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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高影响因子
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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INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Guangyu Wu,Chengwei Zhou,Haoxin Li,Siye Xia,Yongli Zhu,Jiangang Han,Weinan Xing
Design and fabrication of outstanding adsorbents for treating organic pollutants in wastewater following green chemistry principles remain huge challenging. In this paper, a biomass cellulose aerogel@ZIF-8 (CA@ZIF-8) based on bamboo leaves cellulose aerogel (CA) was controllable synthesized and used for the removal of methylene blue (MB) from aqueous solution. CA was prepared from bamboo leaves by NaOH/ urea low temperature dissolution method and freeze-drying method, and then ZIF-8 was grown in situ on its surface, successfully preparing CA@ZIF-8 composite with three-dimensional porous structure. The tests of X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) were used to characterize the structures of materials, and the related results showed that arsenic was successfully adsorbed by the prepared CA@ZIF-8. The influences of pH (2−12), contact time (5–180 min), temperature (298 K, 308 K, 318 K) and other factors on MB adsorption quantity were studied in the adsorption experiments, and the maximum adsorption capacity was about 90.18 mg/g at 298 K. The adsorption thermodynamics showed that the adsorption process of CA@ZIF-8 to MB was spontaneous and decreased with the increase of temperature. The possible adsorption mechanism was also suggested. The CA@ZIF-8 exhibited good reusability that the removal of MB remained above 77.25 % after 5 cycles. The above results show that CA@ZIF-8 is a economically and proficient suitable material for removing MB from wastewater.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2022
·
IF 8.91
Ming Wang,Jinlong Yan,Yumeng Xu,Xiangqian Zhou,Yusen Diao,Hui Wang,Jiahao Bian,Cheng Liu,Guixiang Quan
N-doping for the preparation of functional carbon materials is a trending research topic. In this study, N-rich biochar (BC) was prepared by calcining naturally N rich shrimp shells under oxygen-limiting environment, and the calcining temperatures were controlled. BC were activated with 5% hydrochloric acid solutions and then post-modified with ball-milling to obtain a series of novel adsorbents (MBCs). All samples were characterized by SEM, BET, FT-IR, XRD , XPS, TG, and element analysis. Surface area, pore volume, and other surface functional groups were significantly improved after acidizing and ball-milling. The adsorption capacities for MB were MBC350 > MBC500 > MBC650 >BC350 > BC650 > BC500, and the equilibrium adsorption capacities were 575.01 mg/g, 506.52 mg/g, 424.59 mg/g, 113.31 mg/g, 93.53 mg/g and 86.25 mg/g, respectively. The excellent adsorption performance of MBCs for MB was ascribed to Lewis acid-base interaction, π-π interaction, electrostatic interaction and van der Waals, and the quinone group and pyridinic-N on the surface of the MBCs are identified as the major active sites. Taken together, ball-milled shrimp shell biochar is a promising material for cation dye adsorption.
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高影响因子
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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TALANTA
·
2023
·
IF 6.1
Xiaojun Wen,Huan Cheng,Weilong Zhang,Lijun You,Jumei Li
To enable the widespread application of surface-enhanced Raman scattering (SERS) technique in practical sensing of organic pollutants, it is essential to develop a reliable SERS substrate that offers both high sensitivity and reusability. In this study, we employed a simple and rapid in-situ deposition method to coat Ag nanoparticles onto flower-like Ni(OH) 2 spheres, resulting in the formation of Ni(OH) 2 /Ag composites with excellent photocatalytic performance and SERS activity. These composites were used as a promising SERS analysis tool for effective detection of organic pollutants, including ciprofloxacin hydrochloride (CIP) and methylene blue (MB). Notably, the composites exhibited outstanding detection limits of 10 −8 M for MB and 10 −7 M for CIP, respectively, and showed a strong linear relationship between SERS intensities and the logarithmic concentration (R 2 ≥ 0.97). Moreover, under simulated sunlight irradiation, the Ni(OH) 2 /Ag composites efficiently degraded MB and CIP molecules within a short period of 120 min for MB and 130 min for CIP. This demonstrated their practical reusability, as evidenced by their consistent performance over five cycles of SERS sensing. These findings underscore the significant potential of these composites for SERS-based detection of trace pollutants and ecological restoration through photocatalytic reactions in the future.
