SCIENCE OF THE TOTAL ENVIRONMENT
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2022
·
IF 10.753
Suzhen Huang,Zhikai Wang,Qixuan Song,Jun Hong,Tianyu Jin,Haiqing Huang,Zheng Zheng
Humic substances are widely present in aquatic environments. Due to the high affinity of humic substances for metals, the interactions have been particularly studied. To assess the effect of humic acid (HA) on submerged macrophytes and biofilms exposed to heavy metal stress, Vallisneria natans was exposed to solutions containing different concentrations of HA (0.5–2.0 mg·L −1 ), Pb 2+ (1 mg·L −1 ) and Cd 2+ (1 mg·L −1 ). Results suggested that HA positively affected the plant growth and alleviated toxicity by complexing with metals. HA increased the accumulation of metals in plant tissues and effectively induced antioxidant responses and protein synthesis. It was also noted that the exposure of HA and metals promoted the abundance and altered the structure of microbial communities in biofilms. Moreover, the positive effects of HA were considered to be related to the expression of related genes resulting from altered DNA methylation levels, which were mainly reflected in the altered type of demethylation. These results demonstrate that HA has a protective effect against heavy metal stress in Vallisneria natans by inducing effective defense mechanisms, altering biofilms and DNA methylation patterns in aquatic ecosystems.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Xiang Wang,Jiwei Wang,Landong Jiang,Yibo Jiang
The heavy metal ions contained in industrial wastewater are a great threat to human health. Exploring a adsorbent which have low-cost, green environmental friendly, high adsorption capacity, good recycle is key to solve heavy metal ions pollution. Lignin sulfonate was obtained by treating corn stover, and then modified lignin sulfonate was obtained by hydrothermal method . The porous structure makes heavy metal ions occupy more internal adsorption sites. Modified lignosulfonate adsorbent efficiency removes heavy metals in wastewater especially Cu 2+ and Pb 2+ . The adsorption capacity of Cu 2+ on modified lignosulfonate is 450.3 mg g −1 , Pb 2+ is 475.4 mg g −1 . In addition, for 40 mg L −1 Cu 2+ and Pb 2+ using 0.4 g L −1 , the adsorption equilibrium is only reached within 60 min. Meanwhile, the removal ratio of Pb is 83 %, Cd is 72 %, Cu is 87 %, Zn is 36 %, Mn is 25 %, Cr is 95 %, and Fe is 99 % in wastewater using 0.4 g L −1 adsorbent in 2 h. This research develops a practical adsorbent to remove heavy metals from actual wastewater.
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Journal of Physical Chemistry C
·
2023
·
IF 3.7
Xuankun Wei,Yongqi Sun,Yiping Su,Xuehua Shen,Yuanyuan Tang,Feng Yan,Zuotai Zhang
Geopolymers have emerged as a promising solution for solidifying heavy metals; however, the underlying mechanisms remain elusive. In this study, we synthesized geopolymers incorporating Pb2+ and Cd2+ to unravel their solidification mechanisms. Leaching analyses demonstrated superior solidification efficacy for Pb2+ (93.6%) compared to that for Cd2+ (65.2%). The dissimilarity in solidification mechanisms can be attributed to variances in ionic potential and covalent interactions between the cations. Furthermore, Cd2+ exhibited a higher ionic potential, facilitating its exchange with Na+ in the geopolymer matrix. Triple-quantum nuclear magnetic resonance experiments revealed a weak affinity of the geopolymer structure toward Cd2+. Density functional theory calculations affirmed stronger interactions between Pb2+ (−8.71 eV) and the matrix compared to those of Cd2+ (−5.83 eV). Consequently, Pb2+ demonstrated an enhanced covalent propensity within the geopolymer matrix, while Cd2+ primarily underwent solidification via ion exchange. This research provides novel insights and concepts regarding the mechanisms involved in solidifying heavy metals in geopolymers.
