CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Rihong Xiao,Yili Zhang,Shuzhou Wei,Xing Chuai,Xiangzheng Cui,Zhuo Xiong,Junying Zhang,Yongchun Zhao
Massive Hg emissions from coal-fired units cause serious environmental pollution and result in a substantial waste of Hg resources. In this study, the prepared millimeter-grade Se/SiO 2 adsorbent was applied as a filler to adsorb mercury in a fixed-bed reactor to obtain the high value-added product HgSe, which solved the problem of short contact time and secondary pollution caused by the traditional injection mercury removal adsorbents. Experimental Hg removal showed that the 25 % Se-loaded adsorbent exhibited excellent Hg removal performance at 150 °C, with a saturation adsorption capacity of mercury was as high as 101.04 mg/g, nearly 300 times that of commercial activated carbons. Additionally, the influence of the flue gas composition on the Hg removal performance of Se/SiO 2 was studied. The results showed that O 2 , NO, and HCl increased the efficiency of Hg removal and SO 2 and SO 3 had trivial impact on the Hg removal performance. The Hg temperature-programmed desorption test results showed that the adsorbed Hg appeared predominantly as HgSe on the sample surface. DFT calculations verified that Se loading improved Hg removal performance and defined the adsorption mechanism. Moreover, the prepared Se/SiO 2 adsorbent carrier was soluble SiO 2 , which provided a good condition for the subsequent high-purity collection of HgSe. Finally, the technological process of Hg removal via Se-loaded adsorbents and the recovery of HgSe were proposed, which could offer a new way to achieve the resource utilization of Hg.
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
JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Elvis Ikechukwu Nosike,Zhenqi Jiang,Lijing Miao,Ozioma Udochukwu Akakuru,Bo Yuan,Shasha Wu,Yuenan Zhang,Yujie Zhang,Aiguo Wu
This research reports a new mercury adsorbent in which Fe 3 O 4 as a core was embedded into the shell of ZIF-90 in a one-pot synthesis and the subsequent post synthesis modification (PSM) of its surface with cysteine covalently, via a Schiff’s base reaction. Poly acrylic acid (PAA) was capped on the surface of nanoparticles to prevent agglomeration of the nanoparticles. In addition, −COOH groups of PAA coordinated with Zn 2+ of ZIF-90 and this provided the platform for ZIF-90 to grow on the nanoparticles forming the core-shell structure. Based on the strong interactions between the thiol groups on the adsorbent and mercury ions as elucidated by the XPS analysis, the as-synthesized adsorbent showed selectivity for Hg 2+ . The sorbent exhibited high adsorption capacity of 900 mg g −1 towards Hg 2+ as calculated at pH 4 and the adsorption kinetics followed pseudo-second-order kinetics model better. The Hg 2+ loaded adsorbent was easily regenerated and it maintained about 70 % efficiency after the third use. Low-cost, readily available and green materials, facile preparation, efficient removal and the breakthrough in three times recyclability give the novel ZIF-90 based hybrid nanoadsorbent wide prospects in the field of environmental remediation as a good adsorbent for Hg 2+ removal in wastewater.
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
JOURNAL OF POLYMERS AND THE ENVIRONMENT
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2024
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IF 4.7
Yu Xiaoqi,Ma Xiaojun,Pan Ziming,Ma Xiaoyun,Ji Xinglong,Lv Yin,Wei Zhong
Hydrogels with high mechanical properties and excellent adsorption capacity are expected in wastewater treatment. Herein, 3D porous hydrogels were prepared by free radical copolymerization using carboxymethyl cellulose nanofibers (CNFs) grafted with N, S atom doped carbon quantum dots (N, S-CDs) and 1-Allyl-2-thiourea. N, S-CDs introduced in the hydrogel can uniformly disperse and increase the adsorption site of Hg(II) by grafting method. Meanwhile, the good mechanical strength of N, S-CDs is beneficial to improve the hydrogel mechanical properties. The experimental results show that the 3D porous hydrogel has great swelling properties (SR = 875.22 g/g) and mechanical properties (elastic modulus = 86.77 MPa). Moreover, compared with the hydrogel without N, S-CDs, the 3D porous hydrogel has an excellent Hg(II) adsorption capacity (943.77 mg/g). In addition, the 3D porous hydrogel has outstanding regeneration performance. The adsorption capacity accounts for 94.6% of the first adsorption capacity after 5 cycles. Therefore, the 3D porous hydrogels are considered as a promising adsorbent for the hazardous Hg(II) absorption.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
·
IF 10.753
Ye Qiu,Zhanhua Zhang,Tong Zhang,Ping Zhang
