Is Fatimah

Adsorption of anionic dyes in aqueous solution using chemically modified barley straw

An agricultural waste derived adsorbent was prepared by chemically modified barley straw with NaOH and a cationic surfactant hexadecylpyridinium chloride monohydrate (CPC). The prepared adsorbent, BMBS, was used for removal of anionic dyes; Acid Blue (AB40) and Reactive Blue 4 (RB4) from aqueous solution in a batch adsorption system. The adsorbent was characterized by FT-IR and elemental composition. The stability of CPC adsorbed on straw surface was also evaluated by exposing to aqueous solution. In adsorption tests, influence of operation parameters such as contact time, initial concentration and pH of solution on AB40 and RB4 uptake were investigated and discussed. The CPC was observed strongly attached to straw surface and removal percentage of AB40 and RB4 was increased with increasing in contact time. The adsorption of dyes on modified straw surface was favorable at high acidic condition and desorption was found relatively low upon exposing to the desorption agent (i.e water). Dynamic experiment revealed that the kinetic data fitted well to the pseudo-second-order model for both of the dyes. The isotherm study also indicated that RB4 and AB40 adsorption suited well with the Langmuir model, The maximum adsorption capacity determined from the Langmuir isotherm at 25 degrees C was 51.95 mg g(-1) and 31.5 for AB40 and RB4, respectively.

Green synthesis of silver nanoparticles using extract of Parkia speciosa Hassk pods assisted by microwave irradiation

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Preparation of ZrO2/Al2O3-montmorillonite composite as catalyst for phenol hydroxylation

Zirconium dispersed in aluminum-pillared montmorillonite was prepared as a catalyst for phenol hydroxylation. The effects of varying the Zr content on the catalyst’s physicochemical character and activity were studied with XRD, BET surface area analysis, surface acidity measurements and scanning electron microscopy before investigating the performance for phenol conversion. The zirconia dispersion significantly affects the specific surface area, the total surface acidity and surface acidity distribution related to the formation of porous zirconia particles on the surface. The prepared samples exhibited excellent catalytic activity during phenol hydroxylation.

Fe(III)/TiO2-Montmorillonite Photocatalyst in Photo-Fenton-Like Degradation of Methylene Blue

A photodegradation process of methylene blue (MB) in aqueous solution using Fe(III)/TiO2-montmorillonite photocatalyst is presented. The photocatalyst material was prepared using Indonesian natural montmorillonite in TiO2 pillarization process followed by Fe(III) ion exchange. Kinetic study on MB degradation was conducted and evaluated by three kinetic models: the pseudo-first- and second-order equations and the Elovich equation. From the results, it is concluded that the degradation under the photo-Fenton-like process utilizing Fe(III)/TiO2-montmorillonite photocatalyst conformed to the Elovich kinetic model.

PREPARATION OF ZIRCONIUM DISPERSED IN ALUMINIUM PILLARED MONTMORILLONITE AND ITS ACTIVITY IN PHENOL HYDROXYLATION

The preparation of zirconia dispersed in aluminium pillared montmorillonite and its application as catalyst in phenol hydroxylation is presented in this paper. Characterization of material by using XRD, DRUV-Vis and Gas Sorption Analyzer (GSA). Its activity in the phenol hydroxylation reaction was investigated. It was observed that prepared material increase significantly the reaction rate. Effect of reaction parameter to the conversion and product selectivity is also presented in this paper.

