ACS Omega
·
2020
·
IF 2.87
Jiamin Yu,Yan Kang,Wenjun Yin,Jinlin Fan,Zizhang Guo
Antibiotic pollution in water is an urgent environmental problem. A novel carbon adsorbent derived from powdery puffed waterfowl feather (PPWF)-doped Phragmites australis (PA) was proposed for enhancing the removal of antibiotics from water in this study. Amoxicillin (AMX) and cephalexin (CEX) were selected as typical antibiotics. PPWF-doped (FPAC) and -undoped (PAC) carbon adsorbents were developed to test the adsorption capacities and mechanisms of AMX and CEX. Characterization techniques such as N2 adsorption/desorption, Fourier transform infrared, X-ray diffraction, scanning electron microscopy, elemental analysis, and Boehm titration were used to determine the properties of adsorbents. Results showed that more microporous structure and surface functional groups are exhibited in FPAC compared to PAC. The nitrogen-containing functional groups were introduced in FPAC. Adsorption capacities at different contact times, pH, and initial concentration were investigated by batch experiments. The AMX and CEX maximum adsorption capacities of FPAC are 25.2 and 30.1% higher than those of PAC, respectively. The kinetic data were well represented by the pseudo-second-order model for AMX and CEX adsorption. The equilibrium data agreed well with the Langmuir model for AMX adsorption and the Freundlich model for CEX adsorption. The adsorption mechanism of AMX and CEX was chemisorption, such as electrostatic attraction and covalent bonding.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Shuqian Meng,Xiaoqian Ju,Jingwen Wang,Baolu Cui,Yuxi Liu,Haosheng Ma,Dechao Wang,Zhiyuan Yang
Carbon capture, utilization, and storage (CCUS) is a crucial technology for achieving carbon reduction targets. The key to CCUS technology lies in developing and designing efficient and low-cost CO 2 capture materials. Metal-organic frameworks (MOFs) have emerged as promising CO 2 adsorbents in the field of carbon capture. However, high agglomeration of nanoparticles and high cost have severely hindered the application of MOF-based solid adsorbents. This study employs an in-situ growth method to prepare a novel “corncob-shaped” PHNT@ZIF-8 composite material. During the reaction process, surface modification of halloysite nanotubes (HNT) enhances the interaction between HNT and ZIF-8. The resulting PHNT@ZIF-8 exhibits an enhanced CO 2 adsorption capacity of 1.48 mmol/g. Notably, the functionalized PHNT@ZIF-8 as CO 2 adsorbents demonstrated significant adsorption properties: a high specific surface area of 409.74 m 2 /g, good selectivity in simulated flue gas composition of 15%/85% (CO 2 /N 2 ) (39.1), excellent thermal stability, and superior regenerability. Moreover, PHNT@ZIF-8 adsorbs CO 2 primarily through van der Waals forces, which involve low energy and are easily reversible. After eight adsorption–desorption cycles, CO 2 capacity retention rate remains as high as 93% (1.37 mmol/g). This work enriches the repertoire of solid CO 2 composite adsorbents, providing a novel pathway for enhancing CO 2 adsorption performance.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Wei Wang,Shuangxi Zhou,Rui Li,Yongjun Peng,Chang Sun,Mohammadtaghi Vakili,Gang Yu,Shubo Deng
Trichloropropyl phosphate (TCPP) as a widely used typical chlorinated organophosphate flame retardant has received significant attention because of its widespread presence in water and negative effects on human health. In this study, a ball-milling method was used to prepare a magnetic powdered carbon adsorbent (PC/nano-Fe 3 O 4 composite) for TCPP removal via adsorption and catalytic degradation. The effect of Fe 3 O 4 content on TCPP adsorption and degradation performance by PC/nano-Fe 3 O 4 composite was investigated. The PC/nano-Fe 3 O 4 composite prepared by high Fe 3 O 4 content (25%) was not favorable for TCPP adsorption and degradation. However, the PC/Fe 3 O 4 containing low Fe 3 O 4 content (10%) had insufficient magnetic separation ability from water. The synthesized PC/nano-Fe 3 O 4 composite with a Fe 3 O 4 /PC mass ratio of 1/5 exhibited a maximum adsorption capacity of 2682.1 μg/g as well as a complete TCPP degradation within 3 h in a Fenton-like system. Moreover, the possible break sites of TCPP and its degradation pathway were proposed based on theoretical calculation and experimental analysis. Regeneration studies showed that PC/nano-Fe 3 O 4 composite had high reusability and adsorption capacity in six cycles, while its catalytic performance declined in the multiple reuse cycles. This strategy could be extended to prepare other magnetic powdered adsorbents for organic pollutant adsorption and degradation.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Hui Wang,Xinyi Long,Xuyi Yang,Qiyin Huang,Zewen Chen,Shengji Wu,Jie Zhou
