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https://www.readbyqxmd.com/read/28341379/the-rapid-adsorption-microbial-reduction-of-perchlorate-from-aqueous-solution-by-novel-amine-crosslinked-magnetic-biopolymer-resin
#1
Wen Song, Baoyu Gao, Hailan Wang, Xing Xu, Moxi Xue, Minchao Zha, Bo Gong
The aim of this work was to study the adsorption characters of resin, microbial reduction of perchlorate and combined process of perchlorate removal in aqueous solution. Study demonstrated the adsorption equilibrium was achieved in 120min, which based on ion exchange reaction. Dissolved perchlorate (100mg/L) can be completely removed by acclimated anaerobic sludge in 15h, and the concentrated perchlorate (∼200mg/g) on the surface of resin would be effectively microbial reduced after 3days. Neutral environment (pH=7...
March 12, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28340775/quantification-of-226-ra-at-environmental-relevant-levels-in-natural-waters-by-icp-ms-optimization-validation-and-limitations-of-an-extraction-and-preconcentration-approach
#2
François Lagacé, Delphine Foucher, Céline Surette, Olivier Clarisse
Radium (Ra) at environmental relevant levels in natural waters was determined by ICP-MS after an off-line pre-concentration procedure. The latter consisted of Ra selective elution from potential interfering elements (i.e. other alkaline earth cations: Ba(2+), Sr(2+), Ca(2+), Mg(2+)) on a series of two different ion exchange resins (AG50W-X8 and Sr-resin). The overall analytical method was optimized according to the instrumental performance, the volume of water sample loaded on resins, and the sample salinity...
May 15, 2017: Talanta
https://www.readbyqxmd.com/read/28337628/study-of-plasma-off-gas-treatment-from-spent-ion-exchange-resin-pyrolysis
#3
Hernán Ariel Castro, Vittorio Luca, Hugo Luis Banchi
Polystyrene divinylbenzene-based ion exchange resins are employed extensively within nuclear power plants (NPPs) and research reactors for purification and chemical control of the cooling water system. To maintain the highest possible water quality, the resins are regularly replaced as they become contaminated with a range of isotopes derived from compromised fuel elements as well as corrosion and activation products including (14)C, (60)Co, (90)Sr, (129)I, and (137)Cs. Such spent resins constitute a major proportion (in volume terms) of the solid radioactive waste generated by the nuclear industry...
March 23, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28333046/effect-of-competing-ions-and-causticization-on-the-ammonia-adsorption-by-a-novel-poly-ligand-exchanger-ple-ammonia-adsorption-reagent
#4
Quanzhou Chen, Kanggen Zhou, Yuanjuan Hu, Fang Liu, Aihe Wang
In this paper, a poly ligand exchanger, Cu(II)-loaded chelating resin named ammonia adsorption reagent (AMAR), bearing the functional group of weak iminodiacetate acid, was prepared to efficiently remove ammonia from solutions. Batch adsorption equilibrium experiments were conducted under a range of conditions. The effects of pH on the removal of ammonia by AMAR were investigated at 25 °C. The copper loaded on the resin forms a complex with NH3 in solution under alkaline condition. The effect of alkaline dosage (AD) on the ammonia adsorption was investigated...
March 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28330182/efficient-single-step-chromatographic-purification-of-recombinant-human-antithrombin-rhat-from-saccharomyces-cerevisiae
#5
Maheswara Reddy Mallu, Sandeep Vemula, Srinivasa Reddy Ronda
Antithrombin (AT) is a glycoprotein that inactivates the several physiological target enzymes of coagulation system. The effect of purification strategies plays a crucial role in getting maximum recovery of yield, purity and biological activity of recombinant human antithrombin (rhAT). In the present work, the task of purifying rhAT from Saccharomyces cerevisiae BY4741 has been carried out using two different approaches such as cross flow filtration (CFF) system and chromatography methods. In the first approach, the protein was concentrated and partially purified through CFF to achieve maximum recovery yield and purity of 87 and 94 %, respectively...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28315605/green-synthesis-of-bacterial-cellulose-via-acetic-acid-pre-hydrolysis-liquor-of-agricultural-corn-stalk-used-as-carbon-source
#6
Zheng Cheng, Rendang Yang, Xu Liu, Xiao Liu, Hua Chen
Herein, bacterial cellulose (BC) was synthesized by acetobacter xylinum via organic acid pre-hydrolysis liquor of agricultural corn stalk used as carbon source. Acetic acid was applied to pretreat the corn stalk, then, the prehydrolysate was detoxified by sequential steps of activated carbon and ion exchange resin treatment prior to use as carbon source to cultivate acetobacter xylinum. Moreover, the recovery of acetic acid was achieved for facilitating the reduction of cost. The results revealed that the combination method of detoxification treatment was very effective for synthesis of BC, yield could be up to 2...
