Russian Journal of Physical Chemistry A
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2021
·Vol. 95
·期 10
·2031-2041
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IF 0.691
Yan Xiaoju,Sun Yue,Ma Cong,Kong Xiangji,Zhang Yan,Tao Wen
Abstract This research compared the adsorption behavior of anionic dye methyl orange (MO) and cationic dye methylene blue (MB) by five carbon materials, i.e. rice husk biochar (RH), sawdust biochar (SD), activated carbon (AC), bamboo biochar (BB) and palm biochar (PB). Scanning electron microscopy (SEM), Boehm titration, Brunauer–Emmett–Teller (BET) analysis and zeta potential were used to characterize the physicochemical properties of the adsorbents. The pH had a great influence on the adsorption processes. The adsorption processes for two dyes followed the pseudo-second order kinetic model. The Langmuir, Freundlich and Temkin isotherm models all showed good fit to the experimental adsorption data. The thermodynamic studies revealed that all the reactions of MO were exothermic processes with decrease in entropy, while those of MB were just the opposite. The adsorption capacity of RH was the highest, which may be due to its physicochemical properties. The adsorption capacities of SD were the smallest, and the poor physiochemical properties of PB caused that the dyes adsorption onto PB was non-spontaneous and non-feasible. All adsorbents showed higher adsorption capacity for MB than that for MO, which may be due to the additional electrostatic attraction effect between adsorbents and cationic MB dye.
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
International Journal of Environmental Research and Public Health
·
2020
·Vol. 17
·期 3
·1075
·
IF 2.849
Jinpeng Wang,Ming Zhang
In this paper, biochar (BC) was prepared from discarded grapefruit peel and modified to prepare magnetic biochar (MBC). Physical and chemical properties of BC and MBC were characterized, and the results showed that the type of iron oxide loaded by MBC was γ-Fe2O3. Compared with BC, MBC has a larger specific surface area and pore volume, with more oxygen-containing functional groups on the surface. BC and MBC were used to adsorb and remove endocrine-disrupting chemical (EDC) bisphenol A (BPA) from simulated wastewater. The results showed that the adsorption kinetics and adsorption isotherm of BPA adsorption by BC and MBC were mainly in accordance with the pseudo-second-order kinetics model and the Langmuir model. This indicates that the adsorption of BPA on BC and MBC is mainly a chemically controlled monolayer adsorption. Adsorption thermodynamics show that BC and MBC adsorption of BPA is a spontaneous exothermic reaction, and lowering the temperature is conducive to the adsorption reaction. The effect of solution pH on the adsorption of BPA by both was significant. The optimum pH for BC and MBC to absorb BPA was 6 and 3, respectively. The concentration of Na+in the range of 0–0.10 mol·L−1can promote the adsorption of BPA to MBC. MBC loaded with γ-Fe2O3not only has excellent magnetic separation ability, but can also reach about 80% of the initial adsorption capacity after four cycles of adsorption. By analyzing the adsorption mechanism, it was found that the H-bond and the π–π electron donor–acceptor interaction (EDA) were the main forces for BC and MBC to adsorb BPA.Keywords:biochar;magnetic biochar;adsorption;bisphenol A;γ-Fe2O3
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2020
·Vol. 83
·期 3
·739-750
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IF 1.638
Fan Xiulei,Qian Zheng,Liu Jiaqiang,Geng Nan,Hou Jun,Li Dandan
Application of sewage sludge biochar as an adsorbent for antibiotics treatment has obtained special attention owning to its low cost and surface functionality. Three metal ions were selected to modify sewage sludge biochar through the pyrolysis with the metal loaded method. Fe loaded sewage sludge biochar (BC-Fe), Al loaded sewage sludge biochar (BC-Al) and Mn loaded sewage sludge biochar (BC-Mn) were characterized and used to explore the performance of adsorbing tetracycline (TC), sulfamethoxazole (SMZ) and amoxicillin (AMC). BC-Fe, BC-Al and BC-Mn possessed rougher surfaces, larger specific surface area and better pore structure. Intra-particle diffusion and Langmuir models were more suitable to describe the adsorption process. The maximum adsorption amount of TC, SMZ and AMC could reach 123.35, 99.01 and 109.89 mg/g by BC-Fe. Furthermore, the main mechanism of antibiotics adsorption by metal loaded sewage sludge biochars might be pores filling, Van der Waals forces and H-bonding. The study can not only solve the problems associated with the pollution of antibiotics from wastewater, but also reduced the treatment pressure of sewage sludge effectively. Modification enhanced the microcellular structure and promoted the degree of carbonization. Compared with biochar, metal loaded sewage sludge biochar exhibited better adsorption capacity. Fe ion was demonstrated to be the optimal modified material. Metal loaded sewage sludge biochars avoided the risk of polluting the environment.
