INDUSTRIAL CROPS AND PRODUCTS
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2023
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IF 5.9
Aixia Chen,Ning Wang,Zheng Tian,Xiao Wei,Chanjuan Lei
To solve the problem of a large amount of poplar sawdust (Populus L.) in urgent need of disposal and widespread contamination by tetracycline (TC), a new and simple method of simultaneous activation, magnetization, and carbonization was used to prepare a magnetic porous carbon adsorbent (MPC). This agroforestry waste was successfully turned into a treasure. The magnetic properties make MPC easy to be separated from water. The activation of KHCO 3 and FeCl 3 ·6H 2 O and high-temperature carbonization significantly caused a significant increase in the pore volume of the MPC. The MPC has an ultra-high specific surface area (1002.48 m 2 g −1 ) and well-developed microporous/mesoporous structures. The adsorption process of the MPC on tetracycline was a chemisorption-based monolayer adsorption process with an adsorption capacity of 288.2 mg g −1 . π-π-EDA interactions and van der Waals forces were probably the most important driving forces for the adsorption of TC. The adsorption of TC by the MPC performed well at a wide range of pH and had significant resistance to interference. At the same time, the excellent adsorption effect was maintained after four cycles of experiments. The simple and unique preparation, magnetic properties, and excellent pore structures of the MPC make it a promising candidate for engineering 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
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2019
·Vol. 26
·期 14
·14382-14392
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IF 2.914
Yang Zhenyu,Xing Rong,Zhou Wenjun
Biochar are widely used as adsorbents/amendments for immobilizing pollutants in contaminated soils. In this study, the effects of dissolved organic matter derived from chicken manure (CMDOM) on the adsorption of ciprofloxacin (CIP) and Cu 2+ onto biochars were investigated. The FTIR spectra indicated that π-π donor-acceptor interactions between the hydroxyl groups on the biochar surface and the fluorine group connected to the benzene ring of CIP molecule was the main adsorption mechanism for CIP. CMDOM molecules interacted with the aromatic components in biochars and thus modified the surface chemical properties of biochar. The effect of CMDOM on the adsorption of CIP onto biochars showed great dependence on the distribution of solid adsorbed CMDOM and CMDOM in aqueous solutions. The solid adsorbed CMDOM facilitated CIP adsorption owing to increase the content of –OH on biochar surface, which could provide more π-electron donors and thus strengthened π-π EDA interactions between CIP and biochars. The EDS spectra showed that the ion exchange with K + was the main adsorption mechanism for Cu 2+ onto biochars, and the presence of CMDOM enhanced complexation of Cu 2+ with adsorbed CMDOM, thus increasing Cu 2+ adsorption onto biochars. These results are useful for the application of biochars to immobilize antibiotic and heavy metals in contaminated farmland soils when animal manure fertilizers is presented in soil environment.
研究领域:
环境科学
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土壤化学
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污染控制
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Tao Wang,Qing Zhang,Zhongjing Zhao,Lu Zhang,Baoshan Xing
Currently, identification and regulation of adsorption sites of carbon-based materials remain a major challenge. In this study, given the properties of the target contaminant, bisphenol A (BPA), we report a novel method for preparing ultra edge N-doped hierarchically porous carbon-based material with rich vacancy defects (HENDC) via a direct pyrolysis of simultaneous EDTA-4Na and g-C 3 N 4 . Interestingly, g-C 3 N 4 kills three birds with one stone, including pore-forming agent, nitrogen configuration regulator, and structural defect former. As such, compared with that of MNDC, which was direct pyrolysis of EDTA-4Na (462.5 mg g −1 for BPA and 551.2 mg g −1 for bisphenol S (BPS)), the adsorption capacity of HENDC for BPA was 870.1 mg g −1 , which exceeded that for BPS (793.3 mg g −1 ). Also, HENDC shortened the adsorption process to 10 min for BPA compared with MNDC (30 min) and displayed a promising environmental application potential. Based on experiments and theoretical calculations, the high adsorption performance of HENDC for BPA originated from edge nitrogen doping, defect inducing, and hierarchically porous structures. Specifically, Lewis acid-base interactions of varying strength occurred between both pyridinic-N (stronger) and pyrrolic-N (weaker) with BPA. A strong π-π EDA interaction between pyridinic-N and BPA, which was further facilitated by vacancy defects in adjacent edge nitrogen. The hydrophobic effect promoted the interaction between pyrrolic-N and BPA. This work offers deep insights into effective and selective removal of BPA, suggesting new strategies for exploring cost-effective carbon-based adsorbents.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL POLLUTION