March 2, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28302975/chromatographic-separation-of-cd-from-plants-via-anion-exchange-resin-for-an-isotope-determination-by-multiple-collector-icp-ms
#7
Rongfei Wei, Qingjun Guo, Hanjie Wen, Marc Peters, Junxing Yang, Liyan Tian, Xiaokun Han
In this study, key factors affecting the chromatographic separation of Cd from plants, such as the resin column, digestion and purification procedures, were experimentally investigated. A technique for separating Cd from plant samples based on single ion-exchange chromatography has been developed, which is suitable for the high-precision analysis of Cd isotopes by multiple-collector inductively coupled plasma mass spectrometry (MC-ICP-MS). The robustness of the technique was assessed by replicate analyses of Cd standard solutions and plant samples...
2017: Analytical Sciences: the International Journal of the Japan Society for Analytical Chemistry
https://www.readbyqxmd.com/read/28286078/one-pot-synthesis-of-chitosan-grafted-quaternized-resin-for-the-removal-of-nitrate-and-phosphate-from-aqueous-solution
#8
H Thagira Banu, Sankaran Meenakshi
The present study deals with the synthesis of chitosan quaternized resin for efficient removal of nitrate and phosphate from aqueous solution. The resin was characterized with FTIR, SEM with EDX and XRD. Batch method was carried out to optimize various parameters such as contact time, initial concentration of nitrate and phosphate, dosage, pH, co-anions and temperature on the adsorption capacity of the adsorbent. The adsorption process illustrated that the Freundlich isotherm and the pseudo-second order are the best fitted models for the sorption of both anions...
March 9, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28279938/efficient-control-of-membrane-fouling-in-mf-by-removal-of-biopolymers-comparison-of-various-pretreatments
#9
Katsuki Kimura, Yasumitsu Oki
In recent studies on membrane fouling in microfiltration (MF) and ultrafiltration (UF) for drinking water production, hydrophilic macromolecular organics referred to as biopolymers have been shown to be major players in the fouling. In this study, various pretreatments were compared to maximize removal of biopolymers and to control membrane fouling efficiently. Multiple water samples were collected from different drinking water sources and were used in this study. Coagulation using polyaluminum chloride (PACl) was carried out under conditions of different dosages and different pHs and was also carried out in combination with the use of powdered activated carbon (PAC) or magnetic ion exchange (MIEX(®)) resin...
February 20, 2017: Water Research
https://www.readbyqxmd.com/read/28278089/integrating-fenton-s-process-and-ion-exchange-for-olive-mill-wastewater-treatment-and-iron-recovery
#10
Patrícia M Reis, Pedro J M Marques, Rui C Martins, Licínio M Gando-Ferreira, Rosa M Quinta-Ferreira
A novel integrated methodology involving Fenton's process followed by ion exchange was proposed for the treatment of olive mill wastewater. The Fenton's process was optimized and it was able to remove up to 81% of COD when pH 3.5, reaction time 1h, [Fe(2+)] = 50 mg.L(-1) and [Fe(2+)]/[H2O2] = 0.002 were applied. In spite of the potential of this treatment approach, final iron removal from the liquid typically entails pH increase and iron sludge production. The integration of an ion exchange procedure using Lewatit TP 207 resin revealed to be able to overcome this important environmental shortcoming...
