PLoS One
·
2023
·Vol. 18
·期 8
·e0290714
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IF 3.7
Xiaomei Wu,Meifeng Ye,Jinglong Wang,Feilong Wu,Cenwei Liu,Zhangting Li,Daiyan Lin,Rilong Yang
The utilization of biogas slurry is critical for the sustainable development of animal husbandry. Biomass carbon adsorption is a feasible method for the recycling of nutrients from biogas slurry. However, research on the co-adsorption of ammonia nitrogen and phosphate is scarce. Herein, soybean straw was utilized as the raw material to prepare Ca 2+ -modified biochar (CaSSB), which was investigated for its ammonia nitrogen and phosphate adsorption mechanisms. Compared with natural biochar (SSB), CaSSB possesses a high H/C ratio, larger surface area, high porosity and various functional groups. Ca 2+ -modified soybean straw biochar exhibited excellent adsorption performance for NH 4 + –N (103.18 mg/g) and PO 4 3− −P (9.75 mg/g) at pH = 6, using an adsorbent dosage of 2 g/L. The experimental adsorption data of ammonia nitrogen by CaSSB corresponded to pseudo-second-order kinetics and the Langmuir isotherm model, suggesting that the adsorption process was homogeneous and that electrostatic attraction might be the primary adsorption mechanism. Meanwhile, the adsorption of phosphate conformed to pseudo-second-order kinetics and the Langmuir–Freundlich model, whose mechanism might be attributed to ligand exchange and chemical precipitation. These results reveal the potential of CaSSBs as a cost-effective, efficient adsorbent for the recovery of ammonium and phosphate from biogas slurry.
研究领域:
环境科学
·
农业科学
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Jian Tian,Lu Wang,Lixue Qi,Qun Li,Daohua Sun,Qingbiao Li
As an abundant and renewable biological resource, straw has been attracting wide attention due to its distinctive tubular structure and property. Herein, soybean straw was pretreated by KOH and was used as a support for Pt nanoparticles (NPs) to realize efficient benzene combustion. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images of straw-derived samples illustrated the channel wall with open macropores and uniform distribution of Pt NPs in the straw skeleton. As a result, the temperature for 90% benzene conversion (T90%) by Pt/KAC-3 (Pt/KAC-n, where n represents the mass ratio of straw to KOH that was varied between 1:1, 1:2, and 1:3) was determined to be 179 °C under a space velocity (SV) of 120 000 mL/(g·h). Additionally, thermal stability was enhanced to nearly 96 h. This performance is predominantly attributed to its inherent channel structure, which has open and accessible pores, resulting in a uniform distribution of Pt NPs. Such structure enables the rapid transfer of benzene molecules between channels and ensures the accessibility of Pt NPs. Furthermore, the diffusion properties were confirmed by Fick’s second law. This study demonstrated a design of more efficient catalysts while using a renewable and abundant biomaterial.
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
FUEL
·
2021
·
IF 6.609
Zhi-Cong Wang,Dabo Chen,Ya-Qi Shan,Lin-Xin Lin,Pei-Gao Duan
In this study, a high-boiling point fraction (HBF, 141-220 °C) from vacuum distillation of a biocrude produced from hydrothermal liquefaction of soybean straw was hydrotreated in a hydrogen donor solvent (HDS) mixture consisting of tetralin and decalin at a mass ratio of 1:1. Effects of temperature (300–450 °C), time (1–6 h), H 2 pressure (0.01–10 MPa), and Pt/C loading (0–40 wt%) on the products distribution and properties of the treated oil were examined. Increasing the temperature, time, and catalyst loading or decreasing the H 2 pressure would reduce the treated oil yield and increase the gas and solid product yields. The presence of HDS mixture played a critical role in favoring the production of treated oil, reducing the formation of gas and solid products, and the removal of N, O, and S from the HBF. Under optimal reaction conditions, 96.3% of N, 87.1% of O, and 98.5% of S were removed from the initial feedstock. The treated oil mainly consisted of saturated hydrocarbon(∼40%, C8-C20) and aromatics(∼41%, naphthalene and benzene derivatives), which was had a comparable cetane number and better combustion characteristics relative to the market 0# diesel.
