ENVIRONMENTAL POLLUTION
·
2022
·
IF 9.988
Teng Xu,Xiaofeng Jiang,Yuling Tang,Yunhang Zeng,Wenhua Zhang,Bi Shi
Trivalent chromium [Cr(III)] and tannins serve as necessary substances in leather processing and coexist in tannery site, which lead to the chromium contamination in site soil when disposed improperly. However, coexisting tannins are very likely to complex with Cr(III) and affect its properties, ultimately changing the mobility of chromium in soil. In this study, tannic acid (TA) was selected to investigate the complexation with Cr(III) and the influence on the solubility and sorption of Cr(III) in soils. Then, the transport behavior and mechanism of Cr(III)-TA complexes in soil was clarified. Dialysis results showed that the increase of TA concentration and solution pH promoted the formation of complexed Cr(III). The results of UV–Vis absorption spectroscopy , X-ray photoelectron spectroscopy, and density functional theory calculations indicated that the adjacent ionized phenolic hydroxyls in TA functioned as the binding sites with Cr(III) to form the Cr–O bonds and the degree of complexation increased with pH. The Cr(III)-TA complexes had higher solubility than free Cr(III) at pH ≥ 6.0. Batch sorption experiments demonstrated that the sorption capacity of Cr(III)-TA to soils with different pH was always lower than that of free Cr(III). These reasons led to the stronger mobility of Cr(III)-TA in soil columns than Cr(III). Our research reveals that the enhanced mobility of Cr(III) in soils coexisting with TA.
研究领域:
环境科学
·
土壤学
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL TECHNOLOGY
·
2024
·
IF 2.2
Yuejin Liu,Xiaojun Niu,Dongqing Zhang,Lingling Zhou,Chunyang Tao,Yu Lin,Siping Chen,Yawen Chen,Zhang Lin,Suying Kong
Flocculation is one of the most significant conditioning methods for sludge dewatering. In the study, a novel flocculant CS–TA, prepared through free radical-mediated conjugation of tannic acid (TA) and chitosan (CS), was proposed to improve sludge dewatering. The characterisation using Fourier transform infra-red spectroscopy and X-ray diffraction analysis shows that the CS chain was the backbone of CS–TA, and the presence of CS–TA aromatic rings confirmed the conjugation of CS with TA. Moreover, the conditioning of CS–TA yielded the best dewatering performance at 30 mg g TS−1 with the water content of sludge cake by press filtration (Wsc) of 59.78% ± 0.3% and capillary suction time (CST) of 11.8s ± 0.35 s, compared to 98.2% ± 0.15% and 56.2 s ± 0.16 in raw sludge. The results of different influencing factors (e.g. pH and temperature) on flocculation efficiency indicated that CS–TA possessed the capacity for enhancing sludge dewaterability over a wide range of pH, and the optimal temperature was observed to be 35 °C. Furthermore, the increase of particle size and zeta potential implied the addition of CS–TA favoured the formation of larger particles charge neutralisation and adsorption bridging effect. In addition, extracellular polymer substances (EPS) analysis indicated that the decrease in the polysaccharide and protein contents in EPS after CS–TA addition could increase the relative hydrophobicity of sludge. Moreover, the contents of heavy metals in sludge and their leaching toxicity and environmental risk were reduced. This study provides comprehensive insights into the exploration of CS–TA for sludge dewatering and the maintenance of ecological security in an eco-friendly.
研究领域:
环境科学
·
污水处理
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Guangzhi Xu,Chen Liu,Aiyun Hu,Shan Wang,Haijun Wang
With the increasing demand for fossil energy and carbon resources, improving the efficiency of fossil resource utilization and exploring new ways of carbon resource utilization have become the key issues facing social development. Here, we successfully synthesized zirconium tannate(Zr-TA) from tannic acid(TA) and zirconium tetrachloride(ZrCl 4 ) for catalytic transfer hydrogenation(CTH) of furfural(FF) to furfurfuryl alcohol(FA) with 100 % conversion of FF and 98.2 % yield of FA at 120 °C for 80 min. The physical properties of the catalysts and the optimum conditions for hydrogenation reaction were explored through different characterization techniques and experiments. In addition, the Zr-TA could be recycled eight times without significant loss of activity and possible reaction mechanism were proposed.
