ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Chenghan Ji,Hang Yu,Junhe Lu,Yi Ren,Lu Lv,Weiming Zhang
Adsorption as a desalination approach has the advantages of energy efficiency, low cost, and operational convenience, but its practical application is limited by low desalination capacity, consumption/disposal of strong acids/bases as regeneration reagents, and poor reusability. Herein, we synthesized a thermo-regenerable salt absorbent by grafting ethylenediaminetetraacetic acid (EDTA) onto a metal–organic framework (MOF), MOF-808-EDTA, which could rapidly adsorb NaCl within 30 min from saline water at 25 °C with a desalination capacity as high as 9.4 mmol/g. Moreover, the saturated adsorbent could be facilely regenerated in 80 °C water. Fourier transform infrared spectroscopy and derivative thermogravimetry revealed that temperature-regulated proton transfer between amino and carboxyl groups was the mechanism of thermo-regeneration. EDTA on MOF-808-EDTA appears in a zwitterionic state in water at room temperature, which allowed simultaneous adsorption of Na+ and Cl–. At elevated temperature, it returned to a nonionic state accompanied by the desorption of ions. A similar temperature-dependent adsorption–regeneration process was also observed for other salts, including LiCl, KCl, CaCl2, and MgCl2. Column experiments of brackish groundwater showed that 1 g of MOF-808-EDTA could produce ∼106 mL of fresh water (total dissolved solids < 600 mg/L) without significant capacity loss after 10 successive adsorption–regeneration cycles. This study is the first to propose an EDTA-based MOF for desalination and indicates the potential of MOF-808-EDTA as a green adsorbent for sustainable water desalination.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Wufeng Liu,Quanhua Xie,Tianlu Chen,Lu Ran,Zilin Nie,Yang Liu,Yuanyuan He,Haixing Chang,Najmeh Zare,Hassan Karimi-Maleh,Nianbing Zhong,Tejraj M. Aminabhavi
Photocatalytic optical hollow fibers (POHFs) coupled with spiral-shaped Cl − adsorption fibers are used to remove trichloroethylene (TCE) from wastewater. The POHFs are hollow quartz tubes coated with Ti 3 C 2 T x -doped oxygen vacancy (OV)-rich BiOBr (BiOBr-OV). The photocatalyst coating enhanced the excitation light intensity onto the photocatalytic fiber surface. The hetero-junction between Ti 3 C 2 T x and BiOBr-OV reduced the bandgap and broadened spectral absorption range of the composite photocatalyst. The material increased the production of reactive · O 2 - and •OH species, thereby improving the degradation of TCE. Spiral-shaped Cl − adsorption fibers comprised of polyethersulfone loaded with ethylenediaminetetraacetic acid-grafted metal–organic framework (MOF-808-EDTA). Tertiary amine groups (−R 3 N) of MOF-808-EDTA exhibited superior Cl − adsorption capabilities. As the Cl − ion indirectly quenches the free radicals, its removal reduced the inhibitory effect of the photocatalytic products, further enhancing the efficiency of TCE degradation and removing its degraded byproducts. TCE, chemical oxygen demand, and Cl − ion removal rates are 98.75, 69.15, and 99.22 %, respectively. Intimate coupling of photocatalysis and ion adsorption provided an effective solution for efficient removal of TCE, its degradation products, and Cl − ions from 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
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Bo Yue,Zhongwei Pang,Yang Yu,Jianfei Wu,Jiafu Qu,Jundie Hu,Dan Tian,Jianzhang Li,Yahui Cai
The environmental pollution caused by the discharge of oily wastewater and printing and dyeing wastewater is becoming more and more serious. Therefore, it is necessary to find an efficient method to separate oil/water emulsions and remove organic dyes from water simultaneously. However, the traditional separation membranes are usually very expensive and easy polluting the environment. Therefore, how to prepare high-efficiency separation membrane from low-cost, green renewable materials remains a huge challenge. In this study, ethylenediaminetetraacetic acid (EDTA) modified metal–organic framework (MOF-808) nanoparticles were introduced into the wood substrate to construct a 3D wood/MOF-808-EDTA membrane with efficient water purification performance (oil/water emulsion separation and organic dye removal). Due to the introduction of hydrophilic MOF-808-EDTA nanoparticles, this novel membrane can effectively separate stable oil-in-water emulsions and remove organic dyes from water. The prepared wood/MOF-808-EDTA membrane has a high separation efficiency (more than 99.9 %) and permeation flux (1698 ± 15.85 L·m −2 ·h −1 ). The removal efficiency of organic dyes is more than 94 % with the permeation flux 1360 ± 2.54 L·m −2 ·h −1 . More importantly, the separation efficiency (oil/water emulsion) remained above 99.9 % and the dye removal efficiency was still above 90 % after 10 cycles. Additionally, the wood/MOF-808-EDTA membrane also has good mechanical/chemical stability and anti-fouling properties. This work opens a new approach for the development of functional biomass material membranes for sewage purification.
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
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Lei Sun,Zeyun Yang,Limao Cairang
As a tripeptide molecule widely present in living organisms, glutathione (GSH) exhibits remarkable antioxidant and detoxification effects, and is involved in important physiological processes such as amino acid transport and cellular metabolism. Electrochemical detection can accurately and sensitively determine the GSH content in biological samples, which provides an important basis for early diagnosis, disease assessment and termination monitoring. In this study, ethylenediamine tetraacetic acid (EDTA) was grafted onto the framework of MOF-808 through the strategy of post-synthetic modification, which effectively increased the number of metal affinity active sites on the material. Furthermore, silver ions were abundantly and firmly chelated on MOF-808-EDTA through coordination, and an electrochemical sensing platform (MOF-808-EDTA-Ag/GCE) was successfully constructed for detecting GSH. Due to the solid-state signal amplification effect of AgCl, the current signal (I Ag ) can be significantly improved, while GSH preferred to competitive binding with Ag on the electrode surface, resulting in the extrusion effect caused by competitive coordination, thus the current signal decreased. The sensor realized the quantification of GSH through the decline level of current response, showing a satisfactory linear range (0.02 nM∼20 μM) and a low detection limit (0.013 nM). At the same time, the sensing platform has also been successfully used to measure the GSH content in human serum and urine, the recovery results (95.9 % ∼ 108.8 %) and relative standard deviation (RSD < 4.05 %) were all within the acceptable range, which exhibited an excellent practical application value.
研究领域:
分析化学
·
材料科学
·
电化学
·
生物分析
·
纳米技术
✓ 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）