JOURNAL OF HAZARDOUS MATERIALS
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2015
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IF 4.529
Zailin Gong,Shujin Li,Jun Ma,Xiangdong Zhang
The commercial powdered activated carbon (PAC) has been selectively oxidized by two methods. The two oxidized methods are wet oxidation with ammonium persulfate and thermal treatment after acidification with hydrochloride acid, respectively. The two oxidized PAC were then functionalized with thermoresponsive poly ( N -isopropylacrylamide) (PNIPAM) in aqueous solution at ambient temperature. Comparing the two oxidized PAC products and their grafted derivatives, the oxidized PAC modified with thermal treatment after acidification shows larger surface area of 1184 m 2 /g and better adsorption of bisphenol A. Its derivative also exhibits relatively large surface area and adsorption capacity after grafted with PNIPAM. The maximum surface adsorption capacity simulated under Langmuir Models reached 156 mg/g. In addition, the grafted PAC products show self-flocculation behaviors with rapid response to temperature because of the thermal phase transition and entanglement behaviors of PNIPAM. The present study provides a new way to obtain carboxyl-rich activated carbon with large surface area and better adsorption capacity. The retrievable grafted PAC with good self-flocculation effect responsive to temperature will have high potential application in water remediation which requires pre-heating and emergency water treatment in the wild.
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
PubMed
高影响因子
Biomass Conversion and Biorefinery
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2023
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IF 4
Zhang Xian,Liu Ze,Khan Hafiz Ihsan Ul haq,Barati Bahram,Parakhonskiy Bogdan,Skirtach Andre G.,Rousseau Diederik P. L.,Van Hulle Stijn
Nitrogen source–modified biochar was produced from rice straw–derived biochar (RSBC) via pyrolysis carbonization using nitrogen sources such as ammonium chloride, dicyandiamide, melamine, thiourea, and urea. The characteristics of the resulting biochars were compared, including their elemental compositions, surface functional groups, and morphology. The N-modified biochar contained N- and O-based groups (N–H, C–N, C≡N, O–H, and C–O), primarily consisted of mesopores (3.01 ~ 14.42 nm pore diameter), and had a specific surface area ranging from 95.87 to 167.86 m2 g −1 . The N-modified biochar’s BPA adsorption capacity was correlated to the activation temperature (correlation coefficient n = 0.5), with adsorption capacities varying from 7.43 to 63.09 mg g −1 . Ammonium chloride–modified biochar synthesized at 800 °C had over twice the BPA adsorption capacity of pristine biochar (28.80 mg g −1 ) among various nitrogen sources evaluated. The pseudo-second-order model characterized the adsorption kinetics of BPA, while the Freundlich model faithfully captured its isotherms. This study emphasizes the significance of proper nitrogen source selection and optimal modification temperatures to enhance the BPA adsorption capacity of biochar. Graphical Abstract
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
CARBOHYDRATE POLYMERS
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2018
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IF 5.158
Xi Chen,Panyu Li,Yan Kang,Xiaotong Zeng,Yi Xie,Yongkui Zhang,Yabo Wang,Tonghui Xie
Hydrogels are emerging materials in pollutant treatment due to their high absorbability and environmental friendliness. Herein, a novel temperature-sensitive hydrogel based on xanthan gum (XG) and N-isopropylacrylamide (NIPA) was successfully synthesized in a water system using low-cost citric acid as crosslinking agent. The lower critical solution temperature of the honeycomb macroporous XG/NIPA hydrogels was 40 °C. Meanwhile, the hydrogels had good water-absorption capacity and the swelling degree reached up to 70.1. Using XG/NIPA hydrogels to absorb bisphenol A (BPA), the maximum adsorption capacity was as high as 458 mg/g. The process was a multilayer adsorption and the rate-controlling step is chemisorption. Thus, the temperature-sensitive XG/NIPA hydrogel had great potential in absorbing BPA from aqueous solutions.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Environmental Chemistry and Ecotoxicology
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2025
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IF 8.2
Xing-han Wang,Luo-lin Deng,Ke-yu Long,Tian-mi Wang,Ling-ling Yan,De-yu Tang,Qing-han Zhou
Various water pollutants, such as endocrine disruptors, dyes, and microorganisms pose significant threats to the ecosystem and human health. However, integrated treatment methods for these pollutants are still scarcely investigated, which greatly impedes the advancement of water treatment technology. In this regard, there is an urgent need for novel combined processing techniques capable of simultaneously removing different types of pollutants from wastewater. Herein, we synthesized a molecularly imprinted MOF/PVDF electrospinning nanofibrous membrane, which is designed for selective adsorption of bisphenol A (BPA), photocatalytic degradation of methylene blue (MB), and efficient inhibition against bacteria in treating wastewater. Firstly, the as-prepared MOF/PVDF molecularly imprinted polymer membrane (MOF/PVDF-MIM) exhibits a higher affinity for BPA compared to other model pollutants attributing to the molecular imprinting effect. The adsorption mechanism was also investigated, indicating that the pseudo-second-order kinetics and Langmuir isotherm model closely match the adsorption process of the MOF/PVDF-MIM on BPA. In addition, the MOF/PVDF-MIM demonstrates excellent photocatalytic performance towards MB, achieving a degradation rate of up to 95.2 % under simulated sunlight irradiation. Moreover, the as-prepared membrane shows enhanced structural stability after several rounds of adsorption-desorption or degradation cycle, with a high adsorption rate of 53.1 % for BPA and a photocatalytic efficiency of 66.6 % for dye pollutants. Finally, it is observed that the as-prepared membrane exhibits excellent bacterial inhibition rates (>99 %) against both Gram-negative and Gram-positive bacteria. In summary, the MOF/PVDF-MIM with outstanding performance in selective adsorption, photocatalytic degradation, and bacterial inhibition, can be potentially applied as an ideal filtration membrane for the combined treatments of water processing.
