CHEMOSPHERE
·
2021
·
IF 7.086
Siyu Jiang,Lili Yan,Runkai Wang,Guanghui Li,Pinhua Rao,Mengcan Ju,Ling Jian,Xin Guo,Lei Che
Facile and low-cost preparation are essential in the conversation of agricultural waste into biochar. In this work, nitrogen-doped biochar (NBC-350-0.1) was prepared by thermal decomposition of urea (urea/biochar = 0.1:1 mass ratio) at a low temperature of 350 °C. NBC-350-0.1 showed good performance for Pb(II) removal with the maximum adsorption capacity of 130.87 mg g −1 at 25 °C, which was five times that of pristine biochar (BC). Adsorption kinetics, isotherms and thermodynamics studies indicated that the adsorption of Pb(II) by NBC-350-0.1 or BC was the homogeneous monolayer adsorption with chemical action as the rate-limiting step, and was accompanied by spontaneous endothermic. Further analysis showed that the removal of Pb(II) on NBC-350-0.1 and BC depended on the complexation with unsaturated carbon bonds and ion exchange with Ca(II). Moreover, graphitic- and pyridinic-N in NBC-350-0.1 exerted a key part in the adsorption of Pb(II). NBC-350-0.1 regenerated by NaOH exhibited excellent recycling performance keeping the original removal efficiency at 84% after five cycles. In addition, this N doping method is suitable for improving the performance of coffee grounds, sawdust, and bagasse biochar. These results would provide an idea for obtaining recyclable N-doped biochar to treat the Pb(II) polluted wastewater.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2022
·
IF 3.656
Qiuping Fu,Jie Lou,Hui Yuan,Rongbin Zhang,Chunmei Zhang,Changli Mo,Jun Luo,Lei Zha,Pan Wu
ZIF-67@CS composites were prepared by in-situ growth method. The phase and structure of ZIF-67@CS composite were characterized by X-ray powder diffraction (XRD) and fourier transform infrared spectroscopy (FT-IR). The morphology of the materials was characterized by field emission scanning electron microscope (SEM). X-ray photoelectron spectroscopy (XPS) measurements demonstrated the existence of Pb(II) after the adsorption process of composite materials. The adsorption of Pb(II) by composite material conforms to Langmuir model, the theoretical maximum adsorption capacity is 505.051 mg/g. The pseudo-second-order kinetic model can well describe the adsorption kinetic process.
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
RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 44
·期 5
·2983-2998
·
IF 1.674
He Changhua,Zhou Qigang,Duan Zhengyang,Xu Xiaojun,Wang Fuhai,Li Hui
A new multifunctional β-cyclodextrin-sodium xanthogenate (β-CDX) was successfully synthesized by a one-step process and applied to remove Pb(II) from aqueous solutions. The characteristics and chelation mechanisms of β-CDX were investigated by Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy, and the influences of various operating parameters such as pH (lime dosage), the order of the additions, β-CDX dosage, and the initial concentration of Pb(II) on the removal capacity of β-CDX and the characteristics of the products were systematically evaluated. The results demonstrated that the optimal removal effect for Pb(II) was achieved when β-CDX was used rather than using lime alone. In addition, it was more effective to add β-CDX to the working solutions prior to adding the lime than adding β-CDX after the lime. The use of 0.05 g/L of β-CDX was effective for the removal of Pb(II) according to the residual concentration when the initial concentration was 100 mg/L at different pH values. The maximum removal rate of the Pb(II) ions was 98% for all initial concentrations and the products were larger (size = 137.9 μm) and looser ( D f = 1.73) at an optimum pH range from 9 to 12. The characterization results confirmed that the RC(S)SNa in the β-CDX was the main contributor to the chelation of the Pb(II). These properties of β-CDX make it a promising compound for the treatment of wastewater contaminated by hazardous metal ions.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Xin Wen,Zhanfang Cao,Jing Wang,Shuai Wang,Hong Zhong
A novel tri-isopropanolamine functionalized graphene oxide (TI-GO) adsorbent was synthesized by one-step reaction at 358K. Then the prepared TI-GO was characterized by SEM-EDS, FTIR, Raman spectra, TG, BET and XPS. The characterization results indicated the TI-GO has been synthesized successfully and it interact with Pb(II) ions through its nitrogen and oxygen-containing functional groups. Batch adsorption experiments were applied to evaluate the optimized conditions of adsorption. The results indicated that the TI-GO can reach equilibrium adsorption in 30 min and get maximum adsorption capacity at 293 K, pH 5.0. Besides, the adsorption kinetic and adsorption isotherm research indicated that the adsorption of TI-GO fit pseudo-second-order (PSO) kinetic and Langmuir adsorption isotherm model. In addition, the maximum adsorption capacity evaluated by Langmuir adsorption isotherm equation is 1478 mg/g.
