DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 30
·10472-10480
·
IF 4
Pingping Teng,Ying Liu,Zhongqiao Sun,Hao Meng,Yide Han,Xia Zhang
Development of binary MOF-on-MOF heterostructures is a research hotspot in MOFs chemistry due to the advantages elicited by a closely connected interface, which may endow more abundant functionality and even broader applications in interface chemistry. A MOF-on-MOF heterostructure was constructed by in situ growth of MIL-88B on the outer surface of UiO-66. The resultant MIL-88B@UiO-66 produced had an interesting flower-like morphology composed of MIL-88B (petal) on tetrahedral UiO-66 (core). The MIL-88B@UiO-66 heterostructure showed adsorption and Fenton-like oxidation abilities, with distinctly improved structural stability in aqueous solution compared with that of single MIL-88B. Methylene blue (MB) was selected as the target molecule to evaluate the adsorption and Fenton-like oxidation activities. The efficiency of total removal of MB was studied systematically under various operating conditions and the influencing factors were optimized. The kinetics of adsorption and catalytic oxidation were simulated to explore the interactions between MB and MIL-88B@UiO-66. The mechanisms of enhanced adsorption and Fenton-like oxidation were suggested. The cyclic removal performance and structural stability of MIL-88B@UiO-66 were also determined.
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Polymers
·
2023
·Vol. 15
·期 10
·2342
·
IF 5
Xiuzhi Bai,Zhongxiang Liu,Pengfei Liu,Yijun Zhang,Linfeng Hu,Tongchao Su
In this work, a novel composite of bacterial cellulose (BC) and expanded vermiculite (EVMT) composite was used to adsorb dyes and antibiotics. The pure BC and BC/EVMT composite were characterized using SEM, FTIR, XRD, XPS and TGA. The BC/EVMT composite exhibited a microporous structure, providing abundant adsorption sites for target pollutants. The adsorption performance of the BC/EVMT composite was investigated for the removal of methylene blue (MB) and sulfanilamide (SA) from an aqueous solution. The adsorption capacity of BC/ENVMT for MB increased with increasing pH, while the adsorption capacity for SA decreased with increasing pH. The equilibrium data were analyzed using the Langmuir and Freundlich isotherms. As a result, the adsorption of MB and SA by the BC/EVMT composite was found to follow the Langmuir isotherm well, indicating a monolayer adsorption process on a homogeneous surface. The maximum adsorption capacity of the BC/EVMT composite was found to be 92.16 mg/g for MB and 71.53 mg/g for SA, respectively. The adsorption kinetics of both MB and SA on the BC/EVMT composite showed significant characteristics of a pseudo-second-order model. Considering the low cost and high efficiency of BC/EVMT, it is expected to be a promising adsorbent for the removal of dyes and antibiotics from wastewater. Thus, it can serve as a valuable tool in sewage treatment to improve water quality and reduce environmental pollution.Keywords:bacterial cellulose;vermiculite;biopolymers;water treatment;dye and antibiotic removal
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DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Sile Liu,Yifu Bu,Song Cheng,Rongrong Tao
TiO 2 /g-C 3 N 5 heterojunction is synthesized by the simple method, which is used in photocatalytic degradation methylene blue (MB) under visible light irradiation. The characterization analysis indicates that TiO 2 /g-C 3 N 5 has good crystallinity , and the heterojunction between TiO 2 and g-C 3 N 5 is formed with good MB photocatalytic degradation performance . The MB photocatalytic degradation removal of the TiO 2 /g-C 3 N 5 is 97.4 % at the concentration of 20 mg/L, which is significantly improved compared to the TiO 2 and g-C 3 N 5 . The visible light adsorption ability and the separation of photogenerated carriers of the TiO 2 /g-C 3 N 5 are improved, which is beneficial to the MB photocatalytic degradation. TiO 2 /g-C 3 N 5 has good reusability with 95.8 % of the initial removal after 5 cycles. The capture experiment and electron paramagnetic resonance spectroscopy analysis indicate that the existence of the h + , O 2 − and OH involves in MB photocatalytic degradation process . MB photocatalytic mechanism of the TiO 2 /g-C 3 N 5 is consistent with the direct Z scheme mechanism based on the band gap structure calculations.