Coal-fired mercury pollution poses an escalating threat to the ecosystem and human health. In this study, we designed and prepared transition metal oxides (MO x ) supported non-carbon-based adsorbents for Hg 0 removal using non-thermal plasma, based on the mechanism of Hg 0 removal. Specifically, MO x supported SiO 2 adsorbents were examined to explore the correlation between their redox ability and Hg 0 removal. The plasma treatment process could enhance the catalytic oxidation activity of the MO x (oxygen activation center) and effectively enhance Hg 0 removal efficiency. The Hg 0 removal efficiencies of Co 3 O 4 /SiO 2 -P and CrO x /SiO 2 -P prepared by plasma could maintain above 95.0 % and 85.0 % in the whole test, whereas the Co 3 O 4 /SiO 2 and CrO x /SiO 2 adsorbents prepared by traditional incipient wetness impregnation method exhibited lower Hg 0 removal efficiencies of nearly 20–30 %. Furthermore, with the addition of SO 2 , the Hg 0 removal performance of Co 3 O 4 /SiO 2 -P decreased significantly, while the performance of CrO x /SiO 2 -P remained relatively unchanged. Characterization results containing X-ray photoelectron spectroscopy (XPS) and in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) showed that the oxygen activation centers on CrO x /SiO 2 -P exhibited excellent resistance to SO 2 and were less susceptible to SO 2 occupation than those on Co 3 O 4 /SiO 2 -P. The plasma-prepared CrO x /SiO 2 -P adsorbents demonstrate promising potential for industrial applications in Hg 0 removal.
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
CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Chenyang Li,Haorui Zhang,Kai Shu,Tong Zheng
Microwave (MW) regeneration offers a promising alternative to energy-intensive, long-cycle thermal regeneration technologies due to its rapid molecular-level heating. However, the role of residual moisture in adsorbents is often neglected in MW regeneration efficiency. Since water is a polar dielectric material, it significantly affects the efficiency of adsorbent regeneration. While 2450 MHz MW frequency has been effective at the laboratory scale, the industrially prevalent 915 MHz frequency has received less attention. This study investigates moisture issues on carbon during MW regeneration through a comparative analysis of moisture removal using 2450 MHz, 915 MHz, and conventional heating (CH) methods. By integrating experimental and simulation approaches, the heat and mass transfer processes of gas, liquid, and solid phases under different heating methods were discussed. The impacts of heating methods and process parameters on drying rate were analyzed, using ketoprofen removal efficiency to evaluate the adsorption performance of the dried material. An economic cost analysis was conducted to inform a proposed strategy for moisture removal during MW regeneration. The results indicate that MW heating offers higher energy utilization than CH. Although 2450 MHz MW heating achieves the highest efficiency, it suffers from poor uniformity, leading to localized excessive temperatures and increased carbon loss. In contrast, MW at 915 MHz provides a more uniform temperature distribution and lower energy consumption. Enhancing vacuum degree improves the drying rate. Therefore, employing MW at 915 MHz under low vacuum conditions can reduce water removal costs in the MW regeneration. This study provides a theoretical foundation for the industrial application of MW regeneration.
研究领域:
环境科学
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化学工程
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DOI
高影响因子
MICROCHIMICA ACTA
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2020
·Vol. 187
·期 2
·1-8
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IF 6.232
Yuan Huamei,Ruan Guihua,Chen Zhengyi,Zhang Wenjuan,Jiang Xiangqiong,Du Fuyou
A porous carbon absorbent was obtained by using high internal phase emulsions (HIPEs) polymerization followed by high temperature carbonization under nitrogen protection. Graphene oxide (GO) and silica nanoparticles were doped into the HIPEs to enhance the adsorption ability and reusability. Fourier infrared spectroscopy, X-ray photoelectron spectroscopy and scanning electron microscopy were used for characterization and several parameters of separation and enrichment of trifluralin. The results showed that a hyper-crosslink framework material was obtained with abundant porous (pore size of about 30 μm) and a good adsorption and separation efficiency. The adsorption rate was up to 100% and trifluralin was completely eluted from the absorbent by 2.0 mL of an acetic acid-acetonitrile mixture.
