CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Junkang Guo,Xiaohu Fan,Jiayuan Wang,Shenghui Yu,Minwang Laipan,Xinhao Ren,Chao Zhang,Lei Zhang,Yongtao Li
The design and synthesis of efficient adsorbents for recovery of precious metal from secondary resources are of great environmental and economic significance. In present study, an efficient and redox-active adsorbent (UiO-66-BTU) was fabricated by modifying Zr-MOF (Zirconium-based Metal Organic Framework) with bisthiourea for gold recovery in aqueous solution. It is indicated that Au(III) adsorbing onto UiO-66-BTU is an irreversible, favorable chemisorption process conformed to D-R model and pseudo-second-order model. The UiO-66-BTU showed significant adsorption ability (680.20 mg/g at pH 2.0) and high selectivity towards Au(III) in presence of various mixed ions in actual wastewater, which were mainly attributed to the Lewis soft–soft interaction, ion-exchange/electrostatic interactions, and redox reaction between Au(III) and S-containing functional groups. Notably, we demonstrated that the reduction of Au(III) to metallic gold as a dominant recovery mechanism involving the in situ confined nucleation, fusion and growth of AuNPs to branched Au precipitation, with Au(0) accounted for approximately 80% for the recycling products. Furthermore, the UiO-66-BTU membrane achieved similar high adsorption capacity and the membrane surface remains active to efficiently recovered metallic particles with an excellent repeatability at eight cycles of adsorption. The reduced Au particles formed isolated clusters with bigger size and regular hexagonal shape. Consequently, UiO-66-BTU has great potential for gold recycling in industrial practice.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Jinghan Ren,Jie Wang,Mingqi Guo,Ruonan Li,Yueping Guan
Recovering gold from electronic wastewater is of great significance in alleviating the shortage of metal resources and reducing environmental pollution, especially considering the increasing number of discarded electronic devices. However, the ultra-low concentration of gold and the competitive interference of various metals pose significant challenges. In this work, we used Fe 3 O 4 nanoparticles and quaternary ammonium salt to recover gold from electronic wastewater. The method achieved a gold recovery efficiency of 98.2 % within just 3 min. The mechanism of gold recovery was investigated using techniques such as SEM, EDX, FT-IR, XPS, and XRD. The Au (III) ions were complexed with tetrabutylammonium nitrate to form the [N 4444 ][AuCl 4 ] complex, and this complex then aggregated with Fe 3 O 4 nanoparticles to form nanoclusters, while Fe (II) ions on the surface of Fe 3 O 4 nanoparticles reduced the Au (III) ions to Au (0). This study proposed a mechanism of complexation-aggregation-reduction-separation to recover gold. On application to a simulated electronic wastewater, the method exhibited excellent selectivity for Au (III), achieving a recovery efficiency of 99.1 %. The regeneration of Fe 3 O 4 nanoparticles can be readily performed by ultrasound, retaining a 96.7 % recovery rate of Au (III) even after six consecutive cycles. This study proposed the combination of Fe 3 O 4 nanoparticles and quaternary ammonium salt for gold recovery, which provided an environmentally friendly solution to address the increasing demand for precious metal resources in industry.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Chang Liu,Qinghan Wang,Peng Chen,Kaige Sun,Jianbo Li,Luis A. Cisternas,Shaoxian Song,Feifei Jia
MoS 2 materials performed well as adsorbent for Au(S 2 O 3 ) 2 3- recovery, but the effect of its crystal facets on recovery behavior and mechanism remained unclear. In this study, flower-shaped MoS 2 with exposed (110) facet and flake-shaped MoS 2 with (002) exposed facet have been synthesized through a simple hydrothermal method, and their recovery performance and mechanism for gold from Au(S 2 O 3 ) 2 3- solution were explored. The results indicated that MoS 2 materials could recover Au(S 2 O 3 ) 2 3- via adsorption and photocatalytic reduction. Importantly, MoS 2 materials with different exposed facets displayed crystal anisotropy, which greatly affected the recovery behavior of Au(S 2 O 3 ) 2 3- . Flake-shaped MoS 2 showed better dispersibility because of stronger surface electronegativity, and flower-shaped MoS 2 displayed better photocatalysis property thanks to more activated edge sites. The better dispersibility made flake-shaped MoS 2 have higher contact probability to Au(S 2 O 3 ) 2 3- molecules, resulting in faster recovery rate as well as higher recovery for Au(S 2 O 3 ) 2 3- with low concentration. Meanwhile, flower-shaped MoS 2 with better photocatalysis property could release more photogenerated electrons, so that achieving more excellent recovery for Au(S 2 O 3 ) 2 3- with high concentration. The finding in this study enhanced the understanding about the effect of MoS 2 facets on Au(S 2 O 3 ) 2 3- recovery, which had great significance for the design of MoS 2 structure and green production of gold in the future.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 48