Microplastics (MPs) tend to accumulate and undergo a sulfur weathering process that leads to significant surface changes in sulfur-rich anaerobic environments, such as sewage and wastewater treatment plants . Aged MPs can have a profound impact on environmental behaviors of various toxic pollutants , especially heavy metals. Although previous studies have investigated the adsorption characteristics of metal ions on MPs that are aged in aerobic environments, the sorptive interactions of sulfur-aged MPs in anaerobic environments with mercury, i.e., Hg(II), are largely unknown. In this study, laboratory investigations were conducted to study the sorptive behaviors of Hg(II) by six common MPs treated anaerobically in the presence of sulfide. Adsorption isotherms show that the sulfur aging process greatly enhances the MP sorption capacity of Hg(II). The mechanisms including changes in the specific surface area, electrostatic interactions, surface precipitation, and surface functional groups are responsible for the enhanced adsorption capacities of sulfur-aged MPs. The thiol group that forms on the MP surface plays a dominant role in enhancing the MP adsorption capacity of Hg(II), which is determined by the formation of unsaturated bonds in the molecular chains of MPs. Furthermore, the pathways of surface chemical transformation of MPs during sulfur aging have been proposed. This study promotes our understanding of the potential hazard of MPs as well as the fate and transport of heavy metals in the presence of aged MPs.
研究领域:
环境科学
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污染生态学
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DOI
高影响因子
CHEMOSPHERE
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2017
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IF 4.208
Yue Sun,Dan Lv,Jiasheng Zhou,Xiaoxin Zhou,Zimo Lou,Shams Ali Baig,Xinhua Xu
In this study, a comparative evaluation of synthetic FeS and natural pyrite was performed to investigate their adsorptive potentials toward Hg(II) in aqueous system. Characterization analyses such as BET, SEM and TEM suggested that FeS had porous structures with abundant active sites, while pyrite with a hard and smooth surface relied mainly on surface adsorption to immobilize Hg(II). Results of batch tests revealed that FeS offered much greater Hg(II) maximum adsorption capacity (769.2 mg/g) as compared to pyrite (9.9 mg/g). Both iron sulfides showed high removal efficiency (>96%) with the initial Hg(II) concentration (1 mg/L) at pH = 7.0 ± 0.1, and the effluent could meet the permissible effluent concentration (<50 μg/L). Condition experiments (such as pH, co-ions) proved that the adaptive capacity of FeS was significantly higher than that of pyrite. A pseudo-second-order kinetic model was better able to illustrate the sorption kinetics on both FeS and pyrite (R 2 ≥ 0.9992). XRD and XPS analyses supported that precipitation, ion exchange and surface complexation were main reaction mechanisms involved in the adsorption process. In addition, it was also revealed that the structural changes of FeS before and after adsorption was much larger than pyrite. Findings from this study suggest FeS is a promising candidate for treatment of high-concentration Hg(II)-containing wastewater (<20 mg/L), while pyrite can be applied as a long-term adsorbing material in the immobilization of wastewater containing low Hg(II) concentration (<1 mg/L) due to its cost-effective property and local availability.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Kanagaraj Rajalakshmi,Selvaraj Muthusamy,Meng Xie,Yun-Sik Nam,Byeong-hyeon Lee,Kang-Bong Lee,Yuanguo Xu,Jimin Xie
The accumulation of mercury in the food chain and environment is harmful to living beings. This raises the need for high affinity, reusable cost-efficient adsorbents for mercury. Herein, we report a side chain entanglement free hetero atom effect bearing covalent organic framework MTF prepared by integrating melamine and thiophene linker. The AA stacked MTF-2 was prepared via transformation strategy from its AB stacked MTF-1 congener. The MTF-1 and MTF-2 were comprehensively analyzed through PXRD, SEM, TEM, 13 C CP/MAS, N 2 sorption and mercury removal efficiency. The adsorption capacity of MTF-2 revealed a value of 540 mg g −1 , which is greater than that of MTF-1 (328 mg g −1 ). The adsorption mechanism was studied through XPS, 13 C CP/MAS and XAFS indicating probable coordination of Hg 2+ with both the triazine and sulfur moieties in a cooperative manner. To demonstrate the role of aromatic triazine ring, the analogous aliphatic triaminoguanidine was selected and the removal efficiencies between triaminoguanidine-thiophene COF (TAG-TF) and MTF-2 were compared. It revealed that the triazine unit containing MTF-2 showed 2.2 times greater removal efficiency than TAG-TF. The results reveal the structure-performance relationship, where the high surface area and relatively ordered functional moieties both paly a synergistic role in efficient mercury adsorption.