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JOURNAL OF HAZARDOUS MATERIALS
·
2022
·
IF 14.224
Xiao-Yu Tian,Meng-Wei Sun,Guo-Yu Wen,Min Cao,Da-Wei Pan,Rui Xie,Xiao-Jie Ju,Zhuang Liu,Wei Wang,Liang-Yin Chu
Ultrasensitive real-time detection of trace Pb 2+ in continuous flow is vital to effectively and timely eliminate the potential hazards to ecosystem health and sustainability. This work reports on a micro-structured smart hydrogel grating with ultra-sensitivity, high selectivity , good transparency and mechanical property for real-time detection of Pb 2+ in continuous flow. The hydrogel grating possesses uniform surface relief microstructures with periodic nano-height ridges made of poly(acrylamide- co -benzo-18-crown-6-acrylamide) networks that crosslinked by tetra-arm star poly(ethylene glycol)acrylamide. The hydrogel grating with good optical transparency and mechanical property can change its height via selective host-guest complexation with Pb 2+ to output a changed diffraction efficiency. Meanwhile, the periodic nano-ridges with large specific area benefit the contact with Pb 2+ for fast Pb 2+ -induced height change. Thus, with such rationally designed molecular structures and surface relief microstructures, the hydrogel grating integrated in a glass-based mini-chip allows real-time detection of Pb 2+ in continuous flow with ultra-sensitivity and high selectivity. The hydrogel grating detector can achieve ultralow detection limit (10 −9 M Pb 2+ ), fast response (2 min), and selective detection of Pb 2+ from dozens of interfering ions even with high concentrations. This high-performance hydrogel grating detector is general and can be extended to detect many analytes due to the wide choice of responsive hydrogels, thus opening new areas for creating advanced smart detectors in analytical science.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2022
·
IF 8.025
Ya Li,Xi-xiang Shuai,Ming Zhang,Fei-yue Ma,Jun Chen,Jian Qiao,Rong-hao Chen,Li-qing Du
As a common macromolecular carbohydrate, pectin has a strong affinity for Pb 2+ . An ethylenediamine modified pectin (EP 48 ) with 48 % of amidation was prepared and exhibited great removal efficiency towards Pb 2+ in our previous study. However, the EP 48 has drawbacks in adsorption including low mechanical strength and difficulty in separation. In this study, EP 48 was compounded with sodium alginate (Alg) and Fe 3 O 4 to synthesize EP 48 /Alg/Fe 3 O 4 microsphere. The physicochemical properties and Pb 2+ adsorption characteristics of microsphere were analyzed. It was found that the microsphere exhibited good thermal stability, mechanical strength, porous structure, as well as acid tolerance. The pseudo-second-order model well described the kinetics of adsorption process, indicating the chemical adsorption is dominant. The Langmuir model fitted the experimental data well, and the maximum adsorption capacity reached 175.19 mg/g. Adsorption-desorption experiments showed that the removal rate of the microsphere maintained over 98.9 % after 10 cycles. The X-ray photoelectron spectroscopy (XPS) analyses revealed that the potential adsorption mechanism included ion-exchange and chelation. The above results suggested its potential use for the removal of Pb 2+ from wastewater.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Qiushi Jiang,Chaoyue Zhao,Zhaolian Han,Guixia Yang,Nan Qu,Lianzhi Sun,Weiping Li,Mingyu Wang,Zhiqiang Cheng
The synthesis of three amino-functionalized polyacrylonitrile/bentonite (PAN/BT) composite membranes and the removal strategies of Pb 2+ and Congo Red (CR) from water were put forward. The successful synthesis of PAN/BT was confirmed by scanning electron microscopy, X-ray energy spectrum, differential thermogravimetric analysis, specific surface area and contact angle tests. In addition, although having a similar composition to PAN/BT, the functionalized membrane materials have more N-H and C = N groups and stronger wettability. The influences of the optimal contaminant type, adsorbent dosage, temperature, contaminant concentration and contact time on the adsorption process of the modified membrane materials were systematically investigated. The adsorption processes were in good agreement with the Langmuir model, in which the theoretical maximum adsorption capacities of γ-aminopropyl triethoxysilane (KH550)-modified PAN/BT (K-PAN/BT), diethylenetriamine (DETA)-modified PAN/BT (D-PAN/BT) and hydroxylamine hydrochloride (NH 3 OHCl)-modified PAN/BT (N-PAN/BT) for Pb 2+ were 200.1, 332.9 and 182.8 mg/g, and the theoretical maximum adsorption of CR was 346.9, 156.2 and 579.2 mg/g, respectively, which were higher than 88 and 149 mg/g of bentonite, exhibiting excellent component synergy. The adsorption equilibrium was reached within 100 min for both Pb 2+ and CR, and the adsorption processes were in accordance with the pseudo-second-order kinetics, involving chelation, cation exchange and ‘π-π’ interactions. It is worth mentioning that the N-PAN/BT membranes can remove high concentrations of anionic and cationic dyes with a difference of up to 100 times, with selective adsorption potential and excellent contaminant indicating ability, which has an application prospect in the field of environmental protection.
