JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Bo Chen,Yangrui Cao,Huinan Zhao,Fengxia Long,Xiang Feng,Juan Li,Xuejun Pan
Herein, a novel Fe 3+ -stabilized magnetic polydopamine composite (Fe 3 O 4 /PDA-Fe 3+ ) was facilely constructed, systematically characterized, and subsequently applied for the first time as a versatile adsorbent for treatment of Methylene blue (MB) in complex wastewater. Results showed that as-prepared material had prominent adsorption ability toward MB in its single dye solution over a wide pH range (3–10) with q max value of 608.8 mg/g at 318 K. More interestingly, MB could be selectively captured by resulting adsorbent from mixed dye solutions (MB-cationic dye and MB-anionic dye) and complex aqueous solution with high ionic strength up to 0.5 mol/L NaCl. It was eventually revealed that the enhanced and selective adsorption of MB by as-resultant adsorbent was due to the synergistic effects between multiple uptake mechanisms. What's more, its adsorption efficiency toward MB in simulated wastewater still maintained higher than 80 % of its original uptake performance after several runs of adsorption-desorption. Additionally, it exhibited more superior uptake performance toward MB than commercial powder activated carbon (PAC) in column adsorption system. Thus, the outstanding sorption ability, unique capture selectivity, as well as excellent stability and recyclability for model wastewater endow it a promising candidate adsorbent for selective adsorption and separation of MB from complex wastewater.
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DIAMOND AND RELATED MATERIALS
·
2020
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IF 2.65
Peng-Gang Ren,Wenwei He,Zhong Dai,Xin Hou,Fang Ren,Yan-Ling Jin
In this work, nitrogen (N), sulfur (S) co-doped porous carbon nanoplate (A-MBCP) is successfully prepared from methylene blue (MB) by facile one-step carbonization and activation strategy. It is an efficient method to protect the environment and meet industrialization production. The obtained carbon nanoplate exhibits in-situ doping of N, S, high specific surface area (560.46 m 2 g −1 ), interconnected and hierarchical porous morphology, together with large interlayer spacing. This unique and complex micromorphology endows the A-MBCP electrode with superior electrochemical performance , including ultra-high specific capacitance of 302 F g −1 at 0.5 A g −1 and excellent capacitance retention of 77.82% at 10 A g −1 in 6 M KOH electrolyte. Furthermore, the assembled A-MBCP//A-MBCP symmetric supercapacitor displays outstanding energy density of 25 Wh kg −1 and power density of 8000 W kg −1 using Na 2 SO 4 as electrolyte. Also, the high capacitance retention of 98.6% and coulombic efficiency of 97.9% are achieved for the supercapacitor after 3000 cycles at 2 A g −1 in KOH electrolyte, implying its favorable electrochemical stability and charge/discharge reversibility . This novel preparation of high-performance supercapacitors from MB may further inspire the development of other carbon materials with heteroatoms doping applied in the energy storage application .
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高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 6
·3287-3300
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IF 4.21
Zhang Su-Feng,Li Hao,Hou Chen,Liu Li-Na,Wang Yang,Zhao Meng-Ke,Liang Chen
Abstract The treatment of dyes in wastewater is important to solve environmental problems. Advanced oxidation processes has been proved to be an effective treatment. In this work, a novel nanocomposite catalyst of ZIF-9@Fe 3 O 4 (cobalt-containing zeolitic imidazolate framework-9 coated Fe 3 O 4 nanocomposite) modified reduced graphite oxide (RGO) was prepared for the first time and coded as ZIF-9@CA-Fe 3 O 4 /RGO. Then, ZIF-9@CA-Fe 3 O 4 /RGO was immobilized on a cellulose membrane to obtain a composite membrane, which was used as a composite catalyst for activating peroxymonosulfate to degrade methylene blue (MB). The results demonstrated that the composite membrane could efficiently degrade approximately 96% of MB in 9 min without adjusting the initial pH and maintain good catalytic activity even after seven cycles. Furthermore, the composite membrane can be easily separated from the solution at the end of the reaction. This work indicates that the composite membrane has a broad application prospect in industrial applications. Graphic abstract
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ACS Omega
·
2020
·
IF 2.87
Jiaqi Cheng,Conghua Zhan,Jiahui Wu,Zhixiang Cui,Junhui Si,Qianting Wang,Xiangfang Peng,Lih-Sheng Turng
A new type of deacetylated cellulose acetate (DA)@polydopamine (PDA) composite nanofiber membrane was fabricated by electrospinning and surface modification. The membrane was applied as a highly efficient adsorbent for removing methylene blue (MB) from an aqueous solution. The morphology, surface chemistry, surface wettability, and effects of operating conditions on MB adsorption ability, as well as the equilibrium, kinetics, thermodynamics, and mechanism of adsorption, were systematically studied. The results demonstrated that a uniform PDA coating layer was successfully developed on the surface of DA nanofibers. The adsorption capacity of the DA@PDA nanofiber membrane reached up to 88.2 mg/g at a temperature of 25 °C and a pH of 6.5 after adsorption for 30 h, which is about 8.6 times higher than that of DA nanofibers. The experimental results showed that the adsorption behavior of DA@PDA composite nanofibers followed the Weber’s intraparticle diffusion model, pseudo-second-order model, and Langmuir isothermal model. A thermodynamic analysis indicated that endothermic, spontaneous, and physisorption processes occurred. Based on the experimental results, the adsorption mechanism of DA@PDA composite nanofibers was also demonstrated.
