查找使用阿拉丁产品的科研文献

NH2-MIL-100(Fe) Impregnated Amine-Functionalized Magnetic Hydrochar: Synergistic Adsorption Mechanisms for Multiple Heavy Metals and Life Cycle Assessment

Yin Shiyu,Du Haiying,Yang Hong,Lai Chunrong

The treatment of industrial wastewater containing multiple heavy metals (MHMs) remains challenging, primarily because conventional adsorbents suffer from poor stability, limited adsorption capacity in mixed-metal systems, or high energy consumption during synthesis. To address these issues, this study employed a room-temperature in-situ impregnation method to load NH 2 -MIL-100(Fe) onto amine-functionalized magnetic hydrochar (HBAP). Three highly dispersible magnetic composites, designated as NM-100-HBAP-X (X = 0.75, 1, 1.25), were synthesized by adjusting the mass ratio of NH 2 -MIL-100(Fe) to HBAP. Experimental results demonstrated that the optimal material (NM-100-HBAP-1) exhibited high adsorption capacities for Pb(II), Cd(II), and Cr(VI) in a mixed-metal system. The maximum adsorption capacities determined by the Langmuir model were 181.13, 175.02, and 158.69 mg/g for Pb(II), Cd(II), and Cr(VI), respectively, which are comparable to previously reported values for hydrochars or MOF-based materials. Mechanistic analysis revealed that amino groups facilitate a synergistic process by reducing Cr(VI) to Cr(III), which is then immobilized via complexation and co-precipitation, thereby further enhancing Cd(II) removal. The material also demonstrated good cycling stability, retaining over 50% of its initial adsorption capacity after five regeneration cycles, and maintained effective performance in various real water samples. Furthermore, toxicity tests confirmed its environmental safety, and life cycle assessment quantified the GWP of producing 1 kg of NM-100-HBAP-1 as 41.224 kg CO 2 eq, with electricity and NH 2 -H 2 BDC synthesis as the dominant contributors. This study not only provides an efficient adsorbent for heavy metal removal but also offers a systematic research framework integrating material design, mechanistic investigation, and environmental assessment for pollution remediation.

MXene/NH2-MIL-125 composite membrane for efficient oil/water separation, noble metal recovery, and photocatalytic purification of complex wastewater

Xiaohan Niu,Cong Wen,Chunjia Luo,Jincui Gu,Yixuan Ma,Luke Yan

A “separation-recovery-purification” strategy inspired by glass sponges is proposed. • The composite membrane achieves an oil/water separation efficiency of over 97.7%. • The composite membrane attains over 97% recovery efficiency for noble metal ions. • Recycled membranes gain over 97% degradation efficiency for dyes and antibiotics. • The recycled membranes display excellent antibacterial capacity. Existing MXene-based composite materials face significant challenges in combining water purification with precious metal recovery. For complex wastewater systems containing oil–water emulsions, precious metal ions, and organic dyes, there is an urgent need to develop efficient and multifunctional MXene-based composite membranes to enhance their applicability in complex aquatic environments. In this study, MXene nanosheets and NH 2 -MIL-125 were assembled into MXene/NH 2 -MIL-125 composite membranes via vacuum-assisted filtration. The optimized composite membranes exhibited excellent hydrophilicity and underwater superoleophobicity, achieving oil–water separation efficiencies exceeding 97.7% in various emulsion systems. In addition, the membranes enabled the selective recovery of Ag + , Pd 2+ , and Au 3+ ions, with recovery efficiencies above 97% for all three ions and maximum adsorption capacities of 887.86, 845.46, and 806.57 mg·g −1 , respectively. After metal recovery, the resulting M-3@Ag membrane exhibited markedly enhanced photocatalytic performance and excellent antibacterial activity. During cyclic purification tests, the composite membrane successfully implemented an integrated “separation–recovery–purification” strategy. Overall, this work provides a green and efficient approach for the treatment of complex wastewater and the sustainable recovery of precious metal resources, showing great potential for practical applications.

