Russian Journal of Physical Chemistry A
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2024
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IF 0.7
Ding Yan,Guo Chuwen,Li Debo,Lv Maochao,Zhang Xiaowei,Gai Didi,Fu Binbin,Yang Shuairong,Zhao Peitao
Abstract This study aims to investigate the evolution law of the material properties of rice husk (RH) hydrochar under quantitative process water recycling (QPWR) and to evaluate the changes in the adsorption performance of biomass hydrochar to malachite green (MG) with QPWR. In this study, 6 groups of RH samples were subjected to hydrothermal carbonization (HTC) experiments at 220°C, respectively. Except for the first HTC, which did not contain QPWR, the subsequent 5 HTC experiments all included the 100 mL process water from the previous HTC. The results demonstrated that after using QPWR, the mass yield (MY) of hydrochar increased from 68.51% without QPWR to 75.51% in the third QPWR; The carbon content increased from 58.09% of no QPWR to 76.63% of the fifth QPWR. Meanwhile, the volatile content decreased slowly from 42.70% without QPWR to 39.75% under the fifth QPWR, while the ash content increased slightly from 20.94% without QPWR to 21.45% under the fifth QPWR. SEM analysis showed that QPWR was beneficial to the decomposition and degradation of RH in HTC and promoted the accumulation of intermediates on the surface of hydrochar. BET-specific surface area and pore volume determination confirmed that QPWR could increase slightly the specific surface area and pore volume of hydrochar. Besides, the hydrochar produced by each HTC was used to adsorb malachite green, respectively. The results showed that the QPWR enhanced the adsorption performance of hydrochar, and the Langmuir–Freundlich adsorption model was more suitable to fit the adsorption law. These results highlighted the potential of QPWR in improving the application of biomass hydrochar.
研究领域:
环境科学
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生物质能
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材料科学
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DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 26
·16090-16095
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IF 3.361
Heng-Fang Xiang,Jia-Kun Xu,Jiao Liu,Xin-Zhi Yang,Shu-Qin Gao,Ge-Bo Wen,Ying-Wu Lin
Synthetic dyes such as malachite green (MG) have a wide range of applications. Meanwhile, they bring great challenges for environmental security and cause potential damages to human health. Compared with traditional approaches, enzymatic catalysis is an emerging technique for wastewater treatment. As alternatives to natural enzymes, artificial enzymes have received much attention for potential applications. In previous studies, we have rationally designed artificial enzymes based on myoglobin (Mb), such as by introducing a distal histidine (F43H mutation) and creating a channel to the heme pocket (H64A mutation). We herein show that the artificial enzyme of F43H/H64A Mb can be successfully applied for efficient biodegradation of MG under weak acid conditions. The degradation efficiency is much higher than those of natural enzymes, such as dye-decolorizing peroxidase and laccase (13–18-fold). The interaction of MG and F43H/H64A Mb was investigated by using both experimental and molecular docking studies, and the biodegradation products of MG were also revealed by UPLC-ESI-MS analysis. Based on these results, we proposed a plausible biodegradation mechanism of MG. With the high-yield of overexpression in E. coli cells, this study suggests that the artificial enzyme has potential applications in the biodegradation of MG in fisheries and textile industries.
研究领域:
环境科学
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生物化学
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DOI
PubMed
高影响因子
MINERALS ENGINEERING
·
2019
·
IF 3.315
Peilun Shen,Dianwen Liu,Xiaolin Zhang,Xiaodong Jia,Kaiwei Song,Dan Liu
Malachite is depressed during sulfidization flotation when excess sodium sulfide is added to it. Thus, this study investigated the role and mechanism of ammonium sulfate as a sulfidization promoter for eliminating the depression of excess S 2− via micro-flotation experiments, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy coupled with energy-dispersive spectroscopy (SEM-EDS), and inductively coupled plasma mass spectrometry (ICP-MS). Micro-flotation experiments revealed that malachite changed from a non-floating state to an easily floating state by (NH 4 ) 2 SO 4 addition prior to sulfidization with xanthate as the collector. The solution chemical reactions involving (NH 4 ) 2 SO 4 are the key to re-floating malachite. The surface properties of malachite were changed by (NH 4 ) 2 SO 4 , and these changes enhanced its flotation behavior. However, (NH 4 ) 2 SO 4 was not adsorbed onto the malachite surface in any form, as confirmed by the XPS analysis. (NH 4 ) 2 SO 4 has a dissolution on the malachite surface, causing lattice imperfections, which, in turn, provided the conditions necessary for subsequent adsorption of Cu(NH 3 ) n 2+ , S 2− (SH − ), and Cu 2+ on the malachite surface. Consequently, a layer or multilayer copper sulfide hydrophobic film formed on the malachite surface. Even the low-activity cylindrical surface of malachite was also covered with a stable copper sulfide film, resulting in improved malachite flotation in the presence of excess Na 2 S.
