SEPARATION AND PURIFICATION TECHNOLOGY
·
2016
·
IF 3.299
Peng Huang,Qing Zhang,Hongye Pan,Lianjun Luan,Xuesong Liu,Yongjiang Wu
In the present study, integrated extraction-adsorption process was developed and applied to extract and purify total flavonoids from Scutellariae barbatae herba. Screening of macroporous resins, single factor experiments, an experimental design based on Box-Behnken design (BBD) and purification conditions study were carried out to optimize the integrated process. DM130 resin was chosen as adsorbent and the optimal extraction-adsorption conditions were determined as pH of extraction solvent 2, time 9 h, liquid/solid ratio 20:1 mL/g and flow rate 7 BV/h. 70% (5 BV) ethanol aqueous solution was selected as elution solvent. Through this procedure, the total flavonoids of Scutellariae barbatae herba can be totally extracted using water as extraction solvent rather than high concentration ethanol was used in traditional extraction method. Moreover, the integrated process can simplify operation, reduce energy consumption, and prevent the degradation of bioactive substances, thus improve the quality of products. Compared to the conventional method, the recovery yield and purity of total flavonoids obtained from this procedure increased by 1.50 and 1.16 times respectively. The results showed that the integrated procedure can be efficient and eco-friendly, as well as appropriate for large-scale extraction and purification of total flavonoids from Scutellariae barbatae herba .
研究领域:
中药学
·
天然产物化学
✓ 已验证
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2015
·
IF 4.494
Yaqin Zhang,Ming Li,Yafei Wang,Xiaosheng Ji,Lin Zhang,Lian Hou
Low sugar concentration and the presence of various inhibitors are the major challenges associated with lignocellulosic hydrolyzates as a fermentation broth. Vacuum membrane distillation (VMD) process can be used to concentrate sugars and remove inhibitors (furans) efficiently, but it’s not desirable for the removal of less volatile inhibitors such as acetic acid. In this study, a VMD-adsorption process was proposed to improve the removal of acetic acid, achieving simultaneous concentration and detoxification of lignocellulosic hydrolyzates by one step process. Results showed that sugars were concentrated with high rejections (>98%) and little sugar loss (<2%), with the significant reduction in nearly total furans (99.7%) and acetic acid (83.5%) under optimal operation conditions. Fermentation results showed the ethanol production of hydrolyzates concentrated and detoxified using the VMD-adsorption method were approximately 10-fold greater than from untreated hydrolyzates.
研究领域:
生物工程
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Jing Wang,Ru-yi Zhou,Jun-xia Yu,Hui-sheng Wang,Qiu-yan Guo,Ke-qi Liu,Hao-dong Chen,Ru-An Chi
Hydrometallurgy leaching is a common method used to recycle heavy metals from electroplating sludge , but the subsequent separation of heavy metals from the complex leaching solution is difficult. In this study, Cu(II), Zn(II), and Cr(III) were sequentially recycled from electroplating sludge by an on-line biosorption method with dosage controlling. The results showed that the three metals mainly existed in their labile forms and could be leached by HNO 3 . A series of amine-modified bagasse biosorbents were prepared, and diethylenetriamine-modified sorbent was chosen and fixed in a column to remove heavy metals from the leaching solution. Sorbent dosage experiments showed Cu(II) was recycled exclusively at a dosage of 1.5 g/L, while Zn(II) and Cr(III) were recycled simultaneously at a dosage of 3.8 g/L when treating 800 mL of a leaching agent containing 13.4, 9.9, and 7.1 mg/L of Cu, Zn, and Cr. A linear relationship between the dosage and amount of adsorbed metal ions was obtained. The XPS results illustrated that the column had an adsorption affinity order of Cu(II)>Zn(II), Cr(III)≫Ca(II), Mg(II). Cu(II) was enriched in the foot layer, and Zn(II) and Cr(III) were enriched in the middle layer of the column, while co-ions could not be absorbed. According to these results, Cu(II), Zn(II), and Cr(III) could be sequentially recycled by using these columns in-series.
