ACS ES&T Water
·
2023
·
IF 5.3
Lijuan Wang,Jiawei Li,Gansheng Zhong,Jiangpeng Li,Xiao Lu,Siqing Wang,Yuanyuan Tang
To face the current critical challenges of gold recovery and beneficial utilization of solid waste, this study synthesized diatom biochar from the anoxic pyrolysis of diatoms and proved the superiority of the diatom biochar as a novel adsorbent for Au(III) in both synthetic and real electroplating wastewaters. The diatom biochar was found to have a high adsorption capacity of 443.0 mg/g and a superior recovery efficiency of up to 92.1%. The Au(III) adsorption kinetics followed the pseudo-second-order and intraparticle diffusion models. Electrostatic attraction and reduction were detected as the major adsorption mechanisms. An exceptional selectivity was also observed for the diatom biochar toward Au(III) with other coexisting heavy metals. Even in the presence of CN– in the solution, the diatom biochar still exhibited superiority in Au(III) adsorption. Owing to its high affinity to Au(III), the diatom biochar was successfully applied in real electroplating wastewater containing trace Au(III), with an adsorption efficiency as high as 96.7%. These findings sufficiently demonstrate the excellent performance and economic feasibility of diatoms for Au(III) recovery from electroplating wastewater, which also promoted solid waste minimization of diatom biorefineries.
研究领域:
环境科学
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材料科学
·
废物管理
·
水处理
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DOI
高影响因子
HYDROMETALLURGY
·
2022
·
IF 4.217
Yong Xiang,Yun Liu,Mingjie Li,Wencai Bai,Guoji Liu,Li Xu
The significance of recycling gold is self-evident. However, existing technologies for recovery of gold show several disadvantages, including their high costs, difficulty to recover adsorbent, as well as low adsorption capacity. Thus, an ecofriendly gold recovery system with low cost and high efficiency should be developed. In this study, a novel RFT-SA adsorbent (RFT:SA = 1:1) was developed, which was achieved by wrapping the self-assembled resorcinol-formaldehyde-thiourea (RFT) in sodium alginate (SA) hydrogels. This study suggests that it can make up for the shortcomings of powder adsorbent RFT that is difficult to collect, and it can fully use the high adsorption capacity and high selectivity of RFT. The RFT-SA adsorbent exhibited high adsorption capacity as Au(III) reached 603.4 ± 24.6 mg g −1 of M Au / M dry-gel . It is noteworthy that RFT-SA exhibited excellent selectivity to Au(III) in simulated electronic waste leachate containing Au(III) and other competing ions, thus suggesting that RFT-SA can recover gold efficiently under complex conditions. This study can provide a new idea for designing a novel type of adsorbents for precious metal ions with high adsorption capacity, high selectivity and being easy to collect for the efficient recovery of precious metals from electronic waste leachate.
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
·
2023
·
IF 15.1
Haiyan Kang,Yulong Luo,Chaopeng Liu,Zhongxian Song,Chaohai Wang,Xu Yan,Mengxia Ma,Xiaole Yan,Deming Gu,Yanli Mao
The recovery of Au(III) by adsorption has attracted extensive attention since it promotes solving the problems of environmental pollution and resource waste. Herein, we prepared the functionalized MCM-41 (MCM-NH 2 -OH) and explored the synergistic adsorption effects for Au(III). The adsorption capacity of MCM-NH 2 -OH reached 1664.9 mg·g −1 , which was 15.98 times and 2.99 times higher than MCM-NH 2 (104.2 mg·g −1 ) and MCM-OH (556.0 mg·g −1 ), respectively. The fitting kinetics experiments demonstrated that Au(III) adsorption by MCM-NH 2 -OH was conformed to the pseudo-second-order kinetic model. The adsorption rate of MCM-NH 2 -OH (2.62 × 10 -2 g·mg −1 ·min −1 ) was 346.1 times higher than MCM-NH 2 (7.57 × 10 -5 g·mg −1 ·min −1 ). The adsorption mechanism and the role of –NH 2 and –OH groups were investigated by XPS, XRD, and FTIR. More Au(III) can be adsorbed on –NH 2 groups by electrostatic attraction and chelation that provided electron acceptor for –OH groups, which further enhanced the reduction of Au(III) to Au(0). Further, MCM-NH 2 -OH exhibited superior selectivity and reusability for Au(III). Therefore, the synergy between –NH 2 and –OH groups is suitable for efficient adsorption-recover of gold applied in actual wastewater.