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Foods
·
2021
·Vol. 10
·期 12
·3127
·
IF 4.35
Risi Wang,Ya Li,Xixiang Shuai,Jun Chen,Ruihong Liang,Chengmei Liu
Traditional aerogels lack specific functional groups for the adsorption of Pb2+, which results in a low adsorption capacity and limits the application scope. Novel porous pectin-based aerogels (PPEAs) were prepared by incorporating polyethylenimine (PEI) using ethylene glycol diglycidyl ether (EGDE) as a cross-linker for the removal of Pb2+from water. The cross-linking mechanism, morphology, mechanical strength, thermal stability, adsorption properties, and mechanism of the aerogels were investigated. The aerogels possessed several desirable features, such as a large maximum Pb2+adsorption capacity (373.7 mg/g, tested at pH 5.0), ultralight (as low as 63.4 mg/cm3), high mechanical strength (stress above 0.24 MPa at 50% strain), and easy recyclability. Meanwhile, the equilibrium adsorption data was well described by the Langmuir–Freundlich (Sips) model and the kinetic adsorption process was well fitted using the pseudo-second-order model. The donor groups, such as -NH2, and oxygen-containing functional groups were responsible for the Pb2+adsorption, which was confirmed by the FTIR and XPS analysis. The excellent characteristics mean that PPEAs are highly effective adsorbents in the remediation of lead-containing wastewater.Keywords:pectin;PEI;EGDE;aerogel;Pb2+;adsorption
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INDUSTRIAL CROPS AND PRODUCTS
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2021
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IF 5.645
Yu Peng,Hui Huang,Yilan Wu,Shuanghui Jia,Fang Wang,Jun Ma,Yang Liao,Hui Mao
Bayberry tannin (BT), a typical plant tannin, was grafted onto chitosan microfibers (CF) through the Mannich reaction to synthesize biosorbent (BT-CF) that was effective for adsorptive removal of Pb 2+ from aqueous solutions. The adsorption capacity of Pb 2+ on the BT-CF was pH-dependent, which increased from 4.5 mg/g to 21.7 mg/g along with increasing solution pH from 2.5−5.5. The adsorption capacity increased with the increase of temperature from 303 K to 323 K, and thermodynamic calculations indicated that the adsorption of Pb 2+ on the BT-CF was an endothermic process. The adsorption isotherms were well described by the Langmuir isotherm model with correlating constant (R 2 ) higher than 0.980. The adsorption kinetics were well described by the pseudo-second-order rate model. The Pb 2+ adsorbed on the BT-CF was desorbed using diluted acid solution. Column adsorption experimental results confirmed that the BT-CF was applicable for continues adsorptive removal of Pb 2+ at the low concentration of 2.0 mg/L.
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Science China-Chemistry
·
2019
·Vol. 63
·期 3
·404-410
·
IF 6.085
Lu Shasha,Wang Shuang,Zhao Jiahui,Sun Jian,Yang Xiurong
RNA-cleaving DNAzymes possess important roles in DNAzymes and have been widely used in the biosensors, DNA nanomachines owing to their ion-specific dependence. However, there are still challenges in constructing universal but versatile stimuli-responsive strategies of RNA-cleaving DNAzymes. Herein, a stimuli-responsive strategy for RNA-cleaving DNAzyme is proposed by the artful design of hairpin nanostructure, in which the activities of DNAzyme (Pb 2+ -dependent DNAzyme as a model) in the hairpin’s loop are pH-regulated by using the triplex stem as the “lock”. Upon introducing the “key”, pH values, the DNAzyme will be activated and fragment the substrate of it in the presence of Pb 2+ , accompanied by the turn-on of the fluorescence quenched by fluorescence resonance energy transfer (FRET). The regulation ability of pH can be controlled by the length and sequence of the triplex stem, and the wide pH regulation range may be helpful for the application of DNAzymes in biological medicine delivery systems.
