Influence Factors on Removal of Cadmium by Montmorillonite Supported Nano Zero-Valent Iron

2013 ◽  
Vol 807-809 ◽  
pp. 539-542 ◽  
Author(s):  
Zhi Hua Pang ◽  
Yong Liu ◽  
Jun Luo ◽  
Yu Tao Lei
Keyword(s):  
Removal Efficiency ◽  
Ph Value ◽  
Influence Factors ◽  
Zero Valent Iron ◽  
Initial Concentration ◽  
Nano Zero Valent Iron ◽  
Iron Material

The montmorillonite supported nanozero-valent iron material (MT-NZVI) was synthesized to remove cadmium (Cd). The results showed that the removal efficiency of MT-NZVI on cadmium was much higher than that of montmorillonite (MT), and the removal efficiency of MT-NZVI on cadmium reduced with the increase of the initial concentration and the pH value, but increased with the increase of the dosage.

scholarly journals Bisphenol A degradation by a new acidic nano zero-valent iron diatomite composite

2016 ◽  
Vol 6 (15) ◽  
pp. 6066-6075 ◽  
Author(s):  
Lingya Ma ◽  
Hongping He ◽  
Runliang Zhu ◽  
Jianxi Zhu ◽  
Ian D. R. Mackinnon ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Removal Efficiency ◽  
Zero Valent Iron ◽  
Nano Zero Valent Iron ◽  
Acidic Conditions ◽  
Ph Conditions ◽  
Iron Material

A new nano zero-valent iron material that generates acidic conditionsin situexhibits a high removal efficiency of BPA under natural pH conditions.

Preparation of Sands Modified by Aluminous Salt and its Adsorption Capability of CD2+

2011 ◽  
Vol 130-134 ◽  
pp. 856-859
Author(s):  
Chun Sheng Ding ◽  
Yang Ping Fu ◽  
Qian Fen Zhu ◽  
Jing Fu
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Influencing Factors ◽  
Removal Efficiency ◽  
Specific Surface Area ◽  
Quartz Sand ◽  
Ph Value ◽  
Alkaline Condition ◽  
Initial Concentration ◽  
Adsorption Capability

In this experiment quartz sand was chosen as a carrier to be coated by aluminous salt under alkaline condition, and then the specific surface area was tested, and the adsorption capability and Cd2+ removal influencing factors of modified sand were studied. The investigation results showed that the specific surface area of modified sand was 75.244m2/g which was 9.38 times of that of original sand; the removal efficiency of Cd2+ by aluminous salt modified sand reached 59% contrast to 39% of original sand with pH 7.00. It was also found that the removal efficiency of Cd2+ by the aluminous salt modified sand was reduced with the increase of initial concentration of Cd2+ solution, and was enhanced with the increase of pH value, the Cd2+ removal efficiency was almost 71% with pH 9.0.

Research on Influence Factors of Bamboo Charcoal Adsorb Ammonia Nitrogen in Wastewater

2011 ◽  
Vol 356-360 ◽  
pp. 493-497 ◽  
Author(s):  
Zong Ning Li ◽  
Zong Qiang Zhu ◽  
Mei Na Liang ◽  
Hong Dong Qin ◽  
Yi Nian Zhu
Keyword(s):  
Ph Value ◽  
Influence Factors ◽  
Ammonia Nitrogen ◽  
Bamboo Charcoal ◽  
Solution Ph ◽  
Adsorption Ability ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Adsorption Temperature ◽  
Better Than

The influences of adsorption temperature, adsorption time, dosing quantity, adsorption environment pH value, initial concentration and bamboo charcoal type on adsorption of bamboo charcoal adsorb ammonia nitrogen in wastewater are studied. The result shows that the maximum adsorption values are 1.1715 mg/g and 0.9115 mg/g respectively at 25°C and 40°C. Bamboo charcoal can easily absorb ammonia nitrogen at low temperature condition. 180 min is a suitable adsorption time. Increasing bamboo charcoal dosing quantity is helpful to improve efficiencies of ammonia nitrogen removal in wastewater, but the adsorption capacity is declining as bamboo charcoal dosing quantity increasing. Solution pH value has a great impact on the adsorbed amount, the adsorbed effect in alkaline solution is much better than in acid one’s. The adsorption ability of the moderate temperature bamboo charcoal is higher than the high temperature one’s.

