摘要
<span style="font-family:Verdana;">Because of various disadvantages of chemical synthesis processes, these</span><span> </span><span style="font-family:Verdana;">days people are attracting towards green synthesis processes as it is devoid of toxic by-products, cost-effective and eco-friendly. In this study, a simple green synthesis method is applied for the synthesis of magnetite (Fe</span><sub><span style="vertical-align:sub;font-family:Verdana;">3</span></sub><span style="font-family:Verdana;">O</span><sub><span style="vertical-align:sub;font-family:Verdana;">4</span></sub><span style="font-family:Verdana;">) nanoparticles (MNPs) by co-precipitation of FeCl</span><sub><span style="vertical-align:sub;font-family:Verdana;">3·</span></sub><span style="font-family:Verdana;">6H</span><sub><span style="vertical-align:sub;font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">O and FeSO</span><sub><span style="vertical-align:sub;font-family:Verdana;">4·</span></sub><span style="font-family:Verdana;">7H</span><sub><span style="vertical-align:sub;font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">O in the molar ratio of 2:1 using </span><span><i></i></span><i><span style="font-family:Verdana;">Azadirachta indica</span><span></span></i><span style="font-family:Verdana;"> leaves extract under nitrogen environment. FTIR, XRD, SEM etc. were used to characterize the synthesized MNPs. Batch adsorption experiments were carried out to determine adsorption equilibrium of As(V) as a function of pH, adsorbent dose, contact time and different initial concentrations. Kinetics results were best describe</span><span style="font-family:Verdana;">d</span><span style="font-family:Verdana;"> by pseudo-second order model with rate constant value 0.0052 g/(mg·min). The equilibrium adsorption isotherm was best fitted with Langmuir adsorption isotherm model. The maximum adsorption capacity was found to be 62.89 mg/g at pH 2. MNPs showed </span><span style="font-family:Verdana;">a </span><span style="font
<span style="font-family:Verdana;">Because of various disadvantages of chemical synthesis processes, these</span><span> </span><span style="font-family:Verdana;">days people are attracting towards green synthesis processes as it is devoid of toxic by-products, cost-effective and eco-friendly. In this study, a simple green synthesis method is applied for the synthesis of magnetite (Fe</span><sub><span style="vertical-align:sub;font-family:Verdana;">3</span></sub><span style="font-family:Verdana;">O</span><sub><span style="vertical-align:sub;font-family:Verdana;">4</span></sub><span style="font-family:Verdana;">) nanoparticles (MNPs) by co-precipitation of FeCl</span><sub><span style="vertical-align:sub;font-family:Verdana;">3·</span></sub><span style="font-family:Verdana;">6H</span><sub><span style="vertical-align:sub;font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">O and FeSO</span><sub><span style="vertical-align:sub;font-family:Verdana;">4·</span></sub><span style="font-family:Verdana;">7H</span><sub><span style="vertical-align:sub;font-family:Verdana;">2</span></sub><span style="font-family:Verdana;">O in the molar ratio of 2:1 using </span><span><i></i></span><i><span style="font-family:Verdana;">Azadirachta indica</span><span></span></i><span style="font-family:Verdana;"> leaves extract under nitrogen environment. FTIR, XRD, SEM etc. were used to characterize the synthesized MNPs. Batch adsorption experiments were carried out to determine adsorption equilibrium of As(V) as a function of pH, adsorbent dose, contact time and different initial concentrations. Kinetics results were best describe</span><span style="font-family:Verdana;">d</span><span style="font-family:Verdana;"> by pseudo-second order model with rate constant value 0.0052 g/(mg·min). The equilibrium adsorption isotherm was best fitted with Langmuir adsorption isotherm model. The maximum adsorption capacity was found to be 62.89 mg/g at pH 2. MNPs showed </span><span style="font-family:Verdana;">a </span><span style="font