研究领域:
矿物加工工程
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化学工程
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产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
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2019
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IF 3.327
Hongli Fan,Jingqin Qin,Jun Liu,Guangyi Liu,Xianglin Yang
The flotation response of malachite, calcite and quartz to bis (2-ethylhexyl) phosphate (DEHPA), dibutyl phosphate (DBP) and tributyl phosphate (TBP) was evaluated by micro-flotation experiments. The results showed that DEHPA exhibited an impressive flotation selectivity for malachite against calcite/quartz in the pH range of 6.0–9.0 and achieved superior malachite flotation recovery over DBP and TBP. The flotation mechanism of DEHPA to malachite was farther investigated through adsorption, contact angle, zeta potential, Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The findings inferred that DEHPA reacted with the surface copper atom of malachite via its O atoms of P OH and P O to form the hydrophobic surface complexes of Cu(II)-DEHPA. The double active center of the P( O)OH group might be contributed to the stronger affinity of DEHPA and DBP to malachite than that of TBP with the single active center of the P O group. TBP returned the lowest malachite recovery among the three phosphate surfactants, even it has more hydrophobic-carbon atoms than those of DBP.
研究领域:
矿物加工工程
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表面化学
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产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Xinyang Yu,Ruirui Zhang,Yuhui Zeng,Chen Cheng,Zhiqiang Huang,Jinliang Wang,Guichun He,Haolin Wang
This study presents the use of Cinnamic Hydroxamic Acid (CHA) as a novel collector of malachite. The flotation performance was evaluated by microflotation experiments. The mechanism of CHA adsorption at malachite surfaces was studied by contact angle measurements, zeta potential measurements, infrared spectroscopy (FTIR), and X-ray Photoelectron Spectroscopy (XPS). The microflotation experiments demonstrated that the CHA improved selectivity in comparison to benzohydroxamic acid (BA) during malachite flotation. Artificial mixed mineral flotation experiments verified that malachite could be separated from calcite effectively with the CHA collector. The results from contact angle measurements indicated that the hydrophobicity of the malachite surface was increased after CHA treatment. Zeta potential and infrared spectroscopy measurements implied that the adsorption of CHA at malachite. XPS analysis demonstrated that the C and N concentration on the malachite surface increased, with a concomitant decrease in Cu concentration.
研究领域:
矿物加工工程
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表面化学
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产品关联
DOI
高影响因子
FOOD CHEMISTRY
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2016
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IF 4.052
Zheng-zhong Lin,Hong-yuan Zhang,Ai-hong Peng,Yi-dong Lin,Lu Li,Zhi-yong Huang
Magnetic molecularly imprinted polymers (MMIPs) were synthesized through precipitation polymerization using malachite green (MG) as template, methacrylic acid as monomer, ethylene dimethacrylate as crosslinker, and Fe 3 O 4 magnetite as magnetic component. MMIPs were characterized by scanning electron microscopy, Fourier transform infrared spectrometry, and vibrating sample magnetometry. Under the optimum condition, the MMIPs obtained exhibited quick binding kinetics and high affinity to MG in the solution. Scatchard plot analysis revealed that the MMIPs contained only one type of binding site with dissociation constant of 24.0 μg mL −1 . The selectivity experiment confirmed that the MMIPs exhibited higher selective binding capacity for MG than its structurally related compound (e.g., crystal violet). As a sorbent for the extraction of MG in sample preparation, MMIPs together with the absorbed analytes could easily be separated from the sample matrix with an external magnet. After elution with methanol/acetic acid (9:1, v/v), MG in the eluent was determined by high-performance liquid chromatography coupled with UV detector with recoveries of 94.0–115%. Results indicated that the as-prepared MMIPs are promising materials for MG analysis in aquatic products.
