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Removal Of Metal Ions

Xinhua Wang, Xin Li, Guangqing Liu, Yanfeng He, Chang Chen, Xiaoying Liu, Gang Li, Yiqin Gu, Yuqing Zhao
The physicochemical and morphological properties and the sorption capacities of discarded mushroom-stick biochar (DMB) prepared at different pyrolysis temperatures from 300 °C to 800 °C were explored. Results showed that the yield and surface oxygen-containing group content of DMB prepared at 300 °C (DMB3) were higher than those of DMB prepared at higher pyrolysis temperature (DMB5 and DMB8), while the DMB prepared at 800 °C (DMB8) had higher pH, mineral element and ash content, aromaticity, and polarity...
February 20, 2019: Environmental Science. Processes & Impacts
Raghava Reddiar Venkatakrishnan Hemavathy, Ponnusamy Senthil Kumar, Subburaj Suganya, Vaidyanathan Swetha, Sunita J Varjani
The present work demonstrates the preparation of Cassia fistula seeds for producing activated carbon through physical and chemical treatment for the extrusion of Ni(II) ion contaminated aqueous solution. The readily prepared sorbents were characterized using SEM-EDX and FTIR. The surface morphology of sorbents possesses 1 μm mean particle size with uniform size distribution. Furthermore, optimization of operating parameters such as the pH, initial Ni(II) ion concentration, adsorbent dose, time and temperature were investigated...
February 15, 2019: Bioresource Technology
Hong Yang, Yanling Hu, Xiaoyu Wang, Weng Fu, Huijuan Tian, Easar Alam
Removal of the heavy metal ions in aqueous solution is an important technology for waste water treatment. The effects of using ultrasonic and microwave on synthesizing Pb2+ , Zn2+ , and Cu2+ imprinted mesoporous adsorbents (Pb-IMA-UM, Zn-IMA-UM, and Cu-IMA-UM) and their dynamic adsorption properties were studied. The microstructure and composition of the ion-imprinted mesoporous adsorbents were discussed in detail by TEM, FTIR, N2 adsorption-desorption, XRD, and EDS. The pore sizes of mesoporous absorbents were improved more uniformly by using ultrasonic agitation than magnetic stirring...
February 20, 2019: Environmental Science and Pollution Research International
Xiaoqing Yu, Shuwei Sun, Lin Zhou, Zhicong Miao, Xiaoyuan Zhang, Zhiqiang Su, Gang Wei
Here we report the fabrication of graphene oxide (GO)-based membranes covalently combined with bovine serum albumin (BSA) for metal ions detection. In this system, BSA acts as a transporter protein in the membrane and endows the membrane with selective recognition of Co2+ , Cu2+ , AuCl₄- , and Fe2+ . Combining the metal-binding ability of BSA and the large surface area of GO, the hybrid membrane can be used as a water purification strategy to selectively absorb a large amount of AuCl₄- from HAuCl₄ solution...
February 16, 2019: Nanomaterials
Yi Wang, Weinan Zhao, Wanlan Zheng, Shuang Chen, Jinsheng Zhao
Porous activated carbon with specific morphology and structure are of particular importance for waste water treatment, especially for the adsorption of toxic hexavalent chromium Cr(VI). However, the scalable and cheap production of such absorbents still suffer a grand challenge. Herein, a new type of N-doped nanosheet was innovatively prepared from easily available and low-cost sewage sludge via a facile and recyclable KOH activation method. The N-doped porous carbon nanosheets (N-SAC) produced by introduction of KOH and dicyandiamide, which performed favourable features for metal ions adsorption (93...
February 15, 2019: Nanomaterials
Zhi-Wei Huang, Zi-Jie Li, Li-Rong Zheng, Wang-Suo Wu, Zhi-Fang Chai, Wei-Qun Shi
One of the most important reasons for the controversy over the development of nuclear energy is the proper disposal of spent fuel. Separation of actinide and lanthanide ions is an important part of safe long-term storage of radioactive waste. Herein, a three-dimensional (3D) graphene-based macrostructure (GOCS) was utilized to remove actinide thorium and lanthanide europium ions from aqueous solutions. The adsorption of Eu(III) and Th(IV) on the GOCS was evaluated as a function of adsorption time, solution pH, initial ion concentrations, and ionic strength...
February 4, 2019: Environmental Pollution
Zehai Xu, Lei Qin, Yufan Zhang, Xiong Li, Jilin Nan, Xinwen Guo, Guoliang Zhang
In this study, we develop a facile ion exchange strategy for in-situ assembly of novel spherical metal-organic composites on a large scale. The functional groups (-NH2 , -COOH and -SO3 H) on chelating and exchange resins had significant effects on improving uniform distribution of metallic sites and metal-support interaction. Without any addition of H2 O2 , Mn-based metal-organic composites realized the recovery of waste metallic ions and exhibited high activity for methylene blue (MB) electro-Fenton degradation (97...