·23386-23393
·
IF 3.925
Zhongmin Feng,Chuanyu Zhu,Yupu Meng,Zhuqing Wang
Poly(m-phenylenediamine) has a wide range of applications in adsorption due to its high amino content; however, its nanoparticles tend to aggregate in water and are not easily separated from aqueous solutions. In this research, a soft and easily separable adsorbent material was successfully prepared by cross-linking poly(m-phenylenediamine) and chitosan through hydrogen bonding. Experimental results showed that the prepared chitosan and poly(m-phenylenediamine) hybrid membrane (CS/PmPD) could selectively reduce Au(III) from a mixture of multiple metal ions (Cu2+, Zn2+, Ni2+, Cd2+, and Au(III)). The maximum treatment capacity of Au(III) reached 410 mg g−1 under optimal adsorption conditions (pH = 3.0 and adsorption time of 120 min). The CS/PmPD membrane can be regnerated after rinsing with sodium bisulfite solution, and its performance remains stable after multiple cycles. In addition, the membrane has achieved satisfactory results in treating the actual CPU gold-containing leachate. Therefore, the CS/PmPD membrane has a promising application in gold recovery from electronic wastes.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Metals
·
2021
·Vol. 11
·期 6
·919
·
IF 2.351
Feng Feng,Jiamei Liu,Mingxing Zhao,Lu Yu,Haixin Wang,Chunshan Lu,Qunfeng Zhang,Jia Zhao,Yanxia Sun,Jie Cen,Xiaonian Li
Gold as a precious metal resource has high recycling significance. However, the current extraction methods cannot achieve the both efficiency and environmental friendliness. In this paper, we propose a new gold leaching agent, which can leach gold under light condition by mixing iodoform (CHI3) with 1-butyl-3-methylimidazolium dicyanamide (BmimN(CN)2) ionic liquid. Under 25 °C and 13 W incandescent lamp irradiation, the leaching yield of gold can achieve 100 wt%, and the average leaching rate is 945 mg Au/(h·mol·CHI3) (18.9 times of that of the cyanidation method). Through the analysis of the results of radical inhibition experiment, UV-Vis and XPS, a possible leaching mechanism is proposed: the iodine radical generated by light oxidizes Au0to Au+, and then forms AuN(CN)2by coordinating with N(CN)2−. Subsequently, the ionic liquid and Au N(CN)2form a stable [Bmim]·[Au(N(CN)2)2] ion pair structure, further promoting the dissolution reaction. The leaching yield of gold can reach 81.9 wt% and 100 wt%, respectively, when applied to ore and waste electrical and electronic equipment (WEEE); the leaching yield of gold can also reach 100 wt% when applied to a waste catalyst by adding a Soxhlet extraction. The results show that this method is not only efficient, mild, and environmentally friendly, but also has strong adaptability and wide application prospects.Keywords:gold recovery;ionic liquid;free radical;waste catalyst;oxidation-complexation
研究领域:
化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yumeng Liang,Weiquan Zhan,Yuan Yuan,Noe Zamora-Romero,Feifei Jia,Bingqiao Yang,Zamoniddin Nasrddinov,José Luis Arauz-Lara,Shaoxian Song
The necessity for application of molybdenum disulfide (MoS 2 ) in photocatalytic reduction field required speedy improvement with high reduction and adsorption performance. Here, manganese (Mn) and oxygen (O) dual-doping strategy were taken for demonstrating that enhancing photocatalytic reduction could achieve simultaneous modulation of the reduction and adsorption parameters by optimizing the electronic configuration and hydrophilicity ability in MoS 2 . Benefiting from the Mn and O dual-doping collective effect, the developed Mn,O-MoS 2 exhibited outstanding photocatalytic reduction and recovery performances of gold(I) from thiosulfate leaching solutions with reduction capacity of 1386.98 mg/g and the corresponding recovery of 92.50%. Besides, Mn and O atoms dual doping in MoS 2 accelerated the recovery rate, which was 3 folds higher compared with that of MoS 2 . Experimental and first-principle approaches suggested that the reduction and adsorption ability of MoS 2 were strengthened through tuning the electronic structure and surface property with Mn and O dopants : (1) Mn atoms notably enhanced the conductivity and optimized the electronic structure for facilitating the reduction performance; (2) The incorporated O atoms greatly promoted the adsorption of [Au(S 2 O 3 ) 2 ] 3- by improving the affinity of water molecules and Mn,O-MoS 2 . The work provides a promising strategy to manipulate two-dimensional materials for various applications about catalysts and adsorbent.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
