Nabilah Lutpi | Universiti Malaysia Perlis (UniMAP) (original) (raw)

Papers by Nabilah Lutpi

The objective of this study is to investigate the fire retardancy effect of coconut coir, rice hu... more The objective of this study is to investigate the fire retardancy effect of coconut coir, rice husk and sawdust panels which are incorporated with magnesium hydroxide (Mg(OH) 2 ) and zinc borate (2ZnO·3B 2 O 3 ·3.5H 2 O) as additives. The natural fiber and additives are mixed and cured for one week, with polyester resin and hardening catalyst as binders. Fire retardancy of these panels are tested according to American Society for Testing and Materials (ASTM) Horizontal (D 365) and Vertical Burning (D 3801) tests. Principle of fire retardants and mechanism of polymer combustion are shown in this study too. The study revealed that the sawdust panels with both additives have the highest fire retardancy compared to rice husk and coconut coir panel with both additives.

Zinc(Zn) is one of the environmental pollutants and is toxic even at very low concentrations. Dom... more Zinc(Zn) is one of the environmental pollutants and is toxic even at very low concentrations. Domestic and industrial discharges are probably the two most important sources for zinc in the water environment. There is still facing problems of heavy metal discharges into natural ecosystems by factories and household without any prior treatment. Therefore, the general objective of this study is to investigate on the removal of Zn from the wastewater by using lateritic soil. The investigation had been conducted based on the heavy metals commonly found in polluted industrial wastewater which is Zn (II). Different parameters were studied in this research such as effects of pH, dosage of the lateritic soil, time of reaction needed between zinc and lateritic soil and the concentration of the Zn molarity. Based on the experiment, the removal of zinc is increased with the increment of contact time. Besides that, removal of zinc increased if the solution of ZnSO 4 is more to acidic pH and also increased with the increment of the concentration of stock solution (ZnSO 4 ). However, the removal of zinc is decreased with higher dosage of lateritic soil.

An incentive to investigate the mineralogy of three types of tropical mineral soil was carried ou... more An incentive to investigate the mineralogy of three types of tropical mineral soil was carried out in this study to identify whether that the chemical properties of those tropical mineral soil are suitable for use as a sorbent in the carbonation process. The main purpose of this study is to evaluate the characteristics of the suitable tropical mineral soil at different parameter such as temperature, mixing speed, contact time, pH, particle size, and flow rate of carbon dioxide. In fact, there were two parts of experiment that had been investigated. The first part of experiment was alkalinity studies whereby the intensity of carbonate and hydroxide ions presence in the tropical mineral soil was determined. The second part of experiment was batch absorption studies whereby the absorption of carbon dioxide can be used to determine how effective those gases affecting the tropical mineral soil.

The adsorption of methylene blue on pineapple peel powder was studied on batch modes of operation... more The adsorption of methylene blue on pineapple peel powder was studied on batch modes of operation. The operation parameters investigated including initial dye concentration, contact time, pH of solution (2-12), and adsorbent dose (1-5g/L). The experimental data were analyzed using Langmuir and Freundlich isotherm model. The Langmuir isotherm model fits the data very well for the methylene blue on pineapple peel powder. Pseudo-first-order and pseudo-second-order kinetic were used to analyze the kinetic data. Kinetic studies showed that the adsorption followed a pseudo-second-order model. The pseudo-second-order kinetic data fit well on whole system for the dye studies.

Mineral block are common supplement food sources of ruminants animals that usually use by farmer.... more Mineral block are common supplement food sources of ruminants animals that usually use by farmer. It can be found either in the wild or through solidification process. The aim of this study is to enhance utilization of these supplement food sources to small farmer and to eliminate the usage of cement as binder in mineral block composition with the substitution of potato starch. Generally, in this study the mineral block were prepared from mixer of the mineral sources and built in block condition through solidification process. The mineral sources were characterized using characterization techniques. Then the mineral sources that stand by fermentable energy sources and fiber sources that come from agroindustrial byproduct were mixed with potato starch to form mineral block composition. These mineral block composition were further heated under controlled conditions to dry the moisture in the composition and to form gelatinization of starch to make it bind all the composition. The physical and chemical properties of this mineral block were characterized by characterization technique. Therefore, mineral block may be considered as an alternative to promote intensive use of agroindustrial byproduct and overcome nutritional constraints.