Schematic representation of synthesis of porous carbon absorbent by GO and SiO 2 doped HIPEs. POLYHIPES-GO&SiO 2 : Polymerized High Internal Phase Emulsions doped with Silica and Graphene oxide.
研究领域:
环境科学
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材料科学
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高影响因子
ACS Applied Materials & Interfaces
·
2023
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IF 9.5
Bozhen Wu,Xuejiao Song,Dongchen Zheng,Qianyun Tan,Yong Yao,Fa-Qian Liu
Under favorable regeneration conditions (120 °C, 100% CO2), ultrafast adsorption kinetics and excellent long-term cycle stability are still the biggest obstacles for amine-based solid CO2 adsorbents. Inspired by natural wood, a biochar with a highly ordered pore structure and excellent thermal conductivity was prepared and used as a carrier of organic amines to prepare ideal CO2 adsorbents. The results showed that the prepared adsorbent has a very high adsorption working capacity (4.23 mmol CO2·g–1), and its performance remains stable even after 30 adsorption–desorption cycles in the harsh desorption environment (120 °C, 100% CO2). Due to the existence of the hierarchical structure, the adsorbent exhibited ultra-fast adsorption kinetics, and the reaction rate constant is 37 times higher than that of traditional silica. This adsorbent also showed a very low regeneration heat of 1.64 MJ·kg–1 (CO2), which is especially important for the practical application. Therefore, these biochar-based adsorbents derived from natural wood make the CO2 capture process promising.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2019
·
IF 3.683
Dongjin Wan,Lairong Wu,Yongde Liu,Jing Chen,Hailiang Zhao,Shuhu Xiao
In this study, spent bleaching earth (SBE) and pyrolyzed SBE (SBE@C) were tested for their capacity to remove tetracycline hydrochloride (TCH) from aqueous solution. The maximum adsorption capacity obtained by the Langmuir model is 0.114 mmol/g for SBE@C and 0.087 mmol/g for SBE. The deleterious effects of coexisting cations were ranked in a decline: Al3+ > Mg2+ > Na+. The results of various characterization methods show that the adsorption mechanisms mainly included π–π interactions, hydrogen bonding, electrostatic interactions, and changes in physical and chemical properties. After 3 repeated cycles of pyrolysis, the adsorption capacity of SBE@C remained at 85.4%, with SBE@C potentially recycled 21 times before complete loss of adsorption capacity. Furthermore, the problem of secondary pollution caused by SBE and residual oil is resolved by the use of SBE@C. All results indicate that SBE@C is a likely candidate for the treatment of TCH wastewater in the coming practical applications.
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
FUEL
·
2022
·
IF 8.035
Huangyu Yan,Guojie Zhang,Ying Wang,Jun Liu,Guoqiang Li,Yuqiong Zhao,Ying Xu,Yongkang Lv
The low-cost of CO 2 adsorbent is crucial for realistic CO 2 adsorption application. In this paper, a series of green CO 2 adsorbents were prepared using tetraethylenepentamine (TEPA) functionalized blast furnace slag (BFS) as raw materials, which not only implemented the recycling of blast furnace slag solid waste, but also realized the low cost of amine adsorbents. A series of characterization analyses were performed on the synthesized hydrotalcite-like and hydrated calcium silicate green support materials. The effects of structures, TEPA loadings and adsorption temperatures on the material properties were investigated. The result shows that BFS10.5-50TEPA with more pores is an ideal adsorbent, its optimum adsorption capacity for CO 2 is 5.64 mmol/g at 80 ℃, and the amine efficiency is as high as 38.42 %. According to CO 2 -TPD analysis, the dominant CO 2 adsorption mechanism of BFS10.5-50TEPA were physisorption and weak chemisorption. Moreover, the adsorption kinetics and regeneration performances also studied. The results indicate that pseudo-first-order model and pseudo-second-order model are both not accurately at predicting experimental results, while the Avrami model can accurately predict the adsorption kinetics of CO 2 at both low adsorption temperature and high adsorption temperature. After 10 adsorption-desorption recycles, the CO 2 adsorption capacity of BFS10.5-50TEPA still maintain 5.02 mmol/g. This study provides a novel method for the preparation of solid amine adsorbents with high adsorption performance from low-cost solid waste.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2017
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IF 2.659