March 1, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28272860/fabrication-of-stable-and-regenerable-amine-functionalized-magnetic-nanoparticles-mnfe2o4-sio2-nh2-as-a-potential-material-for-pt-iv-recovery-from-acidic-solutions
#11
D Harikishore Kumar Reddy, Wei Wei, Shuo Lin, Myung-Hee Song, Yeoung-Sang Yun
MnFe2O4@SiO2-NH2 magnetic nanocomposite (AFMNC) adsorbent with a particle size of ~50 nm was successfully synthesized using a facile approach. The as-prepared composite particles showed a fast binding of Pt(IV) with easy magnetic solid-liquid separation. The kinetic data were fitted to both pseudo-first and pseudo-second-order rate models, indicating that AFMNC exhibited a much higher rate of Pt(IV) binding (0.125 g mg-1 min-1) compared with commercial ion exchange resin Amberjet 4200 (0.0002 g mg-1 min-1)...
March 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28259813/integrated-bicarbonate-form-ion-exchange-treatment-and-regeneration-for-doc-removal-model-development-and-pilot-plant-study
#12
Yue Hu, Treavor H Boyer
The application of bicarbonate-form anion exchange resin and sodium bicarbonate salt for resin regeneration was investigated in this research is to reduce chloride ion release during treatment and the disposal burden of sodium chloride regeneration solution when using traditional chloride-form ion exchange (IX). The target contaminant in this research was dissolved organic carbon (DOC). The performance evaluation was conducted in a completely mixed flow reactor (CMFR) IX configuration. A process model that integrated treatment and regeneration was investigated based on the characteristics of configuration...
February 8, 2017: Water Research
https://www.readbyqxmd.com/read/28259735/ion-exchange-resins-as-additives-for-efficient-protein-refolding-by-dialysis
#13
Jakub Gabrielczyk, Hans-Joachim Jördening
The most significant drawback of bacterial protein production involving inclusion bodies is the subsequent refolding into bioactive form. Implementation of refolding operations in large-scale applications often fails due to low yields and/or low product concentrations. This paper presents a simple method of integrated refolding by dialysis and matrix assisted refolding that combines advantages of both methods, high product concentrations and high refolding yields. Ion exchange resins (IER) and size exclusion media served as refolding additives and were added to solubilized protein prior to refolding by continuous exchange of dialysis buffer...
March 1, 2017: Protein Expression and Purification
https://www.readbyqxmd.com/read/28259068/enhancement-of-microbial-density-and-methane-production-in-advanced-anaerobic-digestion-of-secondary-sewage-sludge-by-continuous-removal-of-ammonia
#14
Bing Tao, Joanne Donnelly, Ivo Oliveira, Ruth Anthony, Victoria Wilson, Sandra R Esteves
Ammonia inhibition mitigation in anaerobic digestion of high solids content of thermally hydrolysed secondary sewage sludge by the NH4(+) affinitive clinoptilolite and a strong acid type ion-exchange resin S957 was investigated. Continuous NH4(+)-N removal was achieved through ion-exchanging at both temperatures with average removals of 50 and 70% for the clinoptilolite and resin dosed reactors, respectively. Approximate 0.2-0.5unit of pH reduction was also observed in the dosed reactors. The synergy of NH4(+)-N removal and pH reduction exponentially decreased free NH3 concentration, from 600 to 90mg/L at 43°C, which mitigated ammonia inhibition and improved methane yields by approximately 54%...
February 20, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28254576/effect-of-short-term-alkaline-intervention-on-the-performance-of-buffer-free-single-chamber-microbial-fuel-cell
#15
Na Yang, Yueping Ren, Xiufen Li, Xinhua Wang
Anolyte acidification is a drawback restricting the electricity generation performance of the buffer-free microbial fuel cells (MFC). In this paper, a small amount of alkali-treated anion exchange resin (AER) was placed in front of the anode in the KCl mediated single-chamber MFC to slowly release hydroxyl ions (OH(-)) and neutralize the H(+) ions that are generated by the anodic reaction in two running cycles. This short-term alkaline intervention to the KCl anolyte has promoted the proliferation of electroactive Geobacter sp...