研究领域:
能源生物学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2024
·
IF 5.8
Jiajia Ma,Zhiheng Ye,Jie Zhou,Zhong-Ting Hu,Qianqian Wang,Junliang Wang,Zhiyan Pan,Mian Hu
In this study, the influences of soybean straw (SS) to spirulina platensis (SP) mass ratios and pyrolysis temperature on the evolution properties of N-containing species in pyrolytic tri-products and the nitrogen migration mechanism and involved chemical reactions during the co-pyrolysis processes were comprehensively investigated. Results indicated that co-pyrolysis of SS ang SP significantly facilitated the transformation of nitrogen into N bio-oil and N char from N gas . Increasing the amount of SP led to a decrease in the concentration of NH 3 and HCN in N gas , while their concentrations increased gradually with temperature increasing. NH 3 and HCN formation was due to H radicals attacking the N-sites of N-heterocyclic, with NH 3 formation being more strongly influenced by this process. Regarding N char , increasing the ratio of SP enhanced nitrogen incorporation reactions and promoted formation of pyridinic-N and pyrrolic-N. Conversely, decreasing the ratio of SP enhanced hydrogenation and condensation reactions, which favored the formation of quaternary-N. With increasing temperature, protein-N decomposed significantly, while pyridinic-N, pyrrolic-N, and quaternary-N remained stable. Additionally, pyridinic-N can convert to quaternary-N at temperature > 500 °C. Increasing the SP ratio greatly decreased oxygenates content while increased that of N-containing compounds in N bio-oil . The content of heterocycle-N (34.31 %) and nitriles (9.22 %) in bio-oil peaked at a ratio of 1:3, attributed to SP promoted the condensation and diazotization cyclization reactions. Furthermore, increasing the reaction temperature (from 400 to 800 °C) significantly increased the yields of heterocycles-N, while the yields of amines and amides decreased sharply due to dehydration reaction. As analyzed above, the possible nitrogen migration mechanism and involved chemical reactions were elucidated. These findings provides insights for generating high value-added N-containing chemicals and N-doped carbon materials during N-rich pyrolysis.
研究领域:
能源与环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Arabian Journal of Chemistry
·
2022
·
IF 6.212
Jingbo Wang,Yaxin Kang,Huatai Duan,Yi Zhou,Hao Li,Shanguo Chen,Fenghua Tian,Lianqing Li,Marios Drosos,Changxun Dong,Stephen Joseph,Genxing Pan
Co-pyrolysis of straw and Ca(OH) 2 is a feasible modification method to improve the adsorption capacity of biochar for Cd. However, few studies have quantitatively analyzed the contribution of different adsorption mechanisms of alkali-modified biochar. In this study, the alkali-modified (Ca) biochar were prepared by co-pyrolyzing lime (Ca(OH) 2 ) and soybean straw (SBB) or rape straw (RSB) at 450 °C. The adsorption mechanism was investigated by a series of experiments and was provided by quantitative analysis. The maximum adsorption capacities of Cd 2+ by Ca-SBB and Ca-RSB were calculated to be 78.49 mg g −1 and 49.96 mg g −1 , which were 1.56 and 1.48 times higher than SBB (50.40 mg g −1 ) and RSB (33.79 mg g −1 ), respectively. Compared with the original biochar (SBB, RSB), alkali-modified biochar (Ca-SBB and Ca-RSB) were found to have faster adsorption kinetics and lower desorption efficiencies. The mechanism study indicated that Ca(OH) 2 modification effectively enhanced the contribution of ion exchange and decreased the contribution of functional groups complexation. After Ca(OH) 2 modification, precipitation and ion exchange mechanisms dominated Cd 2 + absorption on Ca-SBB, accounting for 49.85% and 34.94% of the total adsorption, respectively. Similarily ion exchange and precipitation were the main adsorption mechanism on Ca-RSB, accounting however for 61.91% and 18.47% of total adsorption, respectively. These results suggested that alkali-modified biochar has great potential to adsorp cadmium in wastewater.
