APPLIED CLAY SCIENCE
·
2016
·
IF 2.586
Zhujian Huang,Pingxiao Wu,Beini Gong,Xing Zhang,Zicong Liao,Pen-Chi Chiang,Xinjiang Hu,Lihua Cui
To further enhance the photocatalytic properties of doped-TiO 2 , a series of (N, Cu) co-doped TiO 2 /rectorite composites with different amount of N doping were prepared for adsorption and catalytic oxidation of p -chlorophenol ( p -CP) under visible light. The physicochemical properties of the obtained composites were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), etc. The results showed that the (N, Cu) co-doped TiO 2 catalyst was immobilized well onto rectorite , and the doping of N and Cu could affect the crystal structure of TiO 2 . The optimal N doping amount was determined by the photocatalytic degradation of p -CP in a stirred quartz reactor under visible light (> 420 nm) irradiation. It was found that the doping of N can improve significantly the degradation of p -CP and the optimum N doping amount is 1.0%. The adsorption of p -CP by the composites could accelerate the degradation rate of p -CP in situ. The photocatalytic activity of the (N, Cu) co-doped TiO 2 /rectorite composites remained stable after five cycles of photoreaction. A possible mechanism for the photocatalytic degradation of p -CP is proposed. Our work implied that rectorite has great potential to be applied in the field of photocatalysis .
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
CARBOHYDRATE POLYMERS
·
2013
·
IF 3.479
Wei Li,Xueyong Li,Qun Wang,Yijun Pan,Ting Wang,Hanqing Wang,Rong Song,Hongbing Deng
A mixture of positively charged lysozyme (LY) and rectorite (REC) composites was electrosprayed onto negatively charged electrospun cellulose acetate (CA) nanofibrous mats. The morphology and average diameter of CA mats and the mats coated with LY-REC were investigated by scanning electron microscopy. The composite mats were characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and energy-dispersive X-ray spectroscopy, and the results confirmed that LY and REC were successfully immobilized on the surface of CA mats via electrospraying technique. The small-angle X-ray diffraction results showed that the silicate layers of REC were completely exfoliated. The enzyme activity and bacterial inhibition analysis verified that the antimicrobial effect of the composite fibrous mats was enhanced with the addition of REC. The protein delivery properties and the bound enzyme activity after removal of unbound lysozyme from fibers were measured and showed that the electrospraying technique was suitable for enzyme immobilization.
研究领域:
材料科学
·
生物技术
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Lian Yi,Yubiao Li,Liangliang Zhu,Caiyan Gao,Xiaoyong Wu
Developing a low-cost and excellent catalyst for advanced oxidation process (AOPs) to degrade refractory organic contaminants is still an urgent problem. In this work, a copper oxide decorated natural rectorite (Cu-R) catalyst was successfully synthesized by a facile impregnation method. Intriguingly, Cu-R possessed excellent performance in removing tetracycline (TC) through photoinduced peroxymonosulfate (PMS) activation, and its reaction rate constants were ca. 4.3 times and 7.0 times that of Fe 2 O 3 and Co 3 O 4 , respectively. Moreover, the effects of reaction parameters on the photoinduced Cu-R activation of PMS to degrade TC were investigated in detail. The results showed that the system exhibited excellent impact resistance to Cl − , HCO 3 − and NO 3 − in aqueous solution. Cu-R could not only exhibit excellent removal of TC in a wide pH range of 5–9, but also maintain the stability of the catalyst. The electron paramagnetic resonance test and quenching experiments proved that the excellent TC removal ability could be mainly attributed to the synergistic effect between CuO and rectorite under the assistant of light, which was beneficial for the activation of PMS and then produced a large number of active radicals such as •OH and O 2 • - . Importantly, a possible path for TC degradation was given by the LC-MS analysis. The prepared Cu-R can provide a low-cost, high-efficiency and promising catalyst for the treatment of antibiotic wastewater by PMS activation with photoassistent.
研究领域:
环境科学
·
催化材料
·
废水处理
✓ 已验证
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 45
·期 2
·549-561
·
IF 1.674
Liu Wanghui,Yang Jianhong,Cai Jun
An environmentally benign CuO-rectorite was prepared by calcining the co-precipitation product of Cu 2+ with an acid-activated rectorite at pH 6. It could be well dispersed in water and used as a co-catalyst with TEMPO to selectively aerobically oxidize alcohols to aldehydes. The conversion of most primary benzylic alcohols was very high under optimized conditions. Interestingly, the oxidation protocol also allowed highly selective transformation of benzylic alcohols containing a phenolic hydroxyl group into the corresponding aldehydes. Additionally, very little copper was leached from the catalyst during the catalytic reaction. CuO-rectorite could be reused by centrifugation and washed with acetonitrile and water. At the same time, its catalytic activity remained high.