Degradation of bromamine acid by nanoscale zero-valent iron (nZVI) supported on sepiolite

2012 ◽  
Vol 66 (12) ◽  
pp. 2539-2545 ◽  
Author(s):  
Xuening Fei ◽  
Lingyun Cao ◽  
Lifeng Zhou ◽  
Yingchun Gu ◽  
Xiaoyang Wang
Keyword(s):  
Ph Value ◽  
Energy Dispersive Spectrometer ◽  
Zero Valent Iron ◽  
Mass Ratio ◽  
Initial Concentration ◽  
Preparation Conditions ◽  
Transmission Electron ◽  
Nanoscale Zero Valent Iron ◽  
Initial Ph ◽  
Set Up

Sepiolite, a natural nano-material, was chosen as a carrier to prepare supported nanoscale zero-valent iron (nZVI). The effects of preparation conditions, including mass ratio of nZVI and activated sepiolite and preparation pH value, on properties of the supported nZVI were investigated. The results showed that the optimal mass ratio of nZVI and sepiolite was 1.12:1 and the optimal pH value was 7. The supported nZVI was characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) and energy dispersive spectrometer (EDS), and furthermore an analogy model of the supported nZVI was set up. Compared with the nZVI itself, the supported nZVI was more stable in air and possessed better water dispersibility, which were beneficial for the degradation of bromamine acid aqueous solution. The degradation characteristics, such as effects of supported nZVI dosage, initial concentration and initial pH value of the solution on the decolorization efficiency were also investigated. The results showed that in an acidic environment the supported nZVI with a dosage of 2 g/L showed high activity in the degradation of bromamine acid with an initial concentration of 1,000 mg/L, and the degree of decolorization could reach up to 98%.

Study on Treatment of Ammonium Nitrogen in Desulfurization and Denitrification Wastewater with Sodium Hypochlorite

2013 ◽  
Vol 864-867 ◽  
pp. 438-441
Author(s):  
Zhen Zhou ◽  
Da Long Hu ◽  
Chu Qiao Zhang ◽  
Xue Lian Shen ◽  
Chun Hua Wu ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Sodium Hypochlorite ◽  
Ph Value ◽  
Ammonium Nitrogen ◽  
Molar Ratio ◽  
Distillation Method ◽  
Good Reliability ◽  
Initial Concentration ◽  
N Removal ◽  
Effects Of Ph

Based on the investigation of measurement method of ammonium nitrogen (NH4-N) desulfurization and denitrification wastewater (DDW) by distillation method, effects of pH, Cl/N and the initial concentration of NH4-N on the removal of NH4-N in DDW by sodium hypochlorite were studied. Results of parallel test and standard recovery test demonstrated good reliability and accuracy of the distillation method for the measurement of NH4-N in DDW. The NH4-N removal efficiency increased with pH from 5.0 and 8.0, and then decreased with pH higher than 8.0. Therefore, the optimum pH value was 8.0 with NH4-N removal efficiency of 74.7%. NH4-N removal efficiency was increased from 16.9% to 84.1% with Cl/N molar ratio rose from 1 to 5. The initial concentration of NH4-N showed insignificant effect on the removal amount of NH4-N, and the removed NH4-N was about 12~13mg/L with the addition of 4.86mmol/L sodium hypochlorite.

Effect of Activated Attapulgite on Ammonia-Nitrogen Removal

2012 ◽  
Vol 549 ◽  
pp. 92-95
Author(s):  
Fei Liu ◽  
Tao Hu ◽  
Shi Ying Ren ◽  
Ying Ying Shi
Keyword(s):  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Microwave Power ◽  
Ph Value ◽  
Influence Factors ◽  
Ammonia Nitrogen ◽  
Heating Time

The removal of ammonia-nitrogen (NH4+–N) in water by activated attapulgite was investigated. The study focuses on the effect of different activated attapulgite. The influence factors include microwave power, heating time and pH value in solution. The results show that heating 4 minutes, microwave power of 89 watts, and pH value of 9 are the best conditions to remove NH4+-N in the wastewater and the removal efficiency can above 80%. The attapulgite activated by microwave and alkali can remove NH4+-N in breeding waste effectively and the removal efficiency can reach 84.15%.

scholarly journals Study on treatment of acid mine drainage by nano zero-valent iron synergistic with SRB immobilized particles

