INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Conglu Zhang,Zezhi Chen,Wei Guo,Chengwu Zhu,Yajie Zou
A facile method for the fabrication of crosslinked chitosan/graphene nanoplates composite sphere (CS/GNPs) was presented. The obtained samples were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopic (XPS) and thermogravimetric analysis (TGA). The adsorption activities of CS/GNPs for methyl orange (MO) and acid red 1 (AR1) were evaluated such as the effect of pH and GNPs content, as well as adsorption kinetics and isotherms. In view of practical, the reusability of CS/GNPs was also tested. The resulting adsorption capacity for MO is 230.91 mg g −1 and 132.94 mg g −1 for AR1, respectively. After saturated adsorption, CS/GNPs can be efficiently regenerated and reused with little uptake loss. Therefore, CS/GNPs is the apromising adsorbent with non-toxic, efficient, low-cost and easy to prepare for the dye removal.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 7
·4227-4243
·
IF 1.674
Deng Anquan,Zhu Yufu
TiO 2 /SiO 2 /Ag/Ag 2 O and TiO 2 /Ag/Ag 2 O nanocomposite spheres have been synthesized via a low-temperature hydrothermal method using SiO 2 spheres as templates, combined with a light-induced reduction method and a hydrogen peroxide oxidation process. Scanning electron microscopy, energy-dispersive X-ray and X-ray diffraction analyses have demonstrated that Ag and Ag 2 O nanoparticles were successfully deposited on the surfaces of TiO 2 /SiO 2 nanocomposite spheres and porous TiO 2 nanospheres forming nanoheterojunctions. The photocatalytic experiment results reveal that all the as-prepared catalysts possess improved photocatalytic activities compared with P25 nanoparticles. Both TiO 2 /SiO 2 /Ag/Ag 2 O and TiO 2 /Ag/Ag 2 O nanocomposite spheres exhibit excellent photocatalytic performances, which can be attributed to the synergistic effects of different kinds of nanoparticles. The synergistic mechanism of these nanoparticles is also discussed in detail.
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
CELLULOSE
·
2023
·Vol. 30
·期 16
·10427-10436
·
IF 5.7
Wu Yuhang,Li Yuwen,Zheng Yanchun,Yao Juming,Gao Junkuo
Metal–organic frameworks (MOFs) have received widespread attention in recent years. However, the powder form of MOFs limits their large-scale applications. To facilitate the application of MOFs, mass production and shaped manufacturing of MOFs is significantly effective. Herein, a generic method based on a simple polymerization technique is proposed to prepare highly porous MOF–cellulose composite beads and the application of these composite beads in dye removal and recovery is displayed. Non-toxic solvent water and biodegradable sodium carboxymethylcellulose (CMC) were used as raw materials in the synthesis method. In addition to maintaining the crystallinity and porosity of the MOFs embedded in the cellulose matrix, the unique three-dimensional lamellar interconnected structure provides good mechanical properties for the composite beads. To demonstrate the practicality of these composite beads, a recycling processing system was built as a proof-of-concept device. MIL-100/CMC-HD can effectively degrade more than 95% of the dye and can be recycled multiple times. The superiority of the MOF–cellulose composite beads is highlighted by their ease of recycling and storage compared to MOF powder. Graphical abstract MOF/carboxymethylcellulose porous composite beads are synthesized in a simple one-step process. The lamellar interconnected structure not only facilitates the diffusion of contaminants in water but also provides good mechanical properties.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 19
·11124-11134
·
IF 2.599
Zhang Runlin,Xie Jiwei,Wang Chao,Liu Jing,Zheng Xianfeng,Li Yu,Yang Xiaoyu,Wang Hong-En,Su Bao-Lian
Solar-driven hydrogen (H 2 ) generation utilizing photocatalysts has received extensive attention because of its potential to mitigate the global energy crisis and environmental problem. The implementation of efficient H 2 production strongly relies on stable, active, and low-cost photocatalysts. In this work, we report the designed synthesis of macroporous ZnO/ZnS/CdS composite spheres as a highly active photocatalyst for H 2 production via solar-driven water splitting. The composite spheres were synthesized by a facile solvothermal reaction paired with controllable ion-exchange processes. The resulting material exhibits superior photocatalytic activity, delivering a high H 2 production rate of ~11.37 mmol h −1 g −1 under light illumination (250–780 nm, with an ultraviolet light intensity of 34 mW cm −2 and visible light intensity of 158 mW cm −2 ). Such performance enhancement can be mainly ascribed to the synergic effects of the composite structure: (1) formation of coherent ZnO/CdS and ZnS/CdS heterojunctions at nanoscale, facilitating charge separation of photoinduced electron/hole pairs, (2) highly accessible inner surface of the meso/macroporous ZnO/ZnS/CdS composites for rapid mass transfer of electrolyte, and (3) enhanced visible light scattering capability induced by their large particle size.