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
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Lingyuan Chen,Jiali Tang,Suoque Wu,Shixing Wang,Zhaogang Ren
A pyridine-modified chitosan ( PMCS ) adsorbent with excellent adsorption performance and specific selectivity for Au(III) in wastewater was prepared. FTIR, SEM, XPS and XRD were used to study its adsorption performance, and various models were used to fit and analyze the experimental adsorption data. The maximum adsorption capacity of PMCS for Au(III) is 549.41 mg/g (298 K, pH = 4). The data analysis results prove that the PSO and Langmuir models best describe the adsorption process. Adsorption experiments in the presence of multiple ions proved that PMCS is selective for the adsorption of Au(III). The adsorption and desorption experiments showed that the adsorption rate of PMCS could still reach 94.77% after three cycles. In summary, PMCS was demonstrated to be a high-quality material for the adsorption of Au(III) from wastewater due to its excellent adsorption performance, specific selectivity and reusability.
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
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
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.
研究领域:
化学工程
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材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2018
·
IF 4.513
Guo Lin,Shixing Wang,Libo Zhang,Tu Hu,Jinhui Peng,Song Cheng,Likang Fu
In this study, corn bract was modified with thiosemicarbazide (TSC-CCB) and used to selectively adsorb Au(III) from aqueous solutions. FT-IR spectroscopy, Scanning electron microscope and X-ray photoelectron spectroscopy were used to characterize TSC-CCB and investigate the adsorption mechanism. The results suggested that the maximum adsorption amount of Au(III) was 1470.22 mg/g at 25 °C with pH of 6.0. The adsorption isotherm and kinetic data were matched adequately with Langmuir model and pseudo-second-order model, respectively. Meanwhile, TSC-CCB presented a good selectivity for Au(III) from the competitive ions. The ion exchange and chelation between Au(III) and S/N groups played an important role in the enhancement of the adsorption capacity. The regeneration experiments suggested that the TSC-CCB retained high adsorption efficiency after three cycles. TSC-CCB was a promising adsorbent for recovery Au(III) from wastewater in the view of sustainability.
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
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.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 8
·1826
·
IF 4.6
Na Zhou,Xueli Wu,Shaoxia Wang,Jianfei Qu,Yang Tan,Chuanlei Luan,Xiuli Yin,Xuran Wu,Xuming Zhuang
In this work, amino-modified ZIF-90 (NH2-ZIF-90) was prepared by using butylamine as a modifier, and its effectiveness in adsorbing Au(III) from environmental samples was investigated. The morphology and structure of NH2-ZIF-90 were analyzed via SEM, XRD, FT-IR, and XPS. Optimal adsorption occurred after 12 h of shaking in a pH = 5 aqueous solution with 2 mg mL−1NH2-ZIF-90. The adsorption kinetics conformed to a pseudo-second-order model, and the equilibrium data fit the Freundlich isotherm model well. Finally, NH2-ZIF-90 was successfully used in lake water and tap water samples for Au(III) adsorption, with recovery rates ranging from 81.0% to 93.3%. This study presents a novel approach for addressing Au(III) adsorption challenges.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Fenglei Liu,Guilong Peng,Tong Li,Gang Yu,Shubo Deng
A novel bio-adsorbent (DACS-TA) was synthesized via a facile crosslinking reaction between tannin acid (TA) and dialdehyde corn starch (DACS), and the adsorption behavior of Au(III) from aqueous solution onto the DACS-TA was evaluated in batch adsorption experiments. Fourier Transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectroscopies were used to verify the successful crosslinking reaction, and the surface functional groups and the thermal stability of the prepared DACS-TA were also characterized. Adsorption results showed that the DACS-TA exhibited high adsorption capacity and selectivity towards Au(III), and the maximum adsorption capacity could reach up to 298.5 mg/g at pH 2.0 according to the Langmuir fitting. The adsorption isotherms of Au(III) on the DACS-TA were described well by the Langmuir model, indicating that the monolayer adsorption of Au(III) possibly occurred on the adsorbent surfaces. The kinetic data were fitted better by the Pseudo-second-order kinetic equation in comparison with the Pseudo-first-order and Intraparticle diffusion equations. Based on the SEM, XRD and XPS analysis, the adsorption-reduction mechanism of Au(III) on the DACS-TA was proposed. Namely, Au(III) was first adsorbed on the adsorbent and then was reduced to Au(0) while the phenolic group of TA was oxidized to carbonyl groups.
