Desalination and Water Treatment
·
2015
·
IF 1.173
Ling Li,Li Jun Yuan,Wei Hong,Lu Fan,Le Bao Mao,Li Liu
The adsorptions of methylene blue (MB) and methyl violet (MV) from an aqueous solution of Fe3O4/metal-organic frameworks (MOFs) composite were studied in view of the adsorption isotherm, kinetics and regenerate of the sorbent. The adsorption isotherms of MB and MV on Fe3O4/MOFs composite both followed the Langmuir isotherm. Adsorption kinetics were determined from the experimental data. The used Fe3O4/MOFs could be regenerated by acetonitrile, so it can be recycled for use. The excellent adsorption effect and reusability make Fe3O4/MOFs attractive for the removal of MB and MV from aqueous solution. The feasibility of Fe3O4/MOFs for application in magnetic solid-phase extraction was examined.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 74
·70547-70552
·
IF 3.289
Qiu-Yun Chen,Dong-liang Huang,Yin-Bing Wang,Jian Shao,Ling-Ling Qu
The development of dye-loaded nanosorbcats can make best use of their advantages in removing dyes from wastewater, also bypassing their disadvantages. Herein, functionalized Fe2O3 nano-rods (pfa@Fe2O3) were synthesized by using tween-80 induced assembly of pyrrol-2-methanoic acid (pfa) and iron(III) salts, and characterized by FT-IR, XRD, EPR, and SEM. The pfa@Fe2O3 nanorods’ adsorption capacity for methylene blue (MB) was 450 mg g−1 compared to only 39 mg g−1 for α-Fe2O3. Moreover, the kinetics to reach equilibrium were approximately 0.5 h and the pfa@Fe2O3 nanorods can be used as efficient recyclable adsorbents for MB. In particular, the MB loaded MB@pfa@Fe2O3–water system could also be used as dioxygen generator when irradiated with red LED light (10 W). The light induced intramolecular charge transfer between catalysts and photosensitizers was more efficient in the MB@pfa@Fe2O3/H2O system, and it exerted higher activity for water oxidation than the traditional catalyst/Ru(bpy)32+ system. Control experiment results suggested that the α-Fe2O3 can’t be used as LED light driven catalysts for water oxidation. In conclusion, the MB@pfa@Fe2O3 nanorods were efficient recyclable nanosorbcats for LED-light-driven dioxygen generation using water as oxygen source.
研究领域:
材料科学
·
环境科学
·
光化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2015
·
IF 3.942
Pei Wu,Xuegang Luo,Sizhao Zhang,Ke Li,Fangwei Qi
A novel photo/thermocatalyst was synthesized using co-precipitation. The catalyst above was used to degrade the dye methylene blue (MB), via the processes of thermocatalytic degradation (TCD) and photo/thermocatalytic degradation (PTCD). The catalysts were characterized using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX), X-ray photoelectron spectroscopy (XPS), UV–Vis diffusion reflectance spectroscopy (DRS), diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), the Brunauer–Emmett–Teller (BET) technique, and the terephthalic acid photo-luminescence probing technique (TA-PL). Fe-doped Sr 2 Bi 2 O 5 powder was found to exhibit a high thermocatalytic activity and a high photo/thermocatalytic activity for the degradation of MB. The TCD and PTCD MB removal efficiencies reached 92.6 and 98.8%, respectively. Furthermore, HO and O 2 − were not found to be the predominant active radicals. Holes were found to be generated in both two TCD and PTCD; however, TA-PL and radical scavenger experiments indicated that more holes were formed in PTCD. This study discussed the probable thermocatalytic and photo/thermocatalytic mechanisms, finding them to be in good agreement with results.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Xianmiao Pan,Na Zhao,Hu Shi,He Wang,Fangtao Ruan,Hongjie Wang,Quan Feng
