Journal of Water Process Engineering
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2023
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IF 7
Haoran Dong,Shunyan Ning,Zengyuan Li,Sizhi Xu,Shichang Zhang,Xinpeng Wang,Youbin Wang,Lifeng Chen,Xiangbiao Yin,Toyohisa Fujita,Mohammed F. Hamza,Yuezhou Wei
Separation of palladium from high level liquid waste (HLLW) not only manages the dispose of HLLW, but could also aid in overcoming the shortage of palladium resources. Herein, three novel adsorbents, namely, 2-mercaptobenzimidazole (MBI)/XAD7HP, 2-mercaptobenzothiazole (MBT)/XAD7HP, 2-mercaptobenzoxazole (MBO)/XAD7HP were prepared by vacuum impregnation method using Amberlite XAD7HP resin (XAD7HP) as the carrier for the selective separation of Pd(II) from simulated HLLW. SEM-EDS (Scanning Electron Microscopy), BET (Brunauer-Emmett-Teller) and PXRD (Powder X-ray diffraction) analysis showed that the ligands were successfully impregnated into the carrier. The saturated adsorption capacities of MBI/XAD7HP, MBT/XAD7HP, MBO/XAD7HP in 0.5 M HNO 3 were 126.2 mg Pd/g, 137.6 mg Pd/g, 98.4 mg Pd/g, respectively, and excellent adsorption and separation performance towards Pd(II) ( SF Pd/other metals > 500 and K d > 10 4 mL/g from 0.1 to 4 M HNO 3 ) were also achieved. The adsorption kinetics and adsorption isotherms for Pd(II) matched well with pseudo-second-order kinetic model and Langmuir model, indicating that the adsorption for Pd(II) by three adsorbents were monolayer chemical adsorption . The adsorption mechanism was analyzed by FT-IR, XPS combined with DFT calculation. The extremely high selectivity of three adsorbents towards Pd(II) among 15 metal ions is due to the soft N and S donor atoms at ligands which have good affinity for Pd(II) in HNO 3 solution. As MBT/XAD7HP exhibited the best adsorption and separation properties, it is supposed to have more application potential for the separation of Pd(II) from HLLW.
研究领域:
化学工程
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环境科学
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材料科学
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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
Abdul Haleem,Fan Wu,Wenqing Wang,Mohib Ullah,Hao Li,Afzal Shah,Jianming Pan
Recovering palladium rapidly and effectively from electronic waste materials presents a challenging and essential task, mainly due to the harsh acidic conditions. This study developed a highly porous and lightweight monolith to address this issue by enabling rapid and efficient palladium adsorption under acidic conditions. The monoliths were fabricated through a quick UV -irradiation cryopolymerization process. The resulting monoliths exhibited significantly enhanced palladium adsorption capacity, measuring at 155.5 mg g −1 , surpassing most previously reported data. The adsorbed concentrations of Pd(II) and other coexisting ions were determined using an Inductively Coupled Plasma Optical Emission Spectrometer ( ICP-OES, VISTA-MPX, Varian ). Various parameters such as pH , contact time, temperature, concentration, and selectivity were investigated to assess their impact on palladium adsorption. The material demonstrated superior selectivity for palladium ions in the presence of coexisting metal ions. Furthermore, the material's thermal stability was evaluated within the 25 – 100 °C range, revealing sufficient adsorption capacity at temperatures up to 100 °C , indicating its potential for implementation in harsh conditions. The synthesized monolith exhibited a shelf life of up to six months without degrading its adsorption performance. Moreover, the material retained its adsorption efficiency after multiple cycles of use. The effectiveness of palladium adsorption was also demonstrated in actual wastewater samples, further validating the material's practical application. Overall, this designed system showcases excellent adsorption performance and stability, making a valuable contribution to polymer chemistry and environmental science for recovering precious metals from wastewater.
