JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2019
·Vol. 321
·期 3
·1093-1107
·
IF 1.186
Ma Zhili,Wang Yanfei,Liu Mouwu,Luo YiGe,Xie Xiaoqing,Xiong Zeng
Poly(cyclotriphosphazene-co-4,4′-diaminodiphenyl ether) crosslinked microspheres with active amino groups on the surface were prepared by one-step precipitation polymerization method. The as-prepared material were characterized by means of FTIR, XPS, XRD, EDS and SEM. The effects of pH, time of contact, dosage, initial concentration and temperature on the adsorption of uranium(VI) by the crosslinked microspheres were studied, and the adsorption mechanism was elucidated. Under the optimized adsorption conditions, the adsorption removal efficiency reached 97.03%. The experimental results fit the Langmuir isotherm model and adsorption processes comply with the pseudo-second-order kinetic model. Thermodynamic data revealed that the adsorption behavior of uranium(VI) on the microspheres was spontaneous and exothermic.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Jisuan Tan,Yuxin Xu,Qin Deng,Yingmei Li,Yanzhen Yin,Xingtang Liang,Yong Luo
This study investigated the transformation of an agricultural byproduct, pomelo peel, into an environmental purifier by crosslinking assisted surface amination process and its use in wastewater treatment application. Surface morphology and textural analysis showed that the functionalized surface-amidated pomelo peel (SA-PP) attained a lamellar structure with an average pore size of 6.52 nm and a specific surface area of 7.82 m² g −1 . Zeta potential measurements confirmed that SA-PP exhibits a positive surface charge within a pH range of 3–11. This surface characteristic facilitated the effective adsorption of anionic dyes by SA-PP, including amaranth red ( Q e = 497.15 mg g −1 ), methyl orange ( Q e = 247.93 mg g −1 ), bright blue ( Q e = 231.53 mg g −1 ), and lemon yellow ( Q e = 116.77 mg g −1 ), as well as heavy metal ions like hexavalent chromium (Cr(VI), Q e = 193.17 mg g −1 ). Further investigations on the adsorption of amaranth red and Cr(VI) indicated that SA-PP achieved equilibrium after 30 min. The process followed the pseudo-second-order and Langmuir isotherm models, indicating monolayer adsorption. The adsorption efficacy of SA-PP remained consistent across a wide range of pH levels. After five cycles, SA-PP was able to retain more than 60 % of its adsorption capacity, highlighting its potential as a sustainable, cost-effective, non-toxic, and biodegradable adsorbent for wastewater treatment applications.
研究领域:
环境科学
·
农业废弃物利用
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
·
2021
·Vol. 12
·期 1
·33
·
IF 4.146
Yulin Li,Ping She,Rundong Ding,Da Li,Hongtan Cai,Xiufeng Hao,Mingjun Jia
Polyacrylonitrile hollow nanospheres (HPAN), derived from the polymerization of acrylonitrile in the presence of polystyrene emulsion (as template), were modified by surface amination with ethylenediamine (EDA), and then used as support for loading Pd or PdCo nanoparticles (NPs). The resultant bimetallic catalyst (named PdCo0.2/EDA-HPAN) can efficiently catalyze the additive-free dehydrogenation of formic acid with very high activity, selectivity and recyclability, showing turnover frequencies (TOF) of 4990 h−1at 333 K and 915 h−1at 303 K, respectively. The abundant surface amino groups and cyano group as well as the hollow structure of the support offer a suitable environment for achieving high dispersion of the Pd-based NPs on the surface of EDA-HPAN, thus generating ultra-small bimetallic NPs (bellow 1.0 nm) with high stability. The addition of a small portion of Co may adjust the electronic state of Pd species to a certain extent, which can further improve their capability for the dehydrogenation of formic acid. In addition, the surface amino groups may also play an important role in synergistically activating formic acid to generate formate, thus leading to efficient conversion of formic acid to hydrogen at mild conditions.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2018
·
IF 2.746
Man Gao,Wei Liu,Xuran Wang,Yanyan Li,Peipei Zhou,Liwan Shi,Buxing Ye,Randy A. Dahlgren,Xuedong Wang
Herein, we investigated in detail the relationship between surface properties and extraction performance of virgin and amino-functionalized MIL-101s(Fe) for the extraction of 10 bisphenols (BPs) and their derivatives. These BPs were used as model contaminants due to their different hydroxyl groups and contrasting polarities. The differential sorption efficiencies for relatively polar BPs (BPF, BPE, BPA , BPB , BPZ, BPAP and BPP) lies in the formation of hydrogen-bonding between OH of target analytes and NH 2 of two MIL-101s(Fe). However, the surface properties of MIL-101(Fe) and NH 2 -MIL-101s(Fe), such as S BET and pore structure , determined the extraction recoveries for BPs derivatives (BADGE, BADGE·2H 2 O and BFDGE·2H 2 O) due to lack of OH in their molecular structures. NH 2 -MIL-101s(Fe) nanosorbent was successfully applied to the preconcentration/extraction of trace BPs and their derivatives by dispersive solid-phase extraction (DSPE) method. Following optimization of the main factors, recoveries for BPs ranged from 90.8 to 117.8% and their LODs were 0.016–0.131 μg L −1 in environmental waters. Experimental precisions based on relative standard deviations were 0.9–4.9% for intra-day and 1.3–7.6% for inter-day analyses, respectively. These findings provide important information on how to design and modify nanosorbents for highly efficient extraction of pollutants having contrasting polarities. Moreover, the newly developed NH 2 -MIL-101s(Fe)-based DSPE method has a good application prospect in pretreatment of trace pollutants in real-world waters.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER INTERNATIONAL
·
2018
·Vol. 67
·期 5
·535-543
·
IF 2.352
Yang Hu,Lihui Wang,Jie Shen,Guoqiang Jiang,Chengyou Kan
Using styrene (St) and N , N ′-dimethylaminoethyl methacrylate (DMAEMA) as raw materials, monodispersed P(St- co -DMAEMA) nanoparticles (NPs) were first prepared via semi-continuous emulsion polymerization, and using a stepwise acid–alkali post-treatment, porous P(St- co -DMAEMA) NPs were then obtained and used to adsorb heavy metal ions in aqueous phase. Results showed that the post-treatment conditions including temperature, initial pH and time of acid–alkali treatment had significant effects on the morphology of the porous P(St- co -DMAEMA) NPs, with higher temperature, more extreme pH condition and longer treatment time resulting in larger pores and volume swelling ratio. Under the optimized acid–alkali post-treatment conditions (60 °C, acid treatment at pH = 4.0 for 1 h and then alkali treatment at pH = 10.0 for 1 h), the obtained porous NPs had nearly 15 times the surface area and 1.5 times the amount of surface amino groups than the corresponding solid NPs. An analysis of the mechanism of metal ion adsorption on the porous NPs indicated that the adsorbed amount of metal ions was the result of synergistic effect of physical and chemical adsorption, which was closely related to the porous NP surface area, amount of surface of amino groups and the volume of the ions. © 2018 Society of Chemical Industry
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
危险品化学品经营许可证（带存储）