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ANALYTICAL BIOCHEMISTRY
·
2023
·
IF 2.9
Xin-Lei Cheng,Ting-Rui Fu,Dan-Feng Zhang,Jian-Hua Xiong,Wu-Ying Yang,Juan Du
Reduced graphene oxide-gold nanoparticles nanocomposites (rGO-AuNPs) with high surface-enhanced Raman scattering (SERS) activity was created by biomass-assisted green synthesis with Lilium casa blanca petals biomass for the first time, and its application for methylene blue (MB) degradation was explored through in-situ monitoring. Lilium casa blanca petals biomass was used as a reducing agent to reduce GO and chloroauric acid successively when carrying out rGO-AuNPs in-situ synthesis while it also acted as a capping agent. The produced rGO had oxygen-containing functional groups which had an outstanding performance in enhancing the SERS effect. Characterization results confirmed that the AuNPs were grafted onto the rGO sheet, and the mechanism study showed that total flavonoids in Lilium casa blanca petals biomass were the main biological compounds involved in the reduction. rGO-AuNPs had a high Raman enhancement factor (EF) which could reach 3.88 × 10 7 . The synthesized nanocomposite also had a good catalytic activity that could be employed as catalyst in MB degradation, and it could complete degradation within 15min. The reaction rate increased linearly with the amount of rGO-AuNPs, and the degradation could be in-situ monitored both by UV and SERS.
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Materials Today Communications
·
2023
·
IF 3.8
Cheng Hu,Lianhong Zhang,Qin Ye,Qiang Li
The ability of photocatalysts to combat environmental pollution can be effectively improved by defect modulation. This paper developed a donor-acceptor (D-A) precursor system using urea as the hydrogen bond donor and cyanoacetic acid as the hydrogen bond acceptor to successfully synthesize modified g-C 3 N 4 (CA-CNx). The results showed that while cyanoacetic acid addition contributed to the formation of N defects in g-C 3 N 4 , but cyanoacetic acid overuse caused structural disorder in CA-CNx. A decrease in the g-C 3 N 4 band gap and an improvement in the photogenerated carrier mobilities due to the inclusion of N defects may lead to more effective usage of visible light. The highest catalytic activity for methylene blue (MB) solution (40 mg/L) was demonstrated by the modified g-C 3 N 4 synthesized by adding 0.4 g cyanoacetic acid, and the degradation rate of the MB solution reached 90.4 % within 100 min. The proposed primary kinetic constant was 6.91 times higher than the original g-C 3 N 4 . According to free radical scavenging tests, superoxide radicals are the predominant active species during the catalytic breakdown of MB processes. This method provides a novel idea to producing g-C 3 N 4 with N-defects and the opportunity to comprehend the impact of structural defects in enhancing semiconductor photocatalytic activity.
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ChemNanoMat
·
2019
·Vol. 5
·期 6
·802-813
·
IF 3.431
Xin Zhao,Qing-Da An,Shu-Feng Bo,Dong-Mei Guo,Zuo-Yi Xiao,Shang-Ru Zhai,Zhong-Cheng Li
Graphical Hierarchical Co/N-co-doped carbonaceous beads with diffusion-promoting nanostructures were prepared for organic pollutant degradation. Fixed-bed column degradation experiments were carried out to evaluate the dynamic degradation and potential industrial applications with various simulated real conditions. Additionally, SA/N−Co x O y catalyst was prepared with waste cobalt solution, with the goal of recycling waste ion solutions. Un-restricted diffusion channels for ions and molecules within catalytic composites is of practical significance for environmental remediation with aqueous reaction systems. Herein, hierarchical Co/N-co-doped carbonaceous beads with diffusion-promoting nanostructures for activating peroxymonosulfate (PMS) were prepared through a seaweed-based hydrogel strategy. Several technologies were applied to characterize resultant samples including XRD, SEM, TEM, XPS and N 2 adsorption-desorption. The degradation was carefully tested in simulations of real conditions such as in running water, laboratory waste liquid, and seawater, which indicated that the catalyst/PMS system has a practical and a wide range of degradation capacity. Moreover, SA/N−Co x O y could also prepared with waste cobalt solution, and also showed relatively good catalytic performance. In contrast to other works which mostly concentrated on the study of static testing, this research is mainly concerned with dynamic degradation. Batch and fixed-bed column degradation experiments were simultaneously carried out to evaluate the efficiency and potential industrial applications, which revealed that the as-prepared sample led to the fast removal of 90.26% of MB within 400 minutes and continuously degraded the dye for 25 h at 298 K. The recycling performance was also investigated by means of dynamic degradation tests, which only showed a slight decline with time.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Shaokun Wang,Xiaofei Ma,Pengwu Zheng