研究领域:
环境科学
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水处理
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吸附技术
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废弃物管理
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生物炭改性
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污染控制
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DOI
高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2019
·Vol. 42
·期 6
·1601-1615
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IF 3.252
Tao Huan-yu,Ge Hui,Shi Jianghong,Liu Xiaowei,Guo Wei,Zhang Mengtao,Meng Yaobin,Li Xiao-yan
Abstract In this study, the effect of biochar (BC) derived from Litchi chinensis Sonn. and its modification, including Ca-biochar (Ca-BC) and Fe–Mn-biochar (Fe–Mn-BC), on the transportation of oestrone (E1) in water and soil was investigated. Fe–Mn-BC showed better adsorption ability than other types of biochar (BC, Ca-BC) under different conditions (humic acid, pH, ionic strength) in an aqueous environment. The maximum mass of sorbent at 298 K increased from 1.12 mg g −1 (BC) to 4.18 mg g −1 (Fe–Mn-BC). Humic acid had a greater impact on aqueous E1 adsorption on these biochars than did the pH and ionic strength. Fe–Mn-BC as a soil amendment had a great control of E1 transport in soil, and no leachate of E1 was observed in the column experiment. E1 mobility showed strong retardation in amended soil with Ca-BC ( R f = 11.2) compared with raw soil ( R f = 7.1). These results suggested that Fe–Mn-BC was more effective in controlling E1 transportation, and Fe–Mn-BC could be used as an alternative and inexpensive adsorbent to reduce E1 contaminants from water and soil. Graphic abstract
研究领域:
环境科学
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土壤学
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DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2018
·
IF 3.849
Huaxuan Zhao,Yinhai Lang
A magnetic reed biochar (MRBC) was synthesized through chemical co-precipitation firstly and subsequently pyrolysis. The MRBC and reed biochar (RBC) were characterized by SEM, XRD, FTIR and VSM and were used for the adsorption of florfenicol (FF). Batch experiment results showed that the FF adsorption on MRBC exhibited a pronounced pH-dependent pattern and presented a bell curve. However, the FF adsorption on RBC decreased gradually with the increasing pH values. Ionic strength initially inhibited and then promoted the FF adsorption and the multivalent co-existing anions significantly increased the FF adsorption on MRBC. The FF adsorption was non-spontaneous, exothermic and entropy-decreasing on MRBC and was of a non-spontaneous, endothermic and entropy-increasing nature on RBC. The pseudo second-order model presented better fittings for the FF adsorption kinetic data. Langmuir and Freundlich models can well describe FF adsorption on MRBC and RBC, respectively. The FF adsorption on RBC may be controlled by pore-filling effect and π–π EDA interaction, while hydrogen bonding, pore-filling effect and π–π EDA interaction contributed to the FF adsorption on MRBC. The adsorption–regeneration cycles confirmed that the MRBC was a highly efficient and reusable adsorbent for the removal of FF from aqueous solution.
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
MOLECULES
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2023
·Vol. 29
·期 1
·173
·
IF 4.6
Lingling Rong,Ligui Wu,Tiao Zhang,Cui Hu,Haihui Tang,Hongcheng Pan,Xiaoming Zou
To improve the adsorption efficiency of pollutants by biochar, preparing graphene-like biochar (GBC) or nitrogen-doped biochar are two commonly used methods. However, the difference in the nitrogen doping (N-doping) effects upon the adsorption of pollutants by pristine biochar (PBC) and GBC, as well as the underlying mechanisms, are still unclear. Take the tetracycline (TC) as an example, the present study analyzed the characteristics of the adsorption of TCs on biochars (PBC, GBC, N-PBC, N-GBC), and significant differences in the effects of N-doping on the adsorption of TCs by PBC and GBC were consistently observed at different solution properties. Specifically, N-doping had varied effects on the adsorption performance of PBC, whereas it uniformly improved the adsorption performance of GBC. To interpret the phenomenon, the N-doping upon the adsorption was revealed by the QSAR model, which indicated that the pore filling (VM) and the interactions between TCs with biochars (Ead-v) were found to be the most important two factors. Furthermore, the density functional theory (DFT) results demonstrated that N-doping slightly affects biochar’s chemical reactivity. The van der Waals (vdWs) and electrostatic interactions are the main forces for TCs-biochars interactions. Moreover, N-doping mostly strengthened the electrostatic interactions of TCs-biochars, but the vdWs interactions of most samples remained largely unaffected. Overall, the revealed mechanism of N-doping on TCs adsorption by biochars will enhance our knowledge of antibiotic pollution remediation.
