Reaction Kinetics Mechanisms and Catalysis
·
2018
·Vol. 125
·期 2
·1179-1190
·
IF 1.515
Mao Yong,Wu Mingzai,Li Guang,Dai Peng,Yu Xinxin,Bai Zhiman,Chen Peng
For highly efficient photodegradation of organic pollutants, the enhancement of photocatalytic activity of metal-free photocatalyst graphitic carbon nitride (g-C 3 N 4 ) under visible light irradiation is meaningful, but still challenging due to the fast recombination of photogenerated electron–hole pairs, low quantum efficiency and specific surface area of pristine g-C 3 N 4 . To address these challenges, boron-doped g-C 3 N 4 together with nitrogen-vacancies (Bd-Nv-C 3 N 4 ) was designed and synthesized through a simple acid-assisted calcination of melamine without any further tedious operations. As expected, based on the synergistic effect of foreign elements doping (boron atoms doping) and intrinsic defects (nitrogen vacancies), the as-prepared novel Bd-Nv-C 3 N 4 photocatalyst shows lower band gap, higher surface area and separation efficiency of photogenerated electron–hole pairs, achieving a nearly tenfold increase of the phtocatalytic constant for methylene blue (MB) degradation compared to that of pristine g-C 3 N 4 without nitrogen-vacancies and boron-doping. This study provides a new train of thought and method for the design and preparation of nonmetal photocatalysts with enhanced visible light irradiation photocatalytic performance.
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2013
·Vol. 1
·期 35
·10292-10299
·
IF 0
Ling Li,Xiao Lan Liu,Hong Yun Geng,Bin Hu,Gong Wu Song,Zu Shun Xu
The adsorption of methylene blue (MB) from aqueous solution on a HKUST-1/GO (MOFs : HKUST-1) composite was studied in view of the adsorption isotherm, kinetics and regeneration of the sorbent. The adsorption isotherms of methylene blue (MB) on the HKUST-1/GO composite followed both the Freundlich isotherm and the Langmuir isotherm. Adsorption kinetics and thermodynamic parameters were determined from the experimental data. The used HKUST-1/GO could be regenerated by acetone, so it can be recycled for reuse. The high adsorption capacity and excellent reusability make HKUST-1/GO attractive for the removal of MB from aqueous solution.
✓ 已验证
DOI
INDUSTRIAL CROPS AND PRODUCTS
·
2020
·
IF 4.244
Dengfeng Wang,Zongqian Wang,Xianhong Zheng,Mingwei Tian
Activated carbon fiber (ACF) has broad application prospects in dyeing wastewater purification owing to its high specific surface area and hierarchical pore distribution. Natural fiber based ACFs is a group of emerging biomass adsorbent with attractive potential adsorbent properties. Herein, we develop a facile carbonization strategy to obtain a novel biomass ACF derived from the seed hair fibers of metaplexis japonica (MACFs), and the prepared MACFs possess hollow structure and the formation of graphite-like crystallites from MACFs is promoted by high temperature of carbonization. MACFs possess well-developed pore distribution, with a maximum specific surface area and total pore volume of 1882.003 m 2 /g and 1.613 cm 3 /g, respectively. MACFs exhibits the maximum adsorption capacity to be 943.372 mg/g for methylene blue (MB) fitting well with Langmuir model. Furthermore, MACFs can adsorb full solution of 90 mg/l by filtering only one time, proving its fast-adsorption performance. The high adsorption capacity and speed of MACFs are mainly attributed to three factors: high specific surface area and rich pores benefited from the full activation of hollow fibers, strong electrostatic attraction to MB provided by surface groups, and good contact with dye liquor. This work may shed light of the adsorption mechanism of biomass ACFs for the dyeing molecules and pave the way for the development of low-cost and highly efficient adsorbent.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Wenbo Wang,Guangyan Tian,Zhifang Zhang,Aiqin Wang