研究领域:
环境科学
·
冶金工程
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2021
·
IF 11.236
Gang Wang,Ganggang Li,Xin Xing,Zhongshen Zhang,Zhengping Hao
Utilization of biogas from wastewater treatment plants (WWTPs) as a kind of renewable energy can effectively alleviate the escalating energy crisis. However, volatile methylsiloxanes (VMS) exist in biogas as impurities and hinder its efficient use. Adsorption is the main technology to achieve high-efficiency purification of VMS currently, yet studies on the adsorption processes and mechanisms are quite insufficient. Here, we use the static vapor adsorption method to investigate the adsorption performances and mechanisms of four typical zeolite adsorbents (Hbeta, SBA-15, MOR and MCM-41) towards hexamethyldisiloxane (L2), which is a representative of VMS. Results suggest the adsorption interaction of L2 and zeolite is closely related to the pore size of zeolite and follows the order of Hbeta > MCM-41 > SBA-15 > MOR. The adsorption rate constants of L2 on MCM-41 are larger than the others in the most relative pressure ranges. Besides, cyclic adsorption/desorption performances of L2 on MCM-41, SBA-15 and Hbeta show their super recycling properties. These studies would provide important information on designing an effective zeolite-L2 adsorption system, and are helpful to understand the deeper adsorption mechanisms of VMS on zeolites.
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
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Tingting Huang,Qingyi Peng,Wenjin Shi,Jundong Xu,Yu Fan
This article proposes a novel sodium dodecylbenzenesulfonate (SDBS)-assisted equilibrium adsorption method for preparing highly dispersed Ni/Al 2 O 3 and Fe-promoted NiFe/Al 2 O 3 thioetherification catalysts. The proposed strategy anchors nickel cations onto the electronegative surface of an Al 2 O 3 support modified by negatively charged DBS − bilayers. As a result, this method achieves highly dispersed Ni nanoparticles without strengthening the metal-support interaction, promoting the reducibility and sulfurization of the supported Ni species. The as-prepared Ni-based catalysts have a smaller size, a higher dispersion of metal nanoparticles, and a greater amount of active metal sulfides than their counterparts prepared by the conventional impregnation method, endowing them with excellent catalytic performance for the highly selective removal of mercaptans. This method provides a new opportunity to prepare highly dispersed metal nanoparticles without a strong metal-support interaction.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Water
·
2024
·Vol. 16
·期 11
·1474
·
IF 3
Xiujuan Feng,Du Cen,Yonghui Wu
The process of mining produces a large amount of heavy metals and high-sulfate mine water, which is the main factor leading to environmental degradation in the mining area, and the removal of heavy metals and the recovery of sulfate from mine water is a difficult problem faced by mines today. Currently, sulfate is treated as a hazardous substance and is not recycled. In this paper, the precipitation–adsorption bipolar membrane electrodialysis (BMED) multi-technology-coupled recovery of sulfate method was used to treat mine water. The results showed that the coupling technology could remove heavy metals and sulfate in water better, while the sulfate desalination rate was about 96.8%, current efficiency was 54.2%, energy consumption was 0.823 kWh/kg, and the acid production concentration was 0.168 at an electrolyte concentration of 0.1 mol/L, an operating voltage of 12 V, an initial salt concentration of 30 g/L, and a flow rate of 3.5 mL/min. Mechanistic results showed that the precipitation–adsorption method could realize the removal of heavy metals from mine water. The BMED process realized the removal of sulfate and also the recovery of acid. The multi-technology coupling of precipitation–adsorption and bipolar membrane electrodialysis explored in this paper provides a direction for the in-depth treatment of mine water.