Chitosan-smectite composite on the urea adsorption–desorption study for slow-release fertilizer application

Purpose The purpose of this study is to prepare composite of chitosan-modified smectite clays consisting of montmorillonite and saponite clay minerals and their urea adsorption–desorption study. Prepared materials were designed for slow-release fertilizer application. Design/methodology/approach Preparation of the composites was conducted by a simple intercalation of chitosan solution and clay suspension followed by hydrogel beads formation. Physicochemical characterization of materials was performed by X-ray diffraction, gas sorption analysis by using Brunauer–Emmett–Teller surface areas and pore volume, water absorbency and Fourier transform-infrared. Urea adsorption and desorption studies of prepared materials were conducted by using batch method, and the adsorbed and desorbed urea content was analyzed by using high-performance liquid chromatography method. Findings The results revealed that the composites have higher absorptivity and lower absorptivity toward urea from and into water solution compared to raw clay minerals. Adsorption capacity and slow desorption rate of urea from the composites suggested the potential application of the composites as slow urea-releasing agent. Originality/value There are many papers that study the formation of chitosan-clay composites, but the study on the urea adsorption–desorption properties based on chitosan-smectite minerals have not been reported. Intensive study related to physicochemical properties and its related kinetics study is an important basic finding for further applications.

Control of wastewater using multivariate control chart

Wastewater treatment is a crucial process in industry cause untreated or improper treatment of wastewater may leads some problems affecting to the other parts of environmental aspects. For many kinds of wastewater treatments, the parameters of Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD), and the Total Suspend Solid (TSS) are usual parameters to be controlled as a standard. In this paper, the application of multivariate Hotteling T2 Individual was reported to control wastewater treatment. By using wastewater treatment data from PT. ICBP, east Java branch, while the fulfillment of quality standards are based on East Java Governor Regulation No. 72 Year 2013 on Standards of Quality of Waste Water Industry and / or Other Business Activities. The obtained results are COD and TSS has a correlation with BOD values with the correlation coefficient higher than 50%, and it is is also found that influence of the COD and TSS to BOD values are 82% and 1.9% respectively. Based on Multivariate control c...

Effect of nitric acid treatment on activated carbon derived from oil palm shell

The primary object of this work is to study the effect of nitric acid on the porous and morphology structure of activated carbon. Production of activated carbon from oil palm shell was prepared with pyrolysis process at temperature 900°C and by introduction of 10 M nitric acid. Determination of surface area, pore volume and pore size distribution of activated carbon was conducted by the N2 adsorption-desorption isotherm at 77 K. Morphology structure and elemental micro-analysis of activated carbon were estimated by Scanning Electron Microscopy (SEM) and energy dispersive X-ray (EDX), respectively. The result shows that activated carbon after treating with nitric acid proved an increasing porous characteristics involving surface area, pore volume and pore size distribution. It also could remove the contaminants including metals and exhibit an increasing of pores and crevices all over the surface.

N-[3-(Trimethoxysilyl)propyl] ethylenediamine Functionalized Saponite as Adsorbent of Nickel from Aqueous Solution

Surface modification of saponite clay by surface functionalization using N-[3(Trimethoxysilyl)propyl]ethylenediamine was performed. This study of the physicochemical characteristics of modified saponite as a function of its functional compound content was investigated using XRD, a gas sorption analyzer, FTIR, TG analysis and SEM. It was observed that the content of N-[3(Trimethoxysilyl)propyl]ethylenediamine increases the basal spacing (d001) of the saponite structure, which changes the specific surface area and surface profile of the solid. The study of nickel adsorption provides evidence of the increased adsorption capacity of the modified saponite. The adsorption follows pseudo-second order kinetics and fits the Langmuir, Temkin and Dubinin-Radushkevich (D-R) adsorption isotherms. Increased content of the modifying agent results in increased adsorption capacity. The material is reusable because regenerated materials retain greater than 90% of the adsorption capacity of fresh material.

Ag/ZnO-smectite as photocatalyst and antibacterial active material

Preparation, characterization and study on photocatalytic and antibacterial activity of silver immobilized ZnO-smectite are reported. The preparation was carried out by saponite pillarization by Zn acetate as Zn precursor followed by silver immobilization at varied concentration 0.3 and 1. XRD, gas sorption analysis, SEM and FTIR analysis were discussed to predict the characteristics of the materials. From photocatalytic testing on rhodamine B and phenol photooxidation and Eschericia coli disinfection it was confirmed that the modifications affect to enhance the character compared to Ag/ZnO.