Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Jingjing Fang,Junjie Qian,Wen Shi,Huaqian Mou,Xiujuan Chen,Gaoxiang Zhang,Zanfang Jin,Feili Li
The bioaccumulation of heavy metals (HMs) at the water-algal interface determines their threat degree to aquatic ecosystem . Amino acids (AAs), as predominant components of dissolved organic matter (DOM), play pivotal roles in shaping the speciation of HMs in water and their subsequent accumulation by algae. However, the diverse nature of amino acid poses a challenge in generalizing the underlying mechanisms. This study explores four amino acids (asparagine, aspartic acid , glycine, lysine), each possessing distinct amino and carboxyl groups , and investigates their impact on zinc (Zn) bioaccumulation through batch experiments. Upon the introduction of AAs, the adsorption process obeyed the pseudo-second-order kinetic adsorption model demonstrating chemisorption (R 2 >0.99), and it affected Zn externalization (up to 3.994 mmol g - 1 ). This phenomenon followed a two-step model, indicating multilayer adsorption. The study proposed that the protonated amino group of AA could serve as a link between Zn-AA complex and microalgae. Amino acids adsorbed onto the surface of microalgae via protonated amino groups did not occupy the Zn-binding sites, instead, they furnished additional functional groups. This differs from the previous results of organic acids containing only carboxyl functional groups as DOM. Multiple linear regression equations and correlation analyses were used to explain the effects of amino and carboxyl morphology on microalgae accumulation of Zn. The equation showed that the leading model terms explain 75.8% of the accumulation amount variance. This study enhances our understanding of the effects of functional group-different DOM on the accumulation of heavy metals in microalgae, offering insights for future research and prediction.
研究领域:
环境科学
·
水生生态学
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 11
·10808-10819
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IF 2.8
Peng Zhongya,Zhao Hang,Lyu Honghong,Wang Lan,Huang Hua,Nan Qiong,Tang Jingchun
This study was conducted to understand the effects of ultraviolet (UV) irradiation on the physicochemical properties and the hexavalent chromium (Cr(VI)) removal ability of biochar. Structural and morphological analysis showed that UV irradiation increased the specific surface area of biochar and added a large amount of oxygen-containing functional groups (e.g., carboxyl, lactonic, and hydroxyl) to biochar’s surface. Batch sorption experimental results showed that UV-modified biochar (UVBC) produced at the pyrolysis temperature of 300 °C, the irradiated time of 24 h, and the irradiation distance of 40 mm exhibited excellent Cr(VI) removal ability (from 1.11 mg/g for BC to 20.04 mg/g for UVBC, a 18.1-fold increase). The adsorption kinetics and adsorption isotherm data agreed well with the pseudo-second-order model and Freundlich model, respectively. Experimental and modeling results suggest that the oxygen-containing functional groups and specific surface areas of biochars were notably increased by UV irradiation, which enhanced Cr(VI) adsorption by surface complexation. X-ray photoelectron spectroscopy (XPS) analysis of UVBC before and after reaction with Cr(VI) showed that reduction occurred during Cr(VI) adsorption. The energy consumption of UV modification is 2.7 MJ per gram of UVBC produced, which is comparable to that in activated carbon. The results showed that the method of UV modification of biochar is a very novel and effective method for the adsorption of Cr(VI) in solution.
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
Environmental Technology & Innovation
·
2019
·
IF 2.8
Ali Aghababai Beni,Akbar Esmaeili
Common methods for removing heavy metals have numerous drawbacks, including low efficiency and high costs. In the biosorption of heavy metals, ions biosorbed on surfaces and active sites of biosorbents. In this paper, the relationship between the factors (pH, temperature, biosorbent dosage, retention time and Functional groups) and removal efficiency has been investigated. The purpose of this work is to introduce optimal conditions for biosorption reaction. Also, by introducing various types of biosorbents, expressed the advantages and method of preparation for each one. In various papers, not all biosorption isotherm models have been mentioned, there are described various types of biosorption isotherm, kinetics and thermodynamics models and important process data is set up for quick access to the tables.
