JOURNAL OF POLYMER RESEARCH
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2023
·Vol. 30
·期 8
·1-16
·
IF 2.8
Shi Liang,Liu Wenwu,Zhang Xiaomei,Hu Jingsong
Environmentally friendly crosslinked carboxymethyl cellulose-based hybrid hydrogels (CCMC/OMMT) were prepared from a grafting of 2-acrylamide-2-methylpropane sulfonic acid (AMPS) onto CCMC and reinforced with Organo-Montmorillonite (OMMT) in this study as efficient adsorbents for methylene blue (MB). FTIR, SEM, XRD, EDS, XPS, and TGA techniques have been employed to investigate the composition and shape of the setup hydrogels. The MB adsorption ability of CCMC/OMMT was investigated concerning the initial MB concentration, pH, interaction time, and temperature. The capacity of CCMC/OMMT to adsorb on MB was 490.5 mg/g at 313.15 K and pH 7.0. Furthermore, the adsorption kinetics and isotherm were accurately predicted using the pseudo-second-order dynamic theory and Langmuir isotherm theory. The estimated thermal parameters ΔG 0 , ΔH 0 , and ΔS 0 suggested that the molecules of MB binding on the CCMC/OMMT were spontaneous and endothermic. The procedures of sorption were facilitated by electrostatic attraction and hydrogen-bonding interaction. Additionally, all manufactured hydrogels were reusable for MB removal. As a result, CCMC/OMMT can be used as environmentally safe, productive, and washable stuff for MB in sewage treatment.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Haichao Xu,Baijun Liu,Mingyao Zhang
This study reports the preparation of polystyrene-divinylbenzene mesoporous microspheres and their composite microspheres with silver nanoparticles using two-step seed-swelling polymerization. Not only the effects of different swelling agents on the morphology and structure of mesoporous microspheres were investigated, but also the difference between sulfonic acid microspheres and silver nanoparticle composite microspheres was discussed during the degradation of methylene blue (MB) dyes. The composite microspheres were characterized using X-ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), Thermogravimetric analysis (TGA), specific surface area and pore size analyzer (BET) and Energy-dispersive spectrometer (EDS) techniques. In the dibutyl phthalate system, a small amount of toluene was introduced, which increased the specific surface area of mesoporous microspheres to 68.51 m 2 /g, while the average pore diameter decreased to 13.62 nm. The degradation experiments showed that the sulfonic acid groups, introduced by the hydrophilic modification, had electrostatic interactions with MB, which promoted the rapid adsorption of MB through microspheres. Meanwhile, the loaded silver nanoparticles (Ag NPs) could also catalyze the reduction of MB, which further improved the rate of degradation of MB using the composite microspheres. Therefore, compared with sulfonated polystyrene mesoporous microspheres (SPPS), the removal efficiency of Ag@SPPS composite microspheres for MB was almost twice. In addition, after five cycles of recycling, the Ag@SPPS composite microspheres maintained a degradation efficiency of 97.12%, indicating excellent reuse value. The results provide a novel pathway to treat dye-containing wastewater.
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Environmental Technology & Innovation
·
2023
·
IF 7.1
Kaifeng Wang,Na Peng,Dongqing Zhang,Haijun Zhou,Jinfeng Gu,Jiahui Huang,Chen Liu,Yang Chen,Yang Liu,Jianteng Sun
This study investigated the adsorption performance of methylene blue using Ca(OH) 2 -modified biochar derived from agricultural and forestry wastes. The results showed that the modified rice straw biochar with 20% Ca(OH) 2 addition paralyzed at 500 °C exhibited the best adsorption performance for methylene blue. The adsorption data were fitted with four kinetic models and four isothermal adsorption models. Among which, the pseudo-second-order kinetic model and Langmuir isothermal model were the best fit, with high correlation coefficient of more than 0.99. The adsorption capacity of Langmuir fitting was 333.3 mg g −1 , which was 12.5 times higher than that for pristine rice straw biochar. The high adsorption capacity was maintained in a wide range of initial pH value of 4–12. SEM-EDX, organic element, surface structure, FTIR and XRD analysis indicated that Ca(OH) 2 modification significantly increased the polarity (higher O/C value), Ca content and the number of oxygen-containing functional groups (C-O and CO 3 2 − ) for pristine rice straw biochar, thereby substantially enhancing and improving the chemical adsorption of methylene blue. The adsorption mechanism involved for methylene blue included functional groups complexation, electrostatic interaction, ion exchange (mainly Ca 2＋ ) and π – π stacking. This study demonstrated that the modified rice straw biochar, as green and environmentally friendly raw material with cost-effectiveness, exhibited a great potential for broad application prospective subject to remediating printing and dyeing-contaminated wastewater.