Silicate materials have been frequently used as stable, low-cost and efficient adsorbents for the removal of dyes and heavy metal ions from aqueous solution. Herein, at the aim of designing new adsorbent with higher adsorption capacity, natural palygorskite (PAL) was modified via a one-step hydrothermal process by introducing sodium silicate and magnesium salts. The effect of Si/Mg dosage ratio on the structure and physico-chemical features of the adsorbent was investigated, and its adsorption capability for Methylene blue (MB) and Cu(II) ions was intensively evaluated. It was found that Si/Mg dosage ratio is the key to control the adsorption properties of the adsorbent. The active magnesium silicate could be formed around PAL at the moderate Si/Mg dosage ratio, and even the undesirable quartz impurities without adsorption activity in the natural PAL minerals may transform as amorphous magnesium silicate with higher adsorption activity in this process. The adsorbent shows greater BET specific surface areas (407.3 m 2 /g), ideal surface charge distribution and superior adsorption capacity to MB and Cu(II) ions, with the maximum adsorption capacity of 527.22 mg/g for MB and 210.64 mg/g for Cu(II) ions at the Si/Mg dosage ratio of 2:1. The MB molecules and Cu(II) ion could be almost completely removed from 100 mg/L of MB solution and 25 mg/L of Cu(II) solution by the adsorbent, respectively, which is far away higher than that of raw PAL. The electrostatic attraction, ion exchange and chemical association of –Si–O − groups contribute to the enhanced adsorption for MB or Cu(II) ions.
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2015
·Vol. 6
·期 4
·1222-1232
·
IF 5.426
Yunus Ahmed,Zahira Yaakob,Parul Akhtar
A SiO2-supported Fe and Ni bimetallic catalyst has been synthesized, characterized and, for the first time, tested as a heterogeneous photo-Fenton catalyst for the degradation and mineralization of methylene blue (MB) dye. The morphological, structural, and optical properties of this catalyst were analyzed using FESEM, XRD, FTIR and UV–vis spectroscopy. The photocatalytic degradation of MB has been investigated using Fe–Ni/SiO2 catalysts under visible and solar light irradiation in aqueous solutions. The effects of solution pH, H2O2 concentration, initial MB concentration, catalyst dosage and light intensity on the degradation of MB have been systematically investigated. An almost complete degradation was achieved within 60 min with a solution pH of 3.00, a H2O2 concentration of 3.0 mM L−1 and a catalyst dose of 0.85 g L−1. The degradation and total organic carbon (TOC) removal efficiencies were 99.80% and 86.19%, respectively, for sunlight. However, the values were only 99.01% and 75.71% for visible light. These results suggested that Fe–Ni/SiO2 possesses significant catalytic activity, and the solar-Fenton process is a feasible method for degrading and mineralizing the MB dye compared with artificial visible light. The catalytic action is attributed to H2O2 and the formation of hydroxyl radicals (˙OH) by Fe(III) in Fe–Ni/SiO2via the photo-Fenton reactions. Furthermore, we determined that the catalyst activity can be replicated in successive experiments without a significant decline in the Fe–Ni/SiO2 and H2O2 processing efficiency under light irradiation. Our results will be useful for future improvement of active heterogeneous photo-Fenton catalysts for developing organic dye-containing wastewater treatments.
✓ 已验证
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2021
·Vol. 62
·期 2
·576-585
·
IF 2.428
Yang Liu,Tingting Liu,Xiangchi Liu,Baijun Liu,MingYao Zhang
In this research, monodispersed polystyrene (PS) microspheres were prepared by dispersion polymerization. PS microspheres decorated with silver nanoparticles (PS/Ag composite microspheres) were synthesized by a modified chemical plating method with water as the synthesis medium. The microspheres at each stage were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), UV–visible spectroscopy (UV–vis), field-emission scanning electron microscopy (FESEM), and energy-dispersive spectrometer (EDS). The reduction of methylene blue (MB) was carried out with PS/Ag composite microspheres as a catalyst and NaBH 4 as a reducing agent. The results showed that the MB dye was reduced to colorless within 180 s. The reduction of the MB dye followed pseudo-first-order kinetics with an apparent rate constant (K app ) value of 0.01425 s −1 . Control experiments were also carried out by adding microspheres from each chemical plating pretreatment stage to the MB, without PS/Ag composite microspheres. The catalytic activity of the PS/Ag composite microspheres was high after five consecutive cycles of recovery, showing promising reusability. The catalytic activity of the prepared PS/Ag catalysts was superior to other catalysts for the reduction of MB.