2020 ◽  
Vol 26 (5) ◽  
pp. 200333-0
Author(s):  
Xianjun Wang ◽  
Junzhen Di ◽  
Bing Liang ◽  
Yu Yang ◽  
Yanrong Dong ◽  
...  
Keyword(s):  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Ph Value ◽  
Zero Valent Iron ◽  
Main Body ◽  
Matrix Component ◽  
Sulfate Reducing ◽  
Acid Mine ◽  
Nano Zero Valent Iron ◽  
Reducing Bacteria

In view of the serious pollution and high cost of treatment of acid mine drainage (AMD) in coal mine, the polyving akohol (PVA) and boric acid embedding cross-linking method was used to prepare the immobilized particles for treatment of AMD with sulfate-reducing bacteria (SRB) and nano zero-valent iron (nano-Fe<sup>0</sup>) as the main body. In order to explore the specification and dosage of each matrix component of immobilized particle, a series of single factor tests and orthogonal tests were carried out to determine the optimal ratio of each matrix component. The results shows that when the SRB quality additive percentage was 30%, the nano-Fe<sup>0</sup> dosage was 4%, the corn cob particle size was 60 mesh and the dosage was 3%, the SO<sub>4</sub><sup>2-</sup>, Cr<sup>6+</sup> and Cr<sup>3+</sup> removal rates were 82.99%, 99.78% and 38.78%, respectively, the TFe and COD release rates were 4.26 mg·L<sup>-1</sup> and 1,033.4 mg·L<sup>-1</sup>, respectively, and the pH value was 8.04, and the treatment effect was the best.

Adsorption of Cesium from Aqueous Solution by Modified Montmorillonite

2013 ◽  
Vol 395-396 ◽  
pp. 591-594
Author(s):  
Si Man Liu ◽  
Yong Zhou Quan
Keyword(s):  
Aqueous Solution ◽  
Adsorption Capacity ◽  
Ph Value ◽  
Influence Factors ◽  
Adsorption Time ◽  
Initial Concentration ◽  
Cesium Ions ◽  
Modified Montmorillonite ◽  
Adsorption Temperature ◽  
As Adsorption

The modified montmorillonite is used to adsorb cesium ions from aqueous solution. The influence factors such as adsorption time, adsorption temperature, adsorption pH, adsorbent dosage and initial concentration was studied in the experiment. The results show the optimum adsorption time is 100 min, the best adsorption temperature is 50 °C, and pH value is 10. When the concentration of cesium ions is 160 mg/L, the adsorption capacity can be up to 9.217 mg/g.

scholarly journals Preparation of Sepiolite Nanofibers Supported Zero Valent Iron Composite Material for Catalytic Removal of Tetracycline in Aqueous Solution

2021 ◽  
Vol 9 ◽  
Author(s):  
Xiaoyu Han ◽  
Hong Zhang ◽  
Caihong Zhang ◽  
Yan Zhao ◽  
Na Zhang ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Active Sites ◽  
Ph Value ◽  
Catalytic Performance ◽  
Aqueous System ◽  
Zero Valent Iron ◽  
High Catalytic Activity ◽  
Catalyst Dosage ◽  
Hcl Removal ◽  
Sepiolite Nanofibers

The heavy use of antibiotics in medicine, stock farming and agriculture production has led to their gradual accumulation in environmental media, which poses a serious threat to ecological environment and human safety. As an efficient and promising catalyst for the degradation of antibiotics, nanoscale zero valent iron (nZVI) has attracted increasing attention in recent years. In this study, sepiolite nanofiber supported zero valent iron (nZVI/SEP) composite was prepared via a facile and environmentally friendly method. The nZVI particles (with size of 20–60 nm) were dispersed evenly on the surface of sepiolite nanofibers, and the catalytic performance for the removal of tetracycline hydrochloride (TC-HCl) in aqueous system was investigated. The effect of nZVI loading amount, catalyst dosage, H2O2 concentration and pH on the removal efficiency of TC-HCl were studied. It was revealed that the sepiolite supporter effectively inhibited the agglomeration of nZVI particles and increased the contact area between contaminant and the active sites, resulting in the higher catalytic performance than pure nZVI material. The TC-HCl removal efficiency of nZVI/SEP composite was up to 92.67% when TC-HCl concentration of 20 mg/L, catalyst dosage of 1.0 g/L, H2O2 concentration of 1.0 mM, pH value of 7. Therefore, the nZVI/SEP composites possess high catalytic activity for TC-HCl removal and have great application prospects in antibiotic wastewater treatment.

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