INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Qiang Yao,Jing Guo,Fucheng Guan,Jia Li,Da Bao,Jiahao He,Xinbin Ji,Xuecui Song,Qiang Yang
In order to improve the adsorption performance of MoS 2 , as well as to solve the problems of MoS 2 -powder in adsorption, which is prone to agglomeration and difficulty to be recycled, we prepared MoS 2 -nanoflowers(MoS 2 -NFs), and mixed them with sodium alginate/polyvinyl alcohol(SA/PVA) to prepare MoS 2 -NFs/SA/PVA xerogel(MSP) by freezing-lyophilization. Then two forms of xerogels - block-MSP(MSPB) and spherical-MSP(MSPS) were prepared, and they were used as methylene blue(MB) and Cu 2+ adsorbent. It was found that MoS 2 -NFs were evenly dispersed inside the SA/PVA with no agglomeration, while the interior of MSPB/MSPS showed the structure of parallel-pores and radial-pores, respectively. The adsorption capacity of MSPB/MSPS on MB can reach 233 mg/g, which is five times higher than SA/PVA-gel, showing excellent synergistic-adsorption effect, and the adsorption capacity for Cu 2+ reaches 271 mg/g. The adsorption mechanism indicated that the adsorption of MB by MSPB/MSPS conformed to pseudo-first-order model, with electrostatic force as the main force. And their adsorption of Cu 2+ conformed to pseudo-second-order model and was dominated by Lewis acid/base soft-soft interactions. Notably, after long-term adsorption, MSPB/MSPS maintains its shape and more than 90 % of the adsorption capacity, ensuring the recovery and reuse of materials. So, MSPB/MSPS has great potential in adsorption, providing a new solution for sewage purification .
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International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yong Chang,Fengli Gao,Tong Wu,Qiuzhi Pan,Lin Liu,Qijun Song
Protein kinases play a vital regulatory role in various biological processes. In this work, we developed an electrochemical biosensor for the detection of protein kinases using methylene blue (MB)-functionalized Zr-based metal-organic frameworks (MOFs, UiO-66-NH 2 ) as the signal labels. The results of UV-Vis spectroscopy, X-ray diffraction and N 2 adsorption–desorption experiments confirmed the successful encapsulation of MB into UiO-66-NH 2 . The phosphate groups in phosphorylated peptides were recognized by UiO-66-NH 2 via the robust coordination with Zr-O clusters on the surface of MOFs. The encapsulated MB molecules in UiO-66-NH 2 produced a strong electrochemical signal for highly sensitive detection of protein kinases, which was recorded by square wave voltammetry (SWV). With protein kinase A (PKA) as a model target, the biosensor achieved a detection limit of 0.02 U/mL and a linear range from 0.05 to 20 U/mL. The proposed biosensor was utilized to screen potential inhibitors and determine PKA in serum samples with satisfactory results. This work provided an effective strategy for electrochemical assays of phosphorylation-related biological events in clinical diagnosis.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
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2023
·
IF 3.8
Shanghong Ma,Jianbo Qu,Haitao Zhang,Xiubin Cui,Peng Ye,Qingfei Hu,Mingzhen Chao
A series of adsorbent materials (WPU-HA x – y ) with three–dimensional porous structure, green sustainability and excellent performance were prepared and evaluated for the removal of methylene blue using non–toxic and environmentally friendly waterborne polyurethane as matrix material and humic acid, a biomass material, as the functional material. The newly synthesised adsorbents were characterised by infrared spectroscopy, scanning electron microscopy, specific surface area and thermogravimetric. The effects of contact time (0–8 h), starting concentration (10–100 mg·L –1 ), pH (3–11), solution temperature (30–60 °C) and coexisting ions (Ca 2+ , Na + , K + , Mg 2+ ) on the performance were investigated. Pseudo-first-order, pseudo-second-order, elovich and intra-particle diffusion model were used to analyze the adsorption kinetics, the Langmuir, Freundlich, Temkin and Dubin–Radushkovich adsorption isotherms were evaluated, and the adsorption behaviour of the adsorbent materials was found to be more appropriate for the pseudo-second-order model for chemical pollutant removal and the Langmuir model which depends on monolayer adsorption. WPU-HA 2 -3 stood out with a maximum adsorption capacity of 813.0081 mg·g –1 fitted to the pseudo-second-order and 309.2832 mg·g –1 fitted to the Langmuir model, showing superior adsorption performance and regenerability.
