INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2013
·Vol. 38
·期 25
·10191-10195
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IF 3.548
Zhuobin Yu,Qiang Zhao,Genyan Hao,Wen Yuan,Jinping Li
A weakly acidic H 3 BO 3 solution (pH = 5.1) was used to synthesize new oxygen-evolution catalysts for water splitting under mild conditions. Two novel oxygen-evolution catalysts, Co–BA i and Mn–BA i (BA i = inorganic boric acid), were obtained in the H 3 BO 3 solution with added Co 2+ and Mn 2+ , respectively. The average oxygen evolution rate in the H 3 BO 3 solution with Co 2+ was 0.3133 μmol/h, about 70 times greater than the rate without a metal ion ; the rate with Mn 2+ was 1.13 μmol/h, about 250 times greater. The phases, morphologies, and compositions of the Co–BA i and Mn–BA i catalysts were analysed by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy .
研究领域:
材料化学
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电催化
·
能源科学
·
无机化学
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可持续能源技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2024
·Vol. 14
·期 47
·34746-34755
·
IF 3.9
Xiaoxia Luo,Xianliang Ren,Hongwei Wang
This work focuses on the application potential of novel MXene materials in the field of uranium-containing wastewater adsorption, particularly addressing gaps in existing research. Ultra-thin layered TiVCTx was selected as the core adsorbent to thoroughly investigate its adsorption performance of uranium(U(VI))-containing wastewater. By compounding with sodium alginate, we successfully prepared easily recoverable aerogel beads and evaluated their adsorption capacity for ultra-low concentrations of U(VI) in seawater. The findings of this study reveal that TiVCTx exhibits optimal adsorption capacity for U(VI) in a weakly acidic environment with a pH of 5.59, and its maximum adsorption capacity for U(VI) reaches up to 336 mg g−1, demonstrating superior performance when it comes to other MXene materials. Further research reveals that the adsorption mechanism involves the synergistic effect of electrostatic adsorption and reduction adsorption, exhibiting monolayer adsorption characteristics, and the adsorption process is a spontaneous endothermic reaction. Notably, in simulated complex seawater environments, even when the U(VI) concentration is as low as, for instance, 3.3 μg L−1, 50 mg of aerogel beads can still achieve an adsorption capacity of 3.89 mg g−1 for 60 L of seawater. These findings underscore the outstanding performance of TiVCTx as a novel MXene material in U(VI) adsorption and its broad potential for practical applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
POLYMER
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2022
·
IF 4.432
Xue Liao,Zhenyu Xiang,Ying Lei,Zijun Zhu,Junling Guo,Shaojian Lin,Jiaojiao Shang
The drug release system is emerging as a novel dosage form for multipurpose prevention against the undesired cytotoxic side effect caused by large doses of oral administration via the site-specific and on-demand control of drugs. Herein, a drug release system with a large dose of encapsulation-free drugs loading and site-specific controlled release was facilely built via engineering 3D reversible gel-like nanofibers based on pH-responsive copolymer containing sensitive photo-crosslinker and stiffness tunable polymer. This strategy can be used to address the case-by-case issue of drugs loaded in the matrix via in-situ-trapping drugs in the crosslinked gel-like nanofibers. The cumulative release profiles and release kinetics upon different pH indicate that 3D reversible gel-like nanofibrous mat can stably control the drug release for more than 80 h. Moreover, the 3D nanofibrous release system behaves sustained and pH-controlled release of drugs, thereby contributing to satisfying targeted drug release therapy for weakly acidic pathological tissues.