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2023
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IF 8.9
Ruotong Jin,Cailian Zhao,Yanxing Song,Xiaojie Qiu,Chenxi Li,Yingxin Zhao
Competitive adsorption and complementary adsorption between emerging pollutants has been observed in multiple studies. Investigation of the preference of pollutants for different types of adsorption sites can provide a supplementary perspective for understanding complementary adsorption. In this study, the simultaneous adsorption of two typical emerging pollutants, sulfamethoxazole (SMX) and bisphenol A (BPA), on magnetic biochar (MBC-1) was investigated. The results showed that the modification with ferric chloride optimized the surface properties of biochar (aromaticity, hydrophobicity , and oxygen-containing functional groups, etc.), and helped to remove SMX and BPA through various interactions. The equilibrium adsorption capacity of the two adsorbents was inhibited by competitive adsorption in the mixed solute systems, which was due to the same adsorption mechanism. When pH = 7, the SMX and BPA adsorption mainly involved pore filling, hydrophobic effect, π-π EDA, and hydrogen bonding. In addition, electrostatic force, surface coordination, and ion exchange have also been proven to be related to the adsorption of SMX and BPA. In the co-adsorption system, BPA's competitive advantage might be due to its superior hydrophobicity, charge property, and molecular diameter. In the competitive adsorption experiment, the total adsorption capacity (Q i ) of the competitive solute exceeded the adsorption inhibition (△Q i ) of the main solute, indicating that the two solutes occupied their preferred adsorption sites, which confirmed the complementary adsorption phenomenon. Complementary adsorption can be explained by the preference of SMX and BPA for different types of adsorption sites. BPA preferentially occupied high-energy sites in the co-adsorption system, such as π-π EDA interaction, ion exchange, and surface coordination. At the same time, SMX tended to be removed by hydrophobic interaction and hydrogen bonding.
研究领域:
环境科学
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
·
IF 7.312
Xian Hu,Yangjun Xie,Rongnan He,Lixian Yao,Shasha Ma,Cuihua Bai
The stability, versatility, and reusability of an adsorbent are of great significance to its practicability to remove antibiotics from water due to their universal residual. Herein, a magnetic composite of nano-iron wrapped by graphitic carbon in the carbonaceous matrix with hierarchical pores (Fe in /C-700) was constructed by one-step pyrolysis using Fe in /Zn-MOF as a precursor. Fe in /C-700 exhibited a core–shell structure and superparamagnetism behavior, which showed excellent chlortetracycline (CTC) adsorption with the maximum adsorption capacity of 546.5 mg/g. The adsorption process matched well with the pseudo-second-order kinetics model and Langmuir model, indicating chemisorption was likely contributed to the CTC adsorption. Electrostatic interaction, surface complexation, hydrogen bond, and π-π EDA interaction were the dominant driving forces. Cl - and SO 4 2- significantly enhanced the CTC adsorption due to the electrostatic attraction or hydrogen bond formed among Fe in /C-700, anions, and CTC. Fe in /C-700 maintained high adsorption capacities in the mixed antibiotic system (255.1, 143.3, and 169.6 mg/g for CTC, ciprofloxacin, and sulfamethoxazole), in actual water (372.9, 383.3, 390.6, and 366.7 mg/g for CTC in Pearl River water, lake water, tap water, and ultrapure water), and regeneration (366.7, 354.2, 360.4, 314.6, and 301.0 mg/g for CTC in five runs), indicating a promising reusable adsorbent for the remediation of antibiotics in water. These findings provide a feasible and straightforward strategy to synthesize high stable magnetic nanoparticles derived from MOFs.
研究领域:
环境科学
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材料科学
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水处理
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产品关联
DOI
高影响因子
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