研究领域:
催化
·
有机化学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION
·
2013
·
IF 1.7
Ruifen Xu,Xuyang Feng,Wei Li,Shangjing Xin,Xiaoying Wang,Hongbing Deng,Lixian Xu
Core-shell structured beads were fabricated from chitosan (CS)/organic rectorite (OREC) composites and alginate (ALG) in Ca2+ aqueous solutions with different mixing ratios by a cross-linking process. The mechanical properties, surface and internal morphology, intercalation structure between CS and OREC, porosity and pore size distribution, bovine serum albumin (BSA) encapsulation efficiency and its controllable release ability were investigated. Optical microscopy, scanning electron microscopy and transmission electron microscopy showed that the core-shell structure was generated in the beads. The Fourier transform infrared spectra results implied the presence of electrostatic and hydrogen-bonding interaction between CS and OREC. The energy-dispersive X-ray and X-ray photoelectron spectroscopy results verified the existence of OREC in the beads. Small-angle X-ray diffraction results confirmed that the interlayer of OREC was intercalated by CS chains successfully, and the interlayer distance increased from 2.42 to 2.60 nm. The BSA encapsulation and release test indicated that the beads released the drug continuously. OREC could not only avoid the burst release phenomenon in the first period bust also improve the utilization efficacy of the drug. When the ratio of CS/OREC was 6:1 and CS-OREC/ALG was 2:1, the beads were better for drug released in stomach, and when CS/OREC was 12:1 and CS-OREC/ALG was 2:1, the beads were better for drug released in stomach than in intestine.
研究领域:
材料科学
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Yang Wu,Xiaodan Qiu,Shiyi Cao,Jiajia Chen,Xiaowen Shi,Yumin Du,Hongbing Deng
Natural polymer cellulose acetate (CA) and natural rectorite (REC) were employed to fabricate nanofibrous mats and then immobilized with biosorbent s accharomyces cerevisiae ( SCV ) to construct a sandwich-like structure. The hydroxyl and carbonyl groups in the CA endowed the nanofibrous mats with a strong affinity for removing heavy metals, allowing them to act as an adsorbent for heavy metals. The REC, which was blended with CA to fabricate the CA/REC nanofibrous mats, increased the specific surface area of the nanofibers and provided ideal scaffolds for the attachment of SCV , resulting in more contact reactions between the nanofibrous mats and heavy metal ions . The adsorption equilibrium was reached within 30 min at the optimum pH of 7, and the saturated adsorption capacities of Zn (II) and Cd (II) were 104.31 and 99.33 mg/g, respectively. The adsorption for Zn (II) and Cd (II) decreased to 47.44 and 62.11 mg/g in the co-system, but the total amount of adsorption (111.36 mg/g) was remarkably higher than that for the single system, indicating that the all-natural composite mats had great potential to simultaneously adsorb multiple heavy metals. After three cycles adsorption-desorption, the composite mats maintained a high adsorption efficiency.
研究领域:
环境科学
·
材料科学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·Vol. 14
·期 1
·120823
·
IF 7.2
Nan Dai,Chuan Jing,Dong Liu,Yuxin Zhang
A novel multidimensional mineral composite catalyst, FeOOH@Laponite@Diatomite (FeOOH@La@D), was synthesized by loading FeOOH onto Laponite@diatomite (La@D). The sea-urchin-like structure of FeOOH@La@D provides a large specific surface area and numerous active sites. It has a good adsorption performance for methylene blue (MB) and congo red (CR), with adsorption capacities of 630.3 mg/g and 257.1 mg/g, respectively. The synergistic effect of FeOOH and Laponite enhanced peroxymonosulfate (PMS) activation performance, achieving 99 % methyl orange (MO) removal within 20 min. Quenching experiments and EPR spectra indicate that SO 4 ●- and 1 O 2 are the dominant active species. Electrochemical and XPS results support electron transfer and Fe 2+ /Fe 3+ cycling. Combining response surface methodology with random forest models, pH value and dosage are identified as key factors. This work provides candidate materials and a theoretical basis for designing environmentally friendly non-homogeneous catalysts for wastewater treatment.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Qihang Zhao,Weiwei Yin,Chenhui Long,Zhiyi Jiang,Jinlong Jiang,Huaming Yang
The abuse of tetracycline has caused serious water pollution , so it is very important to explore the advanced removal technology of tetracycline from wastewater. Herein，a simple thermal treatment method leads to the modification of the surface and structure of rectorite to achieve the activation of rectorite (Rec 600 ) and successfully constructs multiple adsorption sites. The experimental results showed that Rec 600 exhibited good adsorption performance for tetracycline (143.25 mg·g −1 ), and the pseudo-second-order model and Freundlich model could better describe the kinetic and adsorption data. Rec 600 has a good adsorption ability in a wide pH range, and the removal rate of tetracycline decreased only 38.5% after 5 adsorption cycles. Rec 600 deploys good adsorption capacity , which can be attributed to the synergy of hydrogen bonding, electrostatic attraction and cation exchange. Rec 600 has the characteristics of high adsorption capacity , good reusability , low price and easy preparation, and has broad application prospects in the removal of tetracycline in polluted water.
