Modified Moringa oleifera Lam. Seed husks as low-cost biosorbent for atrazine removal

2019 ◽  
pp. 1-12 ◽  
Author(s):  
Luís Fernando Cusioli ◽  
Charleston de Oliveira Bezerra ◽  
Heloise Beatriz Quesada ◽  
Aline Takaoka Alves Baptista ◽  
Letícia Nishi ◽  
...  
Author(s):  
Affonso C. Gonçalves Junior ◽  
Ana P. Meneghel ◽  
Fernanda Rubio ◽  
Leonardo Strey ◽  
Douglas C. Dragunski ◽  
...  

This study evaluated the efficacy of moringa seeds (Moringa oleifera Lam.) as an adsorbent material for removing toxic heavy metals such as cadmium, lead, and chromium from contaminated solutions. The effect of the adsorbent mass was investigated at two pH conditions (5.0 and 7.0). The optimized conditions were 0.300 g of adsorbent at pH 5.0, used for the isotherms construction, and linearized according to Langmuir and Freundlich models. Results showed that cadmium adsorption was similar in both the models used. For lead, the Freundlich model had the best adjustment and chromium was better adjusted by the Langmuir model. It was concluded that the adsorbent was effective in the remediation of solutions containing cadmium, lead and chromium, thus, its use as sustainable alternative material is feasible, since it has low cost, does not need a previous treatment and it is a byproduct.


Author(s):  
Maiara Luzia Grigoli OLIVIO ◽  
Elizângela Flávia Jacob ESTEVES ◽  
Dagmar Aparecida de Marco FERRO

Comumente o sulfato de alumínio é o coagulante químico utilizado nas Estações de Tratamentos para a clarificação da água, embora produza um lodo tóxico de difícil deposição no ambiente. No entanto, os coagulantes naturais como sementes de Moringa oleífera Lam. têm demonstrado vantagens para tratamento em comparação aos químicos, pela simplicidade de uso e baixo custo. O estudo objetivou analisar a eficiência coagulante da semente de Moringa oleífera na clarificação de água com turbidez e comparar com os parâmetros do coagulante químico sulfato de alumínio. As amostras de água foram coletadas no Córrego Jacu Queimado e as sementes colhidas em um plantio da própria espécie. Foram realizados, em laboratório, etapas sequenciais do experimento: comparação da eficiência da semente verde e seca, determinação da concentração e tempo de exposição da semente à água, comparação de agitação manual e magnética entre elas e do coagulante biológico com o químico, sendo analisados os aspectos físico, químico e biológico antes e após a adição de ambos. Observou-se que apenas a semente seca realiza a clarificação da água em comparação com os resultados das análises da água clarificada com o sulfato, determinando-se que 5 sementes são eficazes para tratar 1 litro de água com turbidez de até 25,0 NTU, considerando-se mais relevante a agitação manual para o efeito de coagulação e o aguardo de 2 horas para o término da decantação. Conclui-se, que a semente de Moringa é um coagulante biológico que se apresenta como alternativa para o tratamento de água com turbidez, porém, ainda não é indicada para a potabilidade. É preciso dar continuidade ao tratamento em busca de processos que visam melhorar a qualidade da água para aproximar-se aos parâmetros aceitáveis para o consumo humano.   Moringa oleífera Lam SEEDS: EFFICIENT USE OF BIOLOGICAL COAGULANT FOR WATER TURBIDITY TREATMENT, COMPARED TO ALUMINUM SULFATE CHEMICAL COAGULANT   ABSTRACT Aluminum sulfate is a chemical coagulant commonly used at Water Treatment Plants for water clarification, although it produces a toxic sludge of difficult deposition in the environment. However, natural coagulants such as Moringa oleíferaLam seeds have evidenced the advantages for the treatment when compared to chemicals, due to either their simplicity in and low cost.  This research aims at reviewing the efficient use of   Moringa oleífera seeds as coagulants for turbid water clarification as well as comparing the parameters of aluminum sulfate chemical coagulants. The water samples were collected at Córrego Jacu Queimado and the seeds were harvested from a crop of its own species. Sequential steps were performed in the lab for this experiment: Comparison of green and dry seeds efficiency, concentration and time of exposition of the seed to water measurements, comparison of manual and magnetic stirring among them and among biological and chemical coagulants, being analyzed physical, chemical and biological aspects before and after adding both of them. It was observed that only the dry seed enables water clarification when comparing the analysis results to sulfate water clarification, it was ascertained that 5 seeds are efficient to treat a liter of 25,0 NTU turbidity in water, considering as more relevant manual stirring for coagulation effect after a two-hour rest for decantation completion. It was concluded that Moringa seed is a biological coagulant presented as an alternative for turbid water treatment, although it is not indicated for drinkability. Further treatment is necessary in order to keep searching for processes that target to improve the quality of water and meeting acceptable parameters for water consumption.   Keywords: Biological Coagulant. Chemical Coagulant. Efficiency. Water Clarification. Comparative Parameters.