研究领域:
化学工程
·
催化材料
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yanda Qian,Peng Wan,Andrew S. Hursthouse,Guocheng Zhu
Nitrogen pollution poses a significant threat to aquatic ecosystems, necessitating the deployment of effective water treatment strategies to mitigate its levels. Given the scarcity of traditional nitrogen adsorbents in the water treatment sector, this study explored the potential of titanium tannate, a metal-phenolic network (MPN) material, as a carrier for nitrogen removal. Specifically, a novel composite material, zero-valent iron/titanium tannate (nZVI/Ti-TA), was synthesized through a liquid-phase reduction reaction method and subsequently assessed for its nitrogen removal efficacy in batch experiments. The results showed that nZVI/Ti-TA is a dual-functional composite, exhibiting both adsorption and reduction capabilities. The optimal preparation parameters were determined to be a mass ratio of Ti-TA to FeSO 4 •7H 2 O of 1:1.5 and a molar ratio of NaBH 4 to FeSO 4 •7H 2 O of 8. Furthermore, the composite exhibited a broad pH application range, maintaining stable performance across a pH range of 4 to 9. Additional parameters, such as nitrogen concentration, adsorbent dosage, and the presence of ions, also influenced the treatment outcomes. Specifically, higher nitrogen concentrations and lower adsorbent doses resulted in a higher adsorption capacity. Conversely, higher concentrations of ions like SiO 3 2− , CO 3 2− , and K + inhibited nitrogen separation. However, the composite demonstrated promising results in treating inorganic and organic nitrogen in real wastewater samples. In model solutions, inorganic nitrogen could be completely removed, while in field applications such as domestic wastewater, the total nitrogen removal rate exceeded 95 %. The primary mechanisms underlying nitrogen removal were the dual functions of adsorption by Ti-TA and reduction by nZVI. The adsorption process was primarily governed by hydrogen bonding and electrostatic interactions. Overall, this study introduces a novel composite material for effective removal of nitrogen, offering a promising solution to the pressing issue of nitrogen pollution in aquatic ecosystems.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Ruoyun Lin,Fangjie Lv,Hao Zhang,Yang Li,Jiangang Lu,Jiansheng Li
Efficient removal of multiple pollutants from discharged antibiotic wastewater effluents by a single processing unit is highly desirable, yet challenging. In this study, intrinsically synergizing Fenton oxidation and in-situ coagulation were achieved in the tannic acid (TA)/Fe(III)/H 2 O 2 process, demonstrating the simultaneous removal of multiple pollutants over a wide pH range. Under the optimal conditions (TA/Fe(III)/H 2 O 2 = 25 mg/L/0.1 mM/0.5 mM), 95.43 % of SMR and 98.41 % of turbidity were simultaneously removed at pH = 7. Moreover, the applicability of this process was validated by treating a spiked actual secondary effluent. Compared with polymer ferric sulphate coagulation and conventional Fe(II)/H 2 O 2 Fenton, TA/Fe(III)/H 2 O 2 process exhibited significantly enhanced removal performance in terms of SMR, COD, UV 254 and turbidity without any pH adjustment. The mechanism analysis revealed that the introduction of TA can not only promote the iron redox cycle for the production of ∙OH, but also neutralize the charge for the generation of the porous flocs. Due to the bridging of TA, the synergy of Fenton oxidation and in-situ coagulation was achieved in a single processing unit. Finally, the synergy mechanism proposed that a four-step process sequentially proceeded during the treatment. This study may provide new insights into the simultaneous removal of multiple pollutants in the advanced treatment of refractory industrial wastewater.
