JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2018
·Vol. 93
·期 9
·2691-2700
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IF 2.587
Zhuqing Wang,Pengxiang Jin,Min Wang,Genhua Wu,Jiayin Sun,Yujie Zhang,Chen Dong,Aiguo Wu
BACKGROUND In this study, a low-cost and environment-friendly alginate–chitosan hybrid adsorbent (depicted as Alg-Chi) was developed for the removal of Pb 2+ from water. RESULTS Experimental results showed that the Alg-Chi exhibits high selectivity and affinity for Pb 2+ . The selectivity coefficients of the Alg-Chi for Pb 2+ /Cr 3+ , Pb 2+ /Co 2+ Pb 2+ /Cd 2+ , Pb 2+ /Zn 2+ , and Pb 2+ /Cu 2+ are all >5. It can uptake 96.8% of Pb 2+ from Pb 2+ -containing solutions (1.5 mmol L −1 ), and the maximum adsorption capacity for Pb 2+ reaches 468.5 mg g −1 , which is higher than that of most reported adsorbents for Pb 2+ . Moreover, the Alg-Chi can also be regenerated via simple acid elution and used repeatedly without loss in adsorption ability. CONCLUSIONS Analysis of the adsorption mechanism indicated that the Alg-Chi adsorbed Pb 2+ mainly through ion exchange and chemical coordination. Green and low-cost raw materials, simple preparation process, efficient removal efficiency and recyclable, these characteristics give the synthetic Alg-Chi broad application prospects in the field of Pb 2+ -containing wastewater treatment. © 2018 Society of Chemical Industry
研究领域:
环境科学
·
材料科学
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高影响因子
CELLULOSE
·
2013
·Vol. 20
·期 2
·849-860
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IF 3.476
Duan Chunting,Zhao Ning,Yu Xiaolan,Zhang Xiaoyan,Xu Jian
Kapok fiber, a natural hollow fiber with thin shell and large cavity, has rarely been used as adsorbent for heavy metal ions. In this paper, kapok fibers were modified with diethylenetriamine pentaacetic acid (DTPA) after hydrophilicity treatment. The adsorption behavior of the resultant kapok-DTPA influenced by pH, adsorption time and initial concentration of metal ion was investigated. The results demonstrate that adsorption equilibrium was reached within 2 min for Pb 2+ and Cd 2+ . Adsorption kinetics showed that the adsorption rate was well fitted by pseudo-second-order rate model. The adsorption isotherms were studied, and the best fit was obtained in the Langmuir model. The maximum adsorption capacities of kapok-DTPA were 310.6 mg g −1 for Pb 2+ , 163.7 mg g −1 for Cd 2+ , 101.0 mg g −1 for Cu 2+ , respectively. After eight desorption and re-adsorption loops, the lost adsorption capacities for Pb 2+ and Cu 2+ were less than 10 %. Because of the large specific area derived from the hollow fiber structure, kapok-DTPA exhibited much better adsorption capacity compared with many other reported adsorbents based on natural materials.
研究领域:
环境科学
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材料科学
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FOOD CHEMISTRY
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2020
·
IF 6.306
Lijuan Huang,Liyun Wang,Zhiyong Nie,Yongan Wang
Rapid and precise detection of Tl + and Pb 2+ is important to prevent water poisoning and environmental pollution. Gold nanoparticles (AuNPs) have gained focus for heavy metal ion detection but cannot yet achieve accurate quantitative analyses when Tl + and Pb 2+ coexist. We propose a sensitive, flexible, and low-cost method for the qualitative and quantitative analysis of binary Tl + /Pb 2+ mixtures based on AuNP sensors. Partial least squares, back interval partial least squares and data fusion applied to analyze UV–Vis spectral data according to the AuNPs aggregation behavior, revealed discrete responses to the target analytes. The limits of detection for Tl + and Pb 2+ in the binary mixture were 5.23 and 1.76 nM, respectively, and good linear dependence was obtained. The method was successfully applied to the detection of both ions in tap and mineral water. This method can reveal water poisoning and environmental pollution events to ensure drinking water safety.
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高影响因子
TALANTA
·
2020
·
IF 5.339
Mao-Rong Xie,Yu Cai,Yu-Qi Liu,Zhi-Yong Wu
Pb 2+ is one of the major environmental pollutants , which can be visually detected by surface plasmon resonance of nanoparticles . Paper based analytical device, as a newly developed microfluidic detection platform, is featured in cost-effective and suitable for on-site analysis. In this paper, a sensitive and portable detection method for Pb 2+ was proposed, in which Pb 2+ was electrokinetically stacked on the paper fluidic channel by geometric field amplification effect and visualized online by glutathione-modified silver nanoparticles . Colorimetric quantification of the visualized stacking band was conducted by smart phone camera. To avoid unfavorable influence from pH change on the surface plasmon resonance visualization, field amplification effect was introduced by geometric design of the paper fluidic channel. The enriched Pb 2+ was clearly visible on the paper substrate, and the stacking band intensity was about four orders of magnitude enhanced, comparing to the intensity without stacking. A linear response to Pb 2+ was observed in the range of 0.3–7.0 μM (R 2 = 0.997) with a limit of detection of 86 nM and a limit of quantity of 0.28 μM. The established method was used in the detection of Pb 2+ from river and lake water samples, and the results were confirmed by atomic absorption spectroscopy method.