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BIORESOURCE TECHNOLOGY
·
2023
·
IF 11.4
Zepeng Liu,Jie Zhang,Liping Zhang,Ying Guan,Hao Ji,Yu Zhang,Hui Gao
Biochar (BC) prepared from Medulla Tetrapanacis was recognized as having potential in environmental remediation because of its porous texture, abundant chemical surface groups and mineral composition. In this study, a novel modified biochar (KBC) derived from Medulla Tetrapanacis achieved efficient adsorption of Congo red (CR) and methylene blue (MB). Characterization results suggested that the modification had little effect on the group distribution of KBC, but a dramatic expansion of specific surface area was observed on KBC (1180.45 m 2 /g) compared to BC (198.51 m 2 /g). KBC exhibited a maximum sorption of 584.17 mg/g for CR and 318.01 mg/g for MB. Kinetic and isotherm studies revealed sorption of CR and MB by KBC was chemosorption, which occurred on the monolayer surface. The comprehensive analysis also provided the basis for the application of KBC to practical production. These outcomes suggested that KBC may become a new option for the effluent treatment.
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Gels
·
2023
·Vol. 9
·期 1
·40
·
IF 4.6
Xuelun Zhang,Feng Li,Xiyu Zhao,Jiwen Cao,Shuai Liu,You Zhang,Zihui Yuan,Xiaobo Huang,Cornelis F. De Hoop,Xiaopeng Peng,Xingyan Huang
In recent years, the scarcity of pure water resources has received a lot of attention from society because of the increasing amount of pollution from industrial waste. It is very important to use low-cost adsorbents with high-adsorption performance to reduce water pollution. In this work, a gel adsorbent with a high-adsorption performance on methylene blue (MB) and Cu(II) was prepared from bamboo nanocellulose (BCNF) (derived from waste bamboo paper) and montmorillonite nanosheet (MMTNS) cross-linked by polyethyleneimine (PEI). The resulting gel adsorbent was characterized by Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (SEM), X-ray photoelectron spectroscopic (XPS), etc. The results indicated that the MB and Cu(II) adsorption capacities of the resulting gel adsorbent increased with the solution pH, contact time, initial concentration, and temperature before equilibrium. The adsorption processes of MB and Cu(II) fitted well with the fractal-like pseudo-second-order model. The maximal adsorption capacities on MB and Cu(II) calculated by the Sips model were 361.9 and 254.6 mg/g, respectively. The removal of MB and Cu(II) from aqueous solutions mainly included electrostatic attraction, ion exchange, hydrogen bonding interaction, etc. These results suggest that the resulting gel adsorbent is an ideal material for the removal of MB and Cu(II) from aqueous solutions.Keywords:gel;adsorption;nanocellulose;montmorillonite;methylene blue;heavy metal
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MICROPOROUS AND MESOPOROUS MATERIALS
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2019
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IF 4.182
Shi-Wen Lv,Jing-Min Liu,Hui Ma,Zhi-Hao Wang,Chun-Yang Li,Ning Zhao,Shuo Wang
Nowadays efficient and rapid removal of organic dyes from wastewater is still a complicated task with great challenge. Herein, the amino groups functionalized UiO-66 (denoted as UiO-66-NH 2 ) was synthesized via a one-step process and then applied in simultaneous removal of methyl orange (MO) and methylene blue (MB) for the first time. The as-prepared UiO-66-NH 2 showed excellent adsorption ability to both MO and MB, and the maximum adsorption capacities were as high as 148.4 (MO: pH = 5, T = 25 °C) and 549.6 (MB: pH = 9, T = 25 °C) mg/g, respectively. Significantly, UiO-66-NH 2 exhibited highly pH-dependent selective adsorption for MO and MB. More interestingly, the simultaneous removal of MO and MB from the MO/MB mixture solution could be achieved by UiO-66-NH 2 under neutral condition. The adsorption mechanisms and reusability were also investigated. Overall, UiO-66-NH 2 could be a perfect candidate for removing MO and MB application in dye-containing wastewater treatment . And the results from this study also provided some new insights for the treatment of wastewater containing various dyes.
