JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2021
·Vol. 68
·期 9
·1739-1747
·
IF 1.967
Xiaoqing Wang,Jing Zhang,Zimeng Xu,Chen Rao,Leilei Pi,Yaqin Fu,Yubing Dong,Chen Shen,Lanying Yao,Chunhua Xiong
The MCTS-g-AT was developed as a novel magnetic adsorbent with core-shell structure. Its unique synthesis route endows MCTS-g-AT with green, convenient, economical and safe characteristics, and also good selective adsorption of Hg(II). The material was characterized using an appropriate set of spectroscopic and analytical techniques (SEM, EDS, XRD, VSM, FTIR, and TGA). Its adsorption kinetics fits the pseudo-secondary model well and adsorption isotherm fits the Langmuir equation well, suggesting the mechanism of chemisorption with monolayer adsorption. The results of the thermodynamic parameters indicate spontaneous and endothermic process. Column adsorption experiments showed that the maximum adsorption capacity of Hg(II) was 207.6 mg/g (298 K). Moreover, the Hg(II) adsorbed on composite microspheres was completely eluted by 3 mol/L HNO 3 or 4 mol/L HCl. Furthermore, MCTS-g-AT adsorption column combined with spectrophotometer can achieve more accurate detection of Hg(II) in aquatic products.
研究领域:
环境科学
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材料科学
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分析化学
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 14
·21430-21441
·
IF 0
Jiang Changjin,Zhang Shuang,Zhang Ting
Fe 3+ complexed with 3-aminopropyltriethoxysilane (APTES)-modified carboxymethyl chitosan (CMC) named Fe-ACMC was synthesized by a one-step method at room temperature and pressure. The surface morphology and chemical structure of Fe-ACMC were characterized by SEM-EDS, XRD, BET, FT-IR, XPS, and ζ-potential. In batch adsorption, the optimum pH for arsenate [As(V)] adsorption onto Fe-ACMC was 3–9 with removal efficiency > 99%. The adsorption of As(V) could reach equilibrium within 25 min and the maximum adsorption capacity was 84.18 mg g –1 . The pseudo-second-order model fitted well the kinetic data ( R 2 = 0.995), while the Freundlich model well described the adsorption isotherm of As(V) on Fe-ACMC ( R 2 = 0.979). The co-existing anions (NO 3 – , CO 3 2– , and SO 4 2– ) exhibited a slight impact on the As(V) adsorption efficiency, whereas PO 4 3– inhibited As(V) adsorption on Fe-ACMC. The real applicability of Fe-ACMC was achieved to remove ca. 10.0 mg L –1 of As(V) from natural waters to below 0.05 mg L –1 . The regeneration and reuse of Fe-ACMC for As(V) adsorption were achieved by adding 0.2 mol L –1 HCl. The main adsorption mechanism of As(V) on Fe-ACMC was attributed to electrostatic attraction and inner-sphere complexation between –NH 2 ···Fe 3+ and As(V). In fixed-bed column adsorption, the Thomas model was the most suitable model to elucidate the dynamic adsorption behavior of As(V). The loading capacity of the Fe-ACMC packed column for As(V) was 47.04 mg g –1 at pH 7 with an initial concentration of 60 mg L –1 , flow rate of 3 mL min –1 , and bed height of 0.6 cm. Graphical abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
RSC Advances
·
2014
·Vol. 4
·期 98
·55256-55262
·
IF 3.708
Zhijian Wu,Ya Xiong,Guoqiang Guan,Lingjun Kong,Shuanghong Tian
A new pyrolytic process was successfully used to prepare hollow-like spherical sludge chars (HSC). In the process, pre-formed cotton spheres with a low density were firstly coated by a layer of sludge paste containing ZnCl2 to form cotton fiber@sludge spheres and then pyrolyzed at 500 °C for 2 h. The resulting HSC possessed a diameter of about 3 mm, a low density of 0.1008 g cm−3 and a high surface area of 1008 m2 g−1. The column adsorption behavior showed that the adsorption capacity and rate constant of HSC for methylene blue reached 186.4 mg g−1 and 0.232 mL min−1 mg−1. The adsorption capacity is about 8.4 and 12 fold of the adsorption capacities of GAC (22.28 mg g−1) and SC (15.26 mg g−1), respectively, and the adsorption rate constant is about 1.3 fold of that of GAC and SC. The great adsorption capacity and rate constant can be considerably dependent on the special hollow-like spherical structure of HSC.