研究领域:
环境科学
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高分子化学
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Jiling Zhao,Chen Wang,Shixing Wang,Libo Zhang,Bing Zhang
Many industrial wastewaters contain large amounts of palladium and the recovery of palladium from wastewater has great significance. Here, a new adsorbent (PMA-SNP) was synthesized by modifying nano-silica with pyromellitic anhydride to selectively adsorb Pd(II) in wastewater. Fourier transform infrared spectroscopy, scanning electron microscopy, Brunauer–Emmett–Teller equation, X-ray photoelectron spectroscopy and transmission electron microscopy were employed to characterize the adsorbent. At 25 °C, the adsorbent has the higher adsorption rate in the pH range of 2 to 5. The adsorption equilibrium is reached in 480 min and the maximum adsorption capacity is 53.61 mg/g. The adsorption kinetics and isotherms accord with pseudo-second-order and Langmuir models, respectively. The results show that the adsorption process is monolayer adsorption and the rate-limiting step is chemical adsorption. After five cycles, the removal rate of Pd(II) by PMA-SNP decreased slightly from 71.18% to 66.11% with good reusability. The thermodynamic data revealed that the adsorption was a spontaneous exothermic process. PMA-SNP can selectively adsorb palladium from wastewater containing various coexisting ions. Adsorption mechanism is based on the electrostatic and chelation interaction between Pd(II) ion and the O and N atoms. It can be concluded that PMA-SNP is an effective and promising adsorbent for the recovery of palladium from 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
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Long Jiang,Yaojie Liu,Lulu Zhang,Liang Qin,Zongjiang Yu,Mo Xian,Weizhi Sun,Chao Xu
How to quantitatively describe metal–ligand interactions is the key to design high-affinity ligand. In this study, the electron transfer ratio (ETR), which correlated 34 chemical ligands with the electron donating ability, allowed for obtaining six high affinity multidentate S/N-containing ligands, and the interactions were further analyzed by frontier orbital and electrostatic potential calculation. Furthermore, six corresponding ligand-modified polystyrene framework materials were prepared by efficient derivatization of isothiocyanates and primary amines. The optimal material CMPS-BD had an adsorption capacity up to 4.07 mmol/g with good tolerance to different organic solvents. CMPS-BD exhibited excellent adsorption efficiency in combination with kinetics, thermodynamics, selectivity and regeneration performance. Moreover, the remarkable practicability was achieved as the removal rate reached 99.8 %, and the residual Pd 2+ concentrations were reduced to less than 5 mg/L in three kinds of Pd-catalytic reaction waste liquids. Through mechanism analysis, 1 mmol ligand FA ∼ BD could bind 0.75 ∼ 1.74 mmol Pd 2+ which was consistent with the ETR tendency, certifying the accuracy and efficiency of this method. Intensive DFT calculations revealed that the optimal ligand BD could generate a variety of spontaneous endothermic intermolecular and intramolecular coordination reactions.
研究领域:
化学
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材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Jian Feng,Meng Xie,Derong Xu,Zhenzhen Tang,Chunlin He,Shunyan Ning,Min Li,Guoyuan Yuan,Songshan Jiang
Separation and recovery of palladium from industrial waste is an environmental way to utilize the valuable secondary resources. Metal-organic framework (MOF) has a great potential for the adsorption of Pd(Ⅱ) from aqueous solutions, but the tiny powder form of MOF restricts its practical applications. In this work, a feasible and green method is developed to prepare novel MOF composite beads (B-MOF) with a stable cross-linked network. The adsorption performance of B-MOF for Pd(Ⅱ) was evaluated in acidic solutions. Comprehensive characterization results show that the structure of B-MOF is stable throughout the adsorption process. At pH 3.0, the adsorption capacity of Pd(Ⅱ) on B-MOF was high up to 334.68 mg.g −1 , exhibiting superiority to most of the other congeneric adsorbents. The adsorption behavior accorded with the pseudo-second-order kinetic model and the Langmuir adsorption isotherm, which was a spontaneous and endothermic chemisorption process. Moreover, the adsorption performance of B-MOF persisted almost unchanged even after 12 regeneration cycles. B-MOF also demonstrated high selectivity to Pd(Ⅱ) in the presence of interfering ions, including Na(Ⅰ), K(Ⅰ), Ni(Ⅱ), Mg(Ⅱ), Cu(Ⅱ), Zn(Ⅱ), Co(Ⅱ), Ca(Ⅱ) and Al(III). Mechanism studies reveal that Pd(Ⅱ) can be adsorbed on B-MOF by the inner-sphere complexation to Zr-nodes and the electrostatic attraction with protonated amine groups. The recovery of Pd from a real industrial waste was successfully achieved with a recovery rate of 92.5 %. This study provides an effective method to improve the practicability of MOF-based materials and may open a new way for the disposal of industrial waste containing palladium.
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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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）