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Polymers
·
2018
·Vol. 10
·期 12
·1393
·
IF 2.935
Jie Cao,Jianbei Zhang,Yuejun Zhu,Shanshan Wang,Xiujun Wang,Kaihe Lv
The pollution of water resources has become a worldwide concern. The primary pollutants including insoluble oil, toxic dyes, and heavy metal ions. Herein, we report a polymer adsorbent, named SPCT, to remove the above three contaminants from water simultaneously. The preparation process of SPCT contains two steps. Firstly, a hydrogel composed of sulfonated phenolic resin (SMP) and polyethyleneimine (PEI) was synthesized using glutaraldehyde (GA) as the crosslinking agent, and the product was named SPG. Then SPCT was prepared by the reaction between SPG and citric acid (CA) at 170 °C. SPCT exhibited an excellent performance for the removal of methylene blue (MB) and Cu(II) from aqueous solution. For a solution with a pollutant concentration of 50 mg L−1, a removal efficiency of above 90% could be obtained with a SPCT dosage of 0.2 g L−1for MB, or a SPCT dosage of 0.5 g L−1for Cu(II), respectively. SPCT also presented an interesting wettability. In air, it was both superhydrophilic and superoleophilic, and it was superoleophobic underwater. Therefore, SPCT could successfully separate oil-in-water emulsion with high separation efficiency and resistance to oil fouling. Additionally, SPCT was easily regenerated by using dilute HCl solution as an eluent. The outstanding performance of SPCT and the efficient, cost-effective preparation process highlight its potential for practical applications.Keywords:wastewater treatment;adsorption;emulsion separation;thermal crosslinking;superhydrophilicity
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Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Guanru Chang,Hui Zhang,Shikuo Li,Fangzhi Huang,Yuhua Shen,Anjian Xie
A novel hydrogel shell on cancer cells was prepared via in situ photopolymerization of polyethyleneglycol diacrylate (PEGDA) using methylene blue (MB) sensitized mesoporous titania nanocrystal for effective photodynamic therapy (PDT). TiO 2 in this system served as an effective photosensitizer and initiator for the formation of hydrogel, also can protect the MB from being degraded into an inactive form. While MB was used as a significant photosensitive additive to improve the photochemistry effects of TiO 2 and widen its optical response area to near infrared region (660–900 nm). The PEGDA hydrogel with peritumoral injectability shows competitive advantages, i.e. good biocompatibility and hydrophily, selective and minimally invasive delivery of TiO 2 @MB, maintaining a high PDT drug concentration for inducing tumor apoptosis, localized and sustainable release under 660 nm laser irradiation for reducing side effect. The hydrogel also could load chemo-therapy drugs, and serve as a versatile platform for multimode antitumor treatment.
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BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Sen Liu,Jihui Li,Shuang Xu,Mengzhen Wang,Yucang Zhang,Xinghua Xue
A phosphomolybdic acid promoted oxidative pyrolysis was described for preparation of banana pseudostem biochar. The strategy succeeded to introduce oxygen-containing groups onto the biochar surface at low temperature. In addition, pore channels were created, demonstrated by the SEM images of biochar prepared at 200 °C. Adsorption experiments showed that the biochar pyrolyzed at 200 °C exhibited much better adsorption capability than others pyrolyzed at higher temperatures for methylene blue (MB). The adsorption capability of biochar prepared at 200 °C was enhanced from 87.28 to 146.23 mg/g at 45 °C with phosphomolybdic acid modification. The enhancement of adsorption capacity could be ascribed to the increase of surface oxygen-containing functional groups and pore channels. In-situ generated carboxylic groups during adsorption and desorption played an important role in removal of MB. Adsorption of MB was mainly attributed to hydrogen bonding, electrostatic interactions and cation exchanges.
