Minerals
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2021
·Vol. 11
·期 2
·105
·
IF 2.644
Yifan Yang,Shiyong Tao,Zhichun Dong,Jing Xu,Xiang Zhang,Guoyan Pan
Because of the diversification of industries in developing cities, the phenomenon of the simultaneous contamination of various kinds of pollutants is becoming common, and the environmental process of pollutants in multi-contaminated environmental mediums has attracted attention in recent years. In this study,p-arsanilic acid (ASA), a kind of organic arsenic feed additive that contains the arsenic group in a chemical structure, is used as a typical contaminant to investigate its adsorption on iron oxides and its implication for contaminated soils. The adsorption kinetics on all solids can be fitted to the pseudo-second-order kinetic model well. At the same mass dosage conditions, the adsorption amount per unit surface area on iron oxides follows the order α-FeOOH > γ-Fe2O3> α-Fe2O3, which is significantly higher than that for actual soil, because of the lower content of iron oxides in actual soil. Lower pH conditions favor ASA adsorption, while higher pH conditions inhibit its adsorption as a result of the electrostatic repulsion and weakened hydrophobic interaction. The presence of phosphate also inhibits ASA adsorption because of the competitive effect. Correlations between the amount of ASA adsorption in actual soil and the Fe2O3content, total phosphorus content, arsenic content, and organic matter content of actual soil are also investigated in this work, and a moderate positive correlation (R2= 0.630), strong negative correlation (R2= 0.734), insignificant positive correlation (R2= 0.099), and no correlation (R2= 0.006) are found, respectively. These findings would help evaluate the potential hazard of the usage of organic arsenic feed additives, as well as further the understanding of the geochemical processes of contaminants in complicated mediums.Keywords:p-arsanilic acid;iron oxides;soil contamination;adsorption
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2017
·
IF 0
D. Martemianov,B.-B. Xie,T. Yurmazova,M. Khaskelberg,F. Wang,C.-H. Wei,S. Preis
Aqueous arsenic and heavy metals in concentrations exceeding sanitary limits present an acute regional problem. Adsorption is an effective although costly method of pollutants removal. This makes the search for low-cost effective disposable adsorbents necessary. The adsorbents using vermiculite concrete and aerated autoclaved light concrete (aerocrete) modified with iron oxyhydroxide were synthesized and studied. The specimens of adsorbent materials showed the adsorption capacity more than two-fold exceeding the vermiculite-based adsorbents in respect to copper and lead cations, 53 and 195 mg g −1 , respectively, having the adsorption capacity for cadmium comparable to exfoliated vermiculite at 35.5 mg g −1 . Arsenic anions were adsorbed in amounts comparable to the ones of carbon composites-supported ferric oxyhydroxide adsorbents, up to 16 mg g −1 of arsenate. The analysis of adsorption dependent on temperature showed its spontaneous low-energy ion-exchange character. Desorption of heavy metals and arsenic anions from used adsorbents meets the requirements of drinking water standards with the exception of cadmium, meeting the agricultural use standard of 0.01 mg L −1 . The new synthetic adsorbents were found to be cost-efficient, safe and reliable in removal of arsenic anions and heavy metals cations.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
Journal of Environmental Sciences
·
2023
·
IF 6.9
ShuaiLong Wen,JingJing Liu,YueHan Lu,JiaRu Dai,XiuLin Huang,ShiLin An,Erik Jeppesen,ZhengWen Liu,YingXun Du
Dissolved organic matter (DOM) is heterogeneous and exhibits diverse adsorption characteristics with or without the competition of phosphorous (P). Uncertainty persists on how these affect the burial and mobilization of organic carbon and P in aquatic ecosystems. In this work, an algae-derived DOM (ADOM) and a commercial humic acid (HA) with distinct composition were assessed for their adsorption behaviors on iron (oxy)hydroxides (FeOx), in the absence and presence of phosphate. ADOM has less aromatics than HA but more protein-like and highly unsaturated structures with oxygen compounds (HUSO). The adsorption capacity of FeOx was significantly greater for ADOM than for HA. Protein-like and HUSO compounds in ADOM and humic-like compounds and macromolecular aromatics in HA were preferentially adsorbed by FeOx. Moreover, ADOM demonstrated a stronger inhibitory effect on phosphate adsorption than that of HA. This observation suggests that substantial autochthonous ADOM released by algae could increase the internal P loading and difficulty to restore eutrophic lakes. In contrast, phosphate competition can also fractionate ADOM, which suppressing the adsorption of protein-like compounds in ADOM onto FeOx, resulting in an increase in their relative abundance in the post-adsorption ADOM, while reducing the abundance of humic-like compounds. However, phosphate had no discernible impact on the compositional fractionation of HA. Collectively, our results show the source-compositions of DOM influence the immobilization of both DOM and P in aquatic ecosystem via adsorption. The preferential adsorption of proteinaceous compounds in ADOM and aromatics in HA highlighted that the attachment with FeOx could remove their source-specific signatures, partly contributing to universal DOM characteristics across aquatic environments.
