Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
IF 4.217
Likang Fu,Libo Zhang,Shixing Wang,Bing Zhang,Jinhui Peng
A new adsorbent was synthesized via functionalizing nano-silica with poly(methacryloxyethyltrimethyl ammonium chloride) (PDMC) for selective recovery of Au(III) from aqueous solutions. The adsorbent was characterized by FT-IR, TGA, XPS and TEM. A batch adsorption experiment was conducted to evaluate the adsorption capacity, reusability and selectivity. The maximum adsorption capacity of Au(III) was 127.3 mg/g at room temperature and the optimum pH 3.0. The adsorption equilibrium was achieved within 20 min. The adsorption process followed preferably the pseudo-second order kinetics and the Langmuir isotherm model. Ion exchange between gold ions and amines/chlorine groups played an important role in the adsorption process. The adsorption desorption cycles indicated that the adsorbent had a stable adsorption performance and retained high adsorption efficiency. Moreover, the adsorbent can selectively adsorb Au(III) from coexisting ions in aqueous solution. Therefore, nano-silica modified with PDMC could be of great potential in recovering Au(III) from industrial effluents and waste e-products.
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高影响因子
Minerals
·
2019
·Vol. 9
·期 7
·392
·
IF 2.25
Yangjian Cheng,Zhibin Ke,Xiaojing Bian,Jianhua Zhang,Zhen Huang,Yuancai Lv,Minghua Liu
The recovery of precious metals is a project with both economic and environmental significance. In this paper, how to use bacterial mineralization to selectively recover gold from multi-ionic aqueous systems is presented. TheBacillus licheniformisFZUL-63, isolated from a landscape lake in Fuzhou University, was shown to selectively mineralize and precipitate gold from coexisting ions in aqueous solution. The removal of Au(III) almost happened in the first hour. Scanning electron microscope with X-ray energy dispersive spectroscopy (SEM/EDS-mapping) results and fourier transform infrared spectroscopy (FTIR) data show that the amino, carboxyl, and phosphate groups on the surface of the bacteria are related to the adsorption of gold ions. X-ray photoelectron spectroscopy (XPS) results implied that Au(III) ions were reduced to those that were monovalent, and the Au(I) was then adsorbed on the bacterial surface at the beginning stage (in the first hour). X-ray diffraction (XRD) results showed that the gold biomineralization began about 10 h after the interaction between Au(III) ions and bacteria. Au(III) mineralization has rarely been influenced by other co-existing metal ions. Transmission electron microscope (TEM) analysis shows that the gold nanoparticles have a polyhedral structure with a particle size of ~20 nm. TheBacillus licheniformisFZUL-63 could selectively mineralize and recover 478 mg/g (dry biomass) gold from aqua regia-based metal wastewater through four cycles. This could be of great potential in practical applications.Keywords:selective biomineralization;recovery of Au(III);AuNP;Bacillus licheniformisFZUL-63;aqua regia-based metal wastewater
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高影响因子
MOLECULES
·
2023
·Vol. 28
·期 14
·5459
·
IF 4.6
Guangyuan Hu,Zhiwei Wang,Weiye Zhang,Hongxing He,Yi Zhang,Xiujun Deng,Weili Li
The recovery of precious metals from secondary resources is significant economically and environmentally. However, their separation is still challenging because they often occur in complex metal ion mixtures. The poor selectivity of adsorbents for gold in complicated solutions prevents further application of adsorption technology. In this study, a Zr-based MOF adsorbent, MIL-161, was synthesized using s-tetrazine dicarboxylic acid (H2STz) as an organic ligand. MIL-161 demonstrated a high adsorption capacity of up to 446.49 mg/g and outstanding selectivity for gold(III) in a simulated electronic waste solution as a result of the presence of sulfur- and nitrogen-containing groups. In addition, the MIL-161 adsorbents were characterized using Fourier transform infrared (FT-IR), field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TG), Brunner–Emment–Teller (BET), and X-ray photoelectron spectroscopy (XPS). Additionally, the adsorption kinetics, isotherms, and thermodynamics of the MOF adsorbents were also thoroughly examined. More importantly, the experimental results and DFT calculations indicate that chelation and electrostatic interactions are the main adsorption mechanisms.Keywords:selectivity;e-wastes;metal–organic framework;gold;adsorption;DFT calculations