研究领域:
环境科学
·
水处理技术
·
材料科学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Linbin Jiang,Yuan Lu,Xingyun Liu,Hu Tu,Jianwei Zhang,Xiaowen Shi,Hongbing Deng,Yumin Du
Quaternized carboxymethyl chitosan (QCM-chitosan) and organic rectorite (OREC) immobilized nanofibrous mats are fabricated via layer-by-layer (LBL) technique in a self-assembly manner. The negatively charged cellulose nanofibrous mats hydrolyzed from electrospun cellulose acetate (CEL) mats are alternately modified with the positively charged QCM-chitosan and OREC intercalated composites and the negatively charged sodium alginate (ALG) via LBL technique. The morphology and antibacterial activity of the resultant mats are studied by changing the number of deposition bilayers, the compositions of dipping solutions and outermost layer. X-ray photoelectron spectroscopy results imply that QCM-chitosan and OREC are coated on cellulose mats. Besides, wide angle X-ray diffraction and small angle X-ray diffraction are applied to investigate the crystalline of the composite mats and the interlayer distance of OREC, respectively. The antibacterial activity of the mats increases with the incorporation of OREC into LBL films.
研究领域:
材料科学
·
纳米技术
·
高分子科学
·
表面工程
·
生物医学工程
·
抗菌技术
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 28
·28860-28870
·
IF 2.914
Sun Zhiming,Yuan Fang,Zhang Xinchao,Zhu Rui,Shen Xinyi,Sun Bingyan,Wang Bin
Nowadays, most of mineral-based adsorbents are powder form, which makes them inconvenient to collect and always easy to cause secondary pollution. In this work, an organic rectorite composite nanofiber membrane (SRt-PAN) was designed and prepared by electrospinning technique. The as-received composite nanofiber membranes were characterized by XRD and SEM analysis, proving the homodisperse and existence of SRt in PAN nanofiber membrane. A series of batch experiments for BPA adsorption were carried out to investigate the effect of different adsorption parameters, including initial concentration, pH, and temperature of pollutant solution. The influences of modifier dosage and adsorbent dosage on the adsorption performance were investigated as well. On the basis of the experiment results, the adsorption process could be well described by the pseudo-second-order model and the Langmuir isotherm. In addition, the thermodynamic parameters indicate that this adsorption process is exothermic and spontaneous. Moreover, compared with pure nanofiber membranes and organic rectorite powders, the resultant SRt-PAN adsorbents exhibited higher adsorption capacity, superior reusability, and adsorption stability. It is indicated that the hydrophobicity surface of organic rectorite should be the key factor to not only the intimate interfacial combination between the mineral and PAN, but also the enhancement of BPA adsorption capacity.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Zhiming Sun,Jie Xu,Gaofeng Wang,Ankang Song,Chunquan Li,Shuilin Zheng
Mycotoxins contamination has been a worldwide long-standing issue, which poses tremendous threats to human health and food security. However, the detoxification of various mycotoxins, especially apolar species, is still a big challenge at present. In this study, carbon nanoparticles derived from biopolymer chitosan (Cts) and rectorite supported Cts carbon nanocomposite ( [email protected] ) were fabricated via hydrothermal treatment as efficient mycotoxin adsorbents for apolar zearalenone (ZER). Microstructural analysis revealed that Cts nanoparticles with smaller sizes uniformly distributed on the surface of rectorite, forming the [email protected] biocomposite . The obtained two adsorbents contained high organic carbon contents and large specific surface areas, which exhibited superior adsorption efficiency towards ZER. Kinetic study indicated that the adsorption of ZER on Cts and [email protected] reached equilibrium within 120 min, and the adsorption process fitted pseudo-second-order kinetic model better. The adsorption isotherms of ZER on both adsorbents matched obviously with linear model, which implied the existence of adsorption/partition model mechanism. The adsorption capacities were found to be positively correlated to the organic carbon contents and specific surface areas, suggesting that organic matter functioned as partition medium for ZER and the enhanced specific surface areas provided sorption sites for ZER. Furthermore, no desorption happened when changed the simulated pH based on the values from gastric fluid to intestinal fluid, confirming the feasibility of resultant Cts and [email protected] biocomposite as mycotoxins adsorbents in vivo.
研究领域:
材料科学
·
环境科学
·
食品科学
·
纳米技术
·
生物技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）