研究领域:
材料科学
·
能源科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2022
·
IF 4.966
Bo Li,Ming Li,Panpan Zhang,Yuanfeng Pan,Zhihong Huang,Huining Xiao
Novel porous cellulose/chitosan composite spheres loaded with nanoscale zero-valent iron (nZVI/PCSs) were fabricated for the removal of Cd (II) from aqueous solution and the remediation of Cd species in contaminated soil. The green-based nZVI/PCSs exhibited the improved dispersion and antioxidability of nZVI compared to the pristine one. The results from SEM/EDS suggested that the Fe (0) took part in the adsorption of the Cd (II) ions; whereas XPS analysis revealed that Fe (0) and amino groups in nZVI/PCSs played crucial roles in Cd (II) removal via the effects of precipitation or chelation. The results of the experiments in aqueous solution and model fitting showed that the adsorption of Cd (II) induced by nZVI/PCSs was better described by Langmuir isotherm and the maximum adsorption capacity reached up to 110.3 mg/g. The soil remediation tests demonstrated that nZVI/PCSs could significantly enhance cadmium immobilization, enabling the conversion of most exchangeable Cd species to Fe Mn oxides and organic matters in contaminated soil after the remediation. Overall, nZVI/PCSs have great potential as an excellent adsorbent with cost-effectiveness in Cd (II) removal from the aqueous solution and the remediation of Cd species in contaminated soil phases.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Zhouyu Huang,Yongfeng Yuan,Zhujun Yao,Mingzhen Xiu,Yong Wang,Yizhong Huang,Shaoyi Guo,Weiwei Yan
Co 1.11 Te 2 nanoparticles are in-situ uniformly grown within mesoporous hollow carbon combination sphere (MHCCS@Co 1.11 Te 2 ) using a hard-template and spray drying process, solution impregnation and pyrolysis tellurization. Material characterizations reveal that Co 1.11 Te 2 , with a diameter of ∼ 20 nm, is attached to the internal walls of the unit spheres or embedded in the mesopore shells of the unit spheres, presenting a distinctive “ships-in-combination-bottles” nanoencapsulation structure. In sodium-ion half-cells, MHCCS@Co 1.11 Te 2 exhibits excellent cycling stability, achieving reversible capacities of 257 mAh/g at 0.5 A/g after 250 cycles, 235 mAh/g at 1.0 A/g after 300 cycles and 161 mAh/g at 10.0 A/g after 1900 cycles. Electrochemical kinetic analyses and ex-situ characterizations reveal rapid electron/Na + transport kinetics, prominent surface pseudocapacitive behavior, robust nanocomposite structure, and multi-step conversion reactions of sodium polytellurides. In sodium-ion full-cells, MHCCS@Co 1.11 Te 2 still demonstrates stable cycling performance at 1.0 and 5.0 A/g and excellent rate capability. The superior electrochemical performance is associated with the nanoencapsulation structure based on mesoporous hollow carbon combination spheres, which promotes electron conduction and Na + transport. The space-confined effect maintains the high electrochemical activity and cycling stability of Co 1.11 Te 2 .