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CHEMOSPHERE
·
2023
·
IF 8.8
Hao Ding,Gongsong Tong,Jingchun Sun,Jiewei Ouyang,Fangge Zhu,Zhi Zhou,Nan Zhou,Mei’e Zhong
Biochar, as an adsorbent, is widely used for the removal of organic pollutants in water body. Hence, after saturated adsorption, regeneration treatment is required to recover the adsorption performance of biochar. In this study, a biochar (P-GBC) prepared by phosphoric acid activation showed high adsorption capacity for methylene blue (MB) with the maximum adsorption capacity (Q m ) of 599.66 mg/g. Then, regeneration treatments using 4 mM peroxymonosulfate (PMS), 0.2 M hydrogen peroxide (H 2 O 2 ) and their mixture were used to regenerate MB-saturated biochar with regeneration efficiencies of 58.24%, 66.01% and 94.88%, respectively. Combining with degradation and quenching experiments, it is found that synergistic effect of H 2 O 2 desorption and PMS degradation is responsible for the enhancement of regeneration efficiency of P-GBC in H 2 O 2 -PMS system and enables a high mineralization rate of 82.68% for the MB adsorbed on P-GBC. Furthermore, EPR tests indicate that singlet oxygen ( 1 O 2 ) is assigned as the primary activate species for the degradation of MB and XPS analyses confirm that graphite nitrogen and carbonyl on P-GBC are the main active sites for the activation of PMS. Compared with conventional regenerants, H 2 O 2 -PMS system has the advantages of low dosage, high mineralization efficiency, and easy accessibility, and is also effective, sustainable and environmentally friendly for the regeneration of organic pollutants-saturated biochar.
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MATERIALS CHEMISTRY AND PHYSICS
·
2022
·
IF 4.778
An Liu,Shu He,Jie Zhang,Jia Liu,Wei Shao
Although zeolitic imidazole framework-8 (ZIF-8) has been widely used as the organic dye adsorbent, a suitable carrier is needed to solve the issues of low stability and poor dispersibility in water. Poly(acrylic acid) was grafted onto cellulose to prepare MAA aerogel with more active sites for MB adsorption which was applied as the carrier for ZIF-8. Here, ZIF-8/MAA composite aerogel was prepared by in situ growing the ZIF-8 nanoparticles onto the walls of the pores of MAA aerogel. The prepared adsorbent was characterized by SEM, FTIR, and TG analysis . A series of adsorption experiments were carried out to optimize the various parameters affecting MB adsorption behaviors (the adsorbent dosage, solution pH, initial MB concentration, adsorption time, and adsorption temperature). The experimental data for the adsorption process followed a pseudo-secondary kinetic model, more in line with the Langmuir isotherm (R 2 = 0.992), with a maximum adsorption capacity of 1492.99 mg/g. The prepared adsorbent exhibited great reusability even after five repeated cycles of adsorption-regeneration. The adsorption mechanism was discussed in depth. Thus, the prepared ZIF-8/MAA aerogel can be used as an environmentally friendly, efficient, stable and reusable adsorbent for MB in wastewater treatment.
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ACS Biomaterials Science & Engineering
·
2019
·
IF 4.511
Yudi Ruan,Xiaodan Jia,Chao Wang,Wenyao Zhen,Xiue Jiang
The concentration of intracellular reactive oxygen species directly determines the effect of photodynamic therapy. Reducing intracellular glutathione (GSH) content can increase reactive oxygen species (ROS) level. Therefore, it is extremely important to construct a nanoplatform that can promote photodynamic therapy by consuming GSH. In this study, we synthesized Cu–typtone complex nanoparticles (Cu–Try NPs) by a simple green method and demonstrated their ability to consume GSH to increase intracellular ROS for the first time. Photosensitizer methylene blue was loaded onto Cu–Try NPs (Cu–Try/MB NPs) for enhanced photodynamic therapy. Studies in vitro and in vivo illustrated that enhanced photodynamic therapy based on Cu–Try/MB NPs can kill cancer cells effectively.