Red mud is a by-product in alumina refineries that are verified as hazardous and caustic due to t... more Red mud is a by-product in alumina refineries that are verified as hazardous and caustic due to the high pH of 10-13. An incentive to treat the red mud residue was applied in this study by utilize it as economical adsorbent for the removal of CO2 emissions. The study was carried out using a laboratory-scale reactor to investigate the batch absorption of CO2 gaseous with red mud samples from Worsley Alumina Pty. Ltd., Western Australia. In fact, there were two parts of experiment that had been investigated. The first part of experiment was alkalinity studies whereby the intensity of carbonate and hydroxide ions presence in the red mud was determined. The second part of experiment was batch absorption studies whereby the absorption of carbon dioxide can be used to determined how effective those gases in neutralizing the red mud. Some findings of the studies are, the hydroxide and carbonate ions are assumed to be consumed at specific pH of the sample's alkalinity, taking into consideration the fact that hydroxide is commonly present at pH levels greater than 8.3, while carbonate is present at pH between 4.5 and 8.3. Analysis from the batch absorption studies shows that longer time required for CO2 to neutralize the red mud samples at larger dosage.

An incentive to investigate the mineralogy of red mud after the reaction with SO 2 was carried ou... more An incentive to investigate the mineralogy of red mud after the reaction with SO 2 was carried out in this study to identify whether that the chemical properties of red mud are suitable for use as a sorbent in the flue gas desulphurisation process. The main purpose of this study is to evaluate how SO 2 gas affects the minerals in solid and liquid phase of the red mud at different contact time. Red mud samples from Worsley Alumina Pty. Ltd.(WAPL), Western Australia were used in this study and were examined using XRD, XRF and ICP analysis to identify the changes in the red mud composition. From the XRD analysis, WAPL red mud prior to reaction with SO 2 implied that it was mainly composed of goethite, hematite, aluminium silicate, potassium magnesium hydrogen aluminium silicate hydrate, and sodium titanium silicate. However, after the reaction between red mud and SO 2 , it is observed that goethite is the dominant mineral while other minerals were fluctuates over time. This scenario is different for the XRF analysis whereby main constituent of the treated red mud is hematite. This is followed by alumina, quartz, and anatase while the rest of elements present comprise < 1.0%. However, the ICP analysis of treated red mud at different contact time implies that there are six main elements (Na, Al, S, K, Ca, P) which are most highly concentrated in the liquid phase of red mud, while other elements (Co, Cu, Fe, Ga, Mg, Mn, Ti, Zn) disappeared into the solid phase, explaining why only trace amounts of them were detected in the liquor.

Anaerobic pond system is particularly effective in treating high strength wastewater containing b... more Anaerobic pond system is particularly effective in treating high strength wastewater containing biodegradable solids as they achieve the dual purpose of particulate settlement and organic removal. The POME mainly contains of high content of degradable organic matter was ...

The main purpose of this study was to investigate for SO 2 removal using red mud as sorbent in la... more The main purpose of this study was to investigate for SO 2 removal using red mud as sorbent in laboratory for the sake of gas cleaning. The study was carried out by using a laboratoryscale reactor to examine the batch absorption study of SO 2 gas with slurry and liquor of red mud samples from Worsley Alumina Pty. Ltd., Western Australia. The intention of the batch absorption study is not only constrain for gas cleaning of SO 2 using red mud, but this study also revealed how effective the sulfur dioxide in neutralizing the red mud which are verified as hazardous and caustic due to the high pH of 10-13. Prior to the absorption study, the red mud needs to undergo for alkalinity test to determine the intensity of carbonate and hydroxide ions presence in the red mud. From the experiment, the hydroxide and carbonate ions are assumed to be consumed at specific pH of the sample's alkalinity, taking into consideration the fact that hydroxide is commonly present at pH levels greater than 8.3, while carbonate is present at pH between 4.5 and 8.3. In other hand, analysis from the batch absorption studies exhibited good performance of red mud as sorbent with respect to sulfur capacity.