BIORESOURCE TECHNOLOGY
·
2014
·
IF 5.039
Yangyang Qian,Jie Zhang,Jie Wang
The pyrolysis of rice husk was conducted in a fixed-bed reactor with a sweeping nitrogen gas to investigate the effects of pressure on the pyrolytic behaviors. The release rates of main gases during the pyrolysis, the distributions of four products (char, bio-oil, water and gas), the elemental compositions of char, bio-oil and gas, and the typical compounds in bio-oil were determined. It was found that the elevation of pressure from 0.1 MPa to 5.0 MPa facilitated the dehydration and decarboxylation of bio-oil, and the bio-oils obtained under the elevated pressures had significantly less oxygen and higher calorific value than those obtained under atmospheric pressure. The former bio-oils embraced more acetic acid, phenols and guaiacols. The elevation of pressure increased the formation of CH 4 partially via the gas-phase reactions. An attempt is made in this study to clarify “the pure pressure effect” and “the combined effect with residence time”.
研究领域:
能源科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Materials
·
2022
·Vol. 15
·期 23
·8671
·
IF 3.748
Yuan Li,Xirong Lin,Zhanpeng Li,Jinyun Liu
A composite composing of TiO2nanoparticles load on biomass rice husk (RH) is developed by directly growing TiO2nanoparticles on RH. The in-situ growth of the nanocrystals on RH is achieved by a low-cost and one-step homogeneous precipitation. Rapid hydrolysis proceeds at 90 °C by using ammonium fluotitanate and urea to facilitate the selective growth of TiO2. The method provides an easy access to the TiO2-RH composite with a strong interaction between TiO2nanoparticles and the underlying RH. The structure and composition of TiO2-RH are characterized by using X-ray diffraction, X-ray photoelectron spectroscopy, Fourier-transform infrared spectroscopy, and UV-vis absorption spectroscopy. TiO2nanoparticles-RH exhibits a good photocatalytic degradation of methyl orange. The results show that 92% of methyl orange (20 mg L−1) can be degraded within three hours in visible light. The catalytic activity of the composite is not reduced after 6 cycles, and it still reaches 81% after 6 cycles. The enhanced performance is ascribed to the suitable particle size the good dispersibility. It is expected that the high photocatalytical performance and the cost-effective composite presented here will inspire the development of other high-performance photocatalysts.Keywords:TiO2;rice husk;photodegradation;methyl orange;ecological restoration
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biomass Conversion and Biorefinery
·
2022
·
IF 4.05
Hou Jingjie,Xia Juntao,Weng Ruoyi,Liu Yiting,Li Luyao,Liu Keyu,Sheng Jie,Song Yishan
Due to their significant differences in physicochemical properties, it is still challenging to remediate complex wastewater containing more than one kind of dyes via convenient adsorption. Herein, rice-husk-extracted mesoporous silicon (RH@MCM-41) was facilely synthesized, systematically characterized, and used as a versatile adsorbent to remediate methylene blue (MB) from simulated textile effluent. The influences of adsorption kinetics, isotherms, thermodynamics, pH, and mixed dyestuff toward MB remediation were studied. Results demonstrated that RH@MCM-41 possessed well MB sorption capacity in the single dyestuff solution with maximum sorption capacity of 213.31 mg/g at Sips model. Moreover, RH@MCM-41 could selectively sequestrate MB from rhodamine B (RB)/MB mixed systems. Interestingly, the sorption capacity of RH@MCM-41 to MB (methyl orange (MO)/MB, acid fuchsin (AF)/MB, and xylenol orange (XO)/MB) were significantly enhanced in mixed system while no obvious MO and AF as well as XO adsorption were detected in its individual system. It was elucidated that the uptake of other dyestuff and MB by RH@MCM-41 were due to the synergistic effects between multiple sorption mechanisms. Therefore, the source of green, simple preparation method, well sorption capacity, removal selectivity, and unique adsorption potential reveal RH@MCM-41 possessed tremendous potential for MB-containing wastewater sequestration in practical applications.
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
WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 3
·1-12
·
IF 2.9
Liu Caiying,Liu Yanyan,Feng Jiapeng,Li Yaru,Tao Jun,Xie Xiaoxiao
The paper aims to evaluate the effectiveness of biochar prepared from the co-pyrolysis of rice husk and cow bone (RHCBC) for in situ remediation and amelioration of Cd-contaminated soil. Effects of RHCBC on Cd bioavailability in soil and Cd uptake in corn growth were investigated through cultivation experiments and pot experiments. The results showed that the addition of RHCBC in the Cd-contaminated soil achieved the increase of soil pH, CEC, and SOM, whereas the soil available Cd content was reduced by 29.08–51.06%, which was proved by the transformation of Cd from acid soluble and exchangeable state to residual state. Furthermore, the nutrient contents of soil were also increased by 82.41–230.09% for alkali-hydrolyzable N, 66.81–144.03% for available P, and 16.20–77.70% for available K, respectively, which promoted the growth of corn. Overall, it is a promising strategy to employ RHCBC for in situ remediation of Cd-contaminated soil and promotion of plant growth as efficient soil amendment.
