CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaolan Chen,Naiding Zhang,Chujun Ni,Ruijue Cao,Lanting Hu,Jinyi Chen,Qian Zhao,Tao Xie,Zhenjie Liu
Porous shape memory polymers (SMPs) can execute large volume expansion from their compressed temporary shapes to porous permanent shapes, which present promising practical potentials in biomedical and aerospace fields. While constructing sophisticated geometries are essential for achieving the corresponding functions of the foams, the original shapes which are typically determined by molds cannot be post-tuned in a customized fashion. Here we propose an easy but effective emulsion lyophilization method to fabricate porous SMPs, the original shapes of which can be post-regulated via a two-stage curing mechanism. A thermo-curable acrylate emulsion and a photo-curable polyurethane emulsion were prepared individually and then mixed in proportion. After lyophilization of the mixed emulsion, porous SMPs were prepared due to the first thermo-curing stage between epoxy and amine groups from the acrylate emulsion. The foams can be temporarily programmed into alternative shapes with relatively complex geometries which can afterwards be permanently fixed through the secondary photo-curing stage. In this way, simple permanent shapes of the porous SMPs determined by planar molds were converted into customized three-dimensional ones taking advantage of various deformation such as bending, imprinting, and twisting. Accordingly, customized biomedical devices were fabricated via the two-stage curing process, inspiring further application opportunities for porous SMPs.
研究领域:
材料科学
·
生物医学工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
Systems Microbiology and Biomanufacturing
·
2022
·Vol. 2
·期 4
·634-642
·
IF 0
Zhou Hengrui,Gao Song,Zeng Weizhu,Deng Zhenshan,Zhou Jingwen
Citrinin is a common mycotoxin produced by different fungi. Although considerable endeavors have been made to increase citrinin output to meet the requirements of research and industrial needs, few methods are effective, owing to potential safety concerns and technical limitations. In this study, a blue fungus that produces a yellow pigment was isolated from Ziziphus jujuba . The strain was then identified as Penicillium citrinum and named HR-087. Preparative liquid chromatography was used to extract the yellow pigment. Both LC–MS and NMR assays showed that it was citrinin. To enhance the citrinin production of this strain, the culture medium was optimized through orthogonal experiments, as well as batch and fed-batch process. The final titer and productivity of citrinin reached 9.62 g/L and 0.1 g/(L × h), respectively. The high titer achieved indicates the possibility of large-scale production of high purity citrinin for low-cost supply for both academic and diagnostic analysis standard.
研究领域:
微生物学
·
生物技术
·
天然产物化学
·
发酵工程
✓ 已验证
DOI
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Peng Liu,Yahao Zhao,Wen Liu,Furong Ye,Hui Lv,Zhuo Peng,Changcun Han,Xinguo Ma,Jiayi Tian,Difu Zhan,Qian Fu,Yizhong Huang
Solar photocatalytic hydrogen production shows promise in addressing global energy and environmental concerns. The limited efficiency of photocatalysts is mainly due to ineffective separation and transfer of photogenerated charges. To improve this, we enhance the TiO 2 –Ti 3 C 2 heterojunction by in-situ oxidation through interfacial engineering , resulting in a more compact composition . Subsequently, we anchor single-atom Pt at the TiO 2 –Ti 3 C 2 interface through photo-Ti 3 C 2 reduction. The in-situ growth of TiO 2 on Ti 3 C 2 introduces an interfacial driving force for carrier separation and provides a channel for electron transfer from TiO 2 to Ti 3 C 2 . This further facilitates transfer onto Pt, shortening the migration distance and enhancing the photocatalytic efficiency. The best Pt/TiO 2 –Ti 3 C 2 composite demonstrates an impressive hydrogen precipitation efficiency of 767 μmol g −1 h −1 , surpassing TiO 2 and Pt/TiO 2 by factors of 12 times and 1.46 times, respectively. Furthermore, we developed a higher efficiency photocatalyst using the molten salt method to avoid the risks associated with conventional hydrofluoric acid etching. This research opens up new possibilities for the preparation of MXenes interface-modified catalysts, offering a valuable avenue for future exploration in the field.