研究领域:
环境科学
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生物学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Yongsheng Jia,Donghang Chen,Yan Li,Enze Li,Long Zhao,Limin Guo
In this study, CO 2 was converted to activated carbon by the molten salt CO 2 capture and electrochemical conversion (MSCC-EC) method, and the surface oxygen content of the activated carbon was further modified for the adsorption of polar molecules (chlorobenzene) and nonpolar molecules (toluene), the role of the pore structure and surface O-containing functional groups of the adsorbents in contributing to the adsorption process was systematically investigated. The results showed that MS-AC 500-10 , MS-AC 500-15 , and MS-AC 550-15 have rich pore structures with specific surface areas of 811.56 m 2 /g, 835.35 m 2 /g, 1249.104 m 2 /g, and surface oxygen contents of about 10 %, 15 %, 15 %, respectively. The toluene adsorption capacity of MS-AC 500-10 , MS-AC 500-15 , and MS-AC 550-15 was 203.82 mg/g, 229.72 mg/g, and 358.97 mg/g, respectively, and was dominated by pore adsorption, which was positively proportional to the specific surface areas and pore volumes, the adsorption process belonged to the pseudo-first-order kinetic model. The adsorption amounts of chlorobenzene by MS-AC 500-10 , MS-AC 500-15 , and MS-AC 550-15 were 287.98 mg/g, 363.11 mg/g, and 495.41 mg/g, respectively. In addition to the pore adsorption, the oxygen content on the surface of the adsorbents had a non-negligible promotion effect on the adsorption of chlorobenzene, mainly because chlorobenzene is a polar molecule, and the asymmetric electrons on its surface have strong interactions with the O-containing functional groups on the surface of the adsorbents. Moreover, the prepared adsorbents were thermally stable, and the decay rate of adsorption performance was less than 5 % after five adsorption–desorption cycles.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2023
·Vol. 10
·期 28
·2302882
·
IF 15.1
Yanan Huang,Jibing Shen,Shuai Lin,Wenhai Song,Xuebin Zhu,Yuping Sun
High-quality few-layer M 4 C 3 T x (M = V, Nb, Ta) MXenes are very important for applications and are necessary for clarifying their physicochemical properties. However, the difficulty in etching for themselves and the existence of MC/MC 1−δ and M-Al alloy impurities in their M 4 AlC 3 precursors seriously hinder the achievement of defect-free few-layer M 4 C 3 T x (M = V, Nb, Ta) MXenes nanosheets. Herein, three different defect-free few-layer M 4 C 3 T x (M = V, Nb, Ta) nanosheets are obtained by using a universal synthesis strategy of calcination, selective etching, intercalation, and exfoliation. Comprehensive characterizations confirm their defect-free few-layer structure feature, large interlayer spacing (1.702–1.955 nm), types of functional groups (–OH, –F, –O), and abundant valance states (M 5+ , M 4+ , M 3+ , M 2+ , M 0 ). M 4 C 3 T x (M = V, Nb, Ta) free-standing films obtained by vacuum filtration of few-layer M 4 C 3 T x inks show good hydrophilia, high thermostability, and conductivity. A roadmap on synthesis of defect-free few-layer M 4 C 3 T x (M = V, Nb, Ta) nanosheets are proposed and three key points are summarized. This work provides detailed guidelines for the synthesis of other defect-free few-layer MXenes nanosheets, but also will stimulate extensive functional explorations for M 4 C 3 T x (M = V, Nb, Ta) MXenes nanosheets in the future.
研究领域:
材料科学
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化学
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DOI
高影响因子
INORGANICA CHIMICA ACTA
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2024
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IF 2.7
Guang-Li Zhou,Bo-Wen Liu,Guang-Yu Cui,Wei Zhang,Ji-Min Yang
Radioactive iodine waste from the nuclear industry poses a critical threat to human health, and its effective capture has become an important research topic. In this study, modified UiO-66-X adsorbents (where X is ATA, BTA, or STA) were used to investigate the effects of the free functional groups in the UiO-66 skeleton on iodine capture in the vapor and solution states. The adsorption behavior revealed that the capture efficiency of UiO-66-ATA was substantially higher than that of UiO-66-BTA and UiO-66-STA because the electron-donating amino groups could enhance the I − I···π halogen bond interactions compared with the electron-withdrawing carboxyl and sulfonic acid groups. In addition, the pore volume of UiO-66-ATA was significantly higher than those of UiO-66-BTA and UiO-66-STA. In particular, the removal uptakes of UiO-66-ATA were 1108.1 mg/g (vapor phase) and 3601.9 mg/g (aqueous solution). This study is the first to investigate the effects of functional groups on the adsorption uptake of UiO-66 toward iodine. This efficient functional group modification strategy holds significant promise for the development of novel metal–organic framework adsorbents.
研究领域:
材料科学
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环境科学
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核能工程
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DOI
高影响因子
FOOD HYDROCOLLOIDS
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2015
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IF 4.09
Hai-ming Chen,Xiong Fu,Zhi-gang Luo
To investigate the impact of each functional group on the emulsifying properties of sugar beet pulp pectin (SBPP), seven enzymes were studied in a particular order. Compositions of SBPP and enzymatically modified SBPPs were determined, and the structures of SBPPs were characterized by FT-IR. In addition, the contribution of each functional group was evaluated based on the variation in emulsion characteristics. The results showed that protein, ferulic acid-araban/galactan-protein complexes and ferulic acid played important roles in improving the surface activity, emulsifying capacity and emulsifying stability of SBPP and the extent of the decrease in the emulsifying activity followed the order: ferulic acid > ferulic acid-arabinogalactan-protein complexes > protein. The decrease of methyl ester groups mainly affected the particle sizes of the emulsion. In addition to particle sizes, the cream index of the emulsion increased with the hydrolysis of acetyl groups. Arabinose and galactose less affected emulsifying properties than other functional groups.