研究领域:
环境科学
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材料科学
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化学工程
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环境污染治理
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吸附材料
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Shuai Wang,Hao Wang,Shixing Wang,Likang Fu,Libo Zhang
The removal of lead(II) from wastewater is conducive to reduce the risk of harmful metals to the environment and people. A magnetic organic framework adsorbent (Ni 0.6 Fe 2.4 O 4 -HT-COF) with high selectivity, repeatability and facile solid–liquid separation was devised through the condensation process of hexachlorocyclo-triphosphazene, trithiocyanuric acid and Ni 0.6 Fe 2.4 O 4 . At 298 K and pH = 5.0, the adsorbent showed remarkable Pb(II) adsorption capability. The removal rate reached 95.64 % at 10 min and the maximum adsorption capacity was 411.80 mg/g. The partition coefficient ( K Q ) of Pb(II) among the seven coexisting ions was 34079 mL/g and the adsorption efficiency was 97.15 %, indicating that the adsorbent can accurately capture Pb(II) from wastewater containing multiple ions. The PSO kinetic and the Langmuir isotherm models agreed with Pb(II) adsorption on Ni 0.6 Fe 2.4 O 4 -HT-COF, demonstrating that Pb(II) was removed by monolayer chemisorption. The adsorption was a spontaneous exothermic process using thermodynamic analysis. In addition, the adsorbent was able to maintain 91.77 % adsorption efficiency for Pb(II) after four adsorption–desorption cycles. Zeta potential and XPS analysis revealed that Ni 0.6 Fe 2.4 O 4 -HT-COF removed Pb(II) by electrostatic attraction and chelation. Density functional theory (DFT) was utilized to simulate the adsorption process, and the effects of different types of atoms on adsorption were discussed. The results demonstrate that the chelation and electrostatic interaction between Ni 0.6 Fe 2.4 O 4 -HT-COF and lead(II) ions were involved in the selective adsorption. The novel magnetic COF has a lot of potential for removing heavy metal Pb(II).
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Youyu Cao,Mengshuo Du,Fei Han,Xueli Luo,Weixia Yang,Wanmei Lin,Yingying Wang,Wenzhi Tang,Zhonghong Li
Pb(II) removal from water is essential for human health due to their high toxicity and carcinogenicity. Metal-organic frameworks (MOFs) have potential to remove heavy metal ions because of their adjustable structure and tunable pore size. However, the microporous structure limits their removal performance because Pb(II) mainly exists in water as hydrated ion, which is larger than the pore size of MOFs. Defect engineering is promising to form suitable pore to capture Pb(II). Herein, we developed an etched Cu 0.3 Zr 0.7 -MOF-808 MOF by a mixed-metal strategy followed with an etching process. We replaced part of Zr 4+ in the MOF-808 skeleton with Cu 2+ through competition between Zr 4+ /Cu 2+ for coordinating with –COOH on 1,3,5-Benzenetricarboxylic acid (H 3 BTC) to increase its specific surface area. Then H 3 PO 4 and EDTANa 2 ·2H 2 O as etchants were used to break the coordinate bond between Zr 4+ /Cu 2+ and –COOH on H 3 BTC to achieve macroporous structure to inhabit Pb(II). The powder property of MOFs limits their practical applications due to their poor recyclability. We crosslinked the MOF on CMC by coordinating Zr 4+ on the MOF with –COOH on CMC to form aerogel to facilitate its recyclability. The maximum adsorption capacity for Pb(II) was 542.77 mg/g at 45 °C. The adsorption of Pb(II) conformed to the intra-particle diffusion model and the Langmuir model, illustrating that the adsorption process was monolayer adsorption and affected by intra-particle diffusion. The electrostatic attraction and chelation between Pb(II) and –COOH accounted for the effective Pb(II) removal performance. This work provides a novel idea for the removal of heavy metal ions from water.