Dezhi Chen,Caiqin Chen,Weisong Shen,Hongying Quan,Shasha Chen,Shasha Xie,Xubiao Luo,Lin Guo
Magnetic porous carbon-based sorbent (MPCS) with core-shell structure was prepared from the pyrolysis of Fe III -modified MOF-5. The component, structure and surface properties of the as-obtained sorbent were investigated by Raman spectroscopy, X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. Sorption behaviors of five organic micropollutants (OMPs), such as atrazine, carbamazepine, bisphenol A, norfloxacin and 4-nitrophenol, onto the magnetic porous MPCS were studied in a batch system. The adsorption capacities of the five OMPs onto MPCS followed the order of 4-nitrophenol > norfloxacin > bisphenol A > carbamazepine > atrazine. All isotherms were fitted well by the Dubinin-Ashtakhov (DA) model, and the approximate site energy distributions were acquired. The possible adsorption mechanisms of the five OMPs onto as-prepared MPCS were discussed in detail. This study will aid in further understanding of interactions between the OMPs and MOF-derived carbon-based materials.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 11
·1814
·
IF 5.719
Caizhen Liang,Qingshan Shi,Jin Feng,Junwei Yao,Hui Huang,Xiaobao Xie
In this work, an innovative nano-carbon material (N-CM) adsorbent was reported for exploring its adsorption behaviors toward cationic methylene blue (MB) and anionic reactive blue 19 (RB19) pollutants. The proposed N-CM was synthesized by a one-step solvothermal treatment of citric acid and zinc gluconate small precursors. N-CM consists of nanosheets that have an advantageous specific surface area, large sp2/sp3hybridized domains, and abundant nitrogen/oxygen-containing surface functional groups. The synergistic effects of these features are conducive to the MB and RB19 adsorption. Different from anionic RB19 adsorption (79.54 mg/g) by the cooperative π-π stacking and hydrogen bonding, cationic MB adsorbed onto N-CM mainly by the electrostatic attraction at the natural pH solution (> pHpzc), with an adsorption capacity up to 118.98 mg/g. Interestingly, both MB and RB19 adsorption conformed to the pseudo-second order kinetic (R2≥ 0.995) and Langmuir isothermal (R2≥ 0.990) models, accompanied by similar maximum monolayer adsorption capacities of 120.77 and 116.01 mg/g, respectively. Their adsorption processes exhibited spontaneously endothermic characteristics. Moreover, N-CM showed superior selective capability toward MB in different mixed dye systems, with high removal efficiencies of 73–89%. These results demonstrate that the high-performance carbon adsorbent prepared from small precursors via low-temperature carbonization shows great potentials in wastewater treatment.Keywords:nano-carbon adsorbent;small precursors;adsorption;methylene blue;reactive blue 19;selective capability
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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DOI
PubMed
高影响因子
ACS Omega
·
2019
·
IF 2.584
Wenting Si,Bin Yang,Qingni Yu,Lecheng Lei,Jingke Zhu
CO2 emission is generally regarded as the major contributor to global climate change, and polyethylenimine (PEI)-based CO2 adsorbents are promising materials for the capture of low concentration CO2. This paper deals with the deactivation kinetics of PEI-based CO2 adsorbents used for the capture of low concentration CO2. EA and TG analyses demonstrated that thermal degradation and O2-induced deactivation of the adsorbents occurred simultaneously under air exposure conditions. It was found by N2 exposure experiments at the temperature of 50–80 °C that the thermal degradation of PEI-based adsorbents followed a first-order reaction model with an activation energy of 80.98 kJ/mol and a pre-exponential factor of 6.055 × 108 (h–1). The parallel reaction model was employed to distinguish the O2-induced deactivation from the thermal degradation of the adsorbents through air exposure experiments within 50–80 °C. The O2-induced deactivation exhibited a second-order reaction with an activation energy of 74.47 kJ/mol and a pre-exponential factor of 6.321 × 106 (%–1·h–1). The results of simulating the overall deactivation of the adsorbents by the parallel reaction kinetic model were well consistent with those of the experiments, proving that the parallel reaction model was feasible for the description of the deactivation of PEI-based adsorbents.
研究领域:
环境科学
·
材料化学
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DOI
PubMed
高影响因子
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