研究领域:
食品科学
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生物化学
✓ 已验证
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2025
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IF 7.8
Qiang Hu,Junheng Zhang,Yadi Pan,Kuan Ding,Chaoyang Xu,Jinyu Hou,Wuxing Liu,Chanchana Thanachayanont,Thipjak Na Lampang,Meiling Chen,Shu Zhang
The low dissolved oxygen (DO) concentration in groundwater is one of the key challenges limiting the efficiency of aerobic microbial remediation, leading to the development of slow-release oxygen agents such as CaO 2 . Our previous studies have demonstrated that the oxygen content in biochars plays a role in the oxygen release reaction of CaO 2 . This study aims to further investigate the relationship between the oxygen-containing functional groups on biochar surface and oxygen release performance of CaO 2 . Surface oxidation and reduction modifications were employed to regulate the oxygen-containing functional groups on bamboo biochars while minimizing alterations to its physical structure. Results showed that the oxidized and reduced biochars were similar in oxygen content (∼20–22 %) and pore structure (with specific surface area of 8–16 m 2 ·g −1 and average pore size of 10–13 nm). On the contrary, the difference in contents between C-O and O C-O functional groups reached ∼10 %, indicating the successful regulation of the oxygen-containing functional groups. The loading capacity of CaO 2 increases with the increase in C-OH groups in biochars, while the O C-O group is identified as the oxygen-containing functional group that contributes most significantly to accelerating the oxygen release of CaO 2 . The dissolution product hydrogen peroxide (H 2 O 2 ) potentially interacted with biochars to activate free radical synthesis. The yield of hydroxyl radicals (•OH) shows a positive correlation with the oxygen content in biochars, while the production of superoxide radicals (•O - 2 ) is most significantly influenced by the presence of O C-O groups. As a result, the yield of •O - 2 was 216–317 times higher than that of •OH.
研究领域:
环境科学
·
微生物学
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产品关联
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Lei Hu,Jiayi Zheng,Qing Li,Shunhui Tao,Xiaojie Zheng,Xiaodong Zhang,Yao Liu,Xiaoqing Lin
5-hydroxymethylfurfural (5-HMF) is a promising high value-added platform chemical, which can be produced from glucose, fructose, or lignocellulosic biomass via catalysis technology. However, the effective separation of 5-HMF from aqueous solution and actual biomass hydrolysate is still challenging because 5-HMF can be further rehydrated into levulinic acid (LA) and formic acid (FA) under acidic conditions. Herein, the adsorption behavior of glucose and 5-HMF and its follow-up products (LA and FA) from aqueous solutions onto polymeric adsorbents modified with various functional groups (XAD-4, XAD7HP, and XAD761 resins) was systematically investigated. The results showed that XAD761 resin exhibited the highest adsorption selectivity (α5-HMF/glucose = 42.42 ± 5.84, α5-HMF/FA = 18.41 ± 0.50, and α5-HMF/LA = 3.01 ± 0.10) and capacity for 5-HMF (106 mg g–1 wet resin). The adsorption equilibrium was better fitted by the Freundlich isotherm model at the studied range of 5-HMF concentrations. The thermodynamic study and activation energy also revealed that the adsorption process of XAD761 resin for 5-HMF was spontaneous, exothermic, and physical. The kinetic regression results revealed that the kinetic data of 5-HMF was accurately followed by the pseudo-second-order kinetic model. In conclusion, the present study revealed that the potential of phenol formaldehyde resin with hydroxyl groups could be used as an adsorbent for aldehyde organic compounds.
研究领域:
化学工程
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生物质利用
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Jingjing Fang,Shiyu Chen,Yaling Leng,Wen Shi,Gaoxiang Zhang,Yijie Lin,Feili Li
In aquatic ecosystems, dissolved organic matter (DOM) enhances the adsorption of heavy metals onto microalgae by participating in the formation of algae–heavy metal–DOM ternary complexes, thereby increasing environmental risks. The functional groups in the DOM play a crucial role. However, a quantitative description based on these groups is lacking. This study investigates the effects of amino acids (AAs) with varying functional group ratios on the accumulation of lead (Pb) in Chlorella pyrenoidosa ( C. pyrenoidosa ) using batch experiments. Isotherm model fitting, and Fourier transform infrared spectroscopy (FTIR) are employed for characterisation. Results indicate that the addition of AAs facilitated Pb enrichment in microalgae. In particular, incorporating lysine (Lys) led to maximum accumulation, reaching 1.45 mmol g −1 . The adsorption rate decreased after AA addition, particularly with Lys, dropping form 0.0032 g mg −1 min −1 to 0.0009 g mg −1 min −1 . The reaction sequence showed carboxyl groups taking precedence over amino groups. The model developed from the data on Pb adsorption by C. pyrenoidosa following AA addition, demonstrated reliability with an R 2 of 0.91 and an F -value of 157.6. Notably this study employed two-dimensional correlation spectroscopy (2D–COS), offering novel insights into the key roles of functional groups and their distinct contributions. These valuable insights contribute to intensive research on the ternary complex of algae − heavy metal − DOM and elucidating their ecological risks.