研究领域:
环境科学
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水生生态学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Kunlun Yang,Jiasheng Zhou,Zimo Lou,Xurui Zhou,Yuanli Liu,Yizhou Li,Shams Ali Baig,Xinhua Xu
Fe-Mn binary oxides (FMBO) with different Fe/Mn molar ratios were synthesized to investigate the influence of the changed iron oxides forms and the manganese oxide on the removal efficacy of Sb(V) from water under neutral pH. The characterization tests by electron microscopy and X-ray diffraction spectroscopy showed that FMBO gradually changed from granular to aciculiform or fibrous structure and their crystalline degree increased with the decreasing Mn content. The ferric oxides in FMBO transformed from 2-L ferrihydrite-like substance with amorphous state to goethite or lepidocrocite with high crystalline as the amount of added Mn reduced during the preparation. The Sb(V) adsorption rates and capacities of FMBO both decreased and the influence of pH on the Sb(V) removal became greater with the decreasing Mn oxide content. All the results indicated that the addition of Mn could greatly improve the Sb(V) removal performance of FMBO through promoting the formation and preventing the transformation of amorphous ferric oxide in FMBO during the preparation, whose Sb(V) adsorption ability was confirmed to be stronger than that of goethite or lepidocrocite. Further exploration indicated the complexation reaction between Sb(V) and amorphous ferric oxide played a key role in Sb(V) adsorption by FMBO. Meanwhile, FMBO with a Fe/Mn molar ratio of 3:1 (FMBO 3 ) exhibited excellent regeneration performance and the amorphous iron oxide in FMBO 3 gradually transformed into crystalline iron oxide during the consecutive recycling.
研究领域:
环境科学
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水处理
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Huanhuan Wu,Huihui Ding,Jun Ma,Xiang Li,Shuangshuang Huai,Chengming Zhang,Ping Li,Jingjing Xia,Xiaolong Fang,Xiufang Wang
Limited charge transfer and slow oxygen evolution (OER) kinetics significantly impede the practical realization of photoanodes for photoelectrochemical (PEC) water splitting. Here, pn-type-Fe 2 O 3 homojunction photoanode catalysts with P active sites are designed by doping phosphorus (P) into outer lattice of n-type Fe 2 O 3 nanorods (pn-P-Fe 2 O 3 ). The optimized pn-P-Fe 2 O 3 photoanode shows the maximum photocurrent density of 2.61 mA/cm 2 at 1.23 V RHE , and the value is 6.4 times greater than that of pristine Fe 2 O 3 . Experimental and theoretical results clearly show that the P–N homogeneous junctions constructed in Fe 2 O 3 through P-doping increase active sites for H 2 O adsorption and activation, reduce OER reaction energy barrier, and promote effective separation of photogenerated electron-hole pairs and water splitting kinetics. This not only makes the photoelectric water decomposition performance outstanding, but also produces excellent durability. This work provides a novel simple and environmentally friendly strategy for designing effective photoanodes for PEC water splitting.
研究领域:
材料科学
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能源化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2023
·
IF 5.8
Yue Hu,Qing Nie,Xianling Cong,Wen Wu,Qiong Wu,Qihui Liu,Yuanyuan Li,Haiyan Liu,Jingyan Ge,Fangfang Chen
Cancer represents a significant global public health challenge, and conventional cancer therapies such as surgery and chemoradiotherapy are not enough due to the increased complexity of cancer. Nanotechnology has the potential to revolutionize tumor treatments by integrating gene therapy, tumor targeting, and drug delivery. In this study, we demonstrated that Snail2 plays a crucial role in the migration and invasion of lung and liver carcinoma. We proposed a novel approach to synergize the aminated crosslinking dextran coat of superparamagnetic iron oxide nano worms (CLIO-NH 2 , CN) with small interfering Snail2 RNA (siSnail2). The efficiency of siSnail2 delivery was significantly improved by coating CN with N-Isopropylacrylamide-modified polyethylenimine (CNP). In vitro, experiments revealed that CNP@siSnail2 effectively inhibited cancer cell EMT, migration, and invasion. Moreover, CNP@ siSnail2 promoted cancer cell death through various mechanisms, including apoptosis and ferroptosis . The combination of CNP@ siSnail2 and cisplatin significantly improved the anti-tumor effect of the treatment. Animal models demonstrated that the combined treatment of CNP@ siSnail2 and cisplatin resulted in excellent tumor inhibition effects. Our findings provide a potential combined treatment strategy for cancer therapy.
