scholarly journals Lead Ions Removal from Natural Water Samples by Nano-Mint Waste as Benign Low Cost Biosorbent

2018 ◽  
Vol 3 (2) ◽  
pp. 116-126
Author(s):  
Tamer H. A. Hasanin ◽  
Salwa A. Ahmed ◽  
Taghreed B. Ebrahim
Keyword(s):  
Natural Water ◽  
Water Samples ◽  
Metal Ion ◽  
Sea Water ◽  
Tap Water ◽  
Low Cost ◽  
Lead Removal ◽  
Lead Uptake ◽  
Natural Water Samples ◽  
Uptake Process

Nano mint waste (NMW) was used as a low-cost nano biosorbent and efficient Pb(II) remover. pH, contact time, biosorbent dose, and concentration of metal ion were optimized using batch technique to optimize maximum capacity of this new biosorbent. NMW was characterized using FT-IR, SEM, TEM, and XRD analyses. The experimental Pb(II) adsorption data by NMW were agreed with both Freundlich and Langmuir models with maximum boisorption capacity of 2.13 mmolg-1 (441.336 mgg-1). In addition, values of lead uptake at different time vaues was best fitted with the kinetic pseudo-second order model. It will be notable that, good data resulted from the kinetic experiments study confirmed a fast accessibility of the Pb(II) to the biosorbent surface, get to equilibrium within 30 seconds. On the other hand, it was observed that, the developed method, was investigated for measuring of Pb(II) with a certain spiked amounts in natural water samples as ground water (GW), sea water (SW), drinking tap water (DTW), natural drinking water (NDW), Nile River water (NRW) and waste water (WW). The good results obtained with high recovered quantitatively using batch experiments, without matrix interferences. Considering its cheap source, environmentally friendly, economic and fast uptake process, NMW can be used as benign nano biosorbent for lead removal from real water samples.

scholarly journals The use of composite sorbents based on nickel ferrocyanide in determination of cesium radionuclides in natural water samples

2019 ◽  
Author(s):  
Keyword(s):  
Chemical Analysis ◽  
Natural Water ◽  
Water Samples ◽  
Sea Water ◽  
Potassium Ferrocyanide ◽  
Natural Water Samples ◽  
Analysis Scheme ◽  
Water Ph ◽  
Static Conditions

The paper presents results of two inorganic sorbents for the cesium selective concentration in the scheme of 137Cs radio/chemical analysis in natural water samples. Nickel/ potassium ferrocyanide dispersed in a zirconium dioxide matrix obtained by the sol/gel method with subsequent drying at 100 ºC (Т-35 sorbent produced by AO “Termoksid”), and nickel/potassium ferrocyanide chemically deposited upon a matrix of hydrated titanium dioxide thermally treated at 400 ºC (NKF-GDT sorbent developed by UrFU). We have shown that in the dynamic conditions NKF-GDT sorbent possesses significantly higher sorption properties in comparison with T-35 in spite of close to similar sorption characteristics in the static conditions. For both sorbents we have shown that the degree of cesium sorption from acidulated sea water (pH = 2) is significantly higher that from neutral or low-alkaline water (pH = 28.2). This can be explained by formation of relatively stable pseudo/radio/colloid forms of cesium at pH = 28.2 that are to be destroyed with the solution acidulation. The authors have stated that NKF-GDT sorbent can be used for 137Cs selective concentration from various types of natural water samples. The radio/chemical analysis scheme has been tested with 7.2 l water sample from the Techa River (ChelyabinskOblast) with addition of 0.1 mg/l of stable cesium for determination of the output with ICP-MS instrument. Total chemical output of cesium in the process of concentration was 91.7 % and specific activity of 137Cs in the sample was 1.36±0.21 Bq/l.

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