February 14, 2019: Journal of Hazardous Materials
Wanjun Mu, Shenzhen Du, Xingliang Li, Qianhong Yu, Rui Hu, Hongyuan Wei, Yuchuan Yang, Shuming Peng
Efficient and irreversible capture of radioactive nuclides is an important environmental protection task when disposing of nuclear wastewater. This paper uses an "ion trapping" concept to design an efficient adsorbent based on a metal-organic framework (MOF), for removal of radioactive strontium from nuclear wastewater. Two functionalized MOFs were achieved by the introduction of sulfate or oxalate into the pore structure of MOF-808, giving MOF-808-SO4 and MOF-808-C2O4, respectively. These functionalized MOF-808 materials exhibit excellent ability to remove Sr2+ from acidic solution due to their particular trapping action, with the maximum Sr2+ adsorption capacities of 176...
February 18, 2019: Dalton Transactions: An International Journal of Inorganic Chemistry
Hui Yu, Qi-Zhi Zhong, Tian-Geng Liu, Wen-Ze Qiu, Bai-Heng Wu, Zhi-Kang Xu, Ling-Shu Wan
Deposition of dopamine and tannic acid has received great attention in the fields of surface and interface science and technology. The deposition behaviors of various metal-phenolic systems have been investigated, and it is generally accepted that at least one catechol group is essential to the formation of the coatings. Herein, we report a novel and effective surface coating system based on the coordination complexes of FeIII ions with a natural product juglone that contains only one phenolic hydroxyl. We investigated the deposition behaviors of this novel system on various substrates...
February 18, 2019: Langmuir: the ACS Journal of Surfaces and Colloids
Yingxun Du, Qiaoying Zhang, Zhengwen Liu, Hu He, Miquel Lürling, Musong Chen, Yunlin Zhang
Applications of aluminium (Al) salt or lanthanum (La) modified bentonite (LMB) have become popular methodologies for immobilizing phosphorus (P) in eutrophic lakes. The presence of humic substances, has been shown to inhibit this form of treatment due to the complexation with La/Al. However, the effects of other dissolved organic matter (DOM), especially that derived from phytoplankton (the dominant source in eutrophic lakes) are unknown. In this study, the interaction with La/Al of Suwannee River Standard Humic Acid Standard II (SRHA) and algae-derived DOM (ADOM) were investigated and compared...
February 5, 2019: Environmental Pollution
Elisabeth Vaudevire, Farzaneh Radmanesh, Annemieke Kolkman, Dennis Vughs, Emile Cornelissen, Jan Post, Walter van der Meer
The results of this sampling campaign on pilot scale processes aim to evaluate the occurrence and behavior of trace organic micro-pollutants and metal elements during anion exchange treatment of surface water and the subsequent treatment of generated spent brine with two types of electrodialysis membrane pairs. This knowledge is relevant to assess the quality and reusability of secondary products created during brine treatment; specifically the excess of sodium chloride to be recycled onsite and the natural organic matter, mostly consisting of humic substances, which find multiple applications in the agricultural industry...
February 4, 2019: Water Research
Kaling Taki, Anindita Gogoi, Payal Mazumder, Satya Sunder Bhattacharya, Manish Kumar
Efficacy of vermi-transformation for metal partitioning and transformation from Upflow Anaerobic Sludge Blanket (UASB) and Activated Sludge (AS) was investigated. Sludge samples were mixed with cow dung (CD) in two combinations (1:1 (UASB/AS:CD)) & (2:1(UASB/AS: CD)). Fractionation study revealed that Zn, Cd & Pb were associated with reducible fractions, and Cr, Cu with oxidizable fractions. Higher removal efficiency for 1:1 (UASB/AS: CD) combination over 2:1 (UASB/AS: CD) implies the non-significant contribution of cow dung during the metal stabilization process...
February 13, 2019: Journal of Environmental Management
Ndumiso Magagane, Vhahangwele Masindi, Munyadziwa Mercy Ramakokovhu, Mxoliso Brendon Shongwe, Khathutshelo Lilith Muedi
In this study, the authors report a facile thermal activation of non-reactive cryptocrystalline magnesite and explore its application on the treatment of acid mine drainage (AMD). The primary aim was to optimize the calcination-water interface reactive conditions. Parameters evaluated include calcination temperature, calcination time, AMD-calcination temperature interface, and AMD-calcination duration interface. PHREEQC geochemical modelling was also applied to substantiate obtained results. The results indicated that the formation of MgO and CaO increase with an increase in calcination temperature and time...