研究领域:
环境科学
·
化学工程
·
矿业工程
✓ 已验证
DOI
高影响因子
Frontiers of Materials Science
·
2024
·Vol. 18
·期 4
·1-11
·
IF 2.5
Yue Li-ping,Kong Fan-xin,Chen Jin-fu,Zhou Ai-guo,Sun Guang-dong
Ionized amine group (R-NH 2 ) and carboxyl group (R-COOH) within the active layer of polyamide (PA) nanofiltration membranes result in the formation of positive (R-NH
+ 3
) and negative (R-COO − ) functional groups, respectively, which determines membrane performance and is essential for membrane fabrication and modification. Herein, a facile dye adsorption/desorption method using Orange II and Toluidine Blue O dyes was developed to measure the densities of R-NH 2 , R-NH
+ 3
, R-COOH, or R-COO − on surfaces of six PA membranes, and the correlation between the density of such groups and the zeta potential was established. The dye adsorption method was proven reliable due to its lower standard deviation, detection limit, and quantification limit values. Furthermore, the densities of R-NH
+ 3
or R-COO − under different pH values were measured, fitting well with results calculated from the acid-base equilibrium theory. Additionally, a correlation was established between the net surface density ([R-NH
+ 3
] − [R-COO − ]) and the surface charge density ( σ ) calculated via the Gouy–Chapman model based on zeta potential results. The resulted correlation ( σ /(mC·m −2 ) = (3.67 ± 0.08) × ([R-NH
+ 3
] − [R-COO − ])/(nmol·cm −2 ) + (0.295 ± 0.08)) effectively predicts the σ value of the membrane. This study provides a facile and reliable dye adsorption method for measuring the density of R-NH 2 , R-NH
+ 3
, R-COOH, or R-COO − , enabling an in-depth understanding of membrane charge properties.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2018
·
IF 5.018
Yanfeng Chen,Qi Zhang,Xiaoyan Wen,Huibin Yin,Jian Liu
Phase change material is one of the most promising materials in thermal energy storage systems . In this work, a new phase change composite of Stearic Acid@Multi-walled carbon nanotubes (SA@MWCNTs) is prepared by a simple vacuum absorption method. The as-prepared composite is determined by scanning electronic microscope (SEM), Fourier transformation infrared spectroscope (FT-IR) and X-ray diffractometer (XRD). The results show that outside diameters of the PCM composite are about 50–60 nm and Stearic Acid is encapsulated in the MWCNTs without chemical reaction. The DSC results indicate that the melting temperature and latent heat of the composite are 59.28 °C and 91.94 J g −1 , respectively. The encapsulation ratio of Stearic Acid is calculated to be 47% from the results of the DSC measurements. The as-prepared SA@MWCNTs composite was dispersed into the water to form stable suspension, and the suspension shows remarkable photo-thermal conversion performance with temperature increases from 30 to 80 °C. The receiver efficiency of this new kind of heat transfer fluid maintain 85% in wide temperature range. Furthermore, the PCM composite could maintain its phase transition perfectly after 50 melting–freezing cycles, and no leakage of paraffin was observed by SEM. The high heat storage capability and excellent photo-thermal conversion performance of the composite enable it to be a potential material to store solar energy in practical applications.
研究领域:
材料科学
·
热力学
·
纳米科技
·
能源存储
·
光热转换
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2018
·Vol. 19
·期 5
·1424
·
IF 3.687
Miaad Adnan,Kai Li,Jianhua Wang,Li Xu,Yunjun Yan
A hierarchical mesoporous zeolitic imidazolate framework (ZIF-8) was processed based on cetyltrimethylammonium bromide (CTAB) as a morphological regulating agent and amino acid (l-histidine) as assisting template agent.Burkholderia cepacialipase (BCL) was successfully immobilized by ZIF-8 as the carrier via an adsorption method (BCL-ZIF-8). The immobilized lipase (BCL) showed utmost activity recovery up to 1279%, a 12-fold boost in its free counterpart. BCL-ZIF-8 was used as a biocatalyst in the transesterification reaction for the production of biodiesel with 93.4% yield. There was no significant lowering of conversion yield relative to original activity for BCL-ZIF-8 when continuously reused for eight cycles. This work provides a new outlook for biotechnological importance by immobilizing lipase on the hybrid catalyst (ZIF-8) and opens the door for its uses in the industrial field.Keywords:adsorption method;biodiesel production;Burkholderia cepacialipase (BCL);hexahedral ZIF-8;hierarchical ZIF-8;surfactant
研究领域:
生物技术
·
催化化学
·
可再生能源
✓ 已验证
DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Xiaopo Niu,Rong Zhao,Yunxi Han,Xiangwen Zhang,Qingfa Wang
