CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Dun Fu,Tonni Agustiono Kurniawan,Heng Li,Liuying Wang,Zheng Chen,Wen Li,Yuanpeng Wang,Haitao Wang,Qingbiao Li
The technical applicability of hydrochar-derived pyrolysis char-supported Cu nanoparticles composite (Cu NPs/HDPC) to the degradation of octocrylene (OC) was investigated in aqueous solutions in the presence of H 2 O 2 . The physico-chemical properties of the Cu NPs/HDPC composite before and after degradation reaction were described. The role of OH in this H 2 O 2 -led degradation was examined using electron spin resonance (EPR) technique. The possible degradation mechanisms of OC by the Cu NPs/HDPC-H 2 O 2 system and its degradation pathways were investigated. A relatively large surface area and pore volume of the HDPC (191.4 m 2 g −1 and 0.11 cm 3 g −1 , respectively) resulted in well-dispersed Cu NPs loading on the surface. The degradation efficiency of OC (50 μM) was 97.0% in the presence of Cu NPs/HDPC composite (0.5 g L −1 ) and H 2 O 2 (20 mM) at pH 5.6 in 4 h, which was significantly higher than in Cu NPs/biochar and the integrated HDPC-Cu NPs, i.e., 62.4% and 79.7%, respectively, under the same conditions (ANOVA test; p ≤ 0.05). Several oxidation by-products of the OC included benzophenone, 3,3-diphenylacrylonitrile, and others. The OH, which resulted from the Fenton-like oxidation between the Cu species and H 2 O 2 on the HDPC surface, was the predominant factor responsible for the OC degradation in the solution. The OH formation was facilitated by a single-electron transfer process from the HDPC surface, in which the Cu NPs/HDPC composite with its C OH functional group promoted the decomposition of H 2 O 2 . These findings contribute to a novel approach of cost-effective wastewater treatment by adding value to unused waste materials from agricultural industries.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
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2023
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IF 5.9
Maofu Geng,Yuhong Tao,Zhenyu Zhang,Yuewen Dai,Juncheng Huang,Fei Liu,Haining Na,Jin Zhu
Through analysis of the transformation of carbon sources including glucose, fructose, and 5-hydroxymethylfurfural in hydrothermal carbonization (HTC) and the adsorption of carbon tubes (CNTs) with them, the formation mechanism of a hydroxyl-rich carbon layer on the CNT surface is clearly revealed. During HTC, the adsorption of furan and aromatic clusters and even primary particles by CNTs by π–π interaction is noticed as the key condition to improve the utilization rate of carbon sources and the quality of the carbon layer. The coated CNTs own a hydroxyl-rich carbon layer with a thickness of several nanometers on its surface, which provides the ability for functional applications. With the use of the hydroxyl-rich carbon layer-coated CNTs, a low-acid aqueous system is established for the hydrolysis of cellulose to sugar. Accordingly, the cellulose conversion and glucose yield are obviously improved. The route of HTC for hydroxylation of CNTs not only fundamentally avoids the use of strong acid oxidation in traditional method but also provides the useful guidance to prepare functional carbon materials with application prospects.
研究领域:
材料科学
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生物化学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
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2021
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IF 5.097
Haijun Zhang,Yiru Di,Qi Yang,Xiaomeng Zhou
Fire safety in civil aviation requires high-performance flame retardants to control the flammability of epoxy (EP) resins used widely in aircrafts. In this study, a novel and nanoscale hybrid flame retardant was designed with incorporated layered double hydroxide (LDH) nanosheets, −OH-functionalized carbon nanotubes (CNTs)(−OH), and hydroxyapatite (HA) nanoparticles. Experimental characterizations and theoretical simulations demonstrated that the interwoven networks of CNTs afford a supporting framework to ensure homogeneous dispersion of LDH nanosheets and HA nanoparticles and also enhance the mechanical strength of the flame-retardant-treated EP resin substrate. This newly designed flame retardant exhibits pronounced flame retardation performance, as shown by the low peak heat release rate of 580 kW/m2, notably small total heat release rate of 20.8%, relatively low CO production of 0.030 g/s, high limit oxygen index of 30.5%, and high char yield of 23.3% at 700 °C. These remarkable flame retarding properties result from synergism among LDH, CNT(−OH), and HA components, which is demonstrated using both theoretical and experimental analyses. This work will provide new insights into the design of highly efficient nanostructured flame retardants for EP resins.