Magnetic nitrogen-doped porous carbon sorbents derived from NH2-MIL-88(Fe) for efficient extraction of chloramphenicol in honey samples

Aihong Tang,Yujuan Cao,Manli Guo,Bixia Lin

One-step synthesis of magnetic nitrogen-doped porous carbon (MNPC). • The addition of urea promotes the graphitization degree of MNPC. • MNPC serves as an MSPE adsorbent with excellent reusability. • Good analytical performance for chloramphenicol in honey is obtained. Magnetic porous carbon (MPC) materials derived from metal-organic frameworks (MOFs) inherit the high porosity and tunable pore structure of MOFs and also endow the materials with magnetic response, demonstrating great potential for magnetic solid-phase extraction (MSPE). However, MPCs obtained directly by carbonizing MOFs suffer from issues such as easy pore collapse and a single surface chemical functionality, which necessitate modification methods to improve their performance. The nitrogen-doping strategy offers unique advantages in charge distribution, the creation of active sites, alterations in surface chemical properties, and enhanced structural stability. Therefore, a magnetic nitrogen-doped porous carbon (MNPC) derived from NH 2 -MIL-88(Fe) was developed as an MSPE adsorbent, combined with liquid chromatography, for sensitive determination of trace amounts of chloramphenicol in honey samples. The developed method exhibits a good linear relationship in the range of 0.05-50 μg·L -1 , with R 2 of 0.9999, LOD (S/N=3) of 0.005 μg·L -1 , and LOQ (S/N=10) of 0.02μg·L -1 . The spiked recovery rate ranged from 93.5% to 99.2%, and the RSD ranged from 1.3% to 10.7%. Therefore, this method has significant potential for routine monitoring of chloramphenicol residues in food safety supervision.

High-Efficiency Recovery of Au (III) From Acidic Metallurgical Wastewater Using Sulfonic Acid-Functionalized UIO-67-NH2 Metal–Organic Frameworks

Changqing Xia,Zhengshen Bao,Dehong Xu,Shixing Wang,Weili Li

A robust metal–organic framework (MOF) material, UIO67-PS, was synthesized by grafting sulfonic acid groups onto the UIO67-NH 2 framework. This modification significantly enhances the electronegativity and coordination-site density on the MOF surface, enabling threefold higher Au (III) adsorption capacity (536.4 mg/g at pH 2.0 temperature 25°C and agitation speed 120 rpm) compared to pristine UIO67-NH 2 (168.4 mg/g). The material exhibits exceptional acid resistance and recyclability (91% capacity retention after three cycles). Density functional theory (DFT) calculations and X-ray photoelectron spectroscopy (XPS) analyses reveal that the adsorption mechanism is governed by synergistic electrostatic interactions and chelation, wherein electron-rich oxygen/nitrogen-containing functional groups on the adsorbent surface coordinate with metal ions via covalent bonds to form stable five-membered ring complexes. Kinetic studies confirm rapid adsorption equilibrium (< 240 min), while thermodynamic analysis indicates an endothermic, entropy-driven process. Notably, UIO67-PS demonstrates superior selectivity for Au (III) over competing ions (e.g., Zn 2+ and Cu 2+ ) in simulated e-waste leachates. Achieving removal rates as high as 80% in real metallurgical wastewater highlights its potential for practical application. This work reveals key coordination interactions, including complexation and electrostatic attraction, within a simulated e-waste leachate system containing competing ions such as copper and nickel. These insights advance the design strategies of MOFs for sustainable Au (III) recovery and provide a scalable platform for industrial wastewater treatment, contributing to environmental protection and the sustainable utilization of critical material resources.