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ACS Applied Polymer Materials
·
2020
·
IF 0
Neng Hu,Chen Chen,Jun Tan,Weijia Wang,Chao Wang,Huiqing Fan,Jiping Wang,Peter Müller-Buschbaum,Qi Zhong
The enhanced adsorption of methylene blue in aqueous solutions is triggered by the phase transition of the thermoresponsive copolymer poly(di(ethylene glycol) methyl ether methacrylate-co-poly(ethylene glycol) methyl ether methacrylate) (P(MEO2MA-co-OEGMA300)) in alginate–Ca2+ hydrogels containing the photocatalyst graphitic carbon nitride (g-C3N4). The obtained hybrid alginate–Ca2+/P(MEO2MA-co-OEGMA300)/g-C3N4 hydrogels possess an interpenetrating polymer network (IPN) structure. The embedded g-C3N4 induces a porous structure, which not only significantly enhances the hydration ability but also improves the adsorption capability of methylene blue. The collapse of P(MEO2MA-co-OEGMA300) causes the hybrid IPN hydrogels to become more porous when the temperature is increased to its transition temperature (TT, 45 °C). Thereby, the adsorption capability is further enhanced. Absorption of 100% methylene blue in the aqueous solution can be achieved in 2 h, which is three times faster than that at 40 °C (below TT). As the TT of acrylate-based thermoresponsive polymers is correlated to the number of ethoxy groups in the side chains, the collapse temperature of thermoresponsive hydrogels can be easily adjusted to the desired temperature by simply changing the types and molar ratios of the monomers. Due to the embedded g-C3N4, all adsorbed methylene blue can be degraded after placing in ambient conditions and exposure to visible light for 12 h. Thus, the hybrid IPN hydrogels are well recyclable. Based on the capability of enhanced adsorption and reutilization, the hybrid alginate–Ca2+/P(MEO2MA-co-OEGMA300)/g-C3N4 IPN hydrogels can be used for the removal of dye pollutants from wastewater with high efficiency and good recyclability.
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RSC Advances
·
2019
·Vol. 9
·期 72
·42343-42350
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IF 3.049
Zhibing Yin,Nian Liu,Siyao Bian,Jihui Li,Shuying Xu,Yucang Zhang
Catalytic oxidative pyrolysis is a promising method for the preparation of highly adsorptive biochar by introducing oxygen-containing groups. Here, a K2FeO4-catalyzed oxidative pyrolysis was described for enhancing the adsorption capability of areca leaf biochar toward methylene blue at low temperature. It was shown that the maximum adsorption capacity of the biochar pyrolyzed at 200 °C was greatly improved from 122.67 to 251.95 mg g−1 with the catalysis of K2FeO4 due to the introduction of surface oxygen-containing groups. In addition, a high adsorption capability was observed over a wide pH range for the K2FeO4-modified biochar and nearly neutral pH was obtained after adsorption, further demonstrating the great advantages of K2FeO4-catalyzed oxidative pyrolysis. Mechanistic studies revealed that the adsorption of the pristine biochar was mainly determined by hydrogen bonding and electrostatic interaction. Whereas, the adsorption of the K2FeO4-modified biochar was attributed to cation exchange besides hydrogen bonding and electrostatic interactions.
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JOURNAL OF HAZARDOUS MATERIALS
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2019
·
IF 7.65
Dong Wen,Wentao Li,Jinrong Lv,Zhimin Qiang,Mengkai Li
This study investigated methylene blue (MB) degradation by the vacuum-ultraviolet/ultraviolet/persulfate (VUV/UV/PS) process using a mini-fluidic VUV/UV photoreaction system. Results show that MB degradation by the VUV/UV/PS process was significantly higher than that of the conventional UV/PS process, as the VUV photolysis of H 2 O and PS generated more reactive oxygen species (ROSs). HO • and SO 4 •− , identified as the main ROSs, were mostly consumed by dissolved organic carbon and Cl ‒ in real waters, respectively. Additionally, the impacts of solution pH and the concentrations of PS, humic acid, and inorganic ions (HCO 3 ‒ , Cl ‒ , NO 3 ‒ , SO 4 2‒ , Fe(II), and Fe(III)) were systematically evaluated. The solution pH significantly affected the photon absorption distributions, as well as the contributions of photolysis and oxidation to MB degradation, resulting in different variations in the degradation rate constant and total organic carbon removal ratio with increasing solution pH. At all tested pH levels (3.0–11.0), particularly under acidic conditions, HO and SO 4 − were two predominant contributors to MB degradation, while VUV and UV photolysis contributed more when the solution pH increased. This study provides a highly efficient process for organic pollutant removal, which could be applied in water treatment.
