Polymers
·
2022
·Vol. 14
·期 4
·720
·
IF 4.967
Xiaoyan Zhu,Jiaqi Tong,Hangzhen Lan,Daodong Pan
Diclofenac sodium (DS), one of the most used non-steroidal anti-inflammatory drugs worldwide, is often detected in wastewater and natural water. This drug is ecotoxic, even at low concentrations. Therefore, it is essential to fabricate low-cost adsorbents that can easily and effectively remove DS from contaminated water bodies. In this study, a polyethyleneimine (PEI)-modified magnetic cellulose nanocrystal (MCNC) was prepared with a silane coupling agent as a bridge. TEM, FTIR, XRD, and VSM were used to demonstrate the successful preparation of MCNC-PEI. This composite adsorbent exhibited efficient DS removal. Furthermore, the adsorption performance of MCNC-PEI on DS was optimal under mildly acidic conditions (pH = 4.5). Adsorption kinetics showed that the adsorption process involves mainly electrostatic interactions. Moreover, the maximum adsorption capacity reached 299.93 mg/g at 25 °C, and the adsorption capacity only decreased by 9.9% after being reused five times. Considering its low cost, low toxicity, and high DS removal capacity, MCNC-PEI could be a promising adsorbent for treating DS-contaminated water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2017
·
IF 5.951
Nan Wang,Xiao-Kun Ouyang,Li-Ye Yang,Ahmed Mohamed Omer
A novel composite material (MCNC@Zn-BTC) is synthesized from magnetic cellulose nanocrystals (MCNC) and a metal–organic framework (MOF), based on Zn(II) and benzene-1,3,5-tricarboxylic acid (Zn-BTC), using a simple mechanical agitation method at room temperature. The developed MCNC@Zn-BTC was characterized by SEM, TEM, FTIR, XRD, XPS, and VSM instruments. The impact of MCNC@Zn-BTC dose, initial Pb(II) concentration, contact time, pH, and adsorption temperature have been explored. Results demonstrated that only 30 min was needed to achieve the adsorption equilibrium; the maximum adsorption capacity was 558.66 mg/g at 298.2 K. Besides, data obtained were fitted to a Langmuir isotherm model (R2 = 0.9890), and the adsorption kinetics followed a pseudo-second-order model. In addition, the removal (%) of Pb(II) remained greater than 80% after five recycled times. Therefore, the novel MCNC@Zn-BTC adsorbent displays great potential to improve the quality of environmental water contaminated with heavy metals.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2021
·Vol. 30
·期 4
·1344-1354
·
IF 3.667
Shen Jian,Jiang Fangyuan,Wang Nan,Ouyang Xiao–kun,Jin Mi-cong
Surface modification of cellulose nanocrystals (CNC) is essential for improving their reactivity and adsorption capacity. Oxidation, as a conventional modification method of CNC, has strong reaction conditions, which may partially destroy the structure of CNCs. Herein, we propose a mild cellulose modification method, in which diethylenetriaminepentaacetic acid (DPTA) was grafted onto CNC with an aminosilane coupling agent. To facilitate the enrichment and recovery of adsorbents, we prepared magnetic CNC before grafting DPTA, and finally obtained magnetic carboxylic functionalized CNC (MCNC-DPTA). The effects of the reaction parameters on the adsorption process were systematically studied by transmission electron microscopy, X-ray diffraction, Vibration sample magnetometry, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Additionally, the effects of the solution pH, the initial concentration of Pb, and the adsorption time on the adsorption properties of the materials were evaluated. Furthermore, the structure, morphology, and thermal properties of the solution were systematically studied. After 6 cycle tests, the adsorption amount of Pb(II) by MCNC-DPTA was only reduced by 7%. These results show that MCNC-DPTA is an environment-friendly adsorption material with an excellent Pb(II) removal effect.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2022
·
IF 2.042
Dongqing Zhao,Lijuan Zhang,Yao Lu,Haotian Li,Saiqi Wang,Haikuan Yuan,Xijian Liu,Chengyin Wang,Xueyan Zhu,Jie Lu
A tetraethylenepentamine modified magnetic cellulose nanocrystal composites (Fe3O4@CNC-TEPA) was prepared by the coprecipitation method and Schiff base reaction, which could adsorb Congo red (CR) efficiently. The morphology and structure of the nanoparticles were characterized by atomic force microscopy (AFM), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), vibrating sample magnetometer (VSM), zeta potential (ZETA), X-ray photoelectron spectroscopy (XPS) and Brunauer-Emmett-Teller (BET). Subsequently, the Fe3O4@CNC-TEPA adsorbed CR was investigated by comparative experiments, selective adsorption experiments, effect of pH, effect of adsorbent dosage, adsorption isotherms, thermodynamics parameters, adsorption kinetics, leaching experiments, desorption and reusability experiments. Results revealed the fact that the nanoparticles showed excellent adsorption capacity of CR (1049 mg g−1) due to the abundant hydroxyl and amino groups on the surface of the Fe3O4@CNC-TEPA. The adsorption process was best described by the the Langmuir equation and pseudo-second-order kinetic model. Moreover, the Fe3O4@CNC-TEPA loaded with CR can be recycled with NaOH solution easily, which can be used repeatedly for CR adsorption. After six cycles, the adsorption capacity was still about 81.5% of the original particles’. The environmentally friendly nanoparticles have great application prospects as adsorbents for removing CR.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 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）