研究领域:
材料科学
·
能源与环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Mengcan Ju,Pinhua Rao,Lili Yan,Dungang Gu,Guanghui Li,Qincheng Chen,Shanliang Liu,Zhihong Zeng,Min Zhang,Wenjuan Zhang
Green preparation of high value-added products from biomass waste for environmental remediation has received significant attention. In this work, activated biochars were developed through two-step thermal process using tobacco stalk as the precursor. Textural properties of biochar can be effectively tuned by adjusting carbonization and activation parameters. An optimized biochar (700TS-1000–5), carbonized at 700 ℃ and then thermally activated at 1000 ℃ for 5 h, showed higher specific surface area (905.61 m 2 g −1 ), rich porous structure, and abundant surface functional groups. 700TS-1000–5 showed excellent performance with a removal capacity of 99.37 mg g −1 for sulfamethazine (SMT) in 720 min, which was 4.3 times that of pristine biochar (700TS). And the SMT removal was high-efficient under normal environmental pH range. Adsorption and degradation simultaneously occurred during the whole process, which mainly relied on defects, functional groups, and·OH radicals. Moreover, this typical sample showed outstanding recycling ability and effectiveness of column experiment. Compared with KOH-assisted chemical activation, thermal activation had minor environmental impact and lower preparation cost through environmental and economic assessment. These findings not only propose a simple protocol for high-value reuse of agricultural waste but also shed new light on applications of tobacco stalk-derived biochar.
研究领域:
环境科学
·
农业资源与环境
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2017
·
IF 3.743
Hongxing Chen,Zhongbao Guo,Yu Zhou,Dan Li,Lei Mu,Paul L. Klerks,Yongju Luo,Lingtian Xie
We previously demonstrated that chronic exposure to hexavalent chromium (Cr(VI)) causes a variety of adverse effects in the Japanese medaka ( Oryzias latipes ). The present study investigated the transition of acute to chronic effects by assessing the influences of Cr(VI) exposure concentration and exposure duration on Cr accumulation and their effects on fish growth and antioxidant physiology. Juvenile fish were exposed to 0.05, 0.5, 4 or 8 mg/L Cr(VI) for 28 days. Endpoints were evaluated on days 3, 7, 14, 21 and 28. In addition, Cr depuration was examined for fish from two exposure groups (0.5 and 8 mg/L). Chromium accumulation was rapid initially, then continued at a slower rate till the end of the exposure period without showing signs of reaching a steady state. Depuration patterns differed between the two exposure groups, but both reached 50% in 14 days. The rapid initial accumulation was accompanied by increased lipid peroxidation and elevated activities of antioxidants (e.g., GST , SOD and CAT). Activities of these enzymes had mostly returned to baseline levels by day 7, but there was no evidence of further cellular damage from ROS. Effects on fish length and weight continued to be evident over the 28-day exposure period. Our study suggest that the initial effects of Cr(VI) exposure may not be a good predictor of more-chronic effects in fish as a consequence of an efficient acclimation response by the antioxidant system that limits ROS-mediated toxicity.
研究领域:
环境毒理学
·
鱼类生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2020
·
IF 7.539
Sen Lin,Weiwei Huang,Hongjun Yang,Shuying Sun,Jianguo Yu
An oxidized biochar was prepared using long-root Eichhornia crassipes through an aerobic/anaerobic hybrid calcination to recycle its waste plants after eutrophic treatments. The adsorption performances of the biochar were investigated and the results showed that the adsorption equilibrium could arrive in 30 min and the adsorption capacities for Pb 2+ , Cu 2+ , Cd 2+ and Zn 2+ at 30 °C were 0.57, 0.41, 0.44 and 0.48 mmol/g, respectively. The adsorption could be promoted at higher pH and temperature and the adsorption tolerance for different heavy metal ions to the existence of competing ions and organic matters was hierarchical. The adsorption was deduced to be heterozygous courses and mainly controlled by complexation of oxygen-containing groups with these heavy metal ions. It was confirmed that the biochar could be regenerated with HCl solution and the adsorption performance kept consistent in 10 adsorption–desorption cycles.