February 13, 2019: Journal of Environmental Management
Junyi Wang, Yucheng Li, Zhimin Lv, Yi Xie, Junjie Shu, Ahmed Alsaedi, Tasawar Hayat, Changlun Chen
A novel composite of zeolitic imidazolate framework grown on graphene oxide (ZIF-8@GO) was successfully prepared and used for the adsorption of Pb(II) and 1-naphthylamine from aqueous solutions. The effects of contact time, pH, ionic strength and temperature on the adsorption performance of ZIF-8@GO was investigated by batch experiments. Compared to the bare ZIF-8 and GO, the ZIF-8@GO exhibited a significant increase in the adsorption for Pb(II) and 1-naphthylamine. The maximum adsorption capacities of ZIF-8@GO towards Pb(II) and 1-naphthylamine reached 356...
February 11, 2019: Journal of Colloid and Interface Science
Chahrazad El Abiad, Smaail Radi, Maria A F Faustino, M Graça P M S Neves, Nuno M M Moura
Porphyrins show great promise for future purification demands. This is largely due to their unique features as host binding molecules that can be modified at the synthetic level, and largely improved by their incorporation into inorganic based materials. In this study, we assessed the efficacy of a hybrid material obtained from the immobilization of 5,10,15,20-tetrakis(pentafluorophenyl)-porphyrin on silica surface to remove Pb(II), Cu(II), Cd(II), and Zn(II) ions from water. The new organic-inorganic hybrid adsorbent was fully characterized by adequate techniques and the results show that the hybrid exhibits good chemical and thermal stability...
February 14, 2019: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Xin Sun, Fei Han, Hui Wang, Fupeng Song, Xiumin Cui, Yanhong Lou, Yuping Zhuge
Bioremediation is preferred in heavy metal remediation, and the high-performance microbe is of prime importance. In the present research, three Pb-resistant microbes were isolated and growth characteristics and adsorption capacities were evaluated. The results showed that R. oryzae SD-1, T. asperellum SD-5, and M. irregularis SD-8 can grow well under 100 mg L-1 Pb2+ ions stress. There is a higher minimum inhibitory concentration (MIC) of Pb but lower MICs of Cd and Zn in T. asperellum SD-5. However, there were similar MICs of Cu among the three microbes...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Yaoyue Li, Yanbo Zhou, Yi Zhou, Juying Lei, Shengyan Pu
A filter paper was functionalized with β-cyclodextrin and citric acid via esterification reaction for the removal of dyes and Cu ions from aqueous solutions. The adsorption capacity and removal performance of the modified filter paper (MFP) was investigated using static and dynamic adsorption experiments. The static adsorption data fit well the Langmuir and pseudo-second-order models, and the adsorption capacity of Methylene Blue (MB), Brilliant Green (BG), Rhodamine-B (RB) and Cu(II) over the MFP were 124...
December 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Gao-Peng Li, Kun Zhang, Peng-Feng Zhang, Wei-Ni Liu, Wen-Quan Tong, Lei Hou, Yao-Yu Wang
Owing to the rapid increase of Hg(II) ions in water resources, the design and development of new adsorbents for Hg(II) removal are becoming a significant challenge in environmental protection. Herein, a thiol-functionalized metal-organic framework (SH-MiL-68(In)) was successfully prepared through a post-synthesis modification procedure, and the framework intactness and porosity were well maintained after this process. SH-MiL-68(In) exhibited selective adsorption performance for Hg(II) ions in water. Meanwhile, SH-MiL-68(In) also shows a high adsorption capacity (450 mg g-1 ), large adsorption rate (rate constant k2 = 1...
February 14, 2019: Inorganic Chemistry
Daopeng Sheng, Lin Zhu, Xing Dai, Chao Xu, Peng Li, Carolyn Pearce, Chengliang Xiao, Jing Chen, Ruhong Zhou, Tao Duan, Omar K Farha, Zhifang Chai, Shuao Wang
99Tc contamination at legacy nuclear sites is one of the most serious and yet unsolved environmental issues associated with nuclear power development. Selective remediation of 99TcO4- in the presence of large excess of NO3- and SO42- from natural waste systems represents a significant scientific and technical challenge given anions with higher charge density are often preferentially sorbed by traditional anion-exchange materials, which is known as the Hofmeister Bias selectivity. We report here a solution to this challenge based on a stable three-dimensional cationic metal-organic framework material, SCU-102 (Ni2(tipm)3(NO3)4), formed by hydrophobic tetradentate neutral ligands and Ni2+ ions...
February 13, 2019: Angewandte Chemie
Smruthi G Prabhu, G Srinikethan, Smitha Hegde
Heavy metal pollution is a prevalent and critical environmental concern. Its rampancy is attributed to indiscriminate anthropogenic activities. Several technologies including biosorption have been continuously researched upon to overcome the limitations of the conventional method of treatments in removal of heavy metals. Biosorption technology involves the application of a biomass in its nonliving form. Pteris vittata L., a pteridophyte, considered as an invasive weed was investigated in the present study as a potential decontaminant of toxic metals, Cr(VI) and Cd(II)...
February 11, 2019: International Journal of Phytoremediation
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