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LANGMUIR
·
2023
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IF 3.9
Junfeng Cheng,Chuanqi Bi,Xin Zhou,Dun Wu,Dong Wang,Chunlin Liu,Zheng Cao
Dye pollution has long been an ecological and human health issue. Activated carbon is considered to be the most promising material for dye adsorption. In this study, bamboo was used as a biomass precursor to produce activated carbon with a high specific surface area by the steam activation method. The physical activation reaction between water vapor and bamboo promotes the carbonization product to have a rich porous structure. The prepared activated carbon was investigated from the perspectives of surface morphology, elemental change, surface porosity, and surface functional groups using a variety of techniques. According to the Brunauer–Emmett–Teller analysis, the activated carbon has a high surface area (1273 m2/g) and a mesoporous structure (average pore size 3.1 nm). On this basis, the effect of activated carbon on the removal of methylene blue (MB) dye from aqueous environments was evaluated and optimized by response surface methodology (RSM). Key adsorption parameters include initial MB concentration (150–200 mg/L), adsorption time (5–120 min), adsorbent dosage (30–50 mg), adsorption temperature (5–50 °C), and solution pH (3–11). Box–Behnken design (BBD) was used for modeling and analysis. Kinetic and isotherm model studies show that pseudo-second-order model kinetics and Langmuir isotherm can better describe the process of MB dye adsorption. This study will provide new ideas for the preparation of bamboo-activated carbon and provide a model prediction basis for dye adsorption research.
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MATERIALS & DESIGN
·
2017
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IF 4.364
Xiu Liu,Lei Huang,Dengsong Zhang,Tingting Yan,Jianping Zhang,Liyi Shi
This work reports the synthesis of highly dispersed Mn-Co/RGO via a novel light driven approach having attributes of being green, facile and controllable, for the catalytic degradation of methylene blue (MB) in the presence of H 2 O 2 . The prepared catalysts were characterized by TEM, EDS , IR, XRD and XPS techniques. A synergy between RGO and Mn-Co species existed where the former helped in adsorption of MB and stabilization and dispersion of Mn and Co on the surface while the latter improved H 2 O 2 utilization by generating HO , which enhanced the decomposition of MB. It was found that O 2 •− and O 2 •− /HO • were the main radicals in post Mn/RGO and Mn-Co/RGO treatment, respectively. Both O 2 •− and HO • oxidized MB with a faster rate by the former, but its side reaction can hinder effective utilization of H 2 O 2 while the reverse was true for the latter. A 50 mg/L MB was completely decomposed within 15 min using 10 mg of Mn-Co/RGO. Thus the synergistic effect of RGO by adsorption MB and Co species avoiding the side reaction led to enhanced rate of MB decomposition.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Shiyue Hu,Junhong Liu,Xuanlan Luo,Qiqi Shen,Yu Qin,Haikun Hu,Jinhai Yuan,Shuangkou Chen,Di Xu
Currently, photocatalytic degradation is a fascinating technology due to its capability to treat escalating environmental problems by degrading chemicals like dyes and pharmaceuticals from wastewater. Herein, the hexagonal prism GQDs/h-MoO 3 composite photocatalyst was fabricated through a facile hydrothermal approach. The synthesized samples were identified by XRD , SEM, FT-IR, XPS , UV-Vis DRS , and PL technologies to study the crystal structure, morphology, surface chemical composition , and optical properties . The preparation circumstances of binary compounds, such as different GQDs (Graphene quantum dots) loading amounts, precursor solution pH, hydrothermal temperature, and hydrothermal time were optimized, also, and the photocatalytic activity of materials is determined by photodegradation of Methylene Blue in this approach, which systematically investigated the impact of operational conditions on the efficiency of the photocatalytic reaction. The results revealed that 10GQDs/h-MoO 3 has the best photocatalytic performance among competitors, which exhibited a high photodegradation efficiency (85.58%) of MB, and the rate was approximately 2.13 times greater than pristine h-MoO 3 . Moreover, the PL and EIS measurements proved the outstanding separation and migration ability of the photo-excited carriers of composite, which was attributable to the fact that GQDs can serve as electron transporters and acceptors to induce electron-hole separation efficiently. Finally, the free radical scavenging experiments confirmed that the primary active species was h + in the photocatalytic process, as well as a potential explanation for the improved photocatalytic activity of GQDs/h-MoO 3 photocatalysts was proposed.
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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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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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