenic and phosphorus during Fe(III)-catalyzed hydrothermal treatments, offering significant implications for P-rich biochar fertilization and application.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Quan Chen,Hongjuan Feng,Jihong Dong,Yu Huang,Peng Yi,Min Wu,Bo Pan
Sorption and degradation occur simultaneously during the removal of aromatic organics by biochar. However, the unclear association between sorption and degradation limited our understanding of the underlying mechanisms of organic removal by biochars. Herein, the removal of monocyclic 2,6-dimethylphenol (DMP) and bicyclic bisphenol A (BPA) by raw and potassium hydroxide modified biochars was comparatively investigated by batch removal experiments and theoretical calculations. Under identical initial concentrations, biochar displayed lower sorption but higher degradation for DMP compared to BPA, whilst higher sorption corresponded to greater degradation for the same chemical. Sorption mechanisms revealed by molecular dynamic simulations include π-π, hydrophobic, and hydrogen bonding interactions. Density functional theory calculations identified the preferred degradation sites on biochar for adsorbed organics are graphitic nitrogen, defects, carboxyl, and hydroxyl functional groups. Analysis of free radicals and degradation intermediates concluded that the degradation pathways involve both free radical pathways and electron transfer processes for DMP, while only free radicals for BPA. Experimental and computational results indicated an increase in ring quantity can lead to higher sorption affinity but lower degradability of aromatic organics by biochar. Findings of this research provide theoretical support for the advancement of biochar based aromatic contaminant mitigation strategies.
研究领域:
环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2020
·
IF 7.539
Jiawei Dai,Xiangfu Meng,Yuhu Zhang,Yunjie Huang
Rice straw derived biochar shows low-cost superiority as a potential adsorbent in tetracycline (TC) removal, but limited by its poor adsorption capacity and N, P leaking risk. Herein, an alkali-acid combined and magnetization method was proposed for its modification. The sorption kinetic and isotherm data showed modification enhanced the performance for tetracycline removal with adsorption capacity up to 98.33 mg·g −1 . The strong adsorption mechanisms were dominated by hydrogen bonding and pore-filling effect due to the increase of specific surface area and pore volume. Furthermore, the effect of pH was insignificant over a pH range from 3 to 10. The strong competition between ionic and TC was identified, where Ca 2+ and PO 4 3− markedly inhibited the sorption. The enhanced TC adsorption, strong N and P removal, easy magnetic recovery, and good reusability in water samples entrusted it with good potential for wastewater treatment and rice straw resource disposal.
研究领域:
环境科学
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生物学
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产品关联
DOI
PubMed
高影响因子
International Journal of Environmental Research and Public Health
·
2020
·Vol. 17
·期 4
·1324
·
IF 2.849
Yanchang Zhang,Lin Zhao,Yongkui Yang,Peizhe Sun
Biochar (BC)-supported nanoscale zero-valent iron (nZVI-BC) was investigated as a heterogeneous Fenton-like activator to degrade the antibiotic ornidazole (ONZ). The characterization of nZVI-BC indicated that BC could enhance the adsorption of ONZ and reduce the aggregation of nZVI. Thus, nZVI-BC had a higher removal efficiency (80.1%) than nZVI and BC. The effects of parameters such as the nZVI/BC mass ratio, pH, H2O2concentration, nZVI-BC dose, and temperature were systematically investigated, and the removal of ONZ followed a pseudo-second-order kinetic model. Finally, possible pathways of ONZ in the oxidation process were proposed. The removal mechanism included the adsorption of ONZ onto the surface of nZVI-BC, the generation of •OH by the reaction of nZVI with H2O2, and the oxidation of ONZ. Recycling experiments indicated that the nZVI-BC/H2O2system is a promising alternative for the treatment of wastewater containing ONZ.Keywords:nanoparticles;biochar;wastewater treatment;ornidazole
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Sustainability
·
2018
·Vol. 10
·期 11
·4250
·
IF 2.075
Shuang Xu,Weiguang Yu,Sen Liu,Congying Xu,Jihui Li,Yucang Zhang
A low-cost biochar was prepared through slow pyrolysis of banana pseudostem biowaste at different temperatures, and characterized by surface area and porosity analysis, scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). It was shown that the biochar prepared at low pyrolysis temperature was rich in oxygen-containing groups on the surface. Adsorption experiments revealed that the biochar prepared at 300 °C (BB300) was the best adsorbent for Cr(VI) with 125.44 mg/g maximum adsorption capacity at pH 2 and 25 °C. All the adsorption processes were well described by pseudo-second-order and Langmuir models, indicating a monolayer chemiadsorption. Furthermore, it was demonstrated that adsorption of Cr(VI) was mainly attributed to reduction of Cr(VI) to Cr(III) followed by ion exchange and complexation with the biochar.Keywords:biochar;banana pseudostem;chromium;adsorption mechanism
研究领域:
环境科学
·
材料科学
✓ 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）