INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Hongxing Shi,Chengya Dong,Yuanyuan Yang,Yuanrui Han,Fei Wang,Chaoxian Wang,Jiying Men
Dyes bring a lot of benefits to our lives, however, as common organic pollutants , they have destructive influences on the environment. Firstly, glutaraldehyde crosslinked chitosan microspheres (GCS) are prepared via inverse-phase suspension polymerization . Then, GCS microspheres are acted as the base material, ammonium persulfate (Aps) as the initiator, sodium styrene sulfonate (SSS) as anionic functional monomer, functional microspheres (GCS-g-PSSS) are prepared by surface grafting polymerization. The amount of monomer and Aps, temperature and reaction time is respectively explored. The chemical structures and physicochemical properties of functional microspheres were characterized by FT-IR, zeta potential , scanning electron microscope and X-ray photoelectron spectroscopy. The adsorption kinetic at different temperature and initial concentration is studied and fitted. The adsorption isotherms of GCS-g-PSSS for MB are explored at different pH, temperature and salinity. The adsorption capacity of GCS-g-PSSS for MB is 820.1 mg/g at 318 K. The adsorption isotherms at different temperature are fitted by Langmuir, Freundlich, Dubinin-Radushkevich and Temkin. Thermodynamic parameters imply that adsorption is a spontaneous and endothermic process. And this adsorbent has good reusability. The adsorption ability of GCS-g-PSSS microspheres is also excellent for other cationic dyes. Thus, GCS-g-PSSS microspheres might serve as a promising adsorbent for contaminated water scavenging.
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Dan Li,Heng Liu,Wei Peng,Feigao Xu
In this study, reduced graphene oxide (RGO) was prepared separately by hydrothermal and chemical reduction methods. The catalytic activity of RGO with hydrothermal and the chemical methods was investigated when they were applied in the degradation of methylene blue (MB) under visible light. The results show that the catalytic activity of RGO with the chemical method was negligible, whereas that of RGO with the hydrothermal method was significant but unstable. The addition of 2 mmol L –1 inorganic ions (HCO3 - , HPO4 2- , NO3 - , SO 4 2- , Al 3+ , Mg 2+ , Na + , Ca 2+ , and NH4+) and humic acid (HA) into RGO with the hydrothermal method affected the degradation of MB. The photodegradation efficiency of MB was improved by the addition of HCO3 - or HPO4 2- , whereas NO3 - , SO 4 2- , Al 3+ , Mg 2+ , Na + , Ca 2+ , and NH4+ inhibited photodegradation of MB. Moreover, the addition of HA was proven to inhibit the degradation of MB by RGO via the hydrothermal method.
研究领域:
环境化学
·
材料科学
·
光催化
·
水污染控制
·
纳米材料
✓ 已验证
DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2024
·Vol. 235
·期 2
·1-15
·
IF 3.8
Zhang Lan,Huang Wei,Dong Xiang,Zhao Yan,Li Fang-fang,Cen Qi-hong
The hierarchical zeolite (ZC) was synthesized by using electrospinning cellulose microfibers (ECM) with three-dimensional network structure as a hard template. The textual and structural properties of the prepared materials were characterized by powder X-ray diffraction patterns (XRD), nitrogen adsorption–desorption analysis, scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and TG-DSC. In terms of adsorption properties, the performance was examined by adsorption of methylene blue (MB) on the conventional zeolite (ZA) and ZC. The results showed that ECM templating could significantly increase the mesoporous area and volume of the traditional microporous zeolite, and thus improve the mass transfer performance and adsorption capacity. ZC exhibited much faster and higher MB removal performance than the traditional zeolite with adsorption rate constant and maximum adsorption capacity of ZC approximately 20 and 1.2 times greater than that of ZA. Besides, ZC exhibited better resistance to interfering ions than ZA. Moreover, ZC could be conveniently regenerated by washing with NaCl and the MB adsorption capacity was almost constant in five cycles of the regeneration. These features enable ZC to be an effective and promising adsorbent to remove MB from water.
研究领域:
材料科学
·
环境工程
·
纳米技术
·
化学工程
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2026
·Vol. 11
·期 13
·e06882
·
IF 2.3
Yu-Ping Zhang,Chang-Hua Zhao,Hong-Li Dou,Pei Yuan
Ultrasonic- and microwave-assisted methods are progressive techniques used in synthesizing nanocomposites on different inorganic, organic, or hybrid supports. In this study, one-step synthesis of Fe 3 O 4 @TiO 2 (FT) core-shell nanoparticles was conducted by combining ultrasound- and microwave-assisted solvothermal methods. The composites were fabricated using a central magnetic Fe 3 O 4 core, with in situ formation of the outer TiO 2 coating. The surface of FT was further modified via polydopamine(PDA), and the as-prepared Fe 3 O 4 @TiO 2 @PDA composites (FTP) were successfully used as photocatalysts to effectively remove methylene blue (MB) in an aqueous solution. The pH, photocatalyst dosage, initial MB concentration, and temperature influences were investigated under 254 nm UV light. Additionally, the changes in the physicochemical properties of the nanocomposites were analyzed using transmission and scanning electron microscopy, Fourier transform infrared spectroscopy, x-ray powder diffraction, and vibrating sample magnetometry. The as-prepared FTP composites exhibited excellent efficiencies (99.9%) in the adsorption and photocatalytic degradation of 20 ppm MB in neutral or basic conditions over 30 min. Compared with previous reports about Fe 3 O 4 @TiO 2 composites, the modified PDA layer enriched MB molecules via hydrogen bonds and strong electrostatic interactions, and simultaneously trapped photogenerated electrons of TiO 2 to inhibit carrier recombination with an apparent reaction rate constant of 0.0816 min − 1 . Therefore, the use of ultrasonic and microwave co-irradiation in rapidly preparing magnetic composites is simple and viable.