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
Journal of the Taiwan Institute of Chemical Engineers
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2021
·
IF 5.876
Shihan Wang,Siyao Bian,Jianzhuo Liu,Jihui Li,Shuying Xu,Zhenyi Liang
Background Biochar has attracted considerable attention as a low-cost adsorbent comprised of carbon matrix and mineral for treatment of wastewater. The main purpose of this work was to manufacture CaCO 3 -rich biochars using crayfish shell as feedstock for removal of Cu(II) and Pb(II) from aqueous solution. Methods Pristine and magnetic biochars were prepared via direct pyrolysis and K 2 FeO 4 -promoted pyrolysis , respectively, and characterized by element analysis, BET, FTIR, SEM-EDS, XRD and XPS. Moreover, their adsorption capabilities toward Cu(II) and Pb(II) were investigated in aqueous solution. Findings A large amount of CaCO 3 was assembled on the pristine biochar pyrolyzed at 600 °C, leading to 715.10 mg/g and 1682.87 mg/g adsorption capacities for Cu(II) and Pb(II), respectively. Whereas, CaCO 3 and single phase Fe 3 O 4 were simultaneously introduced into the magnetic biochar with K 2 FeO 4 -promoted pyrolysis at 600 °C using 1/1 (g/g) ratio of K 2 FeO 4 to crayfish shell, where 417.05 mg/g and 974.10 mg/g maximum adsorption capabilities were obtained for Cu(II) and Pb(II) with 29.66 emu/g saturation magnetism, respectively. Cu(II) and Pb(II) were mainly adsorbed onto the biochars as carbonates and oxides by their interaction with CaCO 3 and carbon matrix.
研究领域:
环境科学
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材料科学
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废水处理
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2018
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IF 6.653
Guocheng Liu,Hao Zheng,Zhixiang Jiang,Jian Zhao,Zhenyu Wang,Bo Pan,Baoshan Xing
Nano biochar (N-BC) attracts increasing interest due to its unique environmental behavior. However, understanding of its formation, physicochemical characteristics, and stability of N-BC is limited. We therefore examined N-BC formation from bulk biochars (B-BCs) produced from peanut shell, cotton straw, Chinese medicine residues, and furfural residues at 300–600 °C. Carbon stability and colloidal processes of nano peanut shell biochars (N-PBCs) were further investigated. N-BCs formed from pore collapse and skeleton fracture during biomass charring, breakup due to grinding, and sonication. Amorphous fraction in B-BCs was more readily degraded into N-BCs than graphitic component. The sonication-formed N-PBCs contained 19.2–31.8% higher oxygen and fewer aromatic structures than the bulk ones, leading to lower carbon stability, but better dispersibility in water. Heteroaggregation of N-PBCs with goethite/hematite destabilized initially and then restabilized with increasing concentrations of N-PBCs. Compared with stacked complexes of N-PBCs-hematite, the association of goethite with N-PBCs could form interlaced heterostructures, thus shielding positive charges on goethite and causing greater heteroaggregation. These findings are useful for better understanding the formation of N-BCs and their environmental fate and behavior in soil and water.
研究领域:
环境科学
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土壤学
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化学
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DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
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2024
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IF 9.7
Qinglian Wu,Lin Deng,Tian Lan,Hui Wang,Kaiming Wang,Huacheng Zhu,Yanping Zhou,Wanqian Guo
The integration of biochar into microbial Chain Elongation (CE) proves to be an effective tool of producing high-value bio-based products. This study innovatively applied biochar fabricated under microwave irradiation with carbon fiber cloth assistance into CE system. Results highlighted that microwave biochar achieved maximal CE efficiency yielding 8 g COD/L, with 3-fold increase to the blank group devoid of any biochar. Microwave biochar also obtained the highest substrate utilization rate of 94 %, while conventional biochar group recorded 90 % and the blank group was of 74 %. Mechanistic insights revealed that the reductive surface properties facilitated CE performance, which is relevant to fostering dominant genera of Parabacteroides , Bacteroides , and Macellibacteroides . By metagenomics, microwave biochar up-regulated functional genes and enzymes involved in CE process including ethanol oxidation, the reverse β-oxidation pathway, and the fatty acid biosynthesis pathway. This study effectively facilitated caproate production by utilizing a new microwave biochar preparation strategy.