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Materials Research Express
·
2018
·Vol. 6
·期 3
·035601
·
IF 1.151
Xinhui Duan,Wei Hong,C Srinivasakannan,Xin Wang
Hydrochar synthesized using hydrothermal carbonization of walnut biomass, is found to be rich in surface functional groups, having low surface area, high pore diameters, as a result poor adsorption capacity. The present work attempts to modify hydrochar, using silicate via a one-step hydrothermal route. The hydrochar silicate composite (HS) exhibited porosity with surface area of 106 m2 g−1 and excellent adsorption capabilities for methylene blue (MB) (434.78 mg g−1) at 35 °C. The adsorption capacity of the HS was found to be superior as compared to hydrochar and silicate. The adsorption isotherms as well as the adsorption kinetic data of HS were well describied by the Langmuir adsorption model and the pseudo-second order kinetic model. The adsorption was physical and the adsorption mechanism was partly controlled by the intraparticle diffusion. The study identified HS to be a potential low cost adsorbent for liquid phase adsorption involving high molecular weight compounds.
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JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 16
·11037-11055
·
IF 3.442
Zhang Bo,Zhang Tailiang,Zhang Zhidong,Xie Mingyuan
A graphene/magnetite/montmorillonite nanocomposite (GQDs/Fe 3 O 4 /MMT) was synthesized via a simple green hydrothermal method. The effects of pH, temperature, contact time, adsorbent quality, dye concentration and ultrasonication on the adsorption performance of methylene blue (MB) were investigated. For ultrasonic-assisted adsorption, the adsorption rate of GQDs/Fe 3 O 4 /MMT can reach 10 s. Ultrasound strongly affected the adsorption equilibrium time but did not affect the maximum adsorption capacity. The main reason for ultrasonic-assisted dyes ultrafast adsorption is cavitation that graphene quantum dots (GQDs) promote nucleation. By adjusting the amount of surface charge, the adsorbent has excellent selective ultrasonic-assisted ultrafast adsorption properties of mixed dyes. The adsorption performance of the GQDs/Fe 3 O 4 /MMT was weakly affected by temperature. The theoretical and experimental maximum adsorption capacities were 429.4 mg/g and 225.0 mg/g, respectively. The adsorption kinetics and adsorption isotherms agree well with the pseudo-second-order equation and the Langmuir equation, respectively. After six adsorption/desorption cycles, the adsorption and desorption efficiency of the dye decreased slightly. The results indicated that the GQDs/Fe 3 O 4 /MMT nanosorbent has strong potential for removing the cationic dye MB from wastewater.
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NANO
·
2018
·
IF 1.1
Shipeng Yang,Siwei Peng,Chunhui Zhang,Xuwen He,Yaqi Cai
Nanoparticles of the semiconductor catalyst Cd x Zn 1 − x S were embedded into the metal organic framework MIL-101(Cr) to obtain Cd x Zn 1 − x S@MIL-101(Cr) nanocomposites. These materials not only possess high surface areas and mesopores but also show good utilization of light energy. The ultraviolet-visible diffuse reflectance patterns of Cd x Zn 1 − x S@MIL-101(Cr) nanocomposites showed that Cd 0 . 8 Zn 0 . 2 S@MIL-101(Cr) possessed good visible light response ability among the synthesized nanocomposites. The photocatalytic performance of the Cd x Zn 1 − x S@MIL-101(Cr) nanocomposites were tested via degradation and mineralization of methylene blue in neutral water solution under light irradiation using a 300W xenon lamp. As a result, using Cd 0 . 8 Zn 0 . 2 S@MIL-101(Cr) as a catalyst, 99.2% of methylene blue was mineralized within 30 min. Due to the synergistic effect of adsorption by the MIL-101(Cr) component and photocatalytic degradation provided by the Cd 0 . 8 Zn 0 . 2 S component, the Cd 0 . 8 Zn 0 . 2 S@MIL-101(Cr) catalyst displayed superior photocatalytic performance relative to Cd 0 . 8 Zn 0 . 2 S and MIL-101(Cr). Furthermore, Cd 0 . 8 Zn 0 . 2 S@MIL-101(Cr) possessed excellent stability during photodegradation and exhibited good reusability. The remarkable photocatalytic performance of Cd 0 . 8 Zn 0 . 2 S@MIL-101(Cr) is likely due to the effective transfer of electrons and holes at the heterojunction interfaces.