研究领域:
环境科学
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材料科学
·
化学工程
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 4
·1313-1319
·
IF 3.069
Xu Yang,Kunhao Yang,Li Wu,Jingkui Yang,Yujian He
Magnetic nanoparticles containing multiform heteroatoms on their surface have great potential for metal-ion recovery with a high throughput. In this study, a novel adsorbent (Fe3O4@CPTES@PEG) was developed to adsorb Au(III) from aqueous solution, which was synthesized by functionalizing Fe3O4 magnetic nanoparticles with poly(ethylene glycol) via a simple two-step reaction. Various techniques including Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis (TGA), vibrating sample magnetometry (VSM), transmission electron microscopy (TEM) and X-ray diffraction spectroscopy (XRD) were used to characterize the adsorbent, demonstrating that poly(ethylene glycol) was successfully grafted onto the Fe3O4 magnetic nanoparticles. Batch experiments were performed to investigate the effects of the initial concentration of Au(III), contact time and coexisting ions on the absorption of Au(III) from an aqueous solution at pH = 1.0. Simultaneously, the adsorption process was well-fitted with the Langmuir and pseudo-second-order models. The as-synthesized core–shell structured Fe3O4@CPTES@PEG showed a high performance towards Au(III) adsorption with the maximum adsorption capacity of about 83 mg g−1. Significantly, the material exhibited highly selective adsorption toward Au(III) in the presence of coexisting ions (Fe(III), Mn(II), Pb(II), Cd(II), Cu(II), Cr(III), Al(III), Mg(II), Zn(II) and Au(III)). Also, the material could be regenerated using ferrous sulfate, and exhibited excellent reutilization for at least three times without significant loss in its adsorption capacity after a simple post-treatment. Therefore, the proposed method shows enormous potential for practical applications in the selective separation and enrichment of Au(III) from aqueous solution at pH = 1.0.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Green Energy & Environment
·
2020
·
IF 6.395
Jiadi Liu,Minghuan Liu,Shaoyun Chen,Bingqing Wang,Jin Chen,Da-Peng Yang,Shangzhou Zhang,Wenxiao Du
Developing an environmental-friendly and highly active catalyst in transesterification for biodiesel production is of great importance for a more economic biodisel process. Herein, we reported that waste eggshells were used to adsorb Au(III) in water and convert the Au(III)-polluted eggshells into the functional nanocatalyst-CaO/Au for the transesterification reaction between soybean oil and methanol to the preparation of biodiesel. By coupling of CaO and Au nanoparticles, CaO/Au nanoparticles showed superior catalytic activity for the transesterification reaction between soybean oil and methanol. An optimum performance was observed over CaO/Au nanocomposites in a methanol-oil molar ratio at 12 : 1 with catalyst content of 1.0 wt% at 70 °C for 3 h. Besides, the catalytic activity of CaO/Au nanocatalyst was almost unchanged after recycling for 5 times and the yield of biodiesel still kept at 88.9%. The proof-of concept study provided us a sustainable method for utilization of waste eggshells to remedy the metal ions-polluted wastewater and the synthesis of functional nanocomposite for biodiesel production, show great potential application of waste eggshell in adsorption and catalytic reactions.
研究领域:
环境科学
·
催化化学
·
可再生能源
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产品关联
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2020
·
IF 2.929
Shaoxia Wang,Meirong Shen,Jianfei Qu,Xuming Zhuang,Shou-Qing Ni,Xuran Wu
In this study, mercapto-modified graphene/multi-walled carbon nanotube aerogels were facilely constructed by using L-cysteine as a cross-linking agent and modifier. The effective adsorption behaviors of Au(III) from environmental samples by the aerogels were investigated. The aerogels were characterized, and many influencing factors, such as pH value, adsorbent dosage, and contact time, were optimized. The kinetic data followed the pseudo-second-order model, and the equilibrium data fitted well to the Freundlich isotherm model. The maximum adsorption capacity for Au(III) reached approximately 47 mg g −1 . Moreover, the Au(III) could be desorbed with 1 M HCl containing 4% thiourea and detected by inductively coupled plasma atomic emission spectroscopy. Finally, the aerogels were used in lake water, seawater, and soil samples for Au(III) adsorption with recovery rates from 87.0% to 102.8%. The results indicate that the developed aerogel is an excellent adsorbent for removing Au(III) from samples and has significant application prospects in environmental research.
研究领域:
材料科学
·
环境科学
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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）