✓ 已验证
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2025
·
IF 2.3
Han Yuxuan,Yuan Yizhong,Sun Jinyu,Tian Xiaohui,Yu Huimei
The treatment of dye wastewater necessitates efficient and sustainable adsorbents. In this study, a novel sodium alginate/carrageenan/montmorillonite@carboxymethyl cellulose nanofiber (SA/CRG/MMt@CMCNF) core-shell hydrogel, containing abundant adsorption sites, was synthesized via a facile ion-crosslinking method for effective methylene blue (MB) removal. The surface characteristics including morphology, functional groups, and pore distribution of the SA/CRG/MMt@CMCNF hydrogel were analyzed. FTIR, BET, and XPS analyses revealed that the addition of MMt provided more adsorption sites. The composite hydrogel exhibited a maximum adsorption capacity of 228.83 mg·g − 1 under optimal conditions and was well-described by both the pseudo-second-order kinetic model and Langmuir isotherm model. Furthermore, it maintained 75% MB removal efficiency after five adsorption cycles. To our knowledge, this study introduces the first incorporation of CMCNF and MMt into the SA/CRG composite system to form a core-shell hydrogel for MB adsorption. Overall, the SA/CRG/MMt@CMCNF hydrogel offers several advantages, including a simple production process, low cost, high adsorption capacity, and good recyclability. This research presents a design strategy for multifunctional hydrogel composites incorporating nanomaterials, providing novel insights into the development of dye treatment technologies. Graphical abstract
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Yukun Hu,Min Wang,Longyu Tian,Guangming Liao,Zaijun Lu
The novel cross-linked copolymer (BPSU-C4A-SPS) was synthesized by the copolymerization of benzoxazine-functionalized polysulfone (BPSU), calix[4]arene (C4A), and sodium 4-hydroxybenzenesulfonate (SPS). The material exhibited high thermal stability with a glass transition temperature ( T g ) of 285°C and a 5% weight loss temperature ( T d5 ) of 347°C, and enhanced hydrophilicity with a water contact angle of 76.5°. Moreover, adsorption studies on MB demonstrated that BPSU-C4A-SPS possesses a higher adsorption capacity than the benzoxazine-functionalized polysulfone homopolymer (BPSU-a) and the benzoxazine-functionalized polysulfone-calix[4]arene copolymer (BPSU-C4A). Adsorption followed the Freundlich isotherm and pseudo-second-order kinetics best describes the adsorption process of BPSU-C4A-SPS to MB, indicating multilayer chemisorption driven by electrostatic interactions and π-π stacking. This work provides a scalable strategy for designing stable adsorbents with synergistic effects, suitable for industrial wastewater treatment.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xinyuan Fu,Jingke Liu,Xiaodong Zhang,Yao Liu,Ting Wu,Xiaoqing Lin
This study evaluated the ability of triethyl benzyl ammonium chloride/lactic acid deep eutectic solvent extracted lignin (TEBAC/LA-DES-L) to adsorb methylene blue (MB) without additional functional group modification. The structure and morphology of TEBAC/LA-DES-L were characterized using SEM, BET, FT-IR, and TGA techniques. Various factors influencing MB adsorption, such as extraction temperature, solution pH, adsorbent dose, initial MB concentration, adsorption time, and reaction temperature, were investigated. The Redlich-Peterson isotherm displayed a good fit for the experimental data, with a maximum adsorption capacity of 85.16 mg/g. Kinetic analysis suggested that the adsorption process followed the pseudo-second-order model, with adsorption occurring in <100 min on DES-L-4 h. The mechanism of MB adsorption on DES-L-4 h was attributed to electrostatic attraction, hydrophobic interactions, and hydrogen bonding forces. Overall, DES-L-4 h demonstrated high adsorption capacity and rapid adsorption rate, making it a promising adsorbent for effectively removing cationic dyes from wastewater.