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APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Minhong Xu,Guoxiang Pan,Yue Meng,Yuhua Guo,Tao Wu,Haifeng Chen
MgAlCe ternary hydrotalcites-like compounds (MgAlCe-HTlc) with different Al 3+ /Ce 3+ molar ratio were synthesized by co-precipitation method. In addition, MAlCe-HTlc (M: Co, Ni, Zn) with Al 3+ /Ce 3+ molar ratio 0.95: 0.05 were also synthesized. The attained LDH were characterized by SEM, EDX, XRD, FT-IR, TG-DTA, XPS and UV-Vis DRS techniques. The results indicated that the synthesized MgAlCe-HTlc appeared to be the typical layered structure when it contains Al 3+ and Ce 3+ ions simultaneously. Three kinds of attained MAlCe-HTlc also had typical layered structure of LDH. Furthermore, the thermal stability of MgAlCe-HTlc decreased by the substitution of Ce 3+ for Al 3+ ions. When Mg 2+ was replaced by Co 2+ , Ni 2+ or Zn 2+ , the decomposition temperatures reduced. The Ce 3d spectrum of Mg 3 Al 0.8 Ce 0.2 -HTlc before and after used indicated presence of mixed valence states of Ce 3+ and Ce 4+ . The MgAlCe-HTlc exhibited a relatively high degradation capacity for methylene blue (MB), while degradation ability of Mg 3 Al 0.95 Ce 0.05 -HTlc/H 2 O 2 was highest. The remaining rate of the MB was about 6.46% after irradiation for 80 min. The order of degradation effects about MB was as follow: MgAlCe-HTlc>ZnAlCe-HTlc>CoAlCe-HTlc≈NiAlCe-HTlc. In addition, the effects of different parameters such as pH of the solution, catalyst type and dosage, concentration of MB, as well as the stability of catalyst were investigated. The photocatalytic degradation mechanism of MB showed that the OH, h + and superoxide anion produced in Mg 3 Al 0.95 Ce 0.05 -HTlc/H 2 O 2 system were all active species , while OH played a major role.
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RSC Advances
·
2019
·Vol. 9
·期 51
·29772-29778
·
IF 3.049
Longfei Zhang,Li Yang,Yewei Xu,Guanjun Chang
A novel porous organic material 4-hydroxyindole-formaldehyde/NaOH (4-HIF/NaOH) aerogel was prepared via a facile polymerization, soaking in NaOH aqueous solution and ambient drying method. 4-HIF/NaOH aerogel porous polymer networks with high surface area have been applied as efficient adsorbents to remove methylene blue from wastewater via synergistic effects of cation–π interaction induced electrostatic interaction, electrostatic interaction and π–π interaction. The adsorption capacity calculated by adsorption isotherms at 303 K was 1016.9 mg g−1 which is higher than those observed for methylene blue on other aerogels and most other materials. Furthermore, the methylene blue loaded 4-HIF aerogel can easily be regenerated with 0.1 M HCl solution and ethanol wash, retaining over 75% of the adsorption capacity after recycling five times.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2018
·
IF 4.61
Shanshan Liu,Heyi Ge,Cuicui Wang,Yu Zou,Jingyu Liu
The objective of this study was to synthesize a novel, efficient and economical bio-adsorbent with three dimensions (3D) structure using a direct assembly method for removal of methylene blue (MB) from aqueous solution. The raw materials were corn straw core (CSC) and graphene oxide (GO). The variables that affected adsorption capacity were tested. GO loading could facilitate the removal rate. When 5 wt% GO was added (CSC-5GO), the removal rate was increased by 21.62% compared to pure CSC (64.58%). Furthermore, the adsorption by CSC-5GO fitted pseudo-second-order kinetic model (R 2 > 0.998) and Temkin model (R 2 > 0.955). The maximum adsorption capacity was 414.03 mg g −1 for MB at pH = 12, 298 K and MB concentration of 1000 mg L −1 . The adsorption thermodynamic test results suggested that the adsorption was a spontaneous, exothermic and randomness decrease process. Furthermore, after five cycles of adsorption-desorption test, the adsorbent removal rate was >90%, which implied that CSC-5GO had an excellent reproducibility.
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