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Tian Hu,Wen-Zhao Chen,Huaitian Bu,Wei-Xiong Li,Zeng-Lin Li,Bu-Ning Liu,Ling-Min Lan,Chuigen Guo,Qingwen Wang,Gang-Biao Jiang
This paper proposes a fast, facile and eco-friendly strategy for removing Cd from soil. By combining two types of floatable alginate-derived multifunctional spheres: magnetic hollow carbon composite (MHCC) and calcium alginate aerogel (CAA) spheres, the fixed state Cd in soil is activated and removed sequentially. MHCC spheres activate and desorb the solid phase anchored Cd into mobile Cd 2+ ions, and CAA spheres effectively absorb the free Cd 2+ ions from the liquid phase via the massive absorption sites of carboxy and hydroxy groups. The remediation results of 5-round successive MHCC-CAA treatments (1.5 g MHCC-0.45 g CAA in 60 g soil) show that 44.02% of Cd is removed from the soil. MHCC spheres demonstrate excellent recyclability of 88.87 and 94.45% in flooding and non-flooding soil, respectively. The texture, cation exchange capacity (CEC) and pH value of the remediated soil suggest that the MHCC-CAA system has little interference on the soil properties. No remarkable hindrance of microbial growth by MHCC or CAA spheres is observed in the eco-toxicological test, indicating the ecological friendliness of MHCC-CAA remediation system.
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
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2015
·Vol. 75
·期 1
·82-89
·
IF 1.532
Xiao Zuo-Yi,Huang Shu-Xian,Zhai Shang-Ru,Zhai Bin,Zhang Feng,An Qing-Da
Abstract A one-pot method was introduced to fabricate Ag–SiO 2 hollow composite spheres with developed porosity by employing monodisperse carboxylic-capped polystyrene (PS–COOH) spheres as a hard template. During the synthetic process, Ag + ions were immediately anchored on the surface of the PS–COOH spheres via electrostatic interaction and readily reduced by employing polymethylhydrosiloxane (PMHS) as a reducing agent. At the same time, silica oligomers derived from the hydrolysis of PMHS and TEOS were slowly deposited on the PS–COOH spheres to form solid silica shells. Subsequent decomposition of the PS–COOH spheres in air induced the formation of Ag–SiO 2 hollow spheres. The as-prepared products were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy and N 2 absorption–desorption study. The results show that the well-designed composite spheres featured thin and spherical silica shell (~10 nm), large surface area (>240 m 2 g −1 ) and mesopore (6.0–9.0 nm). In addition, the Ag–SiO 2 hollow composite spheres exhibited high catalytic performance toward the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP). Graphical Abstract A one-pot method was reported to prepare Ag–SiO 2 hollow spheres with well-developed porosity, which exhibited high catalytic performance and durable activity for the reaction of 4-NP to 4-AP.
研究领域:
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 46
·23230-23239
·
IF 7.443
Chenhao Du,Yun Guo,Yanglong Guo,Xue-qing Gong,Guanzhong Lu
Developing methods for the fabrication of active and thermally stable noble metal/metal oxide nanomaterials are very important for catalysis and material fields. Herein, we used a polymer-template synthesis approach to prepare hollow Pd–CeO2 nanocomposite spheres (NCSs) with Pd nanoparticles evenly distributed inside the CeO2 shell, in which the aggregation of Pd nanoparticles can be well inhibited with the help of the protection of CeO2 nanocrystallites even after being calcined at 700 °C. The Pd nanoparticles are partially buried in the CeO2 shell and the surface Pd species are highly ionic, which is caused by the electron exchange at the Pd–CeO2 interface during calcination. This hollow structure Pd–CeO2 nanocatalyst shows excellent catalytic activity and stability in the aqueous selective reduction of 4-nitrophenol and gaseous CO oxidation. For the selective reduction of 4-nitrophenol, the reaction rate of this h-Pd–CeO2 NCS catalyst compared to those of the supported Pd/CeO2 and physically mixed Pd + CeO2 catalysts is almost 14 times and 5 times faster, respectively. For the CO oxidation, the larger Pd–CeO2 interface in h-Pd–CeO2 NCSs could facilitate the reaction between the adsorbed CO and O2, thus showing better low temperature activity. This paper emphasizes the advantages of a core–shell hollow structure and provides a new way for obtaining novel functional nanocatalysts.