✓ 已验证
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 5
·1-9
·
IF 5.3
Li Rui,Que Wenzhong,Han Haiyan,Shi Honghui,Wang Rongfeng,Qiu Bin
IL-17 (interleukin-17) is a common proinflammatory cytokine and can be adopted as an important biomarker for several diseases; it is thus very necessary to design an effective method for monitoring IL-17. Herein, by preparing silver nanoparticles/graphdiyne (Ag/GDY) with simple electroless deposition as the sensing platform and methylene blue/UiO-66-NH 2 MOFs (MB/MOFs) as the signaling-amplifier, a highly efficient sandwich-like electrochemical immunosensing (SLEI) platform was designed for IL-17 detection. The superior electrical property, easy preparation, large surface area, and high stability of Ag/GDY make it a desirable substrate to immobilize primary antibody of IL-17. Meanwhile, the unique structure of UiO-66-NH 2 is beneficial to immobilize MB probe and secondary antibody. By optimizing experimental conditions, the MB current obtained at the as-designed SLEI platform increases along with IL-17 increase, and the related linearity is 1.0 pg mL −1 –1.0 ng mL −1 coupled with a low detection limit of 0.3 pg mL −1 . It is expected that the SLEI platform based on Ag/GDY and MB/MOFs shows some potential application for IL-17 detection. Graphical abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Peixun Zhai,Haibo Liu,Fuwei Sun,Tianhu Chen,Xuehua Zou,Hanlin Wang,Ziyang Chu,Can Wang,Meng Liu,Dong Chen
As a natural and environmentally friendly adsorbent, palygorskite (Pal) has been approved to be excellent for the adsorption of dyes . However, the spent Pal is difficult to be regenerated through normal desorption methods, and thus, becoming a solid waste. In this study, methylene blue (MB) was adsorbed by Pal, and the MB absorbed on palygorskite (MP) was carbonized at different temperatures. The carbonized MP (CMP) was used for peroxydisulfate (PDS) activation to degrade bisphenol A (BPA). The effects of carbonization temperature, pH values, PDS concentration, and catalysts dosage on BPA degradation were investigated. The results show that the MP carbonized at 800 °C (CMP800) has the best activation performance due to the high degree of carbon defectivity and high specific surface area. The CMP800 can effectively degrade BPA over a wide pH range from 3 to 9 and is extremely resistant to the effects of various anions, such as Cl − , NO 3 − , HCO 3 − , and H 2 PO 4 − . Based on quenching experiments, electron spin resonance (ESR), and electrochemical analysis results, a non-radical pathway involving electron transfer from BPA to PDS is responsible for the degradation of pollutants. Moreover, the CMP800 has a high total organic carbon (TOC) removal efficiency of 83%, high stability in three cycles, and low PDS consumption. This study demonstrates the feasibility of the treatment and utilization of the waste Pal, which also provides a carbon-based activator for the activation of PDS to degrade organic contaminants .
✓ 已验证
DOI
高影响因子
Advanced Sustainable Systems
·
2021
·Vol. 6
·期 3
·2100329
·
IF 6.271
Yang Zhang,Yu Chen,Yue Jiang,Guoxin Sui
3D printing of biomass has attracted increasing attention and can meet the requirements of various practical applications. Herein, 3D printing of a cellulose-based aerogel is achieved by direct ink writing based on a self-thickening and self-strengthening strategy, followed by freezing drying. The magnetic cellulose-based aerogels (MCAs) containing Fe 3 O 4 nanoparticles are ideal adsorbents for adsorbing and removing organic pollutants from water. As catchers and carriers for magnetic removal, MCAs (Fe 3 O 4 nanoparticles and cellulose) provide large active sites, which allows organic pollution to be quickly and stably bound on the surface. The adsorption effect of methylene blue (MB) is dependent on pH and the removal efficiency of MB (5.6 mg l -1 , pH = 9) is 88.5% for MCA, which occurs almost instantaneously at room temperature. In addition, the collected aerogel-MB hybrid can be reactivated by acid-washing (pH = 3) without obvious changes in the adsorption performance of MCA. The MCA exhibits a fast, efficient and sustainable removal of organic pollutants, which provides an inexpensive and recyclable method for water remediation.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）