研究领域:
材料科学
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航空工程
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化学工程
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DOI
高影响因子
CARBON
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2019
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IF 7.466
Hongfei Zhao,Shuaijun Wang,Fengting He,Jinqiang Zhang,Lin Chen,Pei Dong,Zhaoxin Tai,Yongqiang Wang,Haitao Gao,Chaocheng Zhao
Hydroxylated multi-walled carbon nanotubes modified with a carbon nitride nanobelt (HCNT/CNN) were successfully fabricated by using combined solvothermal and ultrasonic methods to improve both tetracycline hydrochloride (TC) degradation and H 2 evolution. The well-designed photocatalysts exhibited a wide light absorption range, low photoluminescence (PL) intensity, high photocurrent , and small electrochemical impedance spectroscopy (EIS) arc; these properties significantly enhanced the overall photocatalytic efficiency. At the optimal loading of HCNT (0.05 wt%), the resulting HCNT/CNN exhibited the highest TC photocatalytic degradation rate , and the H 2 production rate reached 175.5 μmol g −1 h −1 . Compared to the multi-walled carbon nanotube modified carbon nitride nanobelt, the TC photocatalytic degradation rate and H 2 production rate of HCNT/CNN increased by factors of 3 and 4.2, respectively. This significantly enhanced performance can be ascribed to the formation of hydrogen bonds between HCNT and CNN, which facilitates the electron transfer from the CNN to the HCNT surface, thereby accelerating the separation of photogenerated charge carriers. Moreover, the possible mechanism of the improved photocatalytic performance for the HCNT/CNN composites was proposed. This study provides the guidance for the design of novel carbon nitride nanobelt-based photocatalysts for wastewater purification and H 2 evolution.
研究领域:
材料科学
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环境科学
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化学
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2024
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IF 2.8
Jinxia Wang,Shuiqing He,Hong Yuan
BACKGROUND A solid acid (SPEI–EN–OHCMs) having dendritic –NH 2 groups was prepared via oxidation of hydrothermal carbon microspheres (OHCMs) followed by a condensation reaction with the –NH 2 groups of polyethyleneimine and sulfonation. The mechanism by which –COOH groups on the surfaces of OHCMs reacted with these –NH 2 groups was assessed using density functional theory (DFT). RESULT Activation using a combination of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC) and N -hydroxysuccinimide (NHS) was found to promote the formation of amide bonds such that –NH 2 groups were bonded to the microsphere surfaces. This effect provided more bonding sites for –SO 3 H groups. The DFT results indicated that the energy barrier on the potential energy surface in the presence of EDC and NHS was lowered by 18.1 kcal mol −1 . X-ray photoelectron spectroscopy analyses also confirmed the introduction of –NH 2 groups followed by –SO 3 H groups onto the surfaces of the OHCMs. The concentration of surface acid sites on SPEI–EN–OHCMs was found to be as high as 11.8 mmol g −1 . Thermogravimetric data and elemental analysis results showed that the –SO 3 H groups on the SPEI–EN–OHCM surfaces were thermally stable below 180 °C. CONCLUSION The SPEI–EN–OHCMs catalyst was used to promote the transesterification reaction of waste frying oil with methanol. A trial with a methanol-to-oil molar ratio of 10:1 at 110 °C for 4 h gave a fatty acid methyl ester (FAME) yield of 92.3%. After four reuses, an SPEI–EN–OHCMs specimen provided a FAME yield of 54.3%. © 2024 Society of Chemical Industry (SCI).
研究领域:
化学工程
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催化材料
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理论化学
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产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2022
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IF 9.463
Xiaohui Guo,Weiqiang Hong,Yunong Zhao,Tong Zhu,Hongjin Li,Guoqing Zheng,Jingyi Wang,Guopeng Tang,Jiaxu Cao,Yifan Wang,Jinyang Yang,Huishan Zhang,Deyi Zhou,Rui Feng,Decheng Xu,Qi Hong,Yaohua Xu
Herein, inspired by the tactile perception architecture of human skin, including the epidermis and touch receptor, skin-like flexible pressure sensors were fabricated via the assembly of a sandwich structure composed of an encapsulation layer (bionic epidermis), a piezoresistive sensing layer (bionic touch receptor), and a transducer layer. The piezoresistive sensing layer composed of graphene oxide/ hydroxyl functionalized carbon nanotubes/bovine serum albumin (GO/CNTs/BSA) nanocomposites with wavy microstructures was fabricated using layer-by-layer (LBL) self-assembly technology. The mechanisms of hydrogen bond and electrostatic interactions may improve the adhesion efficacy of the textile substrate with conductive nanomaterials . Based on the skin-like architecture for pressure sensing, the sensor exhibited the sensing characteristics, including wide pressure-detecting range (0∼171 kPa), high sensitivity (2.456 kPa −1 ), rapid response/recovery time (225 ms and 50 ms), and outstanding durability (2000 cycles). Our work provide references for textile-based electronic devices that can be applied to intelligent robotics, wearable monitoring, and man–machine interaction.