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
Polymer Chemistry
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2019
·Vol. 11
·期 4
·810-819
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IF 4.76
Akram Yasin,Yurong Chen,Yanxia Liu,Letao Zhang,Xingjie Zan,Yagang Zhang
Different from traditional polyethylenimine (PEI) modified Hg(II) adsorbent materials, a novel hyperbranched polythioamide adsorbent (SPD) was prepared by using sulfur, PEI and 1,4-diethynylbenzene (DEB) as monomers. There are tens and thousands of tons of sulfur produced from oil refinery processes as a major by-product each year, and its utilization becomes a concern due to its limited consumption, environmental problems and safety. Herein, a SPD was fabricated through a one-pot, catalyst-free polymerization which even can be solvent-free via using sulfur to solidify the liquid PEI. A kinetic study showed that the adsorption of Hg(II) ions followed the pseudo-second-order model, indicating chemical adsorption between Hg(II) ions and SPD. The SPD had a maximum adsorption capacity of 1161.99 mg g−1. FT-IR and XPS measurements indicated that the removal of Hg(II) by SPD was mainly controlled by the coordination interaction between Hg(II) ions and nitrogen groups (i.e., amine and imine groups), and also CS bonds of SPD. By using elemental sulfur, PEI becomes the backbone of the polymer system by forming –C(S)NH– and –C(S)N< groups unlike the grafted part of traditional PEI modified materials. TG, DTG, and DSC measurements showed that the main degradations occurred at around 160 °C and 360 °C.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2015
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IF 2.711
Lytuong Tran,Pingxiao Wu,Yajie Zhu,Shuai Liu,Nengwu Zhu
A novel approach to prepare adsorbents for Hg(II) uptake from aqueous media based on the grafting of dimercaprol (BAL), containing thiol and hydroxyl groups, onto the natural montmorillonite and vermiculite was investigated concerning the evaluation of the adsorption capacity. The kinetic study showed that the adsorption process abided by pseudo-second-order model. The adsorption behavior of Hg(II) onto the obtained samples fitted well with Langmuir isotherm model, exhibiting an enhanced maximum adsorption capacity of 8.57 and 3.21 mg g −1 for BAL-Vm and BAL-Mt, respectively. The feasibility of Hg(II) uptake onto the the samples was studied thermodynamically and the calculated coefficients such as Δ H , Δ S and Δ G indicated a physical and spontaneous process. The pH values and coexisting cations had a great influence on Hg(II) removal, confirming the optimal pH value of 4.0–5.0 and the negative correlation between the ionic strength and the adsorption capacity of Hg(II). In general, BAL-Vm possessed a higher efficiency of Hg(II) uptake than BAL-Mt, contrary to that of the pristine clays. The pristine and functionalized materials were investigated by XRD, FTIR, BET, SEM and zeta potential analysis to gain in-depth insight into the structure and surface morphology. The results showed that BAL was successful grafted on montmorillonite and vermiculite surface, providing plentiful adsorption sites as chelating ligands. The mechanisms of Hg(II) adsorption on these samples could be further explained as ion exchange and electrostatic attraction for Vm and Mt, and formation of complexes for BAL-Vm and BAL-Mt.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2017
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IF 4.233
Bing Tan,Huimin Zhao,Yaobin Zhang,Xie Quan,Zehao He,Wenting Zheng,Bingyu Shi
Phytic acid (PA) induced graphene macrostructures were synthesized and investigated for the sorption characteristics and mechanisms of mercury. The as-synthesized graphene foam possessed large specific surface area and amphiphilicity. FTIR and XPS analysis revealed that the as-prepared graphene macrostructure retained oxygen-containing functional groups after hydrothermal reduction and also captured new phosphorus-containing groups because of the introduction of PA. Different experimental parameters, such as pH, PA fractions and contact time were applied to probe into the Hg(II) adsorption performance of as-synthesized macrostructure. Pseudo-second-order kinetic model and Langmuir isotherm model fitted well to the obtained sorption kinetic and isothermal data. The maximum adsorption capacity at pH = 7.2 for mercury was 361.01 mg/g. The dominant mechanisms for mercury removal were mainly ion exchange and surface complexation. Real application in river water and seawater exhibited very promising results, indicating its broad prospect in water purification .
