JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Yali Zhai,Youzhi Dai,Jing Guo,Lulu Zhou,Minxing Chen,Hantong Yang,Liangping Peng
In the study, a series of novel Z-scheme biochar@CoFe 2 O 4 /Ag 3 PO 4 photocatalysts were synthesized and employed to degrade bisphenol A under visible light irradiation (λ ≥ 420 nm). The structural morphology, optical properties and physicochemical properties of composites were characterized by means of TEM , XRD , FT-IR, XPS , UV–Vis, BET, EIS and VSM analysis. The photocatalytic performances of the photocatalysts were evaluated systematically. The MBA-3 photocatalyst exhibited the highest photocatalytic and mineralization ability within 60 min among all photocatalysts, 91.12% and 80.23%, respectively. After four cycles, the degradation of BPA still kept the photocatalytic activity of 73.94%, and the removal rate of TOC remained 58.96%. Moreover, the active species in the photocatalytic process were evaluated, and we proposed the Z-scheme photocatalytic mechanism for highly efficient degradation of BPA. According to the GC-MS results, the photodegradation pathway of BPA is also suggested. The present study has provided a valuable way of using the magnetic biochar in the design of new and efficient system for the degradation of organic pollutions in waste water .
研究领域:
环境科学
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材料科学
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化学工程
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DOI
PubMed
高影响因子
RSC Advances
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2019
·Vol. 9
·期 8
·4162-4171
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IF 3.049
Zhendong Zhao,Qianqian Wu,Tiantian Nie,Wenjun Zhou
Atrazine (ATZ) adsorption in two natural soils amended with biochars produced from different feedstocks at 300, 500, and 700 °C were investigated; further, the relationships between the surface and partition adsorption capacities of ATZ in biochar-amended soils with biochar characteristics were quantitatively evaluated. The results revealed that high aromaticity, hydrophobicity, and low polarity of biochar facilitated ATZ adsorption. The addition of selected biochars significantly increased the adsorption of ATZ on paddy soil (PS) and black soil (BS) by 5.2–7.5 times and 2.3–4.2 times, respectively. On the contrary, the degree of increase in surface adsorption was much higher than that in partition adsorption, mainly due to the role of the specific adsorption of ATZ on biochar. Meanwhile, the respective contributions of surface and partition adsorptions to the total ATZ adsorption on biochar-amended soil changed with different addition amounts of biochar. The multiple nonlinear regression analysis demonstrated the linear dependence of H/C ratio, (O + N)/C ratio, and specific surface area (SSA) of biochar on the surface adsorption capacity of biochar-amended PS and BS, as well as the linear dependence of organic carbon and ash contents on the partition adsorption capacity of biochar-amended PS and the linear dependence of the H/C ratio and SSA on the partition adsorption capacity of biochar-amended BS. In biochar-amended soil systems, interactions between biochar and soil could affect ATZ adsorption, and organic matter in biochar might compensate for the role of soil organic matter in the competition for adsorption sites with a decrease in the biochar pyrolysis temperature.
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
Water
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2022
·Vol. 14
·期 24
·4085
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IF 3.53
Wenxuan Li,Xueli Wang,Haizhen Kong,Dan Zhang
Increased anthropogenic activities have caused cadmium pollution in Qinghai–Tibet Plateau, which is harmful to human health. This paper investigated aqueous Cd2+adsorption using biochar of three typical vegetation types in cold and arid areas of the Qinghai–Tibet Plateau: (i) Chinese wolfberry (GBB), (ii) highland barley (QBB), and (iii) seabuckthorn (SBB). In order to investigate the effect of pyrolysis temperature on the performance of biochar for cadmium adsorption, three types of biochar were prepared at 350 °C, 500 °C, and 650 °C. The as-prepared biochar was characterized by scanning electron microscopy (SEM), Thermogravimetric (TG), Fourier transform infrared spectroscopy (FT-IR), and Brauer–Emmett–Teller (BET) analysis. The results showed that the biochar prepared at 650 °C had the best adsorption capacity. Compared with QBB and SBB, the GBB had a higher Cd2+adsorption capacity of 19.48 mg/g. Moreover, the effects of biochar dosage, experimental temperature, and biochar preparation temperature on the adsorption of Cd2+by biochar and the interaction between the factors were investigated using Box–Behnken Design (BBD). As a result, the amount of biochar dosage showed the most obvious influence on Cd2+adsorption capacity, followed by sample preparation temperature and experimental adsorption temperature. This study paves the way for the design of biochar for Cd2+adsorption in wastewater.Keywords:biochar;adsorption;response surface methodology;heavy metal cadmium