研究领域:
肿瘤学
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分子生物学
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纳米医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2023
·
IF 6.1
Silan Zhao,Lifang Gong,Guangzhao Guo,Huimin Liu,Shuai Li,Lu Dong,Shuang Deng,Hongyun Hu
A large number of fly ash samples from mechanical grate furnaces at a municipal solid waste incineration (MSWI) plant were examined including Se speciation and content. Se leaching behaviors before and after solidification/stabilization(S/S) treatment were comparatively studied. The results showed that Se in the MSWI fly ash was present mainly in the form of selenite with small amounts of physically adsorbed SeO 2 (s). Se in the low alkalinity ash (pH ∼ 7) tended to be more leachable than that in the high alkalinity ash (pH ∼ 12). The chelation treatment would further raise the risk of Se leaching into the environment from the low alkalinity ash (pH ∼ 7). Three Fe-containing additives (zero-valent iron (ZVI)、α-Fe 2 O 3 and Fe 3 O 4 ) were introduced, respectively in attempt to immobilize Se in the low alkalinity MSWI fly ash. A strong positive effect was found with ZVI addition in terms of Se leaching from low alkalinity chelated MSWI ash. Comparatively, iron oxides showed no obvious effect. The adjustment to ash alkalinity (CaO addition) exhibited a comparable effect to ZVI addition, which provided another option to control Se leaching from low alkalinity chelated ash.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Shouhao Tong,Hongyan Wei,Junming Zhou,Yixuan Yang,Runliang Zhu,Qingze Chen,Xiande Xie,Qing Hu,Michael F. Hochella Jr.,Jing Liu
Heterogeneous crystallization of manganese (oxyhydr)oxides (MnOx) on iron (oxyhydr)oxides (FeOx) is crucial for the biogeochemical cycling of Mn, yet atomic-level insights into this process are important but relatively limited. Herein, we revealed the distinct adsorption, oxidation, and crystallization mechanisms of Mn on hematite (Hem), ferrihydrite (Fhy), and goethite (Gth). Gth exhibited highest ability in Mn(II) removal and oxidation, followed by Hem and Fhy. Manganite and hausmannite were the main MnOx products with distinct proportions, and morphologies cross the systems. MnOx growth mechanisms involve surface-induced nucleation, crystallization by particle attachment (CPA), and self-catalyzed growth. On Fhy, self-catalyzed growth was dominant; for Gth, surface-induced nucleation was prevalent, supplemented by CPA; and Hem combined all three mechanisms. These distinct mechanisms led to nanoparticles primarily of hausmannite on Gth and nanowires of manganite and hausmannite on Hem and Fhy, with those on Hem displaying lower aspect ratios. Differences in MnOx structure and morphology were attributed to Mn(II)-FeOx complexation, FeOx electronic band structure, and crystal structure mismatch between MnOx and FeOx, which respectively influenced the direct and indirect electron transfer and heterogeneous nucleation efficiency. This work advances our understanding of MnOx crystallization on FeOx at the nanoscale, explaining the diverse morphology and structure of MnOx in different environments.
研究领域:
环境科学
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材料科学
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地球化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Gao Feiyue,Zhou Chuncai,Cao Yachuan,Yu Yue,Li Yunfei,Liu Guijian
As a highly toxic rare metal, the removal of thallium (Tl) from wastewater has been widely investigated, and adsorption is considered one of the most promising treatment technologies for Tl-containing contaminated water because of its cost-effectiveness, convenience, and high efficacy. In this work, coal tar residue (CTR)-based porous carbon was synthesized through K 2 FeO 4 activation, and applied in adsorbing Tl(I). K 2 FeO 4 could synergistically produce porosity and load iron oxide on the produced porous carbon surface because of the catalytic cracking and oxidative etching during the activation of CTR. The adsorbent was synthesized at 800 ℃ with a mass ratio of K 2 FeO 4 /CTR being 3 (PC 3–800 ) showed optimal Tl(I) adsorption performance. The removal efficiency and distribution coefficient of PC 3–800 were above 95 % and 10 4 mL/g, respectively, in a wide pH range (4−10). Furthermore, the selection and reusability of PC 3–800 were favorable. The adsorption was a spontaneous, exothermic, and entropy increase process. The adsorption process was dominated by electrostatic attraction, surface complexation, and surface oxidation . The results suggested that removing Tl(I) from contaminated water via CTR-based porous carbon was feasible.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Research Express
·
2017
·Vol. 4
·期 4
·045006
·
IF 1.068
Hongtao Cui,Li Wang,Min Shi,Yanhong Li