研究领域:
环境科学
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材料科学
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污水处理
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Zhiqiang Sun,Lei Zhao,Caihong Liu,Yufei Zhen,Jun Ma
In this study, a high capacity ( q m = 1351 mg g −1 ) with fast adsorption process (t < 5 min) towards bisphenol A (BPA) from water was achieved by an in-situ sp 2 C dominant N-doped carbon (polydopamine-carbon, PDA-C). The adsorption mechanism facilitating to the superior removal performance of PDA-C was systematically investigated by relationship study (adsorption capacity VS physiochemical property) and theoretical calculation. It could be concluded that the dominant sp 2 C ( I D /I G = 0.92–1.02) and N-heteroatom (2.26–5.09 at. %) in PDA-C contributed to enhancing the adsorptive interactions of π-π electron donor-acceptor and hydrophobic effect between the PDA-C and BPA, thus realized a ~1.8 times enhancement of q m in comparison with the conventional carbon (PRF-C). Calculated adsorption energy from the density functional theory (DFT) further demonstrated that the adsorption potential of N-doped carbon towards BPA increased linearly with increasing doping of N-heteroatom, especially for the pyridinic N which determined the hydrophobic effect of carbon. This finding firstly points out the dominant strengthening mechanism of N-heteroatom for carbonaceous adsorbent. The synthesized PDA-C showed a promising environmental application potential as revealed from the stable BPA adsorption efficiency in the interferences (H + /OH − , NaCl and HA), dynamic adsorption operation and multiple cycling test.
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
ENVIRONMENTAL RESEARCH
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2024
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IF 7.7
Yuqi Zhuang,Sinuo Li,Eldon R. Rene,Shuoyu Dong,Weifang Ma
Porous organic polymers (POPs) present superior adsorption performance to steroid endocrine disruptors . However, the effective recovery and high cost have been a big limitation for their large-scale applications. Herein, magnetic azo-linked porous polymers (Fe 3 O 4 @SiO 2 /ALP-p) were designed and prepared in a green synthesis approach using low-price materials from phloroglucinol and pararosaniline via a diazo-coupling reaction under standard temperature and pressure conditions, which embedded with Fe 3 O 4 @SiO 2 nanoparticles to form three-dimensional interlayer network structure with flexible-rigid interweaving. The saturated adsorption capacity to bisphenol-A (BPA) was 485.09 mg/g at 298 K, which increased by 1.4 times compared with ALP-p of relatively smaller mass density. This enhanced adsorption was ascribed to increment from surface adsorption and pore filling with 2.3 times of specific surface area and 2.6 times of pore volume, although the total organic functional groups decreased with Fe 3 O 4 @SiO 2 amendment. Also, the adsorption rate increased by about 1.1 and 1.5-fold due to enhancement in the initial stage of surface adsorption and subsequent stage pore diffusion, respectively. Moreover, this adsorbent could be used in broad pH (3.0–7.0) and salinity adaptability (<0.5 mol/L). The loss of adsorption capacity and magnetic recovery were lower than 1.1% and 0.8% in each operation cycle because of the flexible-rigid interweave . This excellent performance was contributed by synergistic effects from physisorption and chemisorption , such as pore filling, electrostatic attraction, π–π stacking, hydrogen bonding, and hydrophobic interaction. This study offered a cost-effective, high-performing, and ecologically friendly material along with a green preparation method.
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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水处理
✓ 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）