JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2016
·Vol. 310
·期 3
·1335-1344
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IF 0.983
Lai Zhong-jun,Zhang Zhi-bin,Cao Xiao-hong,Dai Ying,Hua Rong,Le Zhang-gao,Luo Min-biao,Liu Yun-hai
A novel chelate sorbent (bis-3,4-dihydroxybenzy) p -phenylen diamine-grafted hydrothermal carbon spheres (HCS-BDBPD) had been successfully synthesized through chemical grafting method. FT-IR and SEM were used to analyze the chemical and microscopy structure of HCS-BDBPD. The batch experiments were carried out to study uranium adsorption properties of HCSs-BDBPD aimed at confirming the optimum condition for removal uranium from waste. The result showed that the sorption process was spontaneous and endothermic in nature and the maximum uranium sorption capacity of 272 mg/g was obtained under the conditions tested, the selectivity of HCSs toward uranium was improved after grafting BDBPD groups on the surface of HCSs.
研究领域:
环境科学
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材料化学
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DOI
高影响因子
CHEMOSPHERE
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2025
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IF 8.1
Jelena Petrović,Xiao-Han Pan,Zeynep Talip,Jian-Hua Zu,Đorđe Cvjetinović
This study explores the effectiveness of radiografted chelating adsorbents for the recovery of rhodium (Rh) from acidic wastewater, focusing on functionalized materials with and without loaded silver (Ag). Platinum group metals (PGMs), particularly Rh, are essential yet rare, necessitating efficient recovery methods from industrial waste. Rh exhibits complex chemistry in acidic environments, often complicating its extraction and recovery. Traditional methods such as solvent extraction and ion exchange adsorption have limitations, prompting the development of alternative recovery methods. The adsorption efficiency of these materials was evaluated in a wide range of hydrochloric acid (HCl) concentrations, both in static and dynamic conditions. Radiotracer 101 Rh was used to track and quantify Rh adsorption. Results show that the radiografted chelating adsorbents exhibit high distribution coefficients ( K d , LogK d ≈ 3) and high adsorption capacities ( Q c > 74 mg/g), comparable or superior to commercial resins, particularly under varying pH conditions. Selective recovery of Rh was achieved even in the conditions of extreme competition (with additional 21 metal ions). Therefore, amine and amide-based adsorbents presented in this study could offer a sustainable and inexpensive alternative to standard methods of Rh recovery from industrial waste.
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
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2024
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IF 3.8
Jian-hua Zu,Xiao-han Pan,Xing-dong Su,Feng Liu,Jie Zhan,Ye He,Jiu-geng Chen
The removal of zinc ions (Zn(II)) in water and the separation of zinc isotopes were fully investigated in this study. Imidodiacetic acid (IDA) type adsorbent (named PSGI) based on polystyrene spheres (PS) was synthesized by simultaneous irradiation grafting. By adsorption method, the removal of Zn(II) from water by the chelating adsorbent was studied in batch experiments. Under optimized condition, PSGI showed the removal efficiency of more than 98 % for Zn(II) and the adsorption capacity of 70.1 mg/g. Langmuir isothermal and pseudo-second-order kinetic model fitted the experimental results better, indicating that the adsorption is dominated by chemical adsorption. The spent adsorbent (PSGI-Zn) was used for further zinc isotope separation by displacement chromatography using EDTA-NH 4 solution as eluent. Due to the mass effect of isotopes, 70 Zn was found to preferentially fractionated into the front-end effluents with the highest front enrichment values of 70 Zn/ 64 Zn. By extending the migration distance to 20 m, we obtained the best isotope enrichment with the front maximum enrichment values as 1.0949, 1.0739 and separation coefficient values as 1.977 × 10 −3 , 8.33 × 10 −3 corresponding to the isotope pairs 66 Zn/ 64 Zn, 68 Zn/ 64 Zn.