HYDROMETALLURGY
·
2019
·
IF 3.465
Yuqi Geng,Zeyang Xiang,Cheng Lv,Ning Wang,Yudong Wang,Yanzhao Yang
In this paper, 3 kinds of hydrophobic deep eutectic solvents were screened out for gold recovery due to their low viscosity, which were constructed by ionic liquids : [N 3333 ]Br, [N 4444 ]Br and [N 8881 ]Br and N-hexanoic acid. Anion exchange mechanism during the extraction process was proposed through the combination of UV–vis and FT-IR. Subsequently, the extraction behaviors under different conditions, such as: salinity (NaCl/NaBr), acidity and Au(III) concentration were investigated and discussed. N 8881 -Br-acid showed the best extraction ability: it showed the 96.8% extraction efficiency on 1 mM Au(III) solution, compared with N 4444 -Br-acid (around 93% on 0.6 mM) and N 3333 -Br-acid (around 91% on 0.6 mM). Besides that, the N 8881 -Br-acid showed the better salinity resistance among 3 DESs. The extracted Au(III) in the DESs phase was easily and completely stripped by applying 1 mL 0.1 g/mL NaBH 4 , and each extraction ability maintained after 5 turns of extraction cycle experiments. Since the excellent behaviors showed in the multi-metal selective extraction and extraction cycle experiments, the N 8881 -Br-acid was regarded as the most potential system for gold recovery from HCl medium. Furthermore, its operating conditions combination: operating temperature and vibration time were optimized to 19 °C and 13 min by applying response surface methodology (RSM). Under optimized conditions combination and given A/O = 1:1, the complete extraction procedure only needs two theoretical stages with a tiny amount (~5%) of Au(III) left, which is indicated by drawing Mccabe-Thiele diagram.
研究领域:
化学工程
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Biao Feng,Chengzhang Yao,Siyu Chen,Rui Luo,Shuhui Liu,Shanshan Tong
The design and synthesis of efficient adsorbing materials for recovery of precious metal are of paramount importance for fulfilling high-tech industry’s need. Herein, a one-step hydrothermal synthesis method was employed to construct the sulfur-rich MoS 2 nanoflakes under a mild condition. The first experiment evidence proved that MoS 2 nanoflakes were capable of capturing gold, with an extremely high uptake capacity (1133 mg g −1 ) and excellent selectivity. More importantly, MoS 2 nanoflakes showed preferential Au 3+ uptake behaviour compared with other precious metal ions such as Pd 2+ (47.6 mg g −1 ) and Pt 4+ (38.5 mg g −1 ). Different factors affecting the sorption process such as pH, adsorbent amount, contact time, ion strength , and reusability were systematically studied. The adsorption mechanism may be attributed to their intrinsically sulfur-rich characteristic for the strong soft–soft interactions between S atoms and Au atoms. These findings open up the possibility to expand the applications of sulfur-rich nanomaterials in the recovery of precious metal.
研究领域:
材料科学
·
环境化学
·
纳米技术
·
资源回收
·
配位化学
✓ 已验证
DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Liting Luo,Hao Li,Jiazheng Zhou,Wenjie Li,Abdul Haleem,Jianming Pan
Developing magnetic adsorbents with superior adsorption capability has always been a massive challenge. Herein, an in-situ growth strategy was implemented to build polydopamine-encapsulated lightweight hollow magnetic microspheres and used to achieve selective recovery of gold from e-waste. The fabricated magnetic-dielectric microspheres, including hollow magnetic polydopamine microspheres (HMPM) and hollow magnetic polydopamine microspheres modified by allyl thiourea (HMPM&A), exhibited excellent gold adsorption capacities of 1205 mg g −1 and 1766 mg g −1 , respectively at 298 K. The adsorption capacity was amazingly upsurged up to 1850 mg g −1 and 2715 mg g −1 under ultraviolet light, respectively, which is relatively enhanced compared to other reported magnetic adsorbents. The XPS survey and DFT calculations confirmed that Au(III) ions adsorption principally attributed to electrostatic interaction of N sites under acidic mediums and chelating interaction between Au(III) and S,N chelating site of thiourea groups, followed by subsequent reduction of Au(III) into to Au(0) with thiourea and dopamine units. The developed magnetic adsorbent showed impressive chemical stability for Au(III) adsorption up to eight consecutive adsorption-desorption cycles without any noticeable change in adsorption performance. The recovery rate of HMPM&A for Au(III) ions from actual samples was better up to 86.7 %. This work will broaden the construction strategy of magnetic adsorbents and promote the application of magnetic materials as an efficient functional material.