Deep hydrogenation of polycyclic aromatic hydrocarbons is a feasible strategy to acquire high-performance aviation fuels, in which the key is to design highly active hydrogenation catalysts. Herein, hollow ZSM-5 (HZ) and silicalite-1 (HS) zeolites with hierarchical porous architectures were manufactured through a post-alkali treatment strategy, and further supported Pt to fabricate Pt/HZ-WI, Pt/HZ-SEA and Pt/HS-SEA catalysts employing wet impregnation (WI) and strong electrostatic adsorption (SEA) methods. The SEA catalysts presented higher metal dispersion, more election-deficient Pt δ+ species and stronger spillover hydrogen ability, thus resulting in better intrinsic hydrogenation properties in the deep hydrogenation reaction of phenanthrene than the WI ones. Moreover, Pt/HZ-SEA catalyst showed the supreme catalytic activity and the lowest activation energy of 52.11 kJ·mol −1 due to more hydrogenation active sites generated by the highly dispersed Pt clusters and the accelerated diffusion of reactants via the hierarchical porous architectures. Almost 100% selectivity to the deep hydrogenation products was achieved at rather low temperature of 220 °C. The Pt/HZ-SEA also displayed outstanding activity for hydrogenation of naphthalene, acenaphthylene and fluorene and excellent sulfur resistance. Furthermore, the acidic sites in HZ zeolite were favorable to boost the formation of electron-deficient Pt δ+ species having stronger deep hydrogenation ability and intensify the additional hydrogenation route through the spillover hydrogen. Finally, the DFT calculation results further verified that the Pt δ+ substances could heighten the adsorption of polyaromatics, thereby improving the deep hydrogenation activity.
研究领域:
催化化学
·
能源化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Dandan Yu,Hua Wang,Jie Yang,Zhiqiang Niu,Huiting Lu,Yun Yang,Liwei Cheng,Lin Guo
Currently, the energy crisis and environmental pollution are two critical challenges confronted by humans. The development of smart strategies to address the above-mentioned issues simultaneously is significant. As the main accomplices for water pollution, several kinds of organic dyes with intrinsic redox functional groups such as phenothiazines derivatives, anthraquinone, and indigoid dyes are potential candidates for the replacement of the conventional pseudocapacitive materials. In this work, three typical organic dyes can be efficiently removed by a facile adsorption procedure using reduced graphene oxide coated cellulose fiber (rGO@CF) paper. Flexible supercapacitors based on dye/rGO@CF electrodes exhibit excellent electrochemical performances that are superior to or comparable with those of conventional pseudocapacitive materials based devices, presenting a new type of promising electrode materials. Moreover, benefiting from the high flexibility and considerable mechanical strength of the graphene composite paper, the operating potential and capacitance of the devices can be easily adjusted by tailoring the hybrid electrodes into different specific shapes followed by rational integrating. The smart design of these dye/rGO@CF paper based electrodes shows that energy storage and environmental remediation can be achieved simultaneously.
研究领域:
环境科学
·
材料科学
·
能源化学
·
纳米技术
·
电化学
·
可持续发展
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
·
IF 4.6
Yafang Pan,Xiaolong Song,Shi Wang,Shuguang Li,Mingli Wang
Combining the advantages of semiconductors and precious metals to produce highly sensitive Surface-enhanced Raman scattering (SERS) substrates. In this paper, Cu 2 O@Ag core-shell particles were prepared, optical fibers were selected as substrates to strengthen the portability of SERS substrates, optical fiber SERS probes were prepared by electrostatic adsorption method and chemical bonding method, and the performance of SERS probes prepared by the two methods under the same deposition time was discussed, which it was found that the optical fiber probes prepared by chemical bonding method had better Raman enhancement effect. Rhodamine 6G(R6G) was used as the detection molecule to investigate the detection limit, uniformity, reproducibility of fiber SERS probe. 4-nitrophenyl thiophenol (4-NTP) is an organic molecule used in the synthesis of pesticides and dyes, excessive use can be harmful, it was found that the detection concentration of 4-NTP is as low as 10 −6 M, and the detection limit of the optical fiber SERS probe is used to detect thiram in pears, which its detection limit is 0.5 mg/L, which is far lower than the national standard of the United States and China (5 mg/L). The above experimental results show that an excellent fiber optic SERS probe has been successfully developed.
研究领域:
分析化学
·
生物传感器
·
纳米材料学
·
光子学
·
食品安全检测
·
分子诊断
✓ 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）