✓ 已验证
DOI
高影响因子
Materials Chemistry Frontiers
·
2026
·
IF 8.1
Xuetong Cai,Chi Meng,Yajie Zhang,Fude Feng
Artificial NADH oxidase (NOX) has distinct advantages in cost, stability and manufacture as compared to the natural oxidases. Methylene blue is a redox-active phenothiazine derivative with weak NOX-like activity in mediating electron transfer. Herein, we applied a one-pot iron-catalyzed oxidative polymerization method to prepare a methylene blue backboned polymer (MBPN-10) with pendant quaternary ammonium groups and compared with methylene blue in the catalytic activity of NADH oxidation. MBPN-10 showed increased NADH binding affinity, improved catalytic performance, and was compatible with long-term on-shelf storage and organic solvents. The catalytic reaction by MBPN-10 is efficient to afford H2O2 without the need of metals or light. These features make MBPN-10 a highly promising synthetic NOX mimic.
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2013
·
IF 3.479
Li Zhou,Jiachang Huang,Benzhao He,Faai Zhang,Huabin Li
This study investigated the potential use of natural peach gum (PG) as alternative adsorbent for the removal of dyes from aqueous solutions. The PG showed high adsorption capacities and selectivity for cationic dyes (e.g., methylene blue (MB) and methyl violet (MV)) in the pH range 6–10. 98% of MB and MV could be adsorbed within 5 min, and both of the adsorptions reached equilibrium within 30 min. The dye uptake process followed the pseudo-second-order kinetic model. The intraparticle diffusion was not the sole rate controlling step. Equilibrium adsorption isotherm data indicated a good fit to the Langmuir isotherm model. Regeneration study revealed that PG could be well regenerated in acid solution. The recovered PG still exhibited high adsorption capacity even after five cycles of desorption–adsorption. On the basis of its excellent adsorption performance and facile availability, PG can be employed as an efficient low cost adsorbent for environmental cleanup.
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Rong Ping Chen,Lei Yu,Cao Xing Huang,Chen Huan Lai,Ting Ting Ma,Zi Shuai Zhang,Qiang Yong
Magnetic humic acid nanoparticles (MHA) was prepared via coprecipitation method. Adsorptive removal of methylene blue (MB) and Cu(II) by MHA in single-component and binary systems was studied, respectively. MHA showed highly removal efficiency to MB and Cu(II). The adsorptions of MB and Cu(II) on MHA were pH dependent with uptake dropping in acidic solutions. The adsorption mechanisms of MB and Cu(II) were also different. MB is adsorbed via two mechanisms: π–π interactions and ion exchanging, while Cu(II) only involves ion exchanging. It was also proved that MHA can selectively remove MB in acidic solutions. The adsorption equilibrium and kinetic study indicated that the adsorption of MHA was in agreement with Langmuir model and pseundo-second-order model, respectively. Furthermore, MHA could be easily regenerated and reused with almost no loss of adsorption capacity. Overall, MHA is an efficient and versatile adsorbent for Cu(II) and MB.
研究领域:
环境科学
·
材料化学
·
水处理
·
吸附技术
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Jiamei Zhao,Xinyue Cao,Yibo Bai,Jie Chen,Conglu Zhang
Calcium titanate (CaTiO 3 ) has received more and more attention due to the excellent physicochemical properties. However, in the process of photocatalysis , the photogenerated carriers are very easy to recombine. Based on this problem, g-C 3 N 4 modified CaTiO 3 photocatalyst was prepared via calcination . The properties of CaTiO 3 /g-C 3 N 4 were analyzed through XRD , SEM , XPS , UV–vis and TGA . The optimized CaTiO 3 /g-C 3 N 4 could achieve 100% and 87.7% removal rate of methylene blue (MB) and levofloxacin (LVF), respectively, under a 500 W mercury lamp illumination within 120 min. In addition, the effects of photocatalyst dosage, solution pH and co-existing ions in water on the degradation process were systematically investigated. A possible charge transmission mechanism was analyzed and the LVF degradation pathway was proposed. This work will provide a new strategy to synthesize cost-effective CaTiO 3 composites.