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
Toxics
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2025
·Vol. 13
·期 6
·458
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IF 4.1
Hang Liu,Runlin Yao,Mingling Yu,Zongda Ye,Yingrui Lu,Xiaolong Yu,Jin Tang,Jianteng Sun
Hexavalent chromium (Cr(VI)) is of significant interest in the environmental field due to its high toxicity. Biochar is commonly used as an adsorbent for Cr(VI) removal from wastewater. However, its lower removal efficiency remains a persistent challenge. This study develops an iron-modified rice straw biochar through a simple precipitation and pyrolysis method and applies it for Cr(VI) removal in wastewater, which could convert waste into treasure and improve the adsorption performance of adsorbent. In the adsorption experiments, the results revealed that the adsorption efficiency of Cr(VI) reached 95.54% within 480 min (conditions: adsorbent dosage 2.67 g/L, pH 2.5, temperature 25 ± 2 °C). The Langmuir isotherm model was more suitable to describe the adsorption behavior of Cr(VI) by Fe-BC, and the fitted adsorption capacity achieved 10.03 mg/g. The experimental process was better described by the pseudo-second-order kinetic model, indicating that the adsorption process chemical adsorption was the rate-limiting step. The thermodynamic experiments revealed that the adsorption process of Cr(VI) by Fe-BC was spontaneous and endothermic. Column experiments demonstrated that a lower flow speed was beneficial to adsorption performance. Mechanistic studies highlighted the synergistic roles of electrostatic attraction, ion exchange, and reduction in Cr(VI) removal. These findings provide novel perspectives and innovative approaches for the development and application of adsorbents.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
PubMed
高影响因子
Scientific Reports
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2025
·Vol. 15
·期 1
·1-11
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IF 3.9
Li Yingquan,Zhao Baowei,Shang Tingting
Both biochar and humic acid adsorb heavy metals, but their combined effect has rarely been reported. In this paper, the adsorption of Cu(II) by single biochar (BS) and biochar with humic acid (BS + HA) in aqueous solution were studied, and the effects of solution pH, initial Cu(II) concentration, temperature and Ca 2+ ionic strength on the adsorption of Cu(II) were investigated. The results showed that under the same time, the adsorption of Cu(II) under the BS and BS + HA systems showed an increasing trend with the increase of pH, and the maximum adsorption capacity of the BS + HA system was reached at a pH of about 4, while the BS system alone exhibited a noticeable lag. The increase of the initial concentration of Cu(II) also promoted the adsorption capacity of the two systems, and the adsorption of Cu(II) by the BS and the BS + HA systems was a spontaneous adsorption process, and the elevation of the temperature effectively promoted the adsorption of Cu(II). The addition of Ca 2+ could promote the adsorption efficacy of the single BS system, but had little effect on the BS + HA system. Overall, the BS + HA system showed better adsorption than the single BS system, and the addition of humic acid enhanced the adsorption performance of biochar to Cu(II). The results could provide a theoretical basis for the combined action of biochar and humic acid on the remediation of Cu(II) contaminated water.
研究领域:
环境科学
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土壤学
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水污染修复
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DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2022
·
IF 7.129
Yixuan Liang,Hanbing Li,Xiaotong Li,Qiyu Zhang,Jiaying Fei,Sumei Li,Sha Chen
Around 6.6 million tons of spent coffee is produced per year, resulting in resources loss and potential environmental risks. Hence, a green technique is required to reuse the spent coffee grains. In this study, coffee grounds were burnt at 900 °C to generate the biochar (BC) for the synthesis of the porous adsorbent (ZIF-8 @BC) by growing ZIF-8 on the surface of BC. We applied the well-prepared ZIF-8 @BC to remove Congo red (CR) in water. The maximum adsorption capacity of ZIF-8 @BC on Congo red in water was up to 1080.4 mg/g, which was significantly higher than that of many different types of BCs reported in previous studies. The reasons for its highly efficient adsorption of CR probably was attributed to metal ions and coordinatively unsaturated sites in the material. Also, BC enabled the less aggregation of ZIF-8 to provide sufficient specific surface area for CR adsorption. From the analysis of the pseudo-second-order kinetic model and Langmuir model, the adsorption of ZIF-8 @BC on CR was a homogeneously chemical adsorption process regulated by electrostatic interaction, π-π stacking and metal coordination.