研究领域:
环境科学
·
植物学
✓ 已验证
DOI
PubMed
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 9
·805
·
IF 4.4
Deyue Xiao,Peng He,Haolong Zheng,Shujing Yang,Siwei Yang,Guqiao Ding
Graphene has achieved mass production via various preparative routes and demonstrated its uniqueness in many application fields for its intrinsically high electron mobility and thermal conductivity. However, graphene faces limitations in assembling macroscopic structures because of its hydrophobic property. Therefore, balancing high crystal quality and good aqueous dispersibility is of great importance in practical applications. Herein, we propose a tape-wrapping strategy to electrochemically fabricate water-dispersible graphene (w-Gr) with both excellent dispersibility (~4.5 mg/mL, stable over 2 months), and well-preserved crystalline structure. A large production rate (4.5 mg/min, six times faster than previous electrochemical methods), high yield (65.4% ≤5 atomic layers) and good processability are demonstrated. A mechanism investigation indicates that the rational design of anode configuration to ensure proper oxidation, deep exfoliation and unobstructed mass transfer is responsible for the high efficiency of this strategy. This simple yet efficient electrochemical method is expected to promote the scalable preparation and applications of graphene.
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
Nanomaterials
·
2022
·Vol. 12
·期 6
·1018
·
IF 5.719
Jianming Yu,Lijie Yang,Jing Jiang,Xunyi Dong,Zhiyang Cui,Chao Wang,Zhenda Lu
Silver nanowires (Ag NWs) have shown great potential in next-generation flexible displays, due to their superior electronic, optical, and mechanical properties. However, as with most nanomaterials, a limited production capacity and poor reproduction quality, based on the batch reaction, largely hinder their application. Here, we applied continuous-flow synthesis for the scalable and high-quality production of Ag NWs, and built a pilot-scale line for kilogram-level per day production. In addition, we found that trace quantities of water could generate sufficient vapor as a spacer under high temperature to efficiently prevent the back-flow or mixed-flow of the reaction solution. With an optimized synthetic formula, a mass production of pure Ag NWs of 36.5 g/h was achieved by a multiple-channel, continuous-flow reactor.Keywords:continuous-flow synthesis;silver nanowires;flow chemistry;pilot-scale synthesis
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
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2023
·
IF 7.8
Hong Guo,Yaohua Liu,Yuancai Lv,Yifan Liu,Yunzhi Lin,Minghua Liu
A new nitrogen doped sinocalamus oldhami lignin-based activated biochar (denoted as N-BGAC) with a notably high adsorption efficiency was prepared for the removal of malachite green (MG). The properties and structure of N-BGAC were thoroughly characterized, alongside an investigation into the MG adsorption process . The findings revealed that N-BGAC possessed a substantial specific surface area of 2238 m 2 g −1 , nearly double that of the activated biochar lacking nitrogen doping (BGAC). Additionally, N-BGAC exhibited exceptional adsorption efficiency for MG, boasting a maximum adsorption capacity of 1372.5 mg g −1 , marking an enhancement of nearly 2.5 times compared to BGAC. By exploring the adsorption mechanism, it could be found that the adsorption process was a spontaneous exothermic reaction , and mainly controlled by pore-filling effect, electrostatic interactions, hydrogen bonding, hydrophobic interactions and π-π bonding interactions. Crucially, in the regeneration experiments, the removal percentage of MG could still reach 81.5% after four cycles of regeneration, making it promising in the contaminant removal .