Synergistic charge redistribution at SrTiO3@NH2-MIL-125 S-scheme heterostructure: steering photogenerated reactive species for efficient NO-to-nitrate conversion

Wenrui Dai,Chenxiang Wang,Jiajia Gao,Haotong Ma,Yingchun Miao,Shuo Wang,Zhanshuo Tao,Shuning Xiao

Salicylic acid-modified defective NH2-MIL-125/sodium alginate composite aerogel beads for enhanced Pb(II) and Cd(II) removal

Bihe Chen,Ruoshan Yang,Mengyang Li,Yajing Niu,Jinyao Hu,Yingying Wang,Wenzhi Tang,Jingbo Zhou,Zhonghong Li

The threat of Pb(II) and Cd(II) in water demands advanced adsorbents. While metal-organic frameworks (MOFs) have demonstrated great potential for heavy metal ions adsorption, their microporous nature and powdery form limit practicality. Thus, we engineered a sodium alginate composite aerogel bead loaded with salicylic acid-modified defective NH 2 -MIL-125, for the efficient removal of Pb(II) and Cd(II) from aqueous solutions. By adjusting the solvent volume ratio to regulate the crystal morphology and introducing salicylic acid as a fragmented ligand to compete with NH 2 -BDC to coordinate with Ti-oxo clusters, a defective Ti-MOFs with mesoporous structure (pore size increased from 2.30 to 8.93 nm) and abundant active sites was successfully developed. Further integration with sodium alginate formed millimeter-scale aerogel beads, improving the reusability and enhancing adsorption performance: the maximum adsorption capacities of 428.01 mg g −1 for Pb(II) and 179.67 mg g −1 for Cd(II), respectively. The adsorption process, described by the pseudo-second-order kinetic and Sips isotherm models, is driven by multilayer chemical adsorption via electrostatic attraction, ion exchange and coordination reactions with −COOH, −NH 2 and −OH groups. The beads also exhibit excellent selectivity and reusability, maintaining high efficiency of ∼97 % for Pb(II) over 5 cycles. This work provides a promising strategy for designing high-performance and recyclable adsorbents for adsorbing heavy metal ions from water.

Promoting tetracycline degradation via synergistic effects of BiOBr/TiO2/NH2-UiO-66 ternary Z-scheme heterojunctions under visible light irradiation

Dong Mingming,Yang Shuyong,Wang Anshun,Zhou Peng,Huang Zewen,Tu Shenghui

A ternary Z-scheme heterojunction photocatalyst, BiOBr/TiO 2 /NH 2 -UiO-66(Zr), was constructed to enhance the visible-light-driven degradation of tetracycline (TC). This composite material was synthesized via hydrothermal and in situ growth methods, and its microstructure and properties were analyzed through a series of systematic characterizations. The introduction of NH 2 -UiO-66 significantly increased the specific surface area and visible light absorption while promoting the separation and transport of photogenerated charge carriers. Under visible light irradiation, the optimal composite (BTU-2) achieved a TC degradation rate of 96.3% within 80 min, with a reaction rate constant 9.41, 12.03, and 8.58 times higher than those of pure BiOBr, TiO 2 nanowires (NWs), and NH 2 -UiO-66, respectively. Trapping experiments and electron paramagnetic resonance (EPR) analysis confirmed that h + and ‧O 2 − were the dominant active species. Liquid chromatography–mass spectrometry (LC–MS) further elucidated the possible TC degradation pathways. This work provides a feasible strategy for designing efficient visible-light-responsive photocatalysts for antibiotic wastewater treatment. Graphical abstract

Cd[C(NH2)2O]2Cl2: A Urea-Based Open-Framework Crystal with Concurrent Short UV Cutoff Edge and Large Birefringence