June 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28254029/adsorptive-removal-of-antibiotics-from-water-using-magnetic-ion-exchange-resin
#16
Tianyue Wang, Xun Pan, Weiwei Ben, Jianbing Wang, Pin Hou, Zhimin Qiang
The occurrence of antibiotics in the environment has recently raised serious concern regarding their potential threat to aquatic ecosystem and human health. In this study, the magnetic ion exchange (MIEX) resin was applied for removing three commonly-used antibiotics, sulfamethoxazole (SMX), tetracycline (TCN) and amoxicillin (AMX) from water. The results of batch experiments show that the maximum adsorption capacities on the MIEX resin for SMX, TCN and AMX were 789.32, 443.18 and 155.15μg/mL at 25°C, respectively, which were 2-7 times that for the powdered activated carbon...
February 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28242524/combustion-absorption-process-for-the-separation-of-14-c-and-3-h-in-radwastes-released-from-nuclear-power-plants-and-their-analysis
#17
Young Gun Ko, Chang-Jong Kim, Young Hyun Cho, Kun Ho Chung, Mun Ja Kang
Radioactivities of (3)H and (14)C in spent radioactive ion exchange resins and spent radioactive lubricant oils released from nuclear power plants, has been determined using a combustion and sorption method (combustion method). The liquid scintillation counting (LSC) spectra showed that the interference of other radionuclides has not significantly affected the determination of radioactivities of (3)H and (14)C in the radwaste samples. The chemical structure of (14)CO2, which originated from the combustion of radwastes, trapped (14)C sorbent has been investigated using Fourier transform infrared spectroscopy (FT-IR)...
February 16, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28242203/separation-of-saccharides-from-prehydrolysis-liquor-of-lignocellulose-to-upgrade-dissolving-pulp-mill-into-biorefinery-platform
#18
Guoyu Tian, Yingjuan Fu, Jingshun Zhuang, Zhaojiang Wang, Qun Li
In this work, a competitive process consisting of polyelectrolyte flocculation, active carbon absorption, and ion exchange was developed for hemicelluloses-derived saccharides (HDSs) purification from prehydrolysis liquor (PHL) of lignocellulose. Results showed that colloidal lignin counted for 20% of non-saccharide compounds (NSCs) and could be eliminated by flocculation at 500mg/L polyaluminium chloride and 50mg/L anionic polyacrylamide. Active carbon was very effective for decoloration of flocculation-treated PHL, but showed limited absorption selectivity toward NSCs...
February 10, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28236706/selective-recovery-of-vanadium-and-scandium-by-ion-exchange-with-d201-and-solvent-extraction-using-p507-from-hydrochloric-acid-leaching-solution-of-red-mud
#19
Xiaobo Zhu, Wang Li, Sen Tang, Majian Zeng, Pengyuan Bai, Lunjian Chen
D201 resin and P507 extractant diluted with sulfonated kerosene were used to respectively separate vanadium and scandium, and impurity ions from hydrochloric acid leaching solution of red mud. More than 99% of vanadium was selectively adsorbed from the hydrochloric acid leaching solution under the conditions of pH value of 1.8, volume ratio of leaching solution to resin of 10, and flow rate of 3.33 mL/min. Maximum extraction and separation of scandium was observed from the acid leaching solution at an aqueous pH value of 0...
May 2017: Chemosphere
https://www.readbyqxmd.com/read/28223080/novel-process-combining-anaerobic-aerobic-digestion-and-ion-exchange-resin-for-full-recycling-of-cassava-stillage-in-ethanol-fermentation
#20
Xinchao Yang, Ke Wang, Huijun Wang, Jianhua Zhang, Zhonggui Mao
A novel cleaner ethanol production process has been developed. Thin stillage is treated initially by anaerobic digestion followed by aerobic digestion and then further treated by chloride anion exchange resin. This allows the fully-digested and resin-treated stillage to be completely recycled for use as process water in the next ethanol fermentation batch, which eliminates wastewater discharges and minimizes consumption of fresh water. The method was evaluated at the laboratory scale. Process parameters were very similar to those found using tap water...
February 17, 2017: Waste Management
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