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
·
2022
·Vol. 14
·期 17
·2595
·
IF 3.53
Wenjie Xu,Minghan Luo,Xinyue Lu,Zhengfang Ye,Taeseop Jeong
The removal of nitrate (NO3−-N) and antibiotics in aquaculture tail water is urgent and necessary. A lab-scale up-flow immobilized biofilter (I-BF) filled with polyurethane foam (PUF) carriers and a microbial consortium was developed for simultaneous removal of nitrate and tetracycline (TC). The denitrification and TC removal performance of the I-BF reactor was investigated under different TC concentrations (0, 10, 50, 100 mg·L−1), carbon/nitrogen (C/N) ratio (2, 4, 5, 6) and hydraulic retention times (HRT) (4, 8, 12 h). Simultaneous removal of nitrogen and TC was achieved by the I-BF reactor. Low TC concentration (≤50 mg·L−1) had little effect on nitrogen removal. The denitrification performance of the I-BF reactor was inhibited at high TC load, which may be attributed to the damage of cell membranes and the inhibition of the intracellular denitrification enzymes’ activities. The optimal C/N ratio and HRT were 5 h and 8 h with almost complete denitrification and high TC removal efficiency (73.46%) at influent NO3−-N and TC concentrations of 100 mg·L−1and 50 mg·L−1, respectively. The I-BF reactor proposed in this study has promising applications such as the treatment of piggery wastewater, aquaculture tail water and pharmaceutical wastewater co-contaminated with nitrate and antibiotics.Keywords:denitrification;tetracycline;immobilized biofilter reactor
研究领域:
环境工程
·
水处理
·
微生物学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Jin Yu,Xu Zhang,Hai Wang,Longcheng Liu,Yushan Zhou,Chengtao Yue
Water hyacinth is recognized as one of the top ten invasive weeds that pose significant environmental hazards globally. The resourceful utilization of water hyacinth offers substantial ecological benefits. In this work, water hyacinth is employed to synthesize a phosphorylated biochar for the efficient decontamination of uranium-containing radioactive wastewater, thereby achieving dual environmental benefits. The biochar with a large specific surface area of 1328 m 2 /g and a large pore volume of 0.94 cm 3 /g is obtained via carbonization of a freeze-dried water hyacinth-phytic acid composite. It possesses a high density of uranophilic phosphoric acid groups, with the surface phosphorus content reaching 0.78 at%. As anticipated, phosphorylated biochar demonstrates superior adsorption performance for uranium (VI) ions. The removal efficiency achieves 99 % in a uranium solution with an initial concentration of 100 mg/L at a dosage of 1.0 g/L within 30 minutes, while the maximum adsorption capacity reaches 478 mg/g. It is proficient in removing uranium across a pH range of 2.2–6.6 and exhibits tolerance under high ionic strength conditions. The distribution coefficient for uranium attains 28.5 L/g, which is significantly higher than that of many other metal ions. Moreover, the biochar is readily regenerated by elution with diluted HNO₃ and reused up to five times without any loss of efficiency. Delightfully, phosphorylated biochar effectively reduces the uranium concentration in actual nuclear wastewater from 16 μg/L to below 4 μg/L. The effective adsorptive decontamination of radioactive wastewater, followed by the incineration of spent biochar, significantly reduces the volume of radioactive waste.
研究领域:
环境科学
·
材料科学
·
生态学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 30
·2309780
·
IF 13
Yumeng Ge,Le Wang,Zewen Su,Md. Nahian Al Subri Ivan,Congcong Wang,Keyu Han,Yuen Hong Tsang,Shiqing Xu,Gongxun Bai
The conventional sea water desalination technologies are not yet adopted worldwide, especially in the third world countries due to their high capital cost as well as large energy requirement. To solve this issue in a sustainable way an interfacial solar water evaporation device is designed and proposed in this article using the branches of Prunus serrulata (PB). The PB has abundant microchannels and shows excellent photothermal conversion capability after carbonization. Moreover, the easy access to raw materials and the facile fabrication process makes the solar water evaporating device very cost effective for seawater desalination application. Experiments show that in the presence of the fabricated evaporator the evaporation rate of water can reach 3.5 kg m −2 h −1 under 1 sun, which is superior to many similar experimental devices. In addition, its advantages, such as effective sewage purification capability, low cost, and environmental friendliness, make this evaporator highly competitive in the extensive promotion of this technology and can be considered as a new sustainable solution for seawater desalination with great application potential and prospects.
研究领域:
材料科学
·
环境科学
·
可持续能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）