Cellulose/graphene oxide (CG) porous composites with 3D network structure were prepared via a solution mixing-regeneration and freeze-drying process. The CG aerogels were functionalized with 1,4-butane sultone under mild reaction conditions to achieve sulfated composite aerogels (SCGs), in which the sulfo groups were simultaneously introduced onto GO and cellulose components. The adsorption ability of SCG aerogel was greatly enhanced compared with CG aerogels. The fitting results of adsorption models suggested the monolayer adsorption and chemisorptive characteristics with the maximal uptake capacity as high as 421.9 mg/g for methylene blue (MB) and 163.4 mg/g for tetracycline (TC). The adsorption mechanism was also studied in detail. For the simulated wastewater containing MB and TC, the novel SCG adsorbent exhibited a removal efficiency of 99%. Furthermore, its adsorption capacity was not apparently deteriorated after seven cycles for MB and ten cycles for TC while the original structural integrity was almost maintained. Herein, this recyclable and reusable adsorbent exhibited the potential application on the removal of MB and TC from water.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Liaojing Huang,Liu Yang,ChuanChao Zhu,Hanmei Deng,Guangpeng Liu,Yali Yuan
It is of great significance to explore reliable and sensitive methods for the trace detection of lead ions (Pb 2+ ), which may cause serious adverse effect to human health. Herein, we proposed a methylene blue (MB) sensitized signal-on photoelectrochemical (PEC) biosensor with 3,4,9,10-perylene tetracarboxylic acid (PTCA) film as photoelectric material for highly sensitive Pb 2+ detection. First, PTCA was modified on the electrode surface, manifesting wonderful film-forming property and acquiring a satisfactory initial PEC signal. Afterward, Pb 2+ -dependent DNAzyme modified on electrode was cleaved by target Pb 2+ , followed by hybridizing MB assembled 3D DNA networks with the exposed Pb 2+ catalytic strand. Significantly, in the presence of sensitizer MB, the PEC signal of PTCA was extraordinarily increased and the designed biosensor performed a high sensitivity with a detection limit down to 0.03 pM. Therefore, with enzyme-free assembly of MB embedded 3D DNA networks, this dye-sensitized strategy exhibited effective and uncomplicated amplification technology for Pb 2+ detection.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2018
·
IF 4.005
Zishun Li,Xuekun Tang,Kun Liu,Jing Huang,Qian Peng,Minlin Ao,Zhiqiang Huang
An adsorbent, which is easy to be separated and reused after adsorption, is very important for the removal of pollutants in aqueous solution. Hence, a novel nanofibrous sandwich structured adsorbent of silica nanofiber/magnetite nanoparticles/porous silica (SNF/MNP/PS) was designed and synthesized for the first time. The magnetite nanoparticles with diameter less than 10 nm were evenly distributed on the surface of silica nanofiber, which was subsequently fully covered by a layer of porous silica. The novel adsorbent was proved possessing good adsorption capacity for both methylene blue (MB) and Pb (II) ion (Pb 2+ ), and the adsorption equilibrium could be well described by the Langmuir-isotherm model with the maximum adsorption capacity of 103.1 mg/g for MB and 243.9 mg/g for Pb 2+ at 288 K. Moreover, in MB-Pb 2+ mixed system the measured adsorption capacity reached 74.5 mg/g for MB and 202.4 mg/g for Pb 2+ , respectively. The saturated adsorbent could be readily magnetically separated from the solution and then efficiently regenerated by heterogeneous Fenton-like reaction (for MB) or acidic desorption process (for Pb 2+ ), respectively. After 5 cycles of adsorption-regeneration, the adsorption capacity of the reused adsorbent still reached 81.0% (for MB) and 70.9% (for Pb 2+ ) of the initial value. The SNF/MNP/PS behaves good adsorption properties for different types of pollutants, high magnetic recoverability and regeneration efficiency, which make it applicable to different contaminants removal .