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CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Rui Zhao,Yanzi Li,Bolun Sun,Shen Chao,Xiang Li,Ce Wang,Guangshan Zhu
Dye pollution in water environment is a significant threat to ecological and human health, and its removal is very important yet challenging. Magnesium silicate-based materials have proven to be good adsorbents for dye wastewater treatment. In consideration of recycling and practicability, flexible and robust magnesium silicate fiber membrane (MgSiFM) is prepared for the first time via hydrothermal reaction using electrospun flexible SiO 2 fiber membrane as silicon template. The preparation process is efficient, low cost and easy to scale-up. MgSiFM shows high tensile strength (5.52 MPa) and good mechanical stability. Moreover, the BET surface area of MgSiFM is measured as 463.4 m 2 /g, which is similar to the reported powdery magnesium silicate-based materials. As expected, MgSiFM shows excellent adsorption capacity of 609.75 mg/g for cationic dye methylene blue (MB) with good recyclability. In particular, unlike powdery MgSi adsorbents, MgSiFM could act as a filter membrane for continuous and fast MB removal. The filtration performance is better than commercial nylon-6 microfiltration membrane and MgSi coated electrospun polymer fiber membrane. This work demonstrates a novel and facile strategy for the preparation of flexible magnesium silicate fiber membrane, which exhibits promising potential in practical wastewater treatment.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Shuangzhen Guo,Hongchao Xu,Fan Zhang,Xixi Zhu,Xianlong Li
A novel magnetic silica gel (Fe 3 O 4 -Si-COOH) adsorbent was successfully prepared and used to removal methylene blue (MB) from aqueous solution by adsorption method. Several techniques, including scanning electron microscope (SEM), transmission electron microscope (TEM), thermo-gravimetric analyzer (TGA), fourier transform infrared (FTIR), nitrogen physisorption and vibrating sample magnetometer (VSM), were used to characterize the adsorbent. Batch experiments were conducted to investigate the MB adsorption performance of Fe 3 O 4 -Si-COOH. The maximum adsorption efficiency of MB appeared at pH 11.0. The adsorption equilibrium was reached within 60 min and commendably described by pseudo-second-order model, and Langmuir model fitted the adsorption isotherm better. The maximum adsorption capacity can reach to 246.31 mg/g. Moreover, thermodynamic parameters including enthalpy (ΔH), free energy (ΔG) and entropy (ΔS) were also investigated and revealed that the adsorption process was spontaneous and endothermic in nature. Desorption and repeatability studies showed that Fe 3 O 4 -Si-COOH could still maintain about 76% in the fifth consecutive adsorption-regeneration cycle. Above the results showed that Fe 3 O 4 -Si-COOH was a promising adsorbent in environment pollution cleanup.
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CARBOHYDRATE POLYMERS
·
2019
·
IF 6.044
Jun Nie,Chen-yu Li,Ze-yuan Jin,Wen-ting Hu,Jia-hao Wang,Ting Huang,Yong Wang
In this work, cuprous oxide (Cu 2 O) particles and graphene oxide (GO) nanosheets were simultaneously incorporated into the microcrystalline cellulose (MCC) foam to fabricate the MCC/Cu 2 O/GO composite foam toward methylene blue (MB) photocatalytic degradation. The interaction between Cu 2 O and GO and the morphologies of the composite foams were investigated. The results showed that there was a hydrogen bonding interaction between Cu 2 O and GO, which promoted the exfoliation of GO nanosheets and the dispersion of Cu 2 O in the composite foam. The MCC/Cu 2 O/GO composite foams not only exhibited high photocatalytic degradation ratio toward MB compared with the pure Cu 2 O particles and the common MCC/Cu 2 O composite foams, but also exhibited much higher derogation rate compared with the Cu 2 O-based photocatalytic degradation materials as reported in literature. A concept of ‘micro-reactor’ was proposed to explain the mechanisms for the largely enhanced degradation rate. Furthermore, the cycling measurements for the photocatalytic degradation of MB was also evaluated.
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