研究领域:
材料化学
·
纳米催化
·
无机功能材料
·
环境催化
·
能源材料
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
·
2023
·
IF 6.9
Senjian Han,Chao Gao,Wenfeng Yan,Yafei Guo,Shiqiang Wang,Tianlong Deng
Radioisotope leaking from nuclear waste has become an intractable problem due to its gamma radiation and strong water solubility. In this work, a novel porous ZnFC-PA/PSF composite sphere was fabricated by immobilization of ferrocyanides modified zinc phytate into polysulfone (PSF) substrate for the treatment of Cs-contaminated water. The maximum adsorption capacity of ZnFC-PA/PSF was 305.38 mg/g, and the removal efficiency of Cs + was reached 94.27% within 2 hr. The ZnFC-PA/PSF presented favorable stability with negligible dissolution loss of Zn 2+ and Fe 2+ (< 2%). The ZnFC-PA/PSF achieved high-selectivity towards Cs + ( K d = 2.24×10 4 mL/g) even in actual geothermal water. The adsorption mechanism was inferred to be the ion-exchange between Cs + and K + . What's more, ZnFC-PA/PSF worked well in the fixed-bed adsorption ( E = 91.92%), indicating the application potential for the hazardous Cs + removal from wastewater.
研究领域:
环境科学
·
材料科学
·
核废料管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2016
·
IF 1.78
Ruijing Li,Kexin Chen,Geng Li,Guoxiang Han,Sheng Yu,Juming Yao,Yurong Cai
Porous microspheres fabricated from bioceramics have great potential for cell delivery in injectable tissue engineering application. The size and structure of pores in the microspheres are important for the effective protection and transportation of cells. In this study, porous hydroxyapatite microspheres are fabricated through the water-in-oil emulsion method followed by a calcination treatment at the high temperature. Both self-made resorcinol-formaldehyde (RF) composite spheres and camphene are used as pore-forming agents to produce big pores corresponding to the size of RF spheres and connected channel among big pores in hydroxyapatite matrix. The properties of the microspheres are characterized using X-ray diffraction, thermogravimetry analysis, universal material machine, field emission scanning electron microscopy . Cell assays are carried out to evaluate the cellular compatibility of the microspheres. The results showed that the hydroxyapatite microspheres with controllable pore structure and high porosity could be fabricated by this method, which have better strength to resist the compressive force. The microspheres are conducive to support adhesion, proliferation and differentiation of MC3T3-E1 cells. The results indicate that the obtained porous hydroxyapatite microspheres can be a permeable microenvironment for cell delivery in injectable tissue engineering.
研究领域:
生物材料
·
组织工程
·
生物陶瓷
·
细胞生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2011
·
IF 3.068
Xiaoyin Zhang,Yuan Ren,Min Chen,Limin Wu
This paper presents a feasible and efficacious procedure to synthesize polystyrene/upconversion nanocrystals (PS/UCNCs) nanocomposite spheres with raspberry-like structure via an in situ dispersion polymerization technique. During this process, polyacrylic acid (PAA) as stabilizer plays the key role in adsorbing UCNCs, including NaYF 4 :Yb 3+ –Er 3+ , NaYF 4 :Yb 3+ –Tm 3+ and NaYF 4 :Yb 3+ –Ho 3+ onto the PS surfaces. TEM and SEM images confirmed the raspberry-like morphology of the obtained nanocomposite spheres. The effect of synthetic conditions, for instances, PAA amount, type and concentration of UCNCs on the structure and fluorescence of the PS/UCNCs nanocomposite spheres were studied in detail.
研究领域:
材料科学
·
纳米技术
·
高分子化学
✓ 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）