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高影响因子
Frontiers in Chemistry
·
2019
·
IF 3.782
Zhang Ying,Qu Rongjun,Xu Ting,Zhang Yu,Sun Changmei,Ji Chunnuan,Wang Ying
To further increase the quantity and density of functional groups on adsorbent, terminal triethylenetetramine hyperbranched dendrimer-like polymer modified silica-gel (SG-TETA and SG-TETA2) was synthesized. The hyperbranched dendrimer-like polymer was successfully introduced onto silica gel and new cavities were formed, which was demonstrated by FTIR, SEM, and BET. The highest adsorption capacities of SG-TETA and SG-TETA2 obtained from Langmuir model toward Au(III) were 2.11, and 2.27 mmol g−1, respectively, indicating that SG-TETA2 possessing more functional groups had a better adsorption ability. Moreover, the adsorbents combined with Au(III) ion through chelation and electrostatic attraction mechanism, after which reduction reactions for Au(III) ion loaded on adsorbents proceeded. SG-TETA2 had better adsorption selectivity than SG-TETA in removing Au(III) in Au-existed ion solution systems. SG-TETA2 had higher overall adsorption capacities compared to silica-gel-based hyperbranched polymers functionalized by diethylenetriamine. Therefore, the effective recovery makes SG-TETA2 a practical adsorbent in removing Au(III) ion from e-wastes and industrial effluents with much prospect.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Chen Wang,Guo Lin,Jiling Zhao,Shixing Wang,Libo Zhang,Yunhao Xi,Xiteng Li,Ying Ying
A novel adsorbent (UiO-66-TA) was presented by modifying metal-organic framework composites with thioctic acid. UiO-66-TA were characterized by fourier transform infrared (FT-IR), field emission scanning electron microscopy (FESEM), thermogravimetric (TG), Brunner-Emment-Teller (BET) measurement and X-ray photoelectron spectroscopy (XPS), which indicating that it had excellent morphology and specific surface area. The adsorption performances of UiO-66-TA for Au(III) were studied. The results showed that UiO-66-TA had a strong adsorption capacity under acidic conditions and the optimal pH was 2.0. Isotherm and kinetic adsorption were also conducted and found that the experimental values correspond to Langmuir model and pseudo-second-order isotherm model, indicating that the mechanism is mainly chemical adsorption on a uniform surface. Wastewater experiment showed that UiO-66-TA can be used for highly selective recovery Au(III) in actual life. The regeneration and thermodynamic experiments indicated that UiO-66-TA can be reused and were a spontaneous endothermic process. XPS analysis and the zeta potential proved that the main adsorption mechanisms were ion exchange and chelation. DFT calculation found that there are two ways to combine Au with S on UiO-66-TA and their distances are 2.38 Å and 2.39 Å, indicating that the gold and sulfur play a major role in chelation. In summary, UiO-66-TA was a hopeful adsorbent and could be used to collect gold ions from wastewater in a sustainability perspective.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Yuqi Geng,Jiaqi Li,Wenjuan Lu,Ning Wang,Zeyang Xiang,Yanzhao Yang
In this paper, superparamagnetic Fe 3 O 4 @SiO 2 -NH 2 nanoparticles were applied to adsorb Au(III)/Pd(II)/Pt(IV) in HCl medium. The successful synthesis of Fe 3 O 4 @SiO 2 -NH 2 was characterized through TEM, SEM and FT-IR. Electrostatic interaction between magnetic NPs and metal anions was proposed as the main adsorption mechanism by zeta potential analysis. Maximum adsorption capacities and adsorption behaviors under metal anions concentrations, acidity, NaCl, kinetic and isotherm models were investigated. Notably, the Fe 3 O 4 @SiO 2 -NH 2 shows the excellent acidity and salinity resistance on Au(III), Pd(II) adsorption. The separation routine among Au(III), Pd(II) and Pt(IV) was proposed. As investigated, Pt(IV) could be isolated due to the less adsorption amount onto Fe 3 O 4 @SiO 2 -NH 2 (≤1%). Then, the adsorbed Au(III) was eluted selectively by HCl + N-hexanol alcohol + ethanol + H 2 O 2 mixing solution. Then, the adsorbed Pd(II) was completely eluted by thiourea solution. The recovery efficiencies of Au(III), Pd(II) and Pt(IV) were kept over 92%, 97% and 94% respectively, during 5 turns of cycling separation experiments. Total loss amount of Fe is around 7%. Hence that, the particle demonstrates the good stability and high adsorption capacity, which possess great potential for practical Au(III), Pd(II) and Pt(IV) separation.