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Yaohui Sun,Yanhui Li,Bing Chen,Mingzhen Wang,Yang Zhang,Kewei Chen,Qiuju Du,Yuqi Wang,Xinxin Pi
It can be difficult to remove dark methylene blue (MB) from water effectively. The use of sodium alginate and bentonite (Ben) as the matrix produced a displacement reaction that occurred in cobalt chloride, which allowed Ben to be successfully encapsulated in cobalt alginate (CA). Finally, a vacuum freeze-drying method was used to prepare a low-cost composite of CA/Ben aerogel for adsorbing MB in aqueous solutions. In addition to scanning electron microscopy, thermogravimetric analysis, and Fourier transform infrared spectroscopy, the composites were also characterized and analyzed. Different adsorption experiments were conducted in order to determine the effects of dosage, pH, adsorption time, and temperature on the adsorption performance of the adsorbent. According to the results of the experiment, the adsorption capacity of CA/Ben aerogel was 258.92 mg·g–1, and the pseudo-first-order kinetic model and Freundlich isotherm model can fully explain the adsorption process of MB on this aerogel. The composite material reported in this paper is easily recycled, and the removal rate reaches 65% after four times of recycling. Moreover, compared with other adsorbents, the composite material of the invention is highly environmentally friendly and has a simple preparation process. A large-scale application of this technology is the removal of dyes from water on a large scale.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 7
·3161-3180
·
IF 3.3
Liu Wenyi,Sun Dedong,Ma Hongchao,Ma Chun,Zhang Xinxin,Hao Jun
In the present work, a novel CeO 2 /ZIF-9 composites were prepared, characterized and used as a multiphase catalyst to activate peroxymonosulfate (PMS) to degrade methylene blue (MB). The effects of Ce/Co molar ratio, catalyst dose, PMS concentration, initial solution pH and reaction temperature were explored. The results showed that 20 mg/L MB was almost absolutely degraded, and the removal rate of COD reached 77.8% by 150 mg/L PMS activated with 50 mg/L 0.50-CeO 2 /ZIF-9 within 30 min at room temperature (20 °C) and initial pH 6.4. The active species such as SO 4 •− , 1 O 2 and • OH performed important roles in the catalytic process, as evidenced by quenching experiment and electron paramagnetic resonance (EPR) analysis. The synergistic catalytic mechanism of 0.50-CeO 2 /ZIF-9 in the heterogeneous activation of PMS was proposed, which mainly involves the enhanced redox cycle of Co 3+ /Co 2+ by Ce 3+ donated electrons. Recycling experiments suggested that the removal efficiency of MB can still reach 92.9% after four catalytic cycles, indicating good reusability of 0.50-CeO 2 /ZIF-9 catalyst. Therefore, because of its easy preparation, superior catalytic performance and reusability, the 0.50-CeO 2 /ZIF-9 composite catalyst has promising applications in water treatment.
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xiaoli Zhang,Penghui Shi,Wenbin Zhao,Wu Lu,Feng Li,Yulin Min,Qunjie Xu
Advanced oxidation processes (AOPs) focusing on non-thermal plasma induced by dielectric barrier discharge (DBD) are adequate sources of diverse reactive oxygen species beneficial for water and wastewater treatment. The degradation of methylene blue (MB) was investigated using plasma liquid dielectric barrier discharge with a multineedle-to-plane reactor. MB at 20 mg/L concentration was almost completely degraded after 40 min of treatment. In this study, several important parameters, such as input voltage, initial concentration, initial pH, discharge gap, tip radius of curvature, and presence of radical, were evaluated, and their effects on MB degradation rate were investigated. The degradation rate of MB increased with initial pH. By contrast, the degradation rate showed a downward trend with increasing initial concentration, discharge distance, and tip curvature radius. O 3 and H 2 O 2 produced during the degradation process considerably influenced the entire degradation process, especially when the quenching agents of HO ⋅ , O 2 · - and e − were added, and the degradation efficiency was obviously reduced. According to the measured spectrum, the possible process of the discharge process was analyzed, and the COMSOL finite element simulation is performed to obtain the visualization of the discharge model. This work can provide exploratory platforms for comprehensively understanding and enhancing MB degradation in DBD plasma technology.
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Yinghui Wang,C. Srinivasakannan,Huihao Wang,Gang Xue,Li Wang,Xin Wang,Xinhui Duan
Biochar containing graphene (BCG) was synthesized using the precursor of bamboo biomass and K 2 CO 3 as the activating agent utilizing microwave heating with short duration. The biochar had a typical graphene structure with abundant micropore and extremely high surface area up to 1565 m 2 /g. The activating agent K 2 CO 3 played an important role in the catalytic graphitization , facilitating transformation of amorphous carbon into graphene like carbon. The adsorption experiment exhibited an excellent adsorption capacity of BCG for methylene blue (MB), with a maximum adsorption capacity of 1100 mg/g. The adsorption process was governed both by physical and chemical adsorption . The work further presents the mechanism of activation, adsorption isotherms , adsorption kinetics , adsorption thermodynamics. The experimental resulted proved the successful and fast preparation methodology for graphene contained carbon materials by microwave heating.
✓ 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）