研究领域:
环境科学
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材料科学
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化学工程
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
Sustainable Chemistry and Pharmacy
·
2025
·
IF 5.8
Zhirong Chen,Jinfeng Tang,Nana Wang,Mingdong Chang
Utilizing plant wastes to treat Pb(II)-polluted water bodies offers a sustainable solution, but concerns over adsorption ability and separation efficiency limit its application. This study investigates the preparation and application of three-dimensional macroporous network-structured modified wood flour (WTX and TZX) for efficient Pb(II) removal. The adsorbents were synthesized through xanthate modification of defatted (TZ) and non-defatted (WT) wood flour, followed by lyophilization to achieve a stable porous structure. The optimal preparation condition involved mixing 1.0 g of original wood flour with 2 mL of CS 2 in a strong base environment at 25 °C for 3 h. Both WTX and TZX exhibited similar three-dimensional structure and good solid-liquid separation performance. Pb(II) removal rates reached 61 % for WTX and 54 % for TZX within 45 min. The maximum adsorption capacities were 221.73 mg/L for WTX and 210.53 mg/g for TZX, significantly higher than untreated wood flour. Despite similar appearances and maximum Pb(II) removal abilities, the defatting pretreatment did not enhance mechanical properties or adsorption performance. Pb(II) immobilization occurred via electrostatic attraction, complexation and precipitation, with functional groups like –O–C (=S)–SNa, –OH, –NH 2 and –COOH playing key roles. An economic assessment highlighted the cost-effectiveness of the adsorbents, with an estimated treatment cost of 3.21 US$/ton of wastewater. The study underscores the potential of waste wood flour biomass as a sustainable, low-cost solution for heavy metal remediation.
研究领域:
环境科学
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材料科学
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化学工程
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可持续技术
✓ 已验证
DOI
高影响因子
Toxics
·
2022
·Vol. 10
·期 9
·489
·
IF 4.472
Chunlin He,Yun Liu,Chunhui Zheng,Yanming Jiang,Yan Liao,Jiaxin Huang,Toyohisa Fujita,Yuezhou Wei,Shaojian Ma
Utilising waste amine-oxime (WAO) resin through microwave semi-carbonization, a carbon adsorbent (CA) was obtained to remove Pb(II). After microwave treatment, the pore size of the skeleton structure, three-dimensional porous network, and lamellar pore structure of WAO was improved. The distribution coefficient (Kd) of Pb(II) onto CA is 620 mL/g, and the maximum adsorption capacity of Pb(II) is 82.67 mg/g after 20 min of WAO microwave treatment. The adsorption kinetics and adsorption isotherms conform to the quasi-second-order kinetic equation and Langmuir adsorption isotherm model, respectively. The surface of MT-WAO is negatively charged and the adsorption mechanism is mainly electrostatic interaction. Pb(II) elution in hydrochloric acid solution is more than 98%, and its recovery is high at 318 K and for 1 h.
研究领域:
环境化学
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吸附科学
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资源回收利用
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水污染治理
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Yuehui Tan,Xirui Wan,Ting Zhou,Le Wang,Xianqiang Yin,Aisheng Ma,Nong Wang
In this study, a novel adsorbent made from kiwi branch biochar modified with Zn-Fe (KB/Zn-Fe) was compared with original biochar to the Pb(II)'s adsorptivity from waste water. The adsorbent was synthetized by liquid-phase deposition. Batches of sorption tests were performed, and the biochars' representative properties were tested. Characterizations revealed the physicochemical properties of biochars and showed that the KB/Zn-Fe composites were successfully synthesized. The Langmuir model and pseudo-second-order kinetic model were proven to satisfactorily fit the original biochar and KB/Zn-Fe. The KB/Zn-Fe showed Langmuir maximum adsorption ability to Pb (II) in aqueous solution of 161.29 mg g -1 , compared with 36.76 mg g -1 for original biochar. The adsorption ability of Pb(II) decreased and the Pb(II) removal efficiency increased with increasing biochar dose. The effect of co-existence of NO 3 - to the absorptive capacity of KB/Zn-Fe on Pb(II) was unremarkable, but Cl - could increase the absorptive capacity. Multiple Pb(II) adsorption mechanisms by KB/Zn-Fe include surface precipitation of metal hydroxides, complexation with active functional groups and ion-exchange. This work provides guidance for future production of biochar with efficient adsorption ability, which could be used to remove Pb(II) ions from wastewater.