研究领域:
生物化学
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纳米技术
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生物传感器
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分子生物学
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JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Dianji Ding,Jiao Fei,Yong Yao,Yanji Jiang,Huimin Sun,Xianqiang Yin
Quantum dots (QDs), emerging semiconductor nanomaterials, have been detected in various environmental media and can adsorb co-existing contaminants (e.g., Pb 2+ ). Surface modifications aimed at enhancing the performance of QDs can significantly affect their physicochemical properties, but their effects on QDs environmental behavior remain unclear. Herein, we investigated the adsorption and co-transport behaviors of aminated (NQD), hydroxylated (OQD), and carboxylated cadmium sulfide QDs (CQD) with Pb 2+ via batch adsorption and quartz sand column experiments. The influence of ionic strength (IS) and cation valence on the co-transport of QDs and Pb 2+ was examined. Our experimental findings revealed that Pb 2+ inhibited the mobility of OQD and CQD but enhanced the transport of NQD due to the surface complexation and cation bridging effects. This promoting effect was weakened with increasing IS and cation valence, indicating the involvement of non-Derjaguin-Landau-Verwey-Overbeek forces. Furthermore, OQD and CQD with high mobility and strong affinity to Pb 2+ effectively promoted the transport of Pb 2+ , with CQD exhibiting a more pronounced effect than OQD. Conversely, NQD reduced Pb 2+ efflux due to their lower mobility and stronger adsorption to Pb 2+ . These results provide valuable insights into the role of surface modifications on QDs and their interactions with co-existing contaminants in subsurface environments.
研究领域:
环境科学
·
纳米技术
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NANOTECHNOLOGY
·
2022
·Vol. 34
·期 10
·105708
·
IF 3.953
Qingming Xu,Jie Lv,Tongfei Wu,Bo Hu,Yunhui Li,Fanming Zeng,Jianwei Zhu
In this work, an environment-friendly core–shell material based on CDs@SiO2 as the core and mesoporous ion-imprinted layer as the shell was reported. As a highly sensitive and accurate fluorescent sensor for the detection of Pb2+ in environmental water, the composition combined ion imprinting technology with quantum dots to selectively quench the fluorescence of CDs by metal coordination in the presence of Pb2+, and the visual change of gradually weakening blue color could be observed by the naked eye for visual detection. The mesoporous structure significantly improved the detection recognition rate of CDs@SiO2@MIIPs.The molecularly imprinted sensor presented a favorable linear relationship over a Pb2+ concentration range from 10 nmol l−1 to 100 nmol l−1 and a detection limit of 2.16 nmol l−1 for Pb2+. The imprinting factor of the CDs@SiO2@MIIPs was 5.13. The sensor has a fast detection rate, is highly selective in the identification of Pb2+, and can be reused up to 10 times. The applicability of the method was evaluated by the determination of Pb2+ in spiked environmental water samples with satisfactory results.
研究领域:
环境科学
·
分析化学
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Heliyon
·
2022
·
IF 3.776
Suwei Jiang,Hailiang Hu
In this paper, we explore the adsorption potential of catechin (CT) loaded composite microspheres and provide a new micron scale carrier of functional factor. Chitosan (CS) modified rice porous starch (RPS/CS) was used as a CT adsorption carrier to prepare bioactive CT-loaded composite microspheres (CT@RPS/CS). The adsorption kinetics, storage characteristics, and biological activity maintenance of CT@RPS/CS were studied in an aqueous solution, and the sustained-release characteristics of CT@RPS/CS were studied in vitro during simulated gastrointestinal digestion. An aqueous solution further studied the removal characteristics of adsorbed heavy metal ion Pb 2+ . RPS/CS can significantly improve the ability to adsorb CT. RPS/CS can also significantly improve CT's storage stability, antioxidant stress, and slow-release characteristics, and the sustained release effect in gastric and intestinal juice. CT@RPS/CS can be removed Pb 2+ by adsorbing in the solution, and their adsorption was physical adsorption and chemisorption, but the primary interaction is chemisorption. CT@RPS/CS can be used as a micron carrier of new food functional factors, which has potential space for improving and expanding the functional characteristics of its loaded functional factors and the endowing of new functions.
研究领域:
食品科学
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生物化学
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环境科学
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