R. Robin, Vinoth Kumar Raja, Rajnish Kumar, G. Arthanareeswaran, Wirach Taweepreda
New Journal of Chemistry · 2023
Nanostructured ZnO/carboxymethyl cellulose nanocomposite-embedded polymer membranes developed for the removal of reactive black 5 (RB5) dye from textile water.
Rianyza Gayatri, Ahmad Noor Syimir Fizal, Erna Yuliwati, Md. Sohrab Hossain, Juhana Jaafar, Muzafar Zulkifli, Wirach Taweepreda, Ahmad Naim Ahmad Yahaya
Nanomaterials · 2023
Polymeric membranes offer straightforward modification methods that make industry scaling affordable and easy; however, these materials are hydrophobic, prone to fouling, and vulnerable to extreme operating conditions. Various attempts were made in this study to fix the challenges in using polymeric membranes and create mixed-matrix membrane (MMMs) with improved properties and hydrophilicity by adding titanium dioxide (TiO2) and pore-forming agents to hydrophobic polyvinylidene fluoride (PVDF). The PVDF mixed-matrix ultrafiltration membranes in this study were made using the non-solvent phase inversion approach which is a simple and effective method for increasing the hydrophilic nature of membranes. Polyvinylpyrrolidone (PVP) and polyethylene glycol (PEG) as pore-forming chemicals were created. Pure water flux, BSA flux, and BSA rejection were calculated to evaluate the mixed-matrix membrane’s efficiency. Bovine serum albumin (BSA) solution was employed in this study to examine the protein rejection ability. Increases in hydrophilicity, viscosity, and flux in pure water and BSA solution were achieved using PVP and PEG additives. The PVDF membrane’s hydrophilicity was raised with the addition of TiO2, showing an increased contact angle to 71°. The results show that the PVDF–PVP–TiO2 membrane achieved its optimum water flux of 97 L/(m2h) while the PVDF–PEG–TiO2 membrane rejected BSA at a rate greater than 97%. The findings demonstrate that use of a support or additive improved filtration performance compared to a pristine polymeric membrane by increasing its hydrophilicity.
Audrey Chai, Yee‐Shian Wong, Soon‐An Ong, Nabilah Aminah Lutpi, Sam Sung Ting, Wirach Taweepreda, Wei-Chin Kee, H.H. Khoo
Bioprocess and Biosystems Engineering · 2023
Jirapornchai Suksaeree, Chanin Bumroongrat, Nantanat Polraksa, Wirach Taweepreda, Thawatchai Phaechamud, Wiwat Pichayakorn
Sustainability · 2023
The non-rubber components present in natural rubber latex can contribute to the dark color of dried films and may cause allergic reactions. This project aimed to develop light-color rubber films with minimal protein contamination. Various additives were incorporated, and a leaching procedure was implemented to address this issue. The evaluation focused on protein content, color changes, and swelling properties of thin natural rubber films. Texapon N70 proved effective as both a latex stabilizer and leaching agent, while Uniphen P-23 served as a preservative. The combined use of these additives facilitated the removal of soluble serum through appropriate incubation, leaching, and centrifugation processes. The introduction of additional centrifugation cycles improved deproteinization and color reduction; however, it led to a loss of rubber mass and an increase in manufacturing costs. Increasing the amount of Texapon N70 and introducing alkali potassium hydroxide (KOH) further enhanced the efficiency of deproteinization and color reduction. The optimal conditions determined in this investigation were as follows: 0.5% w/w Texapon N70, 0.5% w/w KOH, 1% w/w Uniphen P-23, a 60-min incubation period, and a single leaching cycle with distilled water. These conditions resulted in a 90.57 ± 1.20% decrease in protein contamination and a color change (ΔE) of 433.69 ± 20.23. This successful condition can be replicated and scaled up for further applications.
Casmir Ndukaku Anyaegbu, Kingsley Ezechukwu Okpara, Wirach Taweepreda, David Akeju, Kuaanan Techato, Robert Ugochukwu Onyeneke, S. Poshyachinda, Siwatt Pongpiachan
Agriculture · 2022
Across the globe, climate change is threatening the environment, crop yield and food security. The key to ensuring a sustainable environment, crop yield increase and food security is to identify the long-term significant impact of climate change and the means of reducing the effect. This study examined the impacts of climate change on cassava yield in Nigeria. Data were sourced from the Climate Change Knowledge Portal and the Food and Agricultural Organization of the United Nations spanning from 1990 to 2019. The impact of climate change was analyzed using Autoregressive Distributed Lag Bound approach, Error Correction Model and Augmented Dickey–Fuller and Phillips–Perron tests for stationarity test. The model was subjected to diagnostic tests such as stability tests, normality tests, serial correlation tests and heteroscedasticity tests. With the exception of temperature, the study revealed that arable land, rainfall and greenhouse gases such as C2O, nitrous oxide and methane had a long-term significant impact on cassava yield in Nigeria. The study also noted that methane causes long-term significant damage to cassava yield more than any other greenhouse gas and climatic variables in the study. We recommended policies and programs that facilitate the uptake of climate-smart agriculture that centers on greenhouse gas emission reduction and on crop improvement research by breeding crop varieties that will be resilient to climate shocks.
Sujithra Sundarajan, Yohannan Subin Sabilon, G. Arthanareeswaran, Wirach Taweepreda
Desalination and Water Treatment · 2021
ABSTRACT The present study deals with the synthesis of polyetherimide (PEI)-based membrane with zeolitic imidazolate framework (ZIF) nanoparticles as fillers by wet phase technique. The synthesized membranes were characterized based on their physical and chemical properties and were used to study the effective removal of Bisphenol A (BPA) from water. After the BPA removal with different membrane compositions, it was found that 1% PEI/ZIF-8 mixed matrix membrane gave maximum BPA rejection of 94.1% in comparison with other membranes. The flux recovery ratio of 0.92 was also found to be the highest for 1% PEI/ZIF-8 membrane which shows that this membrane has undergone the least fouling when compared to other membrane compositions. Overall, a 1% concentration of PEI/ZIF-8 membrane showed better characteristics and a maximum percentage of BPA removal was obtained.
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