研究领域:
环境工程
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微生物学
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生物技术
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DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
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2023
·
IF 6.6
Dongpeng Mao,Penghu Duan,Xinyao Wang,Peng Wang,Chuanyu Qin,Yunxian Piao
Benzo[ a ]pyrene (BaP), as a typical polycyclic aromatic hydrocarbon , is severely hazardous to human for having great carcinogenic and teratogenic activities. Here, we propose a cascade electrochemical reaction-based BaP detection method by using novel synthesized reduced and hierarchically porous biochar (RP-BC) as conductive and analysts binding material. The RP-BC was synthesized by green hydrothermal reduction of sugarcane derived biochar, which was demonstrated to have huge specific surface area with hierarchically porous structures, great content of sp 2 carbon, and fast electron transfer ability. The RP-BC film coated on glassy carbon electrode could preferentially adsorb and enrich BaP by strong π-π electron donor-acceptor (EDA) interaction and pore interception effect, so fast (5 min) and selective detection of BaP was achieved. Moreover, the low detection limit was 0.090 nmol·mL −1 with linear range being 0.32 to 80 nmol·mL −1 . In addition, the detection of BaP in groundwater and tap water was realized with satisfactory results, suggesting the potential of practical environmental monitoring.
研究领域:
环境科学
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材料科学
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分析化学
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产品关联
DOI
高影响因子
ENVIRONMENTAL MONITORING AND ASSESSMENT
·
2024
·Vol. 196
·期 9
·1-12
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IF 2.9
Ni Zifan,Chen Xuehai,Cui Min,Li Jia
The small particle size of nanoplastics allows them to migrate through soil and make them highly bioavailable, posing a potential threat to groundwater. Measures are urgently needed to reduce the migration of nanoplastics in soil. However, there is limited research available on this topic. In this study, two types of iron-modified biochar (magnetic corncob biochar (MCCBC) and magnetic walnut shell biochar (MWSBC)) were selected and their effects on the transport of polyvinyl chloride nanoplastics (PVC-NPs) in natural sandy soil columns under different ionic types and strengths were investigated. The results show that the transport of PVC-NPs in single sandy soil columns was rapid and efficient, with the estimated breakthrough rate of 85.10%. However, the presence of MCCBC and MWSBC (0.5%, w/w) significantly inhibited the transport of PVC-NPs in sandy soil columns ( p < 0.05), and MCCBC had a stronger inhibitory effect on the transport of PVC-NPs than MWSBC. This can be attributed to the fact that the adsorption of PVC-NPs on adsorbents followed the order as: MCCBC > MWSBC > sandy soil. The retention of PVC-NPs by MCCBC and MWSBC is determined by ionic type and ionic strength. The presence of coexisting ions enhanced the inhibitory effect of iron-modified biochar on the transport of PVC-NPs, with the following order: Ca 2+ > SO2- 4 > Cl − > NO- 3. The inhibitory effect of MCCBC and MWSBC on the transport of PVC-NPs in soil columns increased with increasing ionic strengths. Furthermore, MCCBC and MWSBC inhibited the migration of PVC-NPs in a rainwater-soil system. The mechanisms by which MCCBC and MWSBC affect the transport of PVC-NPs in soil columns were considered to enhancing adsorption and decreasing soil pore volume. The results provide new insights into the management of soil nanoplastic pollution.
研究领域:
环境科学
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土壤学
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污染控制
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产品关联
DOI
PubMed
高影响因子
Forests
·
2024
·Vol. 15
·期 4
·622
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IF 2.4
Fangchao Zhang,Weiwei Lu,Fengjie Jin
The stability of biochar is fundamental to its soil carbon (C) sequestration potential. The relative importance of chemical recalcitrance and the soil microbial community on biochar stability is still unclear. To unveil the question, we conducted a 60-day incubation to explore the stability of two rice-straw-derived biochars pyrolyzed at 300 and 500 °C (denoted as BS300 and BS500), as well as the relative contribution of the soil microbial community and biochar chemical recalcitrance to biochar stability in a poplar plantation soil. Biochar-derived cumulative carbon dioxide (CO2) emission was estimated to be 41.3 and 6.80 mg C kg−1, accounting for 0.73 and 0.11% of the amended biochar-derived organic C (OC) in BS300 and BS500 treatments, respectively. The mean retention time (MRT) estimated by double-exponential model fitting was 49.4 years for BS300 and 231 years for BS500. Compared to control, BS300 and BS500 decreased β-D-glucosidase activity by 20.9 and 18.0%, while they decreased phenol oxidase activity by 31.8 and 18.9%, respectively. Furthermore, BS300 increased the soil microbial metabolic quotient (qCO2) by 155%, but BS500 decreased it by 13.4%. In addition, BS300 resulted in a 520% higher biochar-derived hot-water-extractable OC than BS500. Partial least-squares path modeling (PLSPM) showed that the path efficients of biochar’s chemical recalcitrance and microbialqCO2were 0.52 and 0.25, respectively, and that of the soil microbial activity is neglected. We conclude from this short-term study that chemical recalcitrance imposed a greater effect than soil microbial community on biochar stability.
研究领域:
土壤科学
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环境科学
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微生物学
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DOI
高影响因子
危险品化学品经营许可证（带存储）