研究领域:
分析化学
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食品安全
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Ruihao Tang,Wei Hong,C. Srinivasakannan,Xuelin Liu,Xin Wang,Xinhui Duan
Silica aerogel and Fe doped silica aerogel composite were synthesized by sol–gel method adopting ambient pressure drying method. The crystal structure, surface morphology, pore structure, surface functional groups and elemental composition of silica aerogel prepared with different concentrations of Fe 3+ were characterized by XRD, SEM, TEM, BET, FTIR, XPS and Zeta potential analysis. The specific surface area of the composite aerogel was found to decrease with the increase addition amount of FeCl 3 . The optimal composite aerogel adsorbent had a surface area of 240 m 2 /g with well-developed mesoporous network, which possessed a maximum malachite green(MG) adsorption capacity of 1592 mg/g, as compared to virgin silica aerogel of 1250 mg/g. Adsorption capacity for large molecules like MG is very low for the most popular adsorbent such as high surface area activated carbon, which is usually the first-choice adsorbent for wastewater treatment. Such high adsorption capacitiy of the silica aerogel composite is highly promising as it is on the classification of low-cost adsorbents, which can serve to be far better alternative for waste water treatment applications.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
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IF 5.518
Bin Yan,Xiaoyu Wang,Xiaoling Zhang,Shengqu Liu,Honglang Lu,Rong Ran
In this study, hydroxyapatite (HAp) nanorods were prepared by a simple hydrothermal method and hydrophobically modified with lauric acid (LA). Modified HAp and magnetic triiron tetraoxide (Fe 3 O 4 ) nanoparticles as emulsifiers were loaded on polycaprolactone (PCL) microspheres by Pickering emulsion template method. The structure, composition and morphology of prepared HAp and m-RHAp-PCL microspheres were characterized by IR, XRD , SEM and TGA . Furthermore, the adsorption capacity of pure HAp and m-RHAp-PCL microspheres was investigated by malachite green (MG) as a model dye. The results showed that the adsorption processes of pure HAp and m-RHAp-PCL microspheres correlated better with the Langmuir isothermal adsorption curve. The maximum adsorption capacity of m-RHAp-PCL microspheres was 609 mg/g, and the relative adsorption capacity of HAp on microspheres was higher than that of pure HAp, indicating its greater adsorption potential for MG. The values of R L and 1/n indicated that the adsorption process was spontaneous. The adsorption kinetic data of samples was in good agreement with the pseudo-second-order kinetic model. In addition, the adsorbent could be easily recovered under magnetic fields. The removal ability of MG was retained after four cycles, which demonstrated the excellent reusability and stability of m-RHAp-PCL microspheres for MG adsorption from aqueous as a potential adsorbent candidate material.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2018
·
IF 2.707
Zhili Li,Feng Rao,Mario A. Corona-Arroyo,Arnoldo Bedolla-Jacuinde,Shaoxian Song
In this research, malachite particles with different roughness values were produced by grinding malachite sample together with quartz (mohs hardness: 7) and montmorillonite (mohs hardness: 1–2), respectively. Micro-flotation results showed that higher recovery was achieved by using malachite particles of higher surface roughness as feed. The contact angle measurements demonstrated that the contact angle of natural malachite surface decreased with the increase of its surface roughness, while the contact angle of malachite conditioned with 5 × 10 −5 mol/L sodium oleate increased with the increase of its surface roughness. It might be concluded that grinding media can influence minerals surface roughness, thus affecting the wettability of their surface and, consequently, the flotation performance.