研究领域:
环境科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Fei Gao,Zhe Jia,Ya-fei Shan,Yifei Teng,Ying-di Li,Xin-ge Pu
The low-temperature oxidation spontaneous combustion of coal was caused by the active groups in its structure. The oxidation mechanism of carbon and oxygen functional groups in coal had been extensively studied, but there were few reports on the study of sulfur functional groups initiating the coal spontaneous combustion. To investigate the influence of organic sulfur functional groups on the spontaneous combustion of high-sulfur coal and explore its transformation characteristics, the low-temperature oxidation experimental system was used to study the spontaneous combustion tendency of coal with similar metamorphic degrees and different organic sulfur contents. The variations of element forms and organic sulfur functional groups were analyzed by X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy during low-temperature oxidation of coal and model compounds. The results showed that the forms of organic sulfur in coal mainly included mercaptans, thioethers, thiophenes, sulfones (sulfoxides), and sulfates, and the low-temperature oxidation of coal was not only related to the content of organic sulfur but also related to its type. The coal samples, which possess a low content of total sulfur and a small proportion of active organic sulfur groups such as mercaptans and thioethers, had a lower concentration of indicator gas and a smaller tendency to coal spontaneous combustion. After low-temperature oxidation, the content of mercaptan, thioether, thiophene, methyl(methylene), and pyridine in coal decreased, and the content of oxygen-containing groups such as sulfone (sulfoxide), sulfate, carboxyl, and nitrogen oxide increased. The elements of S, C, and N all changed to a high-valent state. In the oxidation reaction of model compounds, mercaptans were more reactive than thiophenes in the low-temperature region, and the oxidation of thiophene could direct form sulfone (sulfoxide), while the oxidation of mercaptan formed disulfide first. It is speculated that low-valence sulfur migrated to a high-valent state by providing sulfhydryl radicals (•SH) and sulfur radicals (C–S•) combined with active oxygen atoms. After the low-temperature oxidation reaction of model compounds, some organic sulfur existed in the form of aromatic sulfur or sulfur oxides and a small part of sulfur escaped as SO2 and H2S gases in the solid oxidation product.
研究领域:
矿业工程
·
化学工程
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2024
·
IF 10.8
Yandi Hu,Xulin Jiang,Suona Zhang,Dawei Cai,Zehao Zhou,Chuan Liu,Xiaobing Zuo,Sang Soo Lee
Iron/chromium hydroxide coprecipitation controls the fate and transport of toxic chromium (Cr) in many natural and engineered systems. Organic coatings on soil and engineered surfaces are ubiquitous; however, mechanistic controls of these organic coatings over Fe/Cr hydroxide coprecipitation are poorly understood. Here, Fe/Cr hydroxide coprecipitation was conducted on model organic coatings of humic acid (HA), sodium alginate (SA), and bovine serum albumin (BSA). The organics bonded with SiO2 through ligand exchange with carboxyl (–COOH), and the adsorbed amounts and pKa values of –COOH controlled surface charges of coatings. The adsorbed organic films also had different complexation capacities with Fe/Cr ions and Fe/Cr hydroxide particles, resulting in significant differences in both the amount (on HA > SA(–COOH) ≫ BSA(–NH2)) and composition (Cr/Fe molar ratio: on BSA(–NH2) ≫ HA > SA(–COOH)) of heterogeneous precipitates. Negatively charged –COOH attracted more Fe ions and oligomers of hydrolyzed Fe/Cr species and subsequently promoted heterogeneous precipitation of Fe/Cr hydroxide nanoparticles. Organic coatings containing –NH2 were positively charged at acidic pH because of the high pKa value of the functional group, limiting cation adsorption and formation of coprecipitates. Meanwhile, the higher local pH near the –NH2 coatings promoted the formation of Cr(OH)3. This study advances fundamental understanding of heterogeneous Fe/Cr hydroxide coprecipitation on organics, which is essential for successful Cr remediation and removal in both natural and engineered settings, as well as the synthesis of Cr-doped iron (oxy)hydroxides for material applications.
研究领域:
环境科学
·
土壤学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）