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Journal of Cleaner Production
·
2018
·
IF 5.651
Guo Lin,Shixing Wang,Libo Zhang,Tu Hu,Jinhui Peng,Song Cheng,Likang Fu,C. Srinivasakannan
A bioadsorbent was synthesized by modifying corn bract with 2-aminothiazole for the selective recovery of gold. Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) were used to characterize the bioadsorbent with the aim of understanding the mechanism of adsorption. Adsorption isotherms and kinetics data were determined and modeled. The adsorption capacity of Au(III) was 1668 mg/g, much higher than the values reported in the literature due to the ion exchange and chelation between the amino/thiol groups and Au(III). Additionally, the effect of pH and other ions on the Au(III) adsorption capacity were assessed. The adsorption isotherm was found to be consistent with the Langmuir isotherm model, and the kinetic was consistent with the pseudo-second-order kinetic model . Further regeneration and cyclic adsorption tests were performed to ensure the effectiveness of the bioadsorbent in commercial applications.
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JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Dawei Xiang,Manying Zhu,Yuefeng Chen,Shixing Wang,Zhengwu Peng,Dekun Zhang,Likang Fu
Gold is a widely used non-renewable resource, and its recycling is the key to solve the problem of dwindling gold resources. In this study, a novel covalent organic framework adsorbent (COF-pPDI@TAP) is developed for efficient Au(III) capture. The synthesis of the adsorbent was confirmed by FTIR and XRD characterization. The adsorption performance of COF-pPDI@TAP was studied by batch adsorption experiments. The maximum adsorption of Au(III) by COF-pPDI@TAP reached 779.02 mg/g in the adsorption experiments. Kinetic and isotherm results show that the adsorption is a monolayer chemisorption process controlled by particle diffusion. The positive value of ΔH indicates that COF-pPDI@TAP needs to absorb energy to maintain the reaction during the adsorption of Au(III), and the reaction is endothermic. In addition, COF-pPDI@TAP maintained a very high adsorption efficiency after five cycles of experiments, and could selectively capture Au(III) from different concentrations of polymetallic solutions. COF-pPDI@TAP has excellent anti-interference ability and good reusability. It is demonstrated by zeta potential, XRD, XPS and FT-IR that electrostatic interaction, chelation and reduction occurred during the adsorption process. These studies demonstrate the value of COF-pPDI@TAP for gold recovery applications.
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JOURNAL OF HAZARDOUS MATERIALS
·
2024
·
IF 12.2
Xinrong Li,Shuliang Chen,Peng Yang,Yue Lin,Chen Chen,Xianzhi Hu,Futing Zi
With the gradual depletion of natural gold ore , waste printed circuit boards (WPCBs) have become one of the most attractive alternatives to gold ore. Here, a series of quaternary phosphonium adsorbents with a large size were successfully synthesized by adjusting the number of functional groups and carbon chain length of functional monomers , which can be used for selective recovery of gold(III) from WPCBs leaching solution . The quaternary phosphonium adsorbent (PS-TEP) prepared by the nucleophilic substitution reaction between triethyl phosphine with the smallest volume and chloromethylated polystyrene (PS-Cl) exhibited the best gold loading capacity (617.90 mg g −1 ). The adsorption mechanism of gold(III) on PS-TEP surface mainly involves anion exchange between AuCl 4 − and Cl − in the adsorbent. The charge level of the H atom closest to –CH 2 –P + group directly determines the strength of the interaction between the adsorbent and the gold ion . Multiwfn and VMD programs visually confirm the weak interaction between PS-TEP + and AuCl 4 − . After 5 adsorption-stripping cycles, the adsorption rate of gold(III) in solution remained at about 99 %. In addition, PS-TEP exhibited good gold(III) selectivity in both simulated and actual WPCBs gold leaching solutions. These results indicate that the large-particle PS-TEP with high capacity is suitable for selective gold recovery from WPCBs leaching solution.