研究领域:
环境科学
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材料科学
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化学工程
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污染控制
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吸附技术
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DOI
高影响因子
WATER AIR AND SOIL POLLUTION
·
2025
·Vol. 236
·期 10
·1-20
·
IF 3
Hu Wei,Zhang Jun
This study investigated the adsorption characteristics of Cr(VI) and methyl orange (MO) onto polyethyleneimine (PEI) cryogels. The morphology and physicochemical properties of this prepared adsorbent were characterized with various techniques. Its adsorption behaviors towards MO and Cr(VI) were systematically investigated. In single-component systems, PEI cryogels exhibited significant adsorption capacities for Cr(VI) (875 mg/g) and MO (1777 mg/g), respectively. In binary systems, the cryogels demonstrated a stronger affinity for Cr(VI) than for MO. Column adsorption studies in single-component systems explored the effects of bed height, flow rate, and inlet concentration using breakthrough curves, with the modified dose–response model proving effective in describing these curves. Moreover, repeated dynamic adsorption experiments highlighted that the cryogels exhibited exceptional reusability. Results from column adsorption in binary systems indicated that the presence of MO did not significantly affect the adsorption of Cr(VI), while the presence of Cr(VI) enhanced the affinity of the cryogels for MO adsorption. The adsorption mechanism of PEI cryogels towards Cr(VI) primarily involved electrostatic attraction and reduction, whereas for MO, it predominantly entailed electrostatic attraction and hydrogen bonding. These findings collectively emphasize the significant potential of PEI cryogels for treating dyeing wastewater.
研究领域:
环境科学
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化学工程
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材料科学
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水处理技术
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产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Xu Wang,Shanghua Xing,Mingqian Tan
Separation of easily degradable bioactive compound of astaxanthin (AXT) from nature source with low content and several interfering carotenoid analogues is particularly challenge. Here, four mesoporous metal-organic frameworks (meso-MOFs) is reported with different pore chemistry and pore geometry of cage-type and channel-type feature for AXT adsorption and separation. The maximal adsorption capacities of AXT by cage-type PCN-777 and MIL-101-NH 2 are higher than channel-type PCN-222 and NU-1000, and their adsorption capacities (40–469.4 mg g −1 ) outperform previous benchmark and commercial materials (2.5–26.2 mg g −1 ). Particularly, NU-1000 achieved the optimal balance between high adsorption capacity (111.3 mg g −1 ), rapid adsorption kinetic (≈0.5 h), excellent AXT adsorption selectivity over other carotenoid as well as efficient release (86%) for AXT. In addition to the optimal pore geometry, its superior separation performance is driven by multi-sites electrostatic attraction coupling with van der Waals interactions, demonstrated by electrostatic surface potential analysis, density-functional theory calculations and spectroscopy analysis. The practical AXT separation potential from shrimp shell waste is validated by fixed-bed column sorption experiments with nearly 3 times enhancement in purity over initial crude extract. This work provides a new perspective for the development of advanced porous materials for sustainable production of bioactive compounds from nature source.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2022
·
IF 7.613
Y. Wei,R. Zou,Y. Xia,Z. Wang,W. Yang,J. Luo,C. Liu
Water remediation from arsenite [As(III)] is critical to environmental sustainability and human health. Metal-organic frameworks (MOFs) hold great promise for this purpose, while their efficient application requires addressing loading and activation issues. Herein, a new bionanocomposite bead UiO-66/CB was fabricated through simple gelation followed by the freeze-casting method for remediation of As(III)-contaminated water. Highly accessible UiO-66 nanoparticles are uniformly dispersed within the networking pores of the macroporous chitosan bead with high activity retention. Moreover, the fabrication strategy effectively activated the embedded UiO-66 nanoparticles, leading to improving the utilization efficiency of the active sites. The millimeter-sized UiO-66/CB-2.0 performed much more efficiently than the freely dispersed UiO-66 nanoparticles in removing As(III) and even exhibited comparable adsorption to the activated UiO-66 nanoparticles. The maximal sorption capacity of As(III) onto UiO-66/CB-2.0 was larger than 47.9 mg/g (88.6 mg As/g UiO-66) at pH 7. 1 g/L UiO-66/CB-2.0 can reduce As(III) levels (200 μg/L) in groundwater to below 10 μg/L. It could be readily regenerated and reused. Fixed-bed column adsorption by using UiO-66/CB-2.0 could treat ∼1600 bed volumes of As(III)-spiked groundwater to below 10 μg/L. This research provides a versatile route to fabricate high-performance and convenient MOFs biocomposite adsorbents for As(III) remediation.
研究领域:
环境科学
·
材料科学
·
纳米技术
·
水处理
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Meng Li,Chunxia Tang,Shaohai Fu,Kam Chiu Tam,Yongzhong Zong
The reduction and sequestration of toxic Cr(VI) via a one-step process in an aqueous solution is critical to eliminate its environmental risk. In this study, amine functionalized cellulose-based aerogel beads (CGP) was developed for simultaneous and efficient adsorption- reduction- sequestration of Cr(VI). CGP showed a maximum Cr(VI) adsorption capacity of 386.40 mg/g at 25 °C due to its strong electrostatic attraction towards Cr(VI). The simultaneous Cr(VI) adsorption- reduction- sequestration performance of CGP over a wide Cr(VI) concentration range was examined. The mechanism was investigated in-depth via the analysis of adsorption kinetics , XPS spectra, and FTIR spectra. Moreover, the Cr immobilization stability of CGP after adsorption was evaluated in simulated neutral, acidic, and alkaline conditions. The effect of pH, temperature, ionic strength and the presence of interfering ions on CGP adsorption performance were investigated by batch adsorption experiments. Fixed-bed column adsorption study was performed to explore the application potential of CGP beads in a wastewater treatment process.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
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