Removing textile dye by activated carbon adsorption from wastewater has become a focus issue owing to its easy operation, rapid adsorption ability, and relatively high removal efficiency. Biomass-based activated carbon is an excellent candidate due to its renewability and easy accessibility, but the biomass resources like peel and stem are usually with relatively long growth cycle and the removal efficiency within a wide pH range is relatively low. Thus, a biomass carbon source with a short growth cycle and activated carbon with high removal efficiency within a wide pH value needs to be explored. In this study, golden needle mushroom root-based activated carbon (GNMACs) activated by H 3 PO 4 was successfully prepared, characterized, and applied in methylene blue (MB) and methyl orange (MO) removal. The carbonization temperature (400 °C ∼ 600 °C), the GNMACs dosage (5 mg ∼ 25 mg), and the dye solution pH (4 ∼ 12) were controlled. The results indicated the optimal adsorption performance can be achieved with the carbonization temperature of 550 °C and the adsorbent dosage of 20 mg. The GNMACs carbonized at 550 ℃ possessed a porous structure with the mesopore volume of 1.095 cm 3 /g, the specific surface area of 802.987 m 2 /g, and the average pore diameter of 5.87 nm. Within a wide pH range from 4 to 12, GNMACs removed MB with an efficiency above 98.57 % and MO with an efficiency above 98.77 %. Additionally, the adsorption process of MB and MO onto GNMACs followed the pseudo-second-order kinetic model and the Redlich-Peterson isothermal adsorption model, with adsorption capacities of 816.04 mg/g and 286.99 mg/g, respectively. The adsorption was facilitated by hydrogen bonding, electrostatic attraction, π-π interaction, and pore filling. The results indicated the GNMACs can be used as an adsorbent to remove MB and MO from the wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Qin Shi,Jialve Zhang,Zhenjie Duan,Yanqing Wang,Yumin Wu,Yuetao Liu
With the rapid development of science and technology, the discharge of industrial wastewater, especially dye wastewater, has caused great harm to the ecological environment. In response to the pollution caused by cationic organic dyes in industrial wastewater, this study employed free radical polymerization to prepare a new hydrogel adsorbent, PAA-PA-CMC, which exhibits both reusability and a large adsorption capacity. Phytic acid (PA) and carboxymethyl cellulose (CMC) were introduced into the acrylic acid-based polymer network using N, N ‘-methylene-bisacrylamide (MBA) and glycidyl methacrylate (GMA) as cross-linking agents. Phytic acid serves as both a cross-linking agent and an active component in the adsorption of methylene blue cationic dyes. Methylene blue (MB) adsorption experiments demonstrated that PAA-PA-CMC possesses a porous structure and abundant functional groups, primarily utilizing hydrogen bonds and electrostatic interactions for efficient MB adsorption. The adsorption capacity of PAA-PA-CMC for MB can reach 1005.41 mg/g and has good reusability. After 5 cycles, its adsorption efficiency remains at about 85 %. The adsorption behavior of PAA-PA-CMC conforms to the pseudo-second-order kinetic model and the Langmuir isotherm adsorption model, which is a monolayer chemical adsorption. In summary, the PAA-PA-CMC hydrogel prepared in this investigation shows great potential for treating MB dye wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2024
·Vol. 17
·期 11
·2615
·
IF 3.1
Naveed Karim,Tin Kyawoo,Chao Jiang,Saeed Ahmed,Weiliang Tian,Huiyu Li,Yongjun Feng
The continuous discharge of organic dyes into freshwater resources poses a long-term hazard to aquatic life. The advanced oxidation Fenton process is a combo of adsorption and degradation of pollutants to detoxify toxic effluents, such as anti-bacterial drugs, antibiotics, and organic dyes. In this work, an activated attapulgite clay-loaded iron-oxide (A-ATP@Fe3O4) was produced using a two-step reaction, in which attapulgite serves as an enrichment matrix and Fe3O4functions as the active degrading component. The maximum adsorption capacity (qt) was determined by assessing the effect of temperature, pH H2O2, and adsorbent. The results showed that the A-ATP@Fe3O4achieves the highest removal rate of 99.6% under optimum conditions: 40 °C, pH = 3, H2O225 mM, and 0.1 g dosage of the composite. The dye removal procedure achieved adsorption and degradation equilibrium in 120 and 30 min, respectively, by following the same processes as the advanced oxidation approach. Catalytic activity, kinetics, and specified surface characteristics suggest that A-ATP@Fe3O4is one of the most promising candidates for advanced oxidation-enrooted removal of organic dyes.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Qi-Su Huang,Wei Wei,Jing Sun,Shun Mao,Bing-Jie Ni