研究领域:
材料科学
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生物医学工程
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柔性电子
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2025
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IF 5.4
Si Shen,Lihui Gao,Shulei Li,Yanhong Liu,Hongyang Mao,Keyi Xu
Natural germanium (Ge)-containing minerals usually have low Ge concentrations, which poses many challenges for Ge enrichment and recovery. Therefore, it is imperative to explore efficient processes for Ge recovery from secondary resources. In this study, an alginate-based adsorbent (HCNTs-SA) with excellent adsorption performance for Ge was synthesized by optimal preparation conditions (2 % ( w / v ) sodium alginate (SA) concentration, a 1:15 mg HCNTs /mg SA hydroxylated carbon nanotubes (HCNTs) dosage, and 0.075 mol/L calcium chloride (CaCl 2 ) concentration). The adsorbent had a spherical shape with a layered void structure and improved swelling property (increased by 1200 %). The adsorption process of Ge by HCNTs-SA followed pseudo-second order kinetics and Langmuir adsorption isotherm, which indicated that the primary adsorption behavior was monolayer chemisorption with a maximum theoretical capacity of 151.44 mg/g at pH = 11 and 1.00 g/L adsorbent dosage, exceeding both pure alginate gels and previously reported materials. Meanwhile, HCNTs-SA exhibited high selectivity for Ge. In the Ge/Si binary system, the selectivity coefficients of Ge for HCNTs-SA were all greater than 1.00, indicating its exceptional affinity for GeO(OH) 3 − as compared to SiO 3 2− . According to FTIR, XPS analysis and DFT calculations, the primary adsorption mechanisms of Ge by HCNTs-SA were revealed as complexation and hydrogen bonding, with hydroxyl and carboxyl groups identified as key adsorption sites. This work demonstrates that HCNTs-SA is a promising adsorbent for selective Ge recovery from alkaline solutions.
研究领域:
材料科学
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环境工程
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化学工程
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吸附技术
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产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
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2025
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IF 12.5
Zeyuan Lu,Kunquan Li,Tinglin Yang,Shengye Chen,Xiaojing Su,Huali Xie,Xiaojuan Ao,Wenjian Wu
Aerogels are widely used in environmental remediation, but their application is hindered by brittleness, limited oil absorption and poor separation of viscous crude oil. In this study, a multifunctional superhydrophobic aerogel with electrothermal and photothermal effects was prepared from bacterial cellulose (BC), methyltrimethoxysilane (MTMS), and hydroxylated carbon nanotubes (HCNT) by soft-hard synergistic and directed freezing. The prepared aerogel exhibited an oriented layered porous structure with excellent compressibility and oil retention capacity. The aerogel maintained 250 cycles of 25 % strain compression without structural degradation. Because of the presence of Si-CH 3 , the aerogel maintained a water contact angle above 153° across pH 1–13 and retained superhydrophobicity (WCA˃150°) even after severe abrasion. The prepared aerogel exhibited excellent absorption capacities for various organic solvents and oils, ranging from 45 g/g for n-hexane to 112 g/g for dichloromethane, and retained 96 % of dichloromethane through capillary locking. The well-dispersed HCNT enabled efficient photothermal (117.7 °C) and electrothermal (126.7 °C) conversion, facilitating rapid and continuous separation of crude oil/water mixtures at high fluxes (4.47 × 10 4 kg·m −3 ·h −1 and 8.15 × 10 4 kg·m −3 ·h −1 under photothermal and electrothermal conditions, respectively). This material holds great potential for practical application in high efficiency oil-water separation, particularly in challenging conditions involving viscous crude oil.
研究领域:
环境科学
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材料科学
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化学工程
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纳米技术
✓ 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）