Chen-Yuan Ma,Xin-Mei Zeng,Jia-Tong Li,Xing-Yu Bi,Zhi Fang,Mei-Hong Duan

High-performance birefringent crystals are crucial for advancing modern optics. Regrettably, conventional birefringent crystals are usually limited by narrow transmission windows or insufficient birefringence. Recognizing that birefringence originates from structural anisotropy, we herein assembled anisotropic π-conjugated urea ligands through a cadmium-based open framework. By leveraging the distorted Cd-based octahedra and urea-derived hydrogen-bonding network, a novel birefringent crystal, Cd[C(NH2)2O]2Cl2, was successfully obtained. Cd[C(NH2)2O]2Cl2 was characterized by a characteristic 4 × 4 × 6 open-framework skeleton, wherein the repeating building unit {Cd[C(NH2)2O]2Cl4} is constructed by the oxygen sharing between distorted CdCl4O2 octahedra and planar [C(NH2)2O] groups. Notably, Cd[C(NH2)2O]2Cl2 achieved an excellent balance between wide bandgap and substantial optical anisotropy by exhibiting a short UV cutoff edge of 201 nm and a birefringence of 0.117@546 nm, which should benefit practical applications.

Interfacial covalent assembly of CdTe QDs on Eu3+-modified NH2-UiO-66 for Ratiometric fluorescence detection and adsorption of glyphosate

Jun Chen,Kai Jiang,Tianxiang Hang,Ciyang Zhang,Ruijie Che,Mingzhu Xia,Wu Lei

A covalently coupled CdTe/NH₂-UiO-66(Eu) ratiometric probe was developed. • Adsorption experiments and IGM analysis indicated rapid glyphosate uptake mediated by multiple interfacial interactions. • Glyphosate enhanced blue emission and weakened green emission for ratiometric readout. • Lifetime, XPS, and TD-DFT analyses provided mechanistic insights into the fluorescence response. Rapid detection and effective adsorptive capture of glyphosate from water are important for aquatic environmental monitoring and agricultural product safety. To address the susceptibility of single-emission fluorescence signals to external fluctuations and the limited glyphosate-capture capability of conventional fluorescent probes, a dual-emission platform integrating glyphosate adsorption with ratiometric fluorescence detection was constructed through the covalent interfacial assembly of Eu 3+ -modified NH 2 -UiO-66 and mercaptopropionic acid-modified CdTe QDs. Adsorption experiments and independent gradient model (IGM) analysis indicated that the composite exhibited rapid glyphosate uptake mediated by multiple interfacial interactions. In the presence of glyphosate, CdTe/NH 2 -UiO-66(Eu) exhibits enhanced blue emission at 434 nm and weakened green emission at 524 nm, producing a pronounced I 434 /I 524 ratiometric response. The fluorescence intensity ratio shows a linear dependence on glyphosate concentration over the range of 0.5–80 μM, with a limit of detection of 0.217 μM. Based on fluorescence lifetime results and XPS analysis, the ratiometric fluorescence response mechanism of the probe was elucidated. TD-DFT calculations further suggested that glyphosate modifies the excited-state charge distribution and charge-transfer characteristics associated with the MOF component. This work provides an interfacial assembly strategy for constructing MOF-based platforms that combine adsorptive glyphosate capture with ratiometric fluorescence sensing. Download: Download high-res image (182KB) Download: Download full-size image

Adsorption of 2,4-dichlorophenoxyacetic acid and glyphosate from water by Fe3O4-UiO-66-NH2 obtained in a simple green way