研究领域:
生物材料学
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药剂学
·
纳米医学
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2025
·
IF 12.4
Lei Zhou,Dian Wang,Jiayu Yu,Hongyi Zhang,Hang Dong
Nitrogen recovery from urine and CO 2 utilization are both vital for achieving a circular economy and mitigating climate change. Divided engineering solutions have been proposed to address either problem, but there is still a lack of integrated technologies to simultaneously tackle the two tasks. We demonstrated CO 2 -driven ion exchange for nitrogen recovery (CIXNR) from urine and evaluated the process in Malawi. By comprehensively studying the ion exchange chemistry using a proton-form weak acid cation exchanger (WAC-H), we revealed the suppressed adsorption capacity caused by counterion releasing. Regulating aqueous pH optimized the WAC-H capacity, particularly, by the natural buffering capacity provided by bicarbonate in the hydrolyzed urine. CO 2 regeneration achieved over 75 % nitrogen recovery in a multi-cycle test with synthetic hydrolyzed urine. A higher CO 2 pressure resulted in faster regeneration kinetics due to a lower aqueous pH and higher proton concentration gradient. Our field outreach activity in Malawi indicated future research demand in adapting the system for resource-limited, rural, and no-electricity areas. We envision this study to inspire more integrated solutions to tackle both circular economy and climate actions and call for more field outreach activities to facilitate urine technology adoption in developing countries.
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
ChemCatChem
·
2024
·
IF 3.8
Mingwei Wang,Zhen Shi,Zhiquan Yu,Shushuang Li,Zhixin Zhang,Feng Wang
Graphical The HCHO-acetaldehyde condensation is a typic aldol reaction and a critical step to produce 1,3-propanediol from methanol and ethanol. The cross condensation of HCHO and acetaldehyde to acrolein has been conducted over MgO/SiO 2 catalyst, which shows the synergistic catalysis by the acidic sites (Mg-O-Si structure) and basic sites (Mg-O-Mg structure) for activation of HCHO and acetaldehyde, respectively. Acid-base synergistic catalysis greatly enhances the performance of MgO-based catalysts in the Aldol condensation. In this paper, the effect of acid-base strength/concentration/proportion and the synergistic catalysis on the performance of cross condensation between HCHO and acetaldehyde were studied. The NH 3 /CO 2 -TPD results indicated that the weak acidic sites combined with the medium basic sites were beneficial for the cross condensation of formaldehyde and acetaldehyde. The loading of MgO nanocrystals on SiO 2 induced the generation of new acidic sites (Mg-O-Si). Combined with the inherent basic sites (Mg-O-Mg) and Mg-O-Si, the acid-base bifunctions sites could catalyze the cross condensation of HCHO and acetaldehyde synergistically. The appropriate proportion of acidic/basic sites (10/1) was critical for the cross condensation in the presence of vast water in formalin. The effect of reaction parameters, including molar ratio of substrates, reaction temperature, linear velocity and weight hourly space velocity, were investigated for the cross condensation. The results showed that 10 wt% MgO/SiO 2 catalysts exhibited the highest catalytic activity (57.9% conversion of acetaldehyde and 84.3% selectivity of acrolein) under the optimal reaction parameters among the investigated catalysts. The catalytic performance of MgO/SiO 2 could be recovered after in situ regeneration in air to remove the carbon deposition.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Biomaterials Science
·
2018
·Vol. 7
·期 1
·336-346
·
IF 5.831
Dong Chen,Huangyong Jiang,Dongbo Guo,Wumaier Yasen,Junping Ao,Yue Su,Dongsheng Pan,Xin Jin,Xinyuan Zhu
Cationic gelatin nanoparticles ((+)nGNPs) were prepared by in situ polymerization upon the surfaces of monodispersed gelatin nanoparticles (GNPs) using N-(3-Aminopropyl)methacrylamide (APm) as monomer, which were then decorated with doxorubicin terminated poly(2-methylacryloyloxyethyl phosphorylcholine) (DOX-pMPC) via EDC/NHS conjugation to obtain core–shell nanoparticles ((+)nGNPs@DOX-pMPC) for cancer therapy. The non-fouling pMPC shell could effectively shield the positively charged surface of inner nanoparticle and prevent non-specific protein adsorption, thus endowing the materials with potential for long-acting cancer treatment. Furthermore, the acyl hydrazone bond connecting DOX and pMPC chain could be easily hydrolyzed in the weakly acidic tumor microenvironment. After decladding of the pMPC shell, electropositive (+)nGNPs carrying the drugs can be effectively internalized by cancer cells to induce apoptosis, avoiding undesirable hindrance caused by the superhydrophilic outer layer. On combining the above properties, this drug delivery system can be a promising candidate for long-acting, low-toxicity and high-efficiency cancer therapy.
研究领域:
纳米技术
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药学
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癌症治疗
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药物递送系统
✓ 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）