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
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 1.5
Li Yufang,Chen Yunlong,Zi Futing,Hu Xianzhi
Eco-friendly gold extraction from printed circuit boards (PCBs) is highly attractive due to the increasing demand for gold in various fields. The conventional Cu 2+ -NH 3 - S 2 O 3 2− method for PCBs involves polluting NH3 gas and requires additional copper. This study explored a new eco-friendly alternative using ethylenediamine (en) and thiosulfate to extract gold from CPU (the PCB material used in this study). The results showed that 81% of gold in CPUs could be successfully leached out after 48 h, using 10 mM ethylenediamine and 0.2 M thiosulfate. Various analyses, including SEM, ICP, XPS, were conducted to further investigate the process. It was found that the metal in CPU was Au(0) → Ni(II) → Cu(0) from the outside to the inside, and possible gold leaching mechanism was related to the oxidation of Cu(en) 2 2+ produced from CPU’s defective position and the presence of S 2 O 3 2− . As for Au(S 2 O 3 ) 2 3− recovery, different from our previous study, it is necessary to add a small amount of ethylenediamine (en) except for carbon and thiosemicarbazone (TSC); consequently, a gold adsorption efficiency of 99% was achieved. In summary, the leaching method proposed in this work solved the problem of NH 3 pollution of traditional one and achieves green, efficient, and selective gold adsorption from CPU leaching solution through a simple method, which is hopeful to replace the traditional unfriendly Cu-NH 3 - S 2 O 3 2− .
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
·
2025
·
IF 9
Yong Xiang,Chang-Yuan Cheng,Kang-Fei Lu,Wen-Cai Bai,Zhou-Xuan Zang,Li Xu,Guo-Ji Liu
Traditional metal–organic frameworks, characterized by their micropore-dominated structures, suffer from severe pore channel blockage during gold ion recovery due to the aggregation of gold nanoparticles, significantly reducing the utilization rate of adsorption sites. To address this issue, we developed hierarchically porous MOFs through ligand removal and metal exchange strategies, precisely installing adsorption sites within meso/macropores to effectively prevent pore obstruction by adsorbed-reduced gold particles. Subsequent Metal substitution further enhanced the material’s aqueous stability, enabling retention of 93 % adsorption capacity after 5 cycles while preserving the precisely engineered pore structure. The functionalized HP-MOF-5/DU achieves an ultrahigh Au(III) capacity of 1566 mg/g, rapid kinetics, and exceptional selectivity. Practical validation demonstrates 85 % gold recovery from real electronic waste leachates, with calcination yielding gold particles of 23.7 K purity. Through rational regulation of pore channel structures at adsorption sites, we have significantly enhanced the material’s Au(III) adsorption performance, pioneering a novel direction for the design of reducible metal-targeted adsorbents.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Yunshu Jiang,Yunlong Chen,Futing Zi,Xianzhi Hu,Shuliang Chen,Puqiang He,Li Zhao,Xinrong Li,Jiao Li,Yue Lin,Zhujuan Li
Compared with the cyanide method, the thiosulfate method is a green and clean gold production method, while gold recovery from thiosulfate solution is pending. Although the activated carbon adsorption method has been highlighted, current studies cannot avoid the complexity of activated carbon modification. This study used thiosemicarbazide (TSC) as the additive of the gold solution, investigating the gold recovery performance of pristine activated carbon and its adsorption mechanism. As a result, even for containing gold 100 mg/L, gold adsorption percentage close to 100% could be achieved on original carbon within 12 h when adding 0.02 g TSC. Next, under the optimal conditions, gold loading amount of 42.6 kg/t was attained after five-stage adsorption. Characterization via XPS , FT-IR, BET, and UV–vis verified the gold adsorption mechanism was related to TSC's decomposition into SCN − under activated carbon's catalysis, the formation of Au(SCN) 2 - and whose adsorption on the surface of original carbon. Furthermore, it was found that this method exhibited well gold recovery ability (99%) for gold in both Cu 2+ -en-S 2 O 3 2− and Cu 2+ -NH 3 -S 2 O 3 2− solutions; Additionally, well gold recovery performance (99%) was also achieved for two leaching solutions (Au: 35 and 42 mg/L, Cu 2+ : 3178 mg/L) of an actual ore. Last, gold desorption studies indicated that a good gold desorption rate of 95.3% was achieved within 24 h for carbon containing 5 kg/t of gold when using N, N-dimethylformamide (DMF) as desorbent . This paper gifted untreated activated carbon with excellent adsorption ability towards gold in thiosulfate system for the first time, which is meaningful for the cleaner production gold.
研究领域:
环境科学
·
材料科学
·
冶金工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）