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
ACS Sustainable Chemistry & Engineering
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2016
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IF 5.267
Yuan-Ying Wang,Xiang-Rong Jing,Ling-Li Li,Wu-Jun Liu,Zhong-Hua Tong,Hong Jiang
Biochar is a solid material obtained from thermochemical conversion of biomass in an oxygen-limited environment. It is widely used as a soil remediator and carbon sequestrator. However, its biotoxicity to the ecosystem remains unclear. In this study, we assess the toxic effects of three fast pyrolytic biochar extract solutions (rice husk, saw dust, Acorus calamus) on a miocroorganism (Pseudomonas aeruginosa), a plant (Triticum spp.), and an animal (Caenorhabditis elegans). Systematic toxicity tests indicate that the biotoxicity of biochars varies with their biomass sources. Biochars derived from rice husk and sawdust have negligible toxic effects on all the tested organisms, suggesting that biochars obtained from agricultural waste are safe for soil application. By contrast, biochar derived from Acorus calamus shows significant toxicity on all tested organisms at relative high dosage, indicating that risk assessment is necessary before its environmental use. Furthermore, this study found that use of the UV254 value is more practical than the SUV254 value for evaluation of biochar biotoxicity. Finally, gel permeation chromatography (GPC) suggests that certain small aromatic molecules may be responsible for the toxicity of biochar derived from Acorus calamus.
研究领域:
环境科学
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毒理学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2019
·Vol. 26
·期 21
·21609-21618
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IF 2.914
Tan Guangcai,Mao Yi,Wang Hongyuan,Junaid Muhammad,Xu Nan
Biochar (BC) and activated carbon (AC) were both produced from corn straw. Biochar-supported zerovalent iron (BC-ZVI) and activated carbon-supported zerovalent iron (AC-ZVI) were synthesized and applied for Se(IV)/Se(VI) removal. The sorption capacity of BC-ZVI for Se(IV) and Se(VI) was reported at 62.52 and 35.39 mg g −1 , higher than that of AC-ZVI (56.02 and 33.24 mg g −1 ), respectively, due to its higher iron content and more positive charges. The spectroscopic analyses showed that Se(IV)/Se(VI) were reduced to Se(0)/Se(-II) of less toxicity and solubility. The effects of various factors such as pH, ionic strength, co-existing cations and anions, and natural organic matter (NOM) were also investigated. Ionic strength showed no significant effect on Se(IV)/Se(VI) removal, but pH was critical. The presence of NO 3 − and SO 4 2− did not cause obvious inhibition to the removal, while PO 4 3− inhibited the sorption capacity of BC-ZVI and AC-ZVI for Se(IV)/Se(VI) significantly. Common cations (K + , Ca 2+ , and Mg 2+ ) were found to slightly enhance the removal, while NOM significantly decreased the sorption capacity of BC-ZVI and AC-ZVI for Se(IV)/Se(VI). Besides, NOM showed stronger inhibition effect on AC-ZVI than that on BC-ZVI. These results indicated that BC-ZVI, compared with AC-ZVI, could be a promising sorbent to remove Se(IV)/Se(VI) due to its low cost and high efficiency.
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
Biomass Conversion and Biorefinery
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2023
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IF 4
Xu Tingting,Gao Xin,Li Yuanzhang,Lin Changqu,Ma Peipei,Bai Zhongzhong,Zhou Jun,Wu Hongli,Cao Fei,Wei Ping
Isatis indigotica Fort. root (Ban-lan-gen, IIR), a traditional Chinese medicine (TCM), has an ancient and well-documented history for its medicinal properties. Aside from epigoitrin, indole alkaloids, and their corresponding derivatives as medicinal ingredients, it also contains lots of biomass such as starch. Herein, a new starch was isolated from IIR and the physicochemical properties such as amylose content, moisture content, ash content, morphology, thermal properties, and crystallography were characterized systematically. The amylose content of IIR starch was 19.84 ± 0.85%, and the size and shape of starch granules is ellipsoidal shape with sizes from 2 to 10 μm. IIR starch exhibited a C-type pattern and had 25.92% crystallinity (higher than that of corn starch). The gelatinization temperature of IIR starch was 58.68–75.41 °C, and its gelatinization enthalpy was Δ H gel = 4.33 J/g. After decocting, the IIR’s residues can be used to prepare anhydro-sugars in a polar aprotic solvent. The total carbon yield of levoglucosan (LG), levoglucosenone (LGO), 5-hydroxymethylfurfural (HMF), and furfural (FF) could reach 69.81% from IIR’s decoction residues in 1,4-dioxane with 15 mM H 2 SO 4 as the catalyst. Further, the residues after dehydration were prepared into biochar by thermochemical conversion and the BET surface area of biochar was 1749.46 m 2 /g which has good application prospect in soil improvement and alleviates obstacles of IIR continuous cropping.