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Applied Sciences-Basel
·
2022
·Vol. 12
·期 8
·3769
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IF 2.838
Wei Ma,Dong Ye,Haining Wang
Herein, a series of Co-Fe mixed oxide modified ZSM-5 adsorbents were synthesized using the ultrasonic-assisted impregnation method for the capture of elemental mercury. In comparison with other samples, Co4Fe1-ZSM-5 produced a relatively better performance, with the removal efficiency of around 96.6% Hg0and the adsorption capacity of around 901.63 ug/mg Hg0achieved at 120 °C. The interaction between CoOxand FeOximproved the reducibility of oxygen species, thus promoting the oxidation of Hg0. Among a variety of other gas components, O2and NO exerted a positive effect on Hg0, which improved its removal to a certain extent. By contrast, SO2caused an adverse effect on the capture of Hg0, which could be reversed to some degree by the introduction of 5% O2. After five cycles, the mercury removal efficiency of Co4Fe1-ZSM-5 remained above 90%, suggesting excellent recyclability. Finally, XPS analysis was conducted to reveal that Mars–Maessen mechanisms are dominant in the process of mercury adsorption.Keywords:Hg0adsorption;ZSM-5;cobalt oxide;iron oxide;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
ADVANCED FUNCTIONAL MATERIALS
·
2025
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IF 19
Chengyue Yang,Yuanbo Sun,Bin Zhao,Ji Han,Benzheng Li,Peilin Xue,Lei Xie,Jianshe Hu,Jingyi Wang
Rapid and targeted intervention during sudden mercury pollution incidents can significantly mitigate the harmful effects of mercury dissemination. Mesoporous metal–organic frameworks (MOFs) are demonstrated great promise for mercury wastewater purification, owing to their exceptional adsorption capacity. However, these materials often underperform at exceptionally high or low Hg(II) concentrations, limiting their use in emergencies. To address this issue, this study leverages nanostructure engineering techniques and, for the first time, fine-tunes the proportion of surfactants to construct a thiol-functionalized UiO-66 MOF (Nic-UiO-66-SH) with size-adjustable nano-ion channels for rapid Hg(II) pollution management in emergency contexts. The Nic-UiO-66-SH, with a maximum adsorption capacity of 1695.87 mg g −1 , can quickly and effectively adsorb Hg(II) at extreme concentrations (10–600 mg L −1 ) within 2.5–105 min, bringing the concentration down to drinking water standards (<0.002 mg L −1 ). This superior performance is attributed to the concentration-specific adsorption mechanism of ions in adaptive nano-ion channels based on Debye radius theory, which guides the precise control of channel size. Molecular simulations further validate the significant role of ion channels in optimizing Hg(II) diffusion and adsorption. This work establishes a theoretical foundation for the development of emergency wastewater purification materials and promotes their practical application in pollution response scenarios.
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
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Penggang Pei,Tao Sun,Yingming Xu,Yuebing Sun
Mercury (Hg) contamination in water and soil is of great concern due to its high toxicity and biomagnification in food chain. In this study, clay mineral montmorillonites (Mt) was thiol-functionalized via 2–mercaptoethylammonium intercalation (ISH–Mt) and 3–mercaptopropyltrimethoxysilane surface grafting (GSH–Mt) for enhancing remediation ability of Hg contamination. Characterization results indicated that surface grafting significantly changed surface morphology and porous structure , with rougher surface, larger specific surface area and more porous structure. The adsorption capacity of Hg 2+ was significantly enhanced by thiol functionalization, being 141.55 and 136.92 mg g −1 for ISH–Mt and GSH–Mt, respectively. Fitting results of pseudo-second-order kinetic models ( R 2 = 0.879– 0.930) and Freundlich isotherms ( R 2 = 0.900– 0.950) indicated that Hg 2+ was adsorbed on heterogeneous surfaces with chemical processes as the rate-limiting step. TCLP-Hg concentrations in soils after applying ISH–Mt and GSH–Mt (0.1%–1% dosage, m/m ) were < 200 μg L −1 (The Leaching Standards of Hazardous Wastes , USEPA). Hg fractionation shifted from mobile fractions (exchangeable and carbonate-bound) to stable forms (organic matter-bound). XPS and Hg L III -edge EXAFS studies revealed that the complexation of –SH toward Hg was the primary mechanism for Hg adsorption and stabilization. These results illustrated that thiol-functionalized Mts prepared by intercalation and surface grafting are promising for the remediation of Hg-contaminated water and soil.
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
高影响因子
危险品化学品经营许可证（带存储）