研究领域:
环境科学
·
废水处理
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产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 31
·17151-17158
·
IF 2.936
Qionglin Luo,Shunqin Zeng,You Shu,Zaihui Fu,Hongran Zhao,Shengpei Su
A polystyrene-hollow sphere catalyst was prepared by treating polystyrene-encapsulated calcium carbonate particles with concentrated hydrochloric acid. This catalyst was characterized using TGA, FT-IR, optical microscope, SEM-EDX and XPS. Evidences from SEM-EDX and XPS analyses indicated that the sulfonate groups were on the inner surface of the polystyrene hollow sphere. The polystyrene hollow spheres were used as catalyst in the hydrolysis of tannic acid. Reaction conditions including the reaction temperature and time, loading of catalyst, ratio of tannic acid to H2O and number of recycles were optimized. A high yield of gallic acid was obtained as the reaction performed under the following conditions: a temperature of 80 °C, a molar ratio of tannic acid to H2O of 1 : 3, and a catalyst loading of 7% w/w (based on the mass of tannic acid). This catalyst showed excellent catalytic performance, easy separation, high stability and good reusability. This work provides a new strategy for the controllable synthesis of polystyrene hollow structures with sulfonic groups on the inner surface and an excellent and prospective catalyst for the production of gallic acid through hydrolysis of tannic acid.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Dongxue Guo,Yirong Xiao,Tong Li,Qingfeng Zhou,Liguo Shen,Renjie Li,Yanchao Xu,Hongjun Lin
Inspired by the mussel adhesion mechanism, plant polyphenol tannic acid (TA) with abundant catechol groups and hydrophilic Jeffamine (JA) containing amino groups were used in a layer-by-layer (LBL) process to fabricate composite nanofiltration (NF) membranes in this study. Alternately immersing a polyacrylonitrile substrate into individual TA and JA buffer solutions could readily construct a NF membrane selective layer without any pre-treatment to the substrate. The optimised membrane showed a high pure water permeance of 37 L m −2 h −1 bar −1 whilst maintaining rejections higher than 90% towards various dyes with molecular weights ranging from 269 to 1017 g mol −1 . Particularly, the obtained membrane exhibited excellent anti-fouling and long-term performance attributed to the hydrophilic membrane surface and covalent bonds in the selective layer. The novel strategy inherited the advantages of a mussel-inspired dopamine material but overcame its disadvantages. The results disclosed in this study not only provide a novel strategy to prepare composite NF membranes, but also facilitate the mussel-inspired LBL design of advanced materials for environmental applications.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
PubMed
高影响因子
CEMENT AND CONCRETE RESEARCH
·
2025
·
IF 13.1
Minghui Jiang,Xiao Liu,Shiyu Li,Yurui Xu,Simai Wang,Lei Lu,Xinxin Li,Xinru Sun,Chunlei Xia,Ziming Wang,Suping Cui
The internal water migration within calcium silicate hydrate (C-S-H) in dry environments is considered to be the primary factor affecting the volume stability of cementitious materials. In this research, the in-situ polymerization product of plant polyphenol tannic acid (TA) was applied to modify C-S-H based on an organic-inorganic composite modification method. The chemical structure, microstructure, composition, dimensional changes and water migration characteristics of modified C-S-H were analyzed. Experimental results showed that TA improved the polymerization degree of siloxane chains in the C-S-H nanostructure, with a maximum improvement of 80.70%, and increased the interlayer spacing in the C-S-H structure, confirming the modification of C-S-H at the nanoscale, exhibited by 29 Si Nuclear Magnetic Resonance (NMR), X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM). This modification by TA optimized the C-S-H nanostructure and microscopic pores, and increased the interlayer and gel pore water content, especially gel pore water increased by 56.53% compared to that of the unmodified C-S-H, revealed by nitrogen adsorption and 1 H LF-NMR. In the dry environment, the blocking and cladding effects of TA on C-S-H effectively inhibited the gel water loss and reduced the drying shrinkage, especially at low TA concentration. This research aims to improve the volume stability of C-S-H by in-situ polymerization product of plant polyphenol, which provides new insights into improving the volume stability of cementitious materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Qianqian Chang,Boqiang Gao,Hu Yang