2019 ◽  
Vol 94 (10) ◽  
pp. 3147-3157 ◽  
Author(s):  
Heloise B Quesada ◽  
Luís Fernando Cusioli ◽  
Charleston O Bezerra ◽  
Aline TA Baptista ◽  
Leticia Nishi ◽  
...  

2013 ◽  
Vol 69 (1) ◽  
pp. 163-169 ◽  
Author(s):  
Ana Paula Meneghel ◽  
Affonso Celso Gonçalves ◽  
César Ricardo Teixeira Tarley ◽  
José Renato Stangarlin ◽  
Fernanda Rubio ◽  
...  

The efficiency of Moringa (Moringa oleifera Lam.) seeds for removing lead ions (Pb2+) from water was evaluated. Parameters such as solution pH, adsorbent mass, contact time between solution and adsorbent, isotherms, thermodynamic, kinetics, and desorption were evaluated. The maximum adsorption capacity of the biosorbent was found to be 12.24 mg g−1. In order to verify the effectiveness of this material, comparative studies were performed with activated carbon under the same optimal conditions for the construction of isotherms and the desorption process. Average desorption rate values led to the assumption that a strong interaction took place between the adsorbents and the metal ions. Thus, it has been concluded that the biosorbent studied herein can be considered very effective and feasible for remediating Pb2+-contaminated solutions, since this material is itself an untreated and low-cost byproduct.


2021 ◽  
Vol 10 (21) ◽  
pp. 1628-1632
Author(s):  
Nisha Rani Yadav ◽  
Meena Jain ◽  
Ankur Sharma ◽  
Aparna Aggarwal ◽  
Meetika Pahuja ◽  
...  

BACKGROUND Moringa oleifera Lam is a plant found in Himalayan foothills. A large corpus of literature exists about moringa and its medicinal values. Various medicinal and health properties of moringa make it a part of various phytomedicinal preparation.It is used as a part of routine diet and has anti-fibrotic, anti-inflammatory, antimicrobial, antioxidant, anti-hyperglycaemic and anti-tumour properties. It is also used in production of seed oil, fodder and medicine. It is highly useful as a nutritional supplement, in the management of various diseases and in the management of public health problems. Moringa oleifera Lam is an important part of South Indian diet. Its antibacterial properties were found to be effective against E. coli, Salmonella typhi and Shigella dysenteriae. Hence, it may be used as a low-cost material for water purifications in poor communities. This plant has significance in dental health due to its antimicrobial effect on bacteria present in dental plaque like Staphylococcus aureus and Streptococcus mutans. There has been limited research on efficacy and safety of various Moringa oleifera (MO) extracts and parts in oral healthcare. MO has found its applications in various aspects of public health. As a plant with high nutritional value and relatively low cost, it has been endorsed as a plant with immense potential as for use as nutrient supplement in the parts of the world with widespread malnutrition and nutritional deficiencies. Further research needs to be conducted in the field of pharmacological management and prevention of oral disease. KEY WORDS Antimicrobial, Dental Diseases, Moringa oleifera, Streptococcus mutans.


2017 ◽  
Vol 6 (10) ◽  
pp. 5535
Author(s):  
Sachin Umesh Dubey ◽  
Madhu Kanta Kapoor

Moringa oleifera Lam., commonly found tree in sub-Himalayan tracts of India, Pakistan, Bangladesh and Afghanistan has a high nutrition value. The leaves, flowers and immature pods of Moringa are used as a vegetable in many countries. The leaves are highly nutritious and medicinal in nature. They are a rich source of iron, calcium, vitamin A, vitamin C, proteins, and essential amino acids. Hence Moringa leaves can be a good source of protein for the vegetarians and the under-nourished population. Present investigation deals with the study of monthly variation in the nutritional value of Moringa leaves from the month of June 2015 to January 2016. Impact of urban sewage pollution and roadside vehicular pollution on the amount of reducing and total sugars, chlorophylls (a, b and total), proteins, vitamin-C and pH of the leaves, was also studied. Results revealed that the highest amounts of reducing sugars, total sugars, chlorophyll b and total chlorophyll during October 2015 whereas proteins, chlorophyll a, vitamin C and pH were highest during January 2016. Leaf samples collected from all the study sites exhibited minimum amounts of reducing sugars, chlorophylls (a, b and total) and pH during July 2015 whereas total sugars were lowest during December 2015. Proteins and vitamin C values were lowest during August and June 2015 respectively. Sewage and vehicular pollution showed an adverse effect on the nutritional contents of Moringa oleifera leaves. Of the two polluted sites, samples from near the sewage flow showed higher impact.


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