研究领域:
土壤科学
·
环境修复
·
农业科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 10
·期 5
·1431-1443
·
IF 5.726
Zhaohui Teng,Shan Huang,Liang Fu,Heng Xu,Na Li,Qulan Zhou
In our research, rice husk ash (RHA) was employed as a catalyst support and Fe–Cu bimetallic compounds were employed as catalysts in the reduction of NO by CO. Rice husk ash contains abundant amorphous SiO2 and it would be a good catalyst support as indicated by the characterization results. Different combustion conditions were tested to obtain the appropriate rice husk ash. Characterization methods were employed to study its physical properties. The results of the catalytic activity testing experiment were highly in accordance with the characterization results. Fe2Cu1 based on rice husk ash had approximately 100% conversion rates for both NO and CO, which indicated the superiority of the rice husk ash and Fe–Cu oxides. Moreover, the O2 content, CO/NO ratio and SO2 had little influence on this new combination. This remarkable performance was due to the strong interaction between the rice husk ash and metal species. The results of our research will provide some instructions for the improvement of industrial denitrification.
研究领域:
环境科学
·
催化化学
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Xin Zhong,Baihong Li,Chao Li,Lijun Zhang,Shu Zhang,Xun Hu
As an indispensable fraction of majority biomass, inorganics might not be inert in activation, due to their potential interaction with volatiles/activators and steric hindrance created for accessing organics in inner structure by activator. This was verified herein by conducting the activation of rice husk (RH), with inherent silica leached partially or completely by KOH, with ZnCl 2 or K 2 C 2 O 4 as an activator at 550 or 800 °C. The results indicated that removal of SiO 2 promoted condensation reactions with ZnCl 2 while cracking reactions with K 2 C 2 O 4 , forming more activated carbon (AC) with ZnCl 2 (41.1 %) but less AC-K 2 C 2 O 4 on organic basis (26.8 %). This resulted from enhanced permeability and more sufficient contact of the activator to organics via eliminating steric hindrance. After removing SiO 2 , the specific surface area increased from 1348.8 to 1712.3 m 2 /g −1 with ZnCl 2 as an activator, while that with K 2 C 2 O 4 increased from 615.4 to 1121.6 m 2 /g −1 . Moreover, the degree of aromatization in activation also increased after removing SiO 2 , forming rigid aromatic skeleton preserving micropores formed (97.6 % versus 86.0 % with AC-RH-K 2 C 2 O 4 ). The in-situ IR characterization of activation process confirmed negative impacts of SiO 2 on aromatization process from segregation of organics, which further deterred development of pores.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2025
·
IF 2.4
Vinh Thanh Chau Doan,Nhung Tuyet Thi Nguyen,Thinh An Tan Le,Phuong Hoang Tran
BACKGROUND Furfural is an important platform compound obtained through the dehydration of xylose, a key component of lignocellulosic biomass. Carbonaceous catalysts for this conversion have received rising interest due to low-cost price and easy modification. Rice husk is an abundant agricultural waste that could be employed as a carbon source for the preparation of many carbon materials, especially through green methods. RESULTS A carbonaceous catalyst (RH-SO₃H) derived from rice husk through microwave (MW)-assisted carbonization and sulfonation was employed as the catalyst for the conversion of xylose to furfural in dimethyl sulfoxide (DMSO). Fourier transform infrared (FT-IR) spectroscopy results indicated that RH-SO 3 H had typical signals of Brønsted acid groups while other characteristics were examined through other techniques, namely X-ray diffraction (XRD), energy-dispersive X-ray (EDX) spectroscopy, Raman spectroscopy, scanning electron microscopy (SEM), and elemental mapping. Through many investigations, the furfural yields were impacted by the nature of solvents, substrate concentrations, catalyst dosages, reaction temperatures, and reaction time. A furfural yield of 60.3% was obtained at 160 °C for 8 h. The catalyst recyclability and the scalability ability of the procedure were examined, and a mechanism was also proposed. CONCLUSION Rice husk could be used as a starting source to prepare a carbon material via a MW-irradiated protocol. The conversion of xylose to furfural under the catalysis of RH-SO 3 H was easily operated, and the desired product was obtained in good yield. The crucial advantages of the current process are environmentally friendly, inexpensive, simple, and highly large-scale application. The findings pave the way for eco-friendly industrial applications, promoting circular economy principles and reducing reliance on non-renewable resources in platform chemical production. © 2025 Society of Chemical Industry (SCI).