研究领域:
药用植物学
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生物质化学
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中药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Sciences
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2018
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IF 3.12
Qingyuan Hu,Yuling Zhu,Baowei Hu,Songhua Lu,Guodong Sheng
The magnetic iron oxide (Fe 3 O 4 ) nanoparticles stabilized on the biochar were synthesized by fast pyrolysis of Fe(II)-loaded hydrophyte biomass under N 2 conditions. The batch experiments showed that magnetic biochar presented a large removal capacity (54.35 mg/g) at pH 3.0 and 293 K. The reductive co-precipitation of U(VI) to U(IV) by magnetic biochar was demonstrated according to X-ray diffraction, X-ray photoelectron spectroscopy and X-ray absorption near edge structure analysis. According to extended X-ray absorption fine structure analysis, the occurrence of U-Fe and U-U shells indicated that high effective removal of uranium was primarily inner-sphere coordination and then reductive co-precipitation at low pH. These observations provided the further understanding of uranium removal by magnetic materials in environmental 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
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Shakeel Ahmad,Feilong Gao,Honghong Lyu,Jingkang Ma,Beibei Zhao,Siyu Xu,Cholnam Ri,Jingchun Tang
Synthesizing new composites with better efficiency and stability from abundant sources offers an appealing prospect for removal of heavy metals and organic pollutants to address water pollution concerns. In this study, iron (Fe) and nitrogen (N) doped biochar (BC) composites were investigated for hexavalent chromium (Cr(VI)) and nitrobenzene (NB) removal. Specifically, temperature-dependent Fe 1 -N 1 -BC 1 composites were synthesized with different mass ratios of FeCl 3 as Fe, melamine as N, and pinewood sawdust (PWS) as BC precursors via carbothermal reduction at 300, 500, 700, and 900 °C. Detailed characterizations indicating low-temperature incorporated superior N and high-temperature incorporated more Fe species in Fe 1 -N 1 -BC 1 composites. The Cr(VI) and NB were removed with Fe 1 -N 1 -BC 1 , and experimental results attested with standard isotherm and kinetic models. The N species (pyridinic-N, pyrrolic-N, graphitic-N, quaternary-N, and oxidized-N) and Fe species (Fe 3 C, Fe 0 , Fe 2p 3/2 , and Fe 2p 1/2 ) in temperature-dependent Fe 1 -N 1 -BC 1 composites participated in pollutants removal. Mass ratio of 1:1:1 of Fe, N, and BC was effective, and under optimum conditions, low-temperature (Fe 1 -N 1 -BC 1 -300) and high-temperature (Fe 1 -N 1 -BC 1 -700) composites completely removed Cr(VI) and NB, respectively. In comparison to pinewood sawdust BC (PWBC) and composite of FeCl 3 with PWS (Fe-BC), melamine with PWS (N-BC), and FeCl 3 with melamine (Fe-N), the Fe 1 -N 1 -BC 1 was more efficient due to synergistic effect of Fe, N, and BC for better pollutant interaction and removal. Effect of different factors on pollutants removal with Fe 1 -N 1 -BC 1 was studied to reveal removal mechanism insights. Additionally, Fe 1 -N 1 -BC 1 showed better efficiency in simultaneous removal of Cr(VI) and NB, stability for > 4 months, reusability, and applicability for multiple pollutants. This study offers a benign approach for synthesizing and applying Fe 1 -N 1 -BC 1 for pollutants removal and exploring reaction mechanisms.
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
JOURNAL OF MOLECULAR LIQUIDS
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2022
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IF 6.633
Min Xu,Xiaoli Ma,Yahui Chen,Luzeng Hu,Bo Wang,Muqing Qiu
Nanoscale zero-valent iron/biochar (nZVI/biochar) has been widely utilized in environmental remediation due to its excellent removal efficiency, easy synthesis, low-cost and environmental friendliness. Herein, the removal and interaction mechanism of Cr(VI) removal on nZVI/biochar was investigated by macroscopic and microscopic techniques. Compared to nZVI (25.84 mg/g), the high removal capacity (63.29 mg/g at pH 4.5), excellent reusability and chemical stability of nZVI/biochar were due to various oxygen-bearing functional groups and synergetic interaction. According to analysis of X-ray photoelectron spectroscopy (XPS), X-ray absorption near-edge fine (XANES) and extended X-ray absorption fine structure (EXAFS) spectra, the interaction mechanism of Cr(VI) on nZVI/biochar followed adsorption (complexation, electrostatic interaction), reduction and co-precipitation process with increasing reaction time. These findings are crucial for the application of nZVI/biochar for removal of heavy metals in actual environmental cleanup.
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
高影响因子
危险品化学品经营许可证（带存储）