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高影响因子
MACROMOLECULAR RESEARCH
·
2019
·Vol. 28
·期 1
·51-56
·
IF 1.758
Zhang Siyu,Shi Baoli,Yang Guang
Due to the high toxicity for brain and the nervous system of humans and other living organisms, the design and fabrication of a robust and sensitive method for the detection of Pb 2+ in the aqueous solution has attracted the increasing attention among scientists. Herein, a colorimetric and fluorometric sensor for the detection of Pb 2+ in the aqueous solution by incorporating a new phenylboronic acid functionalized polydiacetylene liposome was designed. The molar ratio of 4:1 between the monomers, 10,12-pentacosadiynoic acid (PCDA) and phenylboronic acid functionalized PCDA (PCDA-pBA) not only offered sufficient binding sites for Pb 2+ , but also interrupted the efficient π -conjugation backbone of polydiacetylene (PDA) chains associated with the color and fluorescence changes. Compared with other metal ions, only Pb 2+ could cause the color change and the fluorescence enhancement. Moreover, the hybrid PDA liposomes exhibited high sensitivity, fast response time (10 s), and a reasonable detection limit for Pb 2+ (0.1 µM). This work not only provides a versatile methodology for the fabrication of sensors for Pb 2+ detection, but also is of great fundamental value for a deeper understanding of the complexion-induced color changes based on polydiacetylene materials, and may pave the way for fabrication a new method for recognizing other metal ions.
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高影响因子
POLYMER ENGINEERING AND SCIENCE
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2023
·
IF 3.2
Jingyu Du,Junzhuo Sun,Daohai Zhang
As one of the most common pollutants in wastewater, heavy metals seriously threaten human health and survival, and among the current removal methods, the adsorption method has attracted the most attention because of its simple and safe operation. Zeolite is a substance with a unique spatial structure, cheap cost, and environmental friendliness. Zeolite is a substance with a unique spatial structure, cheap cost, and environmental friendliness. Due to its size and high surface area-to-volume ratio, zeolite exhibits excellent adsorption and ion exchange properties and is a promising adsorbent. In this paper, the modified zeolite chitosan composite film was prepared by solution method by dissolving chitosan in acetic acid solution as the solvent, and the effects of zeolite content, modifier type, initial pH, pore-making agent, adsorption time, adsorption temperature, initial concentration, and feeding amount were studied. The optimal conditions for Pb 2+ adsorption were 40% modified zeolite content, 293 K in 100 mg/L solution, a feeding amount of 1 g/L, pH = 5.5, and a removal rate of 96.6% in 24 h. The isotherm is consistent with the Langmuir adsorption model, which is manifested as single-molecule chemical adsorption, and the highest saturated adsorption capacity is 139.6 mg/g. After five cycles, it still has a greater than 90% initial adsorption effect. Highlights Chitosan-modified zeolite composite membranes are inexpensive. After adsorption, the sorbent is easy to recover.
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JOURNAL OF MOLECULAR STRUCTURE
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2023
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IF 3.8
Yingnan Wang,Zhen Huang,Linlin Sheng,An Wang,Zhanbin Huang
Humic acid residue (HAS), as a waste product from the extraction of humic acid from low-rank coal such as weathered coal and lignite, is characterized by its abundant yield and low price. However, the low efficiency and high pH value of HAS in passivating heavy metals limit their application in the passivation of heavy metals in soils. To improve the passivation efficiency of humic acid residues against heavy metals, in this study, modified humic acid residues (N-HAS) were prepared by pretreatment with HNO 3 and modification with NH 4 H 2 PO 4 . The results showed that the passivation efficiency of N-HAS was up to 87.75% and 57.07% for Hg and Pb in the effective state, and the adsorption kinetics were under the pseudo-second-order model. The addition of N-HAS to the soil resulted in a change in the morphology of the heavy metals, with the acid extractable state of Hg and Pb reduced by 66.92% and 30.44% respectively, and the results of the Toxicity Leaching Test (TCLP) showed that the addition of N-HAS significantly reduced the leaching toxicity and potential ecological risk index (RI). The soil physicochemical properties changed after the addition of N-HAS and there was a correlation between the soil physicochemical properties and the effective state of Hg and Pb content. In conclusion, N-HAS has a positive effect on the remediation of heavy metal-contaminated soil and has a broad application prospect.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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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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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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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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高影响因子
Journal of Physical Chemistry C
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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
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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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高影响因子
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