研究领域:
环境科学
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化学工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Jinxin Liu,Pan Wang,Hengjia Zhu,Jianming Pan
Conventional heavy metal adsorbents are limited by passive mass transfer mechanisms that constrain separation efficiency in practical applications. Herein, we report a novel approach integrating autonomous nanomotor propulsion with selective molecular recognition for enhanced Pb(II) removal. Bullet-shaped Janus nanomotor adsorbents (JSNMs@IIPs) were synthesized through asymmetric emulsion templating, featuring silver nanoparticle-catalyzed propulsion chambers and ion-imprinted polymer recognition shells. Under H 2 O 2 fuel (10.0 wt%), JSNMs@IIPs exhibited controlled autonomous motion (23.1μm s −1 ) that delivered significant kinetic enhancement with 265 % faster adsorption rates compared to static systems. The JSNMs@IIPs achieved maximum Pb(II) adsorption capacity (158.5 mg g −1 at 318 K) while maintaining high selectivity (k = 16.8–61.3) against competing metal ions and excellent regenerability (93 % capacity retention over seven cycles). XPS analysis revealed coordination-based adsorption through Pb-N interaction formation within pre-organized imprinted cavities, while autonomous motion enhanced mass transfer through active convection. This work establishes motion-enhanced molecular recognition for advanced separation technologies, demonstrating that nanomotor propulsion can simultaneously improve kinetics and maintain selectivity in complex separation challenges.
研究领域:
环境科学
·
纳米技术
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材料科学
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化学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Wei Zhou,Pute Wu,Lin Zhang,Shengyu Yao,Delan Zhu,Yaohui Cai
Developing an ultra-thin polyamide selective layer with sufficient mechanical robustness on a highly porous ceramic substrate is challenging for removing heavy metal ions from wastewater. We synthesized a reliable ceramic-polyamide membrane by assembling nanocomposite interlayers of alumina and carbon black on the kaolin substrate. The surface morphology, pore size distribution, and roughness of ceramic substrates were improved by introducing the nanocomposite interlayer. The corresponding optimized water flux , Pb(II), and Cd(II) removal efficiency are 2.75 L m −2 h −1 , 98.44%, and 97.51%, respectively, which are better than those of the polyamide films constructed directly on the ceramic substrate. This facile structure provides more active sites for forming ultrathin polyamide layers with satisfactory mechanical robustness. This paper provides a new perspective for fabricating efficient heavy metal ions filters.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 66
·40196-40205
·
IF 3.119
Liwen Zheng,Yongchao Gao,Jianhua Du,Wen Zhang,Yujie Huang,Leilei Wang,Qingqing Zhao,Xiangliang Pan
We report here the preparation process of a recyclable magnetic biochar functionalized with chitosan and ethylenediaminetetraacetic acid (E-CMBC). This prepared biochar was then evaluated regarding its adsorption performance for Pb(II) from an aqueous solution along with the potential adsorption mechanisms behind this process. XRD and SEM analyses showed that the magnetite particles were successfully embedded into biochar and the subsequent surface coating of chitosan and ethylenediaminetetraacetic acid modification were also successful. The effects of the adsorbent dosage, ionic strength, initial solution pH, and contact time, on adsorption kinetics, adsorption isotherms, adsorption thermodynamics and regeneration performance were investigated. The removal of Pb(II) was dramatically improved to 156.68 mg g−1 compared with that by unmodified pristine biochar (10.90 mg g−1) at pH 3.0. In the range of pH 2.0–5.0, the adsorption performance of Pb(II) by E-CMBC remained above 152.50 mg g−1, which suggested that the adsorption capacity of the novel sorbent was not impacted by the competing adsorption of hydrogen cations under acidic conditions. The adsorption process could be well described by the Avrami fractional-order and Langmuir models. Thermodynamic analysis proved that the adsorption process was spontaneous and endothermic. The magnetic strength of E-CMBC was measured as 3.1 emu g−1, suggesting that the consumed E-CMBC could be separated from water by an external magnet. A regeneration study showed that after three cycles of adsorption–desorption, 78.60% of the sorbent was recovered and 97.26% of the adsorption capacity was retained. The adsorption mechanism investigation indicated that Pb(II) adsorption was mainly due to the presence of functional amides and carboxyl groups of E-CMBC forming strong chemical complexation. In conclusion, E-CMBC is a novel, recyclable, and highly efficient adsorbent for removal of Pb(II) from aqueous solution.
研究领域:
环境科学
·
材料科学
·
化学工程
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）