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ACS Omega
·
2018
·
IF 0
Tao Hu,Qinze Liu,Tingting Gao,Kaijie Dong,Gang Wei,Jinshui Yao
A novel hydrogel bead [tannic acid (TA)–poly(vinyl alcohol) (PVA)/sodium alginate (SA)] with high strength prepared by biocompatible PVA, TA, and biocompatible SA via an instantaneous gelation method was applied to remove methylene blue (MB) from aqueous solution. The obtained TA–PVA/SA hydrogel beads were fully characterized by thermogravimetric analysis, Fourier-transform infrared spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy, and so on. The adsorption performances of TA–PVA/SA hydrogel beads for MB were investigated by changing the factors of TA content, initial concentration, pH, adsorbent dosage, contact time, and temperature systematically. The maximum capacity of TA–PVA/SA hydrogel beads for MB removal was obtained to be 147.06 mg/g at 30 °C, whose capability was better than that without TA. After fitting the adsorbed data, it was basically consistent with the Langmuir isotherm and pseudo-second-order kinetic model. Thermodynamic studies indicated that MB removal was spontaneous and exothermic in nature. It is concluded that the low-cost TA–PVA/SA hydrogel beads as an easily recoverable adsorbent have a great potential on the removal of hazardous dyes from wastewater.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Ying Liu,Shaobin Huang,Xuesong Zhao,Yongqing Zhang
A three-dimensional porous β-cyclodextrin/chitosan functionalized graphene oxide hydrogel (3D-GO/CS/β-CD) was synthesized by a simple and facile chemical reduction method in the presence of sodium ascorbate which acted as a reducing agent, and its application as an adsorbent for MB removal was investigated. The unique 3D structure enabled the rapid reuse and recyclability of 3D-GO/CS/β-CD without a complicated filtration system. The adsorbent was characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy , X-ray diffraction (XRD), thermogravimetric analysis (TGA) and Brunauer–Emmett–Teller (BET) analysis, and the results of the characterization indicated the successful synthesis of 3D-GO/CS/β-CD. The 3D-GO/CS/β-CD showed an ultrahigh adsorption capacity (1134 mg/g) for MB . The investigation of the adsorption behavior demonstrated that the adsorption was well fitted with the pseudo-second-order model and Freundlich model. The simulation of the intra-particle diffusion model illustrated that both film diffusion and intraparticle diffusion were involved in the adsorption process . The thermodynamics analysis suggested that the adsorption process of MB onto 3D-GO/CS/β-CD was spontaneous and endothermic. Furthermore, the regeneration study showed that the 3D-GO/CS/β-CD can be reused in the wastewater treatment application. All these findings demonstrated that the 3D-GO/CS/β-CD could be a cost-effective and promising adsorbent for MB removal from the aqueous solution.
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INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Xianmiao Pan,Na Zhao,Hu Shi,He Wang,Fangtao Ruan,Hongjie Wang,Quan Feng
Removing textile dye by activated carbon adsorption from wastewater has become a focus issue owing to its easy operation, rapid adsorption ability, and relatively high removal efficiency. Biomass-based activated carbon is an excellent candidate due to its renewability and easy accessibility, but the biomass resources like peel and stem are usually with relatively long growth cycle and the removal efficiency within a wide pH range is relatively low. Thus, a biomass carbon source with a short growth cycle and activated carbon with high removal efficiency within a wide pH value needs to be explored. In this study, golden needle mushroom root-based activated carbon (GNMACs) activated by H 3 PO 4 was successfully prepared, characterized, and applied in methylene blue (MB) and methyl orange (MO) removal. The carbonization temperature (400 °C ∼ 600 °C), the GNMACs dosage (5 mg ∼ 25 mg), and the dye solution pH (4 ∼ 12) were controlled. The results indicated the optimal adsorption performance can be achieved with the carbonization temperature of 550 °C and the adsorbent dosage of 20 mg. The GNMACs carbonized at 550 ℃ possessed a porous structure with the mesopore volume of 1.095 cm 3 /g, the specific surface area of 802.987 m 2 /g, and the average pore diameter of 5.87 nm. Within a wide pH range from 4 to 12, GNMACs removed MB with an efficiency above 98.57 % and MO with an efficiency above 98.77 %. Additionally, the adsorption process of MB and MO onto GNMACs followed the pseudo-second-order kinetic model and the Redlich-Peterson isothermal adsorption model, with adsorption capacities of 816.04 mg/g and 286.99 mg/g, respectively. The adsorption was facilitated by hydrogen bonding, electrostatic attraction, π-π interaction, and pore filling. The results indicated the GNMACs can be used as an adsorbent to remove MB and MO from the wastewater.
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