研究领域:
环境科学
·
土壤修复
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2022
·Vol. 45
·期 6
·3331-3344
·
IF 4.898
Li Xinyue,Jiang Yanyan,Chen Tianya,Zhao Pan,Niu Sen,Yuan Muzi,Ma Xiulan
The type of feedstock and pyrolysis temperature are the main reasons affecting the properties of the resulting biochar. Therefore, this paper investigates the effects of different feedstocks (peanut shell, corn straw and soybean straw) and different pyrolysis temperatures (300, 450 and 600 ℃) on the structural morphology and elemental composition of the resulting biochar. The optimum pyrolysis temperature of 600 ℃ was selected based on the comparison of the adsorption of NFX (norfloxacin) by the biochar prepared at different temperatures. Characterization of biochar materials using x-ray diffractometer, fourier transform infrared spectrometer and scanning electron microscope to study the changes in the physicochemical and structural properties of biochar. The results showed that the pH, surface area and ash content of biochar are increased with increasing temperature. The results of isothermal adsorption and adsorption kinetics experiments showed that the adsorption processes of the three biochar species on NFX were consistent with the Langmuir model and Pseudo-second order kinetic model. The adsorption process occurred in the surface layer of the biochar and was dominated by chemisorption. The inhibition of the adsorption of NFX was more obvious with the higher valence state of cations and the higher ion concentration. The adsorption mechanism of biochar on NFX includes pore filling, hydrogen bonding and electrostatic interactions.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2024
·
IF 9.7
Wenxuan Wu,Peiwen Zhu,Liping Luo,Hongyan Lin,Yuheng Tao,Lingyu Ruan,Liqun Wang,Qing Qing
Deep eutectic solvent (DES) is a newly-emerged green solvent for efficient pretreatment of lignocellulosic feedstock. To improve the component fractionation performance of neutral DES , p- toluenesulfonic acid ( p- TsOH) was employed as catalyst to form a novel ternary DES with benzyltriethylammonium chloride (TEBAC) and glycerol (Gly) for pretreatment of soybean straw. Under the optimum reaction conditions (TEBAC:Gly = 1:12, 1.6 wt% p- TsOH and reacted at 90 °C for 160 min), the lignin and hemicellulose removal from soybean straw were amounted to 92.0 % and 88.2 %, respectively. The pretreated substrate showed satisfactory enzymatic hydrolysis performance, as the glucose and reducing sugar concentrations reached 37.3 g/L and 42.3 g/L, respectively, after 72 h saccharification under the action of cellulase with a relatively low enzyme loading of 10 FPU/g cellulose. This method provides an efficient and mild route for utilization of agricultural waste and production of platform monosaccharides.
研究领域:
生物技术
·
可再生资源利用
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ANIMAL PHYSIOLOGY AND ANIMAL NUTRITION
·
2023
·
IF 2.7
Gongyan Liu,Haitao Sun,Ce Liu,Liya Bai,Liping Yang,Wenxue Jiang,Shuxia Gao
This study was conducted to investigate the effects of different dietary fibre sources on growth performance, gastrointestinal tract development, caecal fermentation and bacterial composition in the caecal contents of rabbits. A total of 120 35-day-old weaned Minxinan black rabbits were divided into three groups and fed a diet composed of peanut straw powder (Group A), alfalfa powder (Group B) and soybean straw powder (Group C) as the main fibre source. The final body weight and average daily gain in Group B were higher than those in Group C, and the average daily feed intake and feed conversion ratio in Group A were lower than those in Group C ( p < 0.05). The relative weights of the stomach, small intestine and caecum of rabbits in Group C were higher than those in Groups of B and A, and the relative weights of the caecal contents in Group C were lower than those in Groups A or B ( p < 0.05). The pH value and propionic acid, butyric acid and valeric acid concentrations in the caecum of Group C were lower than those in the caecum of Groups A or B, and the concentration of acetic acid in the caecum was lower ( p < 0.05). The dominant microbes in the caecal contents of Minxinan black rabbits were Firmicutes, Bacteroidetes and Proteobacteria at the phylum level, and the number of species, Chao1 index and ACE index measured was different between the B–C and A–C groups ( p < 0.05). Different dietary fibre sources could affect the growth performance, gastrointestinal tract development and intestinal microbiota of rabbits, and the nutritional value of alfalfa powder was better than that of peanut straw and soybean straw.
研究领域:
动物营养
·
微生物学
·
胃肠生理学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）