In this study, novel hexagonal K2W4O13 (h-K2W4O13) nanowires were strategically synthesized via a facial hydrothermal method, which exhibited excellent adsorption capacities for wastewater treatment. The inorganic agent K2SO4 was used as a structure-directing agent to scaffold the tunnel structure of h-K2W4O13 and form the one-dimensional structure. Through increasing the relative molar ratio of K2SO4 to Na2WO4 precursor, the pure-phase h-WO3 nanorods and h-K2W4O13 nanowires were obtained, attributing to the competitive electrostatic adsorption between K+ ions and Na+ ions on h-WO3 nuclei. With a smaller hydrated radius in the solution (dK+ = 3.31 Å, dNa+= 3.58 Å), K+ exhibited superior affinity compared to Na+ with the negatively charged h-WO3 nuclei because of a larger charge density, resulting in the formation of h-K2W4O13. Adsorption experimental results showed that 89.4% of methylene blue was removed by h-K2W4O13 in the first 5 min (99% in 1 h) and the maximum uptake capacity reached 204.08 mg g–1. In addition, the novel h-K2W4O13 exhibited acid or alkali resistance and good reusability, revealed by the stable adsorption capacity in a wide pH range of 3.0–11.0 and five-run recycle tests. The large specific area, high proportion of effective pore volume, and abundant hydroxyl groups of the synthesized h-K2W4O13 resulted in excellent adsorption performance for methylene blue.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
Journal of Composites Science
·
2022
·Vol. 6
·期 2
·55
·
IF 0
Tao Wen,Baotao Huang,Li Zhou
Activated carbon (AC) has been widely utilized for the adsorption of pollutants from water. However, it is difficult to recycle the AC after adsorption. In this paper, we report a facile one-pot approach to fabricate magnetic poly(vinyl alcohol)/AC composite gel (mPVA/AC CG) by dropwise addition of an aqueous mixture of PVA, AC and iron ions into the ammonia solution. The obtained mPVA/AC CG after freeze-drying shows porous microstructure and favorable magnetic properties. The utilization of mPVA/AC CG for adsorptive removal of methylene blue (MB) and methyl orange (MO) dyes from water was investigated. The mPVA/AC CG not only exhibited good adsorption performance for both MB and MO dyes but also could be readily recycled using a magnet after adsorption. The adsorption process was well described by the pseudo-second-order kinetic model and the Langmuir isotherm model. Considering the simple fabrication process, good adsorption performance and favorable magnetic separation capability, this work provides a viable strategy for combining the features of AC and magnetic gel for fabrication of applicable magnetic adsorbent.Keywords:magnetic gel;activated carbon;adsorption;dye;methylene blue;methyl orange
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Haize Jin,Yuhang Zhang,Xingxing Zhang,Min Chang,Cuixia Li,Xuefeng Lu,Qikun Wang
Geopolymers have high application potential due to their outstanding ion exchange ability. A novel direct ink writing (DIW) geopolymer adsorption sieve (GAS) preparation strategy was proposed. The preparation and optimization of DIW inks and the adsorption properties and mechanism of GAS for methylene blue (MB) were systematically investigated by characterization and density functional theory (DFT) calculation. The GASs exhibited desired adsorption rates for MB in both dynamic (83.6% at 200 min) and static (97.1% in 7 days) states. The adsorption kinetic was fitted well by the pseudo-first-order model at the early stage and eventually was transformed to fit well by the pseudo-second-order model and indicated the boundary liquid layer diffusion and intraparticle diffusion were all rate-limiting factors. The exploration of adsorption mechanism confirmed that the adsorption of GAS for MB was affected by the coordination of electrostatic action, hydrogen bonds and electrons transfer . The proposed strategy provides a promising reference for design and preparation of eco-friendly 3D printing adsorbent systems.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Zhifang Zhang,Wenjun Gui,Jia Wei,Yanjun Cui,Ping Li,Zhilong Jia,Peng Kong