In this work, lepidocrocite (γ-FeOOH) nanobundles were prepared by a facile NH4F assisted epoxide precipitation route. The reactions between epoxide and [Fe(H2O)6]2+ promoted the hydrolysis and condensation of [Fe(H2O)6]2+, resulting in the formation of iron oxyhydroxide. After calcination of γ-FeOOH nanobundles at 400 °C, the produced α-Fe2O3 still kept the bundle morphology. Due to the unique chemistry of epoxide, the morphology and phase of iron oxide polymorph nanoparticles (goethite, akaganeite, lepidocrocite, magnetite) were well-controlled through controlling reaction conditions such as Fe2+ concentration, NH4F additive and reaction temperature. It is particularly interesting that NH4F working as phase controlling agent is able to control the phase development of iron oxyhydroxides. This phase control effect of NH4F is attributed to the promoted reaction rate of epoxide originating from the higher electronegativity of fluoride ions than chloride ions. Based on the results in this work and our other preliminary works, it is considered that this route can be used as a general strategy for controlling the morphology and phase of transition element compounds.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Jieling Ren,Yuanzhe Peng,Aibin Zhu,Chunli Zheng,Chi He,Mudi Ma
Kaolinite-loaded amorphous zero-valent iron composite (K@AZVI) is a promising material for cadmium-contaminated soil remediation. Still, the impact of iron (Fe) oxides on the surface of K@AZVI on the immobilization of cadmium (Cd) in soils caused by varying water management remains unclear. Hence, this study investigated the transformation of Fe oxides in K@AZVI and their effects on Cd morphology under varying soil water management (drying, wetting, and flooding). The results indicated that under K@AZVI treatment, the pe + pH (pe = Eh (oxidation-reduction potential, mV) / 59.2) values decreased from 11.59 to 9.83 and 5.61 with increased soil water management. Meanwhile, the content of crystalline Fe oxides (Fe c ) decreased significantly by 34.02%-72.76%, while the content of amorphous Fe oxides (Fe o ) increased by 29.01%-55.20%. This transformation from crystalline to amorphous Fe oxides significantly enhanced the immobilization of Cd, resulting in a 30.30%-64.59% reduction in the available Cd content compared to the control. In addition, the proportion of low active Cd was enhanced from 32.94% to 56.10%, further indicating that K@AZVI exhibited superior immobilization in flooded soil. Characterization and calculations showed that water management significantly improved the immobilization of Cd by K@AZVI by regulating the crystallinity of Fe oxides and enhancing their electron transfer rate and adsorption capacity. Therefore, investigating the morphological transformation of Fe under varying water management will help us to understand the mechanism of Fe redox-mediated Cd transport and transformation in the soil system.
研究领域:
环境科学
·
土壤学
✓ 已验证
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2024
·
IF 8
Xuelian Xia,Xu Han,Yuanzheng Zhai
In aquifers, the sequestration and transformation of organic carbon are closely associated with soil iron oxides and can facilitate the release of iron ions from iron oxide minerals. There is a strong interaction between dissolved organic matter (DOM) and iron oxide minerals in aquifers, but the extent to which iron is activated by DOM exposure to active iron minerals in natural aquifers, the microscopic distribution of minerals on the surface, and the mechanisms involved in DOM molecular transformation are currently unclear. This study investigated the nonbiological reduction transformation and coupled adsorption of iron oxide minerals in aquifers containing DOM from both macro- and micro perspectives. The results of macroscopic dynamics experiments indicate that DOM can mediate soluble iron release during the reduction of iron oxide minerals, that pH strongly affects DOM removal, and that DOM is more efficiently degraded at low rather than high pH values, suggesting that a low pH is conducive to DOM adsorption and oxidation. Spherical aberration-corrected scanning transmission electron microscopy (SACTS) indicates that the reacted mineral surfaces are covered with large amounts of carbon and that dynamic agglomeration of iron, carbon, and oxygen occurs. At the nanoscale, three forms of DOM are found in the mineral surface agglomerates (on the surfaces, inside the surface agglomerates, and in the polymer pores). The microscopic organic carbon and iron mineral reaction patterns can form through oxidation reactions and selective adsorption effects. Fourier transform ion cyclotron resonance mass spectra indicate that both synergistic and antagonistic reactions occur between DOM and the minerals, that the release of iron is accompanied by DOM decomposition and humification, that large oxygen- and carbon-containing molecules are broken down into smaller oxygen- and carbon-containing compounds and that more molecules are produced through oxidation under acidic rather than alkaline conditions. These molecules provide adsorption sites for sediment, meaning that more iron can be released. Microscopic evidence for the release of iron was acquired. These results improve the understanding of the geochemical processes affecting iron in groundwater, the nonbiological transformation mechanisms that occur at the interfaces between natural iron minerals and organic matter, groundwater pollution control, and the environmental behavior of pollutants.
研究领域:
环境科学
·
地质学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）