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Biosensors-Basel
·
2023
·Vol. 13
·期 8
·783
·
IF 5.4
Huiwen Xiong,Pintao Li,Fei Cun,Hui Chen,Jilie Kong
Considering the high risk of heavy metal ions (HMIs) transferring through the food chain and accumulating in milk, a flexible and facile point-of-care testing (POCT) platform is urgently needed for the accurate, sensitive, and highly selective on-site quantification of multiple HMIs in milk. In this work, a cost-effective disk with six screen-printed electrodes (SPEs) was designed for hand-held electrochemical detection. Metal organic frameworks (MOFs) were adopted to amplify and enhance the electrochemical signals of methylene blue (MB). Using differential pulse voltammetry (DPV) methods, low limits of detection for four HMIs (Cd2+, 0.039 ppb; Hg2+, 0.039 ppb; Pb2+, 0.073 ppb; and As3+, 0.022 ppb) were achieved within four minutes. Moreover, the quantitative POCT system was applied to milk samples. The advantages of low cost, ease of on-site implementation, fast response, and accuracy allow for the POCT platform to be used in practical monitoring applications for the quantitation of multiple HMIs in milk samples.Keywords:heavy metal ions;point-of-care testing;electrochemical detection;metal organic frameworks;on-site
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高影响因子
Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Wu Mingzhou,He Shuqing,Ha Enna,Hu Junqing,Ruan Shuangchen
The removal of toxic organic dyes from wastewater has received much attention from the perspective of environmental protection. Metal oxides see wide use in pollutant degradation due to their chemical stability, low cost, and broader light absorption spectrum. In this work, a Cu2O−centered nanocomposite Cu2O@SiO2/MnO2−PEG with an average diameter of 52 nm was prepared for the first time via a wet chemical route. In addition, highly dispersed MnO2 particles and PEG modification were realized simultaneously in one step, meanwhile, Cu2O was successfully protected under a dense SiO2 shell against oxidation. The obtained Cu2O@SiO2/MnO2−PEG showed excellent and stable photo−Fenton−like catalytic activity, attributed to integration of visible light−responsive Cu2O and H2O2−responsive MnO2. A degradation rate of 92.5% and a rate constant of 0.086 min−1 were obtained for methylene blue (MB) degradation in the presence of H2O2 under visible light for 30 min. Additionally, large amounts of •OH and 1O2 species played active roles in MB degradation. Considering the enhanced degradation of MB, this stable composite provides an efficient catalytic system for the selective removal of organic contaminants in wastewater.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Guangjun Lv,Xin Dai,Yide Qiao,Qiang Tan,Yongning Liu,Yuanzhen Chen
Supercapacitors are desired to deliver high power and energy density concurrently, and the introduction of a redox reaction is an effective strategy to improve their capacitive performance. Herein, methylene blue (MB) with redox was employed to functionalize coal-based activated carbons (ACs) as electrode materials for energy storage. The optimized AC shows a high specific capacitance of 408.1 F g −1 in 6 M KOH, deriving from the contribution of the electrical double-layer capacitance of pores and pseudocapacitance of oxygen groups. Interestingly, pure MB shows no capacitive performance mainly due to its low conductivity, while the optimized composite of AC adsorbed MB (AC/MB) surpasses the pure MB and optimized AC in any capacitive performance, displaying a relationship of mutual promotion based on functional combination. The best AC/MB sample exhibits a high specific capacitance of 431.8 F g −1 at 1 A g −1 , and 356.1 F g −1 (82.5%) at an ultrahigh current density of 180 A g −1 , implying an excellent rate performance. Aiming to deliver maximum energy density, an accurate universal method is proposed to match the mass ratio of negative to positive. The optimized asymmetric supercapacitor AC/MB(+) || AC(-) delivers an energy density of 11.0 Wh kg −1 , a power density up to 15.3 kW kg −1 and a high capacity retention rate of 96.3% after 10,000 cycles, displaying good chemical stability. This work proposes a promising strategy for ultrafast store/release energy at high energy density, and also provides an application direction for AC and MB.
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Biosensors-Basel
·
2022
·Vol. 12
·期 8
·556
·
IF 5.743
Xiaoqian Wei,Shanlin Wang,Yujuan Zhan,Tianhan Kai,Ping Ding
We report a methylene blue (MB)-modified electrochemical aptamer (E-AB) sensor for determining microcystin-LR (MC-LR). The signal transduction of the sensor was based on changes in conformation and position of MB induced by the binding between MC-LR and the modified aptamer probe. In the absence of MC-LR, an aptamer probe was considered partially folded. After combining aptamer and MC-LR, the configuration of the aptamer probe changed and facilitated the electron transfer between MB and the electrode surface. As a result, an increased current response was observed. We optimized the parameters and evaluated the electrochemical performance of the sensor using square wave voltammetry (SWV). MC-LR was measured from 1.0 to 750.0 ng/L with a detection limit of 0.53 ng/L. The reliability of the method was verified by the determination of MC-LR in environmental real samples, such as pond water and tap water. Moreover, we demonstrated that this reagent-less biosensor could be regenerated and reused after rinsing with deionized water with good accuracy and reproducibility. As a reusable and regenerable E-AB sensor, this rapid, reagent-free, and sensitive sensing platform will facilitate routine monitoring of MC-LR in actual samples.Keywords:microcystin-LR;methylene blue;aptamer;electrochemical sensor
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高影响因子
ANALYTICAL LETTERS
·
2022
·
IF 2.267
Caifen Chen,Dan Li,Baokang Jin
A selective, sensitive electrochemical biosensor is reported to determine bisphenol A (2,2-bis(4-hydroxyphenyl) propane, BPA) based on target-induced chain release. A gold electrode was premodified with dendritic gold nanoparticles (AuNPs) by direct electrochemical deposition to increase the active surface area of the electrode to immobilize hydrosulfonyl group-containing capture DNA (C-DNA). C-DNA was hybridized with a BPA-specific aptamer (T-DNA) to form a double helical structure. After the embedding of methylene blue (MB), this structure emitted measurable electrochemical signals. BPA specifically binds to T-DNA to form a stable BPA G-tetrad structure, thereby inducing the release of the aptamer chain and the embedded MB from the surface into solution, resulting in the reduction of the current signal. The constructed electrochemical biosensor provided a linear response to BPA concentration from 1.0 × 10−9 M to 5.0 × 10−7 M with a detection limit of 9.8 × 10−10 M. This strategy also provided good selectivity for BPA compared to similar interferents.
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危险品化学品经营许可证（带存储）