Attapulgite (denoted as APT, also called palygorskite) has been regarded as the green material in the “21st century world” and has attracted widespread attention due to its advantages of low cost, natural abundance, nontoxic nature, and environmental friendliness. However, the limited adsorption sites and surface charges of natural APT greatly hinder its application as an adsorbent in industrial fields. In this work, natural APT was modified with sodium humate (SA) via a facile one-step hydrothermal process to improve its adsorption capacity and systematically studied its ability to remove methylene blue (MB) from aqueous solutions. The effect of hydrothermal modification in the presence of SA on the microscopic structure, morphology, and physicochemical properties of APT was studied by field-emission scanning electron microscopy, Fourier transform infrared spectrometry, X-ray diffraction, and Brunauer–Emmett–Teller analyses. The adsorption properties of the modified APT toward MB were evaluated systematically. The results demonstrated that the modified APT has a high adsorption capacity of 227.27 mg/g and also shows a high removal rate up to 99.7% toward MB in a dye solution with an initial concentration of 150 mg/L, which was a 64.7% increase as compared to that of raw APT. The adsorption kinetics could be fitted to the pseudo-second-order model, while the adsorption isotherm could be well-described with the Langmuir model. It was concluded that electrostatic attraction, hydrogen-bonding interaction, and chemical association are the main driving force during the adsorption process.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Applied Nanoscience
·
2022
·Vol. 12
·期 12
·3995-4004
·
IF 3.869
Bao Li-hong,Wen Yu-xin,Ling Jia-wen,Guan Fang-lan,Nie Jin-mei,Zhang Mei
In this study, titanium dioxide (TiO 2 ) and graphene oxide (GO) were used to make a titanium dioxide/reduced graphene oxide (TG) composite under hydrothermal condition, and the TG composite was subsequently dye-sensitization (DTG). TEM, XRD, Raman, XPS, and UV–vis DRS spectroscopy were used to examine the structure and morphology of DTG, and the results revealed that the grafting rate of dye molecules on TG was approximately 20.4% and the band-gap value for TiO 2 , TG and DTG were 3.21, 3.03, 2.57 eV, respectively. The photocatalytic performances of DTG, TG, and TiO 2 were investigated under the illumination of a xenon lamp, and it was discovered that the final removal rates of MB by TiO 2 and TG were only 21.53% and 50.37%, but DTG can remove 97.67% of MB, the COD value of the effluent decreased by 88.24%. Furthermore, the elimination rate of MB maintained over 90% after 5 cycles of photocatalytic tests, indicating that DTG had good endurance.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 8
·3410
·
IF 4.6
Yuyu He,Liangmeng Ni,Qi Gao,Hao Ren,Mengfu Su,Yanmei Hou,Zhijia Liu
To effectively remove methylene blue (MB) from dye wastewater, a novel activated carbon (BAC) was manufactured through co-pyrolysis of bamboo shoot shell and K2FeO4. The activation process was optimized to a temperature of 750 °C and an activation time of 90 min based on its excellent adsorption capacity of 560.94 mg/g with a yield of 10.03%. The physicochemical and adsorption properties of BACs were investigated. The BAC had an ultrahigh specific surface area of 2327.7 cm2/g and abundant active functional groups. The adsorption mechanisms included chemisorption and physisorption. The Freundlich model could be used to describe the isothermal adsorption of MB. The kinetics confirmed that the adsorption of MB belonged to the pseudo-second-order model. Intra-particle diffusion was the main rate-limiting step. The thermodynamic study showed that the adsorption process was endothermic and temperature was beneficial for the improvement of adsorption property. Furthermore, the removal rate of MB was 63.5% after three cycles. The BAC will have great potential for commercial development for purifying dye wastewater.Keywords:bamboo shoot shell;activated carbon;adsorption process;methylene blue;K2FeO4
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）