Journal of Nanoelectronics and Optoelectronics
·
2018
·Vol. 13
·期 12
·1807-1815
·
IF 1.069
Wang Zheng,Wang Yan-Shi,Tong Zhuang,Deng Qin,Luo Sheng-Xu
This paper reports the formation of novel adsorbent material based on undulating venus shell (UVS), white conch shell (WCS), conus conch shell (CCS) and abalone shell (AS). These absorbent materials were prepared by grinding the shells followed by high-temperature calcination process.
The prepared adsorbents were well characterized by scanning electron microscopy (SEM), X-ray diffraction and Fourier transform infrared (FTIR) spectroscopy. Further, the effects of adsorbent dosage and temperature on the adsorption of Cd2+ by shell powder and related adsorption
isotherms were evaluated. The results indicated that the amount of adsorbent and temperature have a great influence on the adsorption process of the four adsorbents. Under optimized conditions, the four shell powders exhibited strong adsorption properties of Cd2+ which was consistent
with the Freundlich isotherm adsorption model. The optimal conditions for preparing shell powder adsorbents with the best adsorption performance were determined by evaluating the particle size, calcination temperature and calcination time during the preparation process and the prepared materials
were characterized by several techniques. The results demonstrated that the particle size of UVS powder was over 140 mesh at 450 °C with activation time of 60 min. Furthermore, the UVS powder exhibits apparent porous morphology after calcination and thus the specific surface area was markedly
increased. Consequently, the adsorption performance was significantly improved.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 21
·59554-59566
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IF 5.8
Ma Xiao-Yan,Xie Qing-Qing,Hadiya Ablat,Xamsiya Nurmamat,Zhao Zhi-Xi
Dimethyl arsonic acid, the most common organic arsenic pollutant, is widely present in the environment and seriously threatens the safety of drinking water. Syntheses of magnetite, magnetic bentonite, and magnetic ferrihydrite via hydrothermal methods, and the magnetic composites were examined using XRD, BET, VSM, and SEM. SEM images revealed that many monodispersible pellets were attached to the surface of magnetic bentonite. The magnetic ferrihydrite contained abundant pores and had a rich pore structure, which expanded the specific surface area of the original magnetite. The specific surface areas of the magnetic bentonite and magnetic ferrihydrite were 65.17 and 220.30 m 2 ·g −1 , respectively. The adsorption kinetics and adsorption isotherms of dimethyl arsonic acid on magnetic composites were studied. The adsorption of dimethyl arsonic acid on the magnetic composites conformed to the pseudo-second-order model and Freundlich isothermal adsorption model. By comparing the isotherms of the adsorption of dimethyl arsonic acid by the magnetic composites at pH values of 3, 7, and 11, respectively, it was found that the adsorption of dimethyl arsonic acid was the greatest at neutral pH of 7. The adsorption mechanism was analyzed via zeta potential determination, Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). The zeta potential results revealed that magnetic bentonite electrostatic activity occurred with dimethyl arsonic acid, and the magnetic ferrihydrite indicated a coordination complex with dimethyl arsonic acid. The XPS results revealed that the Fe–O bonds on the surfaces of the magnetic ferrihydrite had coordination complexation effects on the As-O of the dimethyl arsonic acid.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
BIORESOURCE TECHNOLOGY
·
2020
·
IF 7.539
Junfeng Chen,Hanwen Hu,Junhan Yang,Hanhan Xue,Yuping Tian,Keyan Fan,Zhixin Zeng,Jiaqi Yang,Renjun Wang,Yanyan Liu
A novel macro-architectures material Fe 3 O 4 -N-GO@sodium alginate (SA) gel film was successfully produced, which was used to remove series azo dye wastewater. The optimal adsorption rates were attained, which achieved the maximum removal efficiency of 74.22%, 45.72%, 37.75% for Congo Red, Acid Orange 7 and Amino Black 10B respectively, under the condition that the mass ratio of Fe 3 O 4 -N-GO to sodium alginate was 0.11. The optimal adsorption temperature for three dyes was 30 ℃ and the adsorption equilibrium was reached at 150 min. The adsorption kinetic model of Fe 3 O 4 -N-GO@SA for the three azo dyes conformed to the quasi-second-order reaction model, and the adsorption isotherm was more in line with the Freundlich adsorption. The adsorption mechanism was multi-layer heterogeneous adsorption under the combined action of physical adsorption and chemisorption, and chemisorption was the main step of controlling the speed. The study would provide theoretical basis for the application of macro-architectures material in environment.
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
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2023
·Vol. 111
·期 3
·1-8
·
IF 2.7
Hu Xin,Zheng Fengmian,Yin Li,Huang Heyong,Li Shiyin
Colloidal particles, mixture with continuous molecular weight distribution and multiple organic components, is widespread in lake and have significant impact on the retention, migration, transportation, and fate of contaminants in lake ecosystems. Here we extract sedimentary colloids from algal growth dominant area (AD) in Taihu Lake and further separated into four different particle size ranges by cross-flow ultra-filtration (CFUF). The interaction mechanism between colloids and Microcystin-LR (MC-LR) was investigated under different cation conditions by dialysis equilibrium experiment method. Adsorption kinetics research shows the adsorption of MC-LR by colloids follows second-order kinetics and can be simulated by Freundlich isotherms. The effects of different cations on colloids-MC-LR interaction shows the addition of Mg(II) decreased colloids-MC-LR interaction, while Cu(II) increased colloids-MC-LR binding. MC-LR also increased Cu(II) binding to colloids, while MC-LR decreased Mg(II) binding. Therefore, different effect of cations to colloids-MC-LR interaction was proposed.
研究领域:
环境化学
·
胶体与界面科学
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毒理学
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水生态学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY
·
2018
·Vol. 29
·期 2
·334-342
·
IF 1.444
Tang Xiaosheng,Tang Ping,Liu Liangliang
In this study, tetraethylenepentamine modified magnetic graphene oxide nanomaterial (TMGO) was prepared and characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and vibration sample magnetometer (VSM). All the characterizations proved that the modification and preparation of TMGO were successful. The TMGO nanomaterial was used in the adsorption of Acid Red 18 (AR) in aqueous solution. The parameters like pH of solution, adsorption kinetics and isotherms were all investigated. The results indicated that the TMGO nanomaterial had satisfied adsorption ability and the maximum adsorption capacity was 524.2 mg g -1 at 45 °C and pH 6. The adsorption capacity remained at 91.8% of the initial value after five cycles. The adsorption process with AR was found through fitting the pseudo-second-order kinetics equations and the Freundlich adsorption model. The experimental results demonstrated that the TMGO nanomaterial could be rapidly extracted from the medium and had a good adsorption ability to remove dyes in 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
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2020
·
IF 0.936
Hai XU,Pan ZHANG,Shao-Yan ZHOU,Qiong JIA
A magnetic molecularly imprinted polymer (MIP) was synthesized for the adsorption of methylene blue (MB). Magnetic particles were fabricated with fullerenes, which increased the surface area and provided a delocalized π-conjugate structure to enhance the hydrophobicity. A novel functional monomer with double carboxyl groups was designed based on the substituent reaction of methacryloyl chloride and iminodiacetic acid. The magnetic surface MIP was obtained with the functional compound as monomer, MB as template, and 2-vinylbenzene as crosslinker. The maximum adsorption amount was calculated to be 41.5 mg/g. The adsorption isotherm results revealed that this enrichment process followed Freundlich isotherm model and the adsorption kinetics could be well described with pseudo-second-order equation. The adsorption behavior was multilayer and mainly driven by chemical adsorption.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
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