In this work, a series of novel composite adsorbents (k-TAFe) was designed and fabricated through a one-step method, that is, the chelation crosslinking of tannic acid, kaolin particles and different contents of Fe(III). k-TAFe had a high efficiency in adsorption of various fluoroquinolones antibiotics (FQs) from water. The detailed performance of k-TAFe in FQs adsorption, including the influences of Fe(III) content, solution pH, inorganic and organic additives, adsorption time and FQs' concentration, has been investigated systematically using ofloxacin (OFL), one of popular FQs, as an example. The maximal OFL uptake of k-TAFe was 0.405 mmol/g at an initial pH of 6.0. On the basis of the analysis of the x-ray photoelectron and fourier transform-infrared spectra before and after adsorption, the comparison in the apparent performance of k-TAFe in adsorption of seven FQs with similar structures and their two sub-structural analogs, and theoretical calculation, multiple adsorption mechanisms, including chelating effect, hydrogen bonding, electrostatic attraction , and π-π electron–donor–acceptor interactions, were involved and discussed in detail. Among them, chelating effect due to Fe(III) played a key role in OFL adsorption, and the addition of kaolin particles synergistically enhanced Fe(III) fixed on the composite adsorbents, increased the Fe(III) contents, and caused an improved OFL uptake of k-TAFe. Because of the evident advantages of environmental-friendliness, high adsorption performance and low cost, k-TAFe as an efficient adsorbent has notable application potentials in removal of FQs from water.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2017
·
IF 4.233
Chenhu Zhang,Sun Wei,Yuehua Hu,Honghu Tang,Jiande Gao,Zhigang Yin,Qingjun Guan
Selective adsorption of tannic acid (TA) on calcite surfaces and the implications of this process for the separation of fluorite ore were studied by microflotation tests, surface adsorption experiments, zeta potential measurements, UV–vis analysis, and X-ray photoelectron spectroscopy (XPS) analysis. The microflotation tests indicated that TA, when added before sodium oleate (NaOl), could selectively depress calcite from fluorite at pH 7. Surface adsorption experiments revealed that TA hinders the interaction of NaOl with calcite. The zeta potential of calcite became more negative with TA than with NaOl. However, the characteristic features of TA adsorption were not observed on fluorite, suggesting that the dominant adsorption sites are dissimilar on the fluorite and calcite surfaces in the pulp. UV–vis spectroscopy, XPS, and solution chemistry analysis were utilized to obtain a better understanding of the mechanism for selective adsorption of TA as well as the key factors determined by the Ca 2+ and Ca(OH) + components on the mineral surfaces. A possible adsorption mechanism along with an adsorption mode is proposed for the surface interaction between TA and calcite.
研究领域:
矿物加工工程
·
表面化学
·
胶体与界面科学
·
资源利用
·
浮选化学
✓ 已验证
DOI
高影响因子
SYNTHETIC METALS
·
2020
·
IF 3.286
Lei Hu,Limin Zang,Wusheng Zuo,Qifan Liu,Chao Yang,Chunliu Liang,Jianhui Qiu
The acquisition of high energy density for aqueous supercapacitors (SCs) is effective in extending the operating voltage and increasing the capacitance, which has drawn a great deal of attention in recent years. A scalable approach has been proposed by dip coating and carbonizing tannin-Fe 3+ (TA-Fe 3+ ) coordination compounds to prepare fabric electrodes, which can provide tannin carbon (TC) and Fe 3 O 4 for extended voltage windows and high specific capacitances, respectively. A fabric electrode with a chemically stable carbon core-shell structure was shown to improve its decomposition overpotential of water, which contributed to a wide operating voltage of 2.4 V for aqueous symmetric supercapacitors (SSCs). The assembled all solid-state SSCs achieved both an ultrahigh energy density of 51.26 μWh cm −2 , which was higher than most SSCs and even some asymmetric SCs, and the ability to connect them in series to function as practical energy storage devices. This work opens up the possibility for high operating voltage aqueous SCs and even more possibilities for SCs.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Jun Guo,Dong An,Yue Hu,Yunkun Qian,Jiaxin Ma,Yijun Shi,Jiaxiu Song,Chao Liu
The interaction by which sludge proteins bind to conditioners significantly impacts sludge dewatering performance. Nonetheless, a limited understanding of the interaction mechanisms restricts the elucidation of the dewatering process. This study proposes a molecular-level, covariant binding mechanism based on the analysis of the heterogeneity, response sequence, and active site of sludge protein-tannic acid (TA) binding. It utilizes fluorescence spectroscopy and two-dimensional correlation spectroscopy (2DCOS) in combination with fluorescence resonance energy transfer (FRET) theory. The disruption of soluble extracellular polymeric substances (S-EPS) resulted in the exposure of internal EPS, facilitating sludge dewatering. The C-O groups in polysaccharides and proteins within S-EPS were linked to TA before the N-H in amide II. However, the N-H bond in loosely bound EPS preferentially binds to TA. Likewise, higher TA doses (≥0.3 mM/g TS) shifted the characteristic peak wave number. Protein substrates were transformed and exposed many groups with higher reactivity towards TA, which means TA concentration also affected their binding sites to proteins. In addition, utilizing the Tachiya model with FRET theory corroborated the existence of non-radiative energy transfer. The combination of spectroscopy and mathematical model represents an ideal approach for obtaining molecular-level mechanisms underlying sludge dewatering, thus providing an effective strategy for sludge disposal.
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
危险品化学品经营许可证（带存储）