Mohd Razman Salim

Bio: Mohd Razman Salim is an academic researcher from Universiti Teknologi Malaysia. The author has contributed to research in topics: Membrane & Sewage treatment. The author has an hindex of 28, co-authored 115 publications receiving 3549 citations. Previous affiliations of Mohd Razman Salim include Universiti Malaysia Sabah & Yahoo!.

A Review of Silver Nanoparticles: Research Trends, Global Consumption, Synthesis, Properties, and Future Challenges

Abstract: Silver nanoparticles (AgNPs) are intensively investigated for their superior physical, chemical, and biological properties. A proper knowledge of these properties is essential to maximizing the potential applications of AgNPs in several areas while minimizing their risks to humans and the environment. This paper aims to critically review AgNPs from the perspectives of research trends, global consumption, synthesis, properties, and future challenges. Generally, AgNPs can be synthesized using three methods, namely physical, chemical, and biological, and the related works as well as their numerous advantages and disadvantages are presented in this review. In addition, AgNPs can be potentially explored for various applications. Future challenges on (AgNP) synthesis, their release into the environment, and scaling up production, as presented in the review, suggest that several potential topics for future works are available to promote a safer and more efficient use of these nanoparticles. Studies on AgNPs in Malaysia have increased since the Malaysian government officially established a directorate for nanotechnology development. This calls for a proper set of policies on AgNPs starting from their production to utilization as well as their effects on various related industries and the environment.

Laccase immobilization on cellulose nanofiber: The catalytic efficiency and recyclic application for simulated dye effluent treatment

Abstract: In this study, laccase immobilized on cellulose nanofiber was utilized for reactive dyes and simulated dye effluent (SDE) decoloration. The thick coating on the fiber in the scanning electron microscopy (SEM) analysis and the N H stretching vibration between 1560 and 1640 cm−1 in the Fourier-transform infrared spectroscopy (FT-IR) spectra confirmed the laccase immobilization on nanofiber. The relative activity of the immobilized laccase was found to be 88%. The thermal and pH stability of the immobilized laccase was considerably improved. The best mediator for all of the reactive dyes that were tested and the SDE decoloration is 1-hydroxybenzotriazole (HBT). Response surface methodology (RSM) was used to improve the SDE decoloration. The half-life of the immobilized laccase was retained for up to 8 cycles and had greater than 85% SDE decoloration for up to 5 cycles. Therefore, laccase immobilized on cellulose nanofiber may be a good candidate for the textile effluent decoloration.

Properties Of Concrete

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