研究领域:
化学工程
·
可再生资源利用
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2021
·
IF 3.247
Yan-Qin Yang,Min-Hua Cui,Jian-Chao Guo,Jing-Jing Du,Zhi-Yong Zheng,He Liu
In this study, biochars were produced by co-pyrolysis of rice husk and sewage sludge, the environmental risk of heavy metal (Pd and Cd) in the biochars was assessed. Co-pyrolysis resulted in a lower yield but a higher C content compared with sewage sludge pyrolysis alone, the relative contents of Pb and Cd in biochars were declined. Co-pyrolysis process transformed the bioavailable heavy metals into stable speciation. The environmental risk assessment codes of Pb and Cd were reduced by 1–2 grades. The co-pyrolysis technology provides a feasible method for the safe disposal of heavy metal-contaminated sewage sludge.
研究领域:
环境科学
·
土壤学
✓ 已验证
DOI
PubMed
高影响因子
Gels
·
2025
·Vol. 11
·期 1
·74
·
IF 5.3
Yun Deng,Ziyan Sha,Xingxing Wang,Ke Duan,Weijie Xue,Ian Beadham,Xiaolan Xiao,Changbo Zhang
To expand the applications of hydrophobic silica aerogels derived from rice husk ash (HSA) through simple traditional methods (without adding special materials or processes), this paper employs machine learning to establish mathematical models to identify optimal conditions for extracting water glass and investigates how preparation conditions and heat treatment temperatures affect properties such as the porosity and hydrophobicity of HSA. The results indicate that the decision tree regression model provides the most accurate predictions for the extraction rate and modulus of water glass. Notably, the water contact angle of HSA produced using nitric acid as a catalyst can reach as high as 159.5°, classifying it as a superhydrophobic material. Additionally, while moderately increasing the concentration of the hydrophobic modifier enhances HSA’s hydrophobicity, it concurrently reduces its porosity. The HSA maintained hydrophobicity until 500 °C. The pore structure of HSA collapsed gradually with the increase in heat temperature. After treatment at 700 °C, HSA lost its hydrophobicity and the porous structure was severely damaged. Compared with silica aerogel using traditional silicon sources, the damage to pore structure and the crystallization occurred at lower temperatures, but the hydrophobicity remained at higher temperatures.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2018
·
IF 4.946
Chao Ding,Qiang Liu,Peng Li,Yongsheng Pei,Tingting Tao,Yan Wang,Wei Yan,Guofeng Yang,Xiaolong Shao
Utilization of phenolic compounds in rice husk and bran is important for improving the functionality of rice by-products. Eight rice varieties planted in different area were selected to analyze the phenolic compounds distribution of fractions in Japonica and Indica rice by using UPLC-MS method. A total of 12 phenolic compounds were identified in all rice varieties. Ferulic acid, gallic acid, protocatechuic acid and syringic acid were the dominant phenolic compounds in rice bran, while p-Hydroxybenzaldehyde was the main phenolic compounds existed in rice husk (14.46–23.72 µg·g −1 ). Bran and husk fractions provide more than 90% of phenolic compounds and antioxidant activity of whole rice. Regardless of the planting environmental effects, Japonica rice has significant higher phenolic compounds and antioxidant activity than Indica rice (P < 0.05). Therefore, it can be concluded that the distribution of phenolic compounds were strongly correlated with the rice varieties and fractions.
研究领域:
食品科学
·
植物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Yingchao Hu,Hongyuan Lu,Hailong Li
Li 4 SiO 4 stands out among various solid sorbents for CO 2 capture. The commonly used mechanical granulation process for Li 4 SiO 4 sorbents causes the destruction of the microstructures. Therefore, with the characteristics of huge production and low cost, an agricultural waste (rice husk) was employed as a pore former to improve the structures of Li 4 SiO 4 pellets and, thus, enhance the cyclic CO 2 sorption performance. The rice husk templating greatly enhanced the CO 2 sorption capacity of Li 4 SiO 4 pellets. Especially, 20 wt% rice husk-templated Li 4 SiO 4 exhibited the capacity of 0.21 g/g, which was nearly twice that of the unmodified sorbent. The quick release of the combustion gases from burning rice husk could create porosity for the sorbents. In addition, the alkaline compositions in rice husk promoted the CO 2 sorption due to the decreased CO 2 diffusion resistance by the formation of molten phases. Moreover, the ashes of rice husk after high-temperature combustion were found to block the pores of the sorbents, leading to the capacity reduction. The comprehensive function of rice husk templating for Li 4 SiO 4 pellets was the tradeoff between the positive effects of pore creation and alkaline doping and the negative effects of pore blockage by the ashes.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2016
·
IF 0
Xu Cheng,Yue Ming Li,Biao Wang,Jian Ming Jiang
In this paper, low-temperature preparation of rice husk char/TiO2 composite was developed by utilizing agriculture waste. nanosized TiO2 particles were successfully loaded to rice husk char by in-situ thermal treatment of impregnated rice husk. The structural characteristics and photocatalytic activities of obtained composites were investigated. The specific surface area of rice husk char was enlarged due to the catalytic effect of loaded TiO2 during thermal treatment. The porous rice husk char matrix combined with nanosized TiO2 particles offered large specific surface area and good photocatalytic property. This low-temperature preparation method provided a promising way to reuse the waste biomass and extended the applications of charcoal.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
危险品化学品经营许可证（带存储）