研究领域:
矿物加工工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2023
·
IF 8.8
Kangkang Wang,Yuli Kou,Kefu Wang,Siqi Liang,Changyan Guo,Wei Wang,Yi Lu,Jide Wang
Microplastics (MPs) and dye pollutants are widespread in aquatic environments. Here, the adsorption characteristics of anionic dye methyl orange (MO) and cationic dye malachite green (MG) on polyamide 6 (PA6) and polyamide 66 (PA66) MPs were investigated, including kinetics, isotherm equilibrium and thermodynamics. The co-adsorption of MO and MG under different pH was also evaluated. The results reveal that the adsorption process of MO and MG is suitably expounded by a pseudo-second-order kinetic model. The process can be characterized by two stages: internal diffusion and external diffusion. The isothermal adsorption equilibrium of MO and MG can be effectively described using the Langmuir model, signifying monolayer adsorption. Furthermore, the thermodynamic results indicated that the adsorption was spontaneous with exothermic and endothermic properties, respectively. The results of binary systems reveal that MO dominates the adsorption at low pH (2–5), while MG dominates at high pH (8–10). Strong competitive adsorption was observed between MO and MG in neutral conditions (pH 6–8). The desorption experiments confirm that PA6 and PA66 could serve as potential carriers of MO and MG. The interaction between dyes and polyamide MPs is primarily mediated through hydrogen bonds and electrostatic attraction. The results reveal that PA6 formed more hydrogen bonds with the dyes, resulting in higher adsorption capacity than that of PA66. This difference can be attributed to the disparities in the synthesis process and polymerization method. Our study uncovered the adsorption mechanism of dye pollutants on PA6 and PA66, and provided a more comprehensive theoretical basis for the risk assessment concerning different types of polyamide MPs in aquatic environments.
研究领域:
环境科学
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化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL PAPERS
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2024
·
IF 2.1
Guo Jinxiu,Kong Tao,Zhang Huaijie,Ma Runtian,Ma Zijun,Hu Bing
The development of rapid and sensitive malachite green (MG) detection methods is particularly important for food safety supervision and ecological protection. Using fulvic acid (FA) as a stabilizer and NaBH 4 as a reducing agent, ellipsoidal gold nanoparticles (AuNPs) with the average particle size of 5–20 nm were successfully prepared. Based on the interaction between fulvic acid protected gold nanoparticles (FA-AuNPs) and MG, the color change of FA-AuNPs from ruby red to blue was observed, the corresponding absorbance ratio change of gold nanoparticles at 611 nm and 529 nm (A611/A529) was also studied. Through the optimization of experimental conditions, the linear relationship between A611/A529 with the concentration of MG was established. The detection limit and linear range of this method were 0.02 μM and 0.04–2 μM, respectively. This method was successfully applied to detect malachite green in three different water samples with the recovery of 97.4–110.8%. Graphical abstract
研究领域:
分析化学
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环境科学
·
食品安全
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产品关联
DOI
高影响因子
Materials
·
2018
·Vol. 11
·期 8
·1407
·
IF 2.467
Siji Chen,Shanshan Tang,Yang Sun,Gang Wang,Huan Chen,Xiaoxiao Yu,Yingjie Su,Guang Chen
A porous carbon material was prepared from quinoa husk (QH) by carbonization and chemical activation with KOH. A series of experiments, including SEM (Scanning electron microscopy), FT-IR (Fourier transform infrared), XRD (X-ray diffraction), Raman, X-ray photoelectron spectroscopy (XPS), and N2adsorption/desorption, were carried out on the porous carbon produced from quinoa husk (PC–QH). The results showed that PC–QH was mainly composed of activated carbon and graphite. Moreover, PC–QH exhibited a high level of porosity with a BET (the Brunauer–Emmett–Teller theory) surface area of 1713 m2g−1. As a representative dye, malachite green (MG) was selected to evaluate the performance of PC–QH to absorb the contaminants in dyeing wastewater. In batch adsorption experiments, PC–QH exhibited a high adsorption rate toward malachite green (MG). An uptake capacity of 599.90 mg g−1was achieved in the initial 5 min, and the MG adsorption capacity of PC–QH reached 1365.10 mg g−1, which was higher than many other adsorbents. The adsorption data were well fitted with the Freundlich isotherm model and the pseudo-second-order kinetic model. PC–QH also displayed a high absorption rate to rhodamine B (RhB), methyl violet (MV), methylene blue (MB), and methyl orange (MO). The results in this study suggest that PC–QH can be a promising adsorbent for quick treatment of dyeing wastewater.Keywords:quinoa husk;porous carbon;adsorption;malachite green;water treatment
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）