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高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Meng Cheng,Xingtai Yan,Wenjing Liu,Ruihua Li,Gangfu Song
Designing and synthesizing sustainable adsorbents for the separation and recovery of gold from waste resources has significant importance to alleviate the problems of the scarcity of resource and environmental pollution. Herein, a cyanide-functionalized ionic liquid-modified polymer (CPR-CN) was prepared by a simple one-step process for gold (Au(III)) recovery. The introduction of cyan group and cationic imidazolium ring gives CPR-CN significant adsorption ability with 1450.41 mg/g. Kinetics study suggested that the uptake of Au(III) onto CPR-CN could be commendably matched by the pseudo-second order kinetic model and it took only 10 min to reach adsorption equilibrium. The CPR-CN had a remarkable selectivity towards Au(III) for it presented much overwhelming affinity for Au(III) than that for other base metal ions such as K(I), Co(II), Cu(II), Ca(II), Mg(II), Al(III) and Fe(III), thus it was successfully applied to recover Au(III) from e-waste leaching solution. Besides, the CPR-CN displayed preferable reusability, and the possible mechanism of CPR-CN for Au(III) was investigated with the aid of several characterization techniques. These performance of CPR-CN indicates it can serve as an attractive adsorbent to efficiently and selectively separate and recover Au(III) from waste.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xuan Huang,Ming Yi,Kewen Tang
To address resources shortage and environmental degradation, noble metal recovery from e-waste is in desperate need. Herein, to achieve selective extraction of gold (Au) and palladium (Pd) from practical e-waste, a series of tridentate thioether extractants are designed with ester functional groups at both ends of the thioether. By varying the chain length of the ester alkyl, the relationship between extractant structure and performance is further explored. The results indicate that the as-introduced tridentate structure facilitate the Au(III) and Pd(II) extraction, demonstrating a complex mechanism involving both coordination substitution and ion association. Notably, the extractant with the shortest carbon chain length and smallest molecular weight delivers outstanding extraction capacities of 920.2 mg/g for Au(III) and 280.7 mg/g for Pd(II). More importantly, it exhibits superior selectivity (∼100 %) for Au(III) and Pd(II) in complex metal solutions. This work guides the design of thioether-based extractants for sustainable recovery of noble metal from practical e-waste.
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POLYMER BULLETIN
·
2018
·Vol. 76
·期 8
·4017-4033
·
IF 1.589
Zhang Bing,Wang Shixing,Fu Likang,Zhang Libo,Zhao Jiling,Wang Chen
A new adsorbent was synthesized by functionalizing poly(glycidyl methacrylate) with 2,6-diaminopyridine for the selective adsorption of Au(III) from aqueous solution. The fourier transform infrared spectrometer, X-ray photoelectron spectroscopy and scanning electron microscope demonstrated that 2,6-diaminopyridine was successfully grafted onto poly(glycidyl methacrylate). The batch adsorption experiments were conducted to evaluate the adsorption abilities of the adsorbent. The results show that the adsorbent exhibits high adsorption capacity (459.29 mg/g) for Au(III) at pH 4. The adsorption process of Au(III) are well described by pseudo-second-order kinetic model. The adsorption isotherm is well-obeyed Langmuir and D–R models. The calculated thermodynamic parameters of the adsorption process are: Δ G 0 = − 24.2 kJ/mol; Δ H 0 = 37.0 kJ/mol; Δ S 0 = 205.4 J/mol K. The adsorbent is interacted with Au(III) through chelation and ion exchange between the amines groups and Au(III). Moreover, the adsorbent shows good selectivity from the interfering ions and can be reused at least five times.
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