研究领域:
环境科学
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化学
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材料科学
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DOI
PubMed
高影响因子
BioNanoScience
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2025
·Vol. 15
·期 3
·1-17
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IF 3.2
Lu Tianwen,Dai Yixuan,Shi Yue,Wang Xiaojun,Hong Yinan,Pan Hong,Wu Zhansheng
Laccase is a kind of green biocatalyst which is widely distributed in nature. However, the application of free laccase was greatly limited due to the poor stability and low utilization. In order to prepare a carrier with abundant immobilized sites, This study designed a novel magnetic dendrimers (MPG-x) as an excellent carrier for immobilizing laccase. Fe 3 O 4 was used as the core, and the desired MPG-x was obtained by modifying the surface of Fe 3 O 4 with hyperbranched polyaminoamide (PAMAM) dendrimers. Due to its controllable generation number, this carrier can provide a relatively abundant number of surface binding sites for laccase immobilization. Then the immobilized laccase MPG-2@GA-Lac and MPG-2@Cu 2+ -Lac were prepared by glutaraldehyde crosslinking and copper chelating adsorption, respectively. The results showed that the loading of MPG-2@GA-Lac and MPG-2@Cu 2+ -Lac reached 48.9 mg/g and 50.6 mg/g respectively, and MPG-2@GA-Lac and MPG-2@Cu 2+ -Lac retained 74.4% and 108.1% of the initial free laccase activity, respectively. In addition, the two immobilized laccase showed better pH stability, temperature stability, thermal stability and storage stability than free laccase. The activation of Cu 2+ in the active center of laccase made MPG-2@Cu 2+ -Lac exhibit better stability. Methyl orange (MO) removal experiments showed that MPG-2@Cu 2+ -Lac exhibited higher MO removal efficiency (82.56%) over a wider pH and temperature range than MPG-2@GA-Lac (72.19%), and MPG-2@Cu 2+ -Lac maintained a MO removal efficiency of 66.18% after 6 cycles of operation. This study is expected to further expand the application of laccase in the degradation of dye wastewater.
研究领域:
环境科学
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生物技术
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纳米技术
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酶工程
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废水处理
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Hongrui Xiang,Feiping Zhao,Tao Wu,Xiaowei Zhang,Fei Chai,Qingwei Wang,Eveliina Repo,Xiaobo Min,Zhang Lin
Understanding the structure–activity relationship between the adsorption performance and accessible adsorption sites plays a vital role in developing efficient adsorbents for Ge(IV) recovery. Herein, three chitosan-based adsorbents were designed by grafting chitosan with p -hydroxybenzoic acid (HBA-CS), 3,4-dihydroxybenzoic acid (DBA-CS), and 3,4,5-trihydroxybenzoic acid (TBA-CS), and the phenolic hydroxyl amounts induced steric effect on Ge(IV) recovery was investigated. The results show that phenolic acids were successfully grafted onto the chitosan surface by an amidation reaction. The adsorption behavior of DBA-CS and TBA-CS conforms to the pseudo-second-order kinetic and Langmuir isotherm models, indicating that it is a single layer adsorption and chemisorption is the main adsorption process . The Ge(IV) recovery performance is correlated with the arrangement of the active adsorption sites and follows the order of TBA-CS > DBA-CS > HBA-CS. The steric effect of TBA-CS is more ideal than that of DBA-CS due to more phenolic hydroxyl groups, which endows it better affinity toward Ge(IV). Additionally, TBA-CS exhibits superior selectivity in the presence of competitive cations and interfering anions, and the adsorption efficiency was not significantly decreased after four regeneration cycles by the acid elution. The chelation adsorption sites for Ge(IV) provided by the o -phenolic hydroxyl groups are the dominant contribution, and the hydrogen bond and ideal steric effect further enhance the adsorption performance of TBA-CS. The structure regulation designed by steric hindrance optimization strategy to achieve high affinity is an attractive approach, which could be extended in the recovery of precious metal ions.
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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DOI
高影响因子
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