Zhang Xiaoting,Liu Yang,Qu Lingbo,Han Runping

In this study, a green adsorbent (Fe 3 O 4 -UiO-66-NH 2 ) with the ability of addressing the issues of separation and recovery of UiO-66-NH 2 is obtained using a simple co-precipitation method under environmentally benign conditions. Various characterization techniques are utilized for evaluating the properties of the developed adsorbent. The capability of Fe 3 O 4 -UiO-66-NH 2 towards 2,4-dichlorophenoxyacetic acid (2,4-D) and glyphosate (GP) from solution is explored. The results revealed that the magnetization process did not destroy the crystal structure of UiO-66-NH 2 , which ensured that Fe 3 O 4 -UiO-66-NH 2 had good adsorption performance for 2,4-D and GP. The adsorption processes showed a wide pH application range, high salt tolerance, and regeneration performance as well as an excellent adsorption rate. Results from thermodynamic study showed that both processes were spontaneous and endothermic. The unit uptake ability of Fe 3 O 4 -UiO-66-NH 2 for 2,4-D and GP reached up to 249 mg·g −1 and 183 mg·g −1 from Langmuir model at 303 K, respectively. When solid–liquid ratio was 2 g·L −1 , Fe 3 O 4 -UiO-66-NH 2 can reduce the content of 2,4-D or GP with the initial density of 100 mg·L −1 below the drinking water requirement limit. In addition, the reusability efficiency of Fe 3 O 4 -UiO-66-NH 2 towards 2,4-D and GP was found to be 86% and 80% using 5 mmol·L −1 NaOH as eluent. Analysis of simulated water samples indicated that Fe 3 O 4 -UiO-66-NH 2 could achieve the single or simultaneous removal of 2,4-D and GP from wastewater. Summarily, Fe 3 O 4 -UiO-66-NH 2 as a green adsorbent can serve as an alternative for removing 2,4-D and GP from water body.

An adsorptive photo-Fenton-like removal of 1,2-benzisothiazolin-3-one by NH2-MIL-53(Fe) under simulated solar light

Peifu Sun,Xiao Zhang,Zhiren Guo,Xinyue Liu,Yuanming Lan,Dongxiang Zhang,Hansheng Li,Jinying Li,Helei Liu,Xiyan Xu

The excessive discharge of isothiazolinone bacteriostatic agent-containing wastewater has posed serious threats to human health and environmental safety. As 1,2-benzisothiazolin-3-one (BIT) is one of the most commonly used isothiazolinones, its effective degradation is necessary and urgent. In the current study, a NH2-MIL-53(Fe)-based adsorptive photo-Fenton-like system was constructed for efficiently adsorbing and photodegrading BIT under solar light. The equilibrium BIT adsorption capacity Qe of NH2-MIL-53(Fe) reached 1140.89 mg g−1. The adsorptive photo-Fenton-like system has achieved more than 90% removal of BIT using NH2-MIL-53(Fe) in the presence of H2O2 under solar light irradiation, and the band gap of NH2-MIL-53(Fe) was calculated by UV-Vis analysis to be 2.10 eV. The influences of pH, dosage of photocatalysts and H2O2 were also assessed. It was found that H2O2 reduced the recombination of electron–hole pairs, and the radical quenching experiments and EPR testing result confirmed that h+, ˙OH and O2˙− played a crucial role in the photocatalytic process. This study supports the application of Fe-based MOF materials for simultaneous adsorption and the solar light photocatalytic degradation of BIT.

Grafting a Porous Metal–Organic Framework [NH2-MIL-101(Fe)] with AgCl Nanoparticles for the Efficient Removal of Congo Red

Qiyue Zhang,Aori Qileng,Jiale Li,Yiran Cao,Weipeng Liu,Yingju Liu

Organic dyes can produce harmful effects on the water environment, such as affecting the growth of aquatic organisms, reducing the transparency of water bodies, and causing eutrophication of water bodies, so it is necessary to mitigate the hazards of organic dyes. In this study, a metal–organic framework [NH2-MIL-101(Fe)] was synthesized by the solvothermal method as a carrier for the in situ uniform deposition of AgCl nanoparticles on its surface, which was successfully used for both adsorption and degradation of Congo red. Adsorption results showed that the adsorption kinetics conformed to the proposed secondary adsorption kinetics equation with a maximum adsorption capacity of 248.4 mg·g–1. Furthermore, the degradation results indicated that with the aid of sodium borohydride as a reducing agent, the degradation of Congo red followed pseudo-first-order kinetics with a degradation rate of 0.077 min–1, and the complete degradation of Congo red was finished within 18 min. Therefore, AgCl/NH2-MIL-101(Fe) may find a potential application in the removal of dyes from wastewater.