Deep ocean manganese nodules are significant futuristic resource of copper, nickel and cobalt. After recovery of these valuable metals, a huge quantity of residue (*70 % of ore body) is generated. In the present paper, investigations carried out for the application of washed manganese nodule leaching residue (wMNR) for the removal of nickel (Ni) ions from aqueous solution by adsorption are described. Several parameters have been varied to study the feasibility of using wMNR as potential adsorbent for remediation of Ni(II)-contaminated water. The adsorption kinetics followed pseudo-first-order equation, and the rate of adsorption increased with solution temperature. Kinetics data of Ni(II) adsorption were also discussed using diffusion models of Webber-Morris and Dumwald-Wagner models. The equilibrium data were best fitted into Langmuir adsorption isotherm, and the maximum adsorption capacity was found to be 15.15 mg g -1 at pH 5.5 and temperature 303 K, which decreased to 10.64 mg g -1 upon raising the solution temperature to 323 K. The activation energy for Ni(II) adsorption onto wMNR was 9.56 kJ mol -1 indicated physical sorption. Desorption studies showed successful regeneration of adsorbent and recovery of Ni. This process can be utilized for removal and recovery of Ni from the industrial effluent.

In this review article, we try to cover various studies have been done on 2’-hydroxyacetophenone based schiff bases and formed metal complexes such as Formation with diamine, amino acids etc., antibacterial, antifungal, cytotoxicity, larvicidal, oxidation-reduction and schiff base Formation with different amine group containing compounds etc.

Withania Somnifera (Ashwagandha) is one of the most important ancient medicinal plant of Unani and Ayurvedic system of traditional medicine which is extensively used by tribal people world wide for many ailments. The leaves of the plant are bitter in taste and are applied for carbuncles, inflammation, swellings and conjunctivitis. In the present study phytochemical constituents present in withania somnifera leaf is studied by applying process of extraction and isolation and is analyzed by using TLC and HPLC method. The results show the presence of phytochemical ingredients like withanoside IV, withanoside V + VI, withaferin A, with astramonolide, withanolide A, withanone, withanolide B.

Potentiometric study of multimetal-multiligand complexes of toxic metals Hg(II), Pb(II) and Cd(II) with two different ligands amino acid acts as a neurotransmitter or neuromodulator 2-aminosuccinic acid (2-ASA) and pyramidine base 5-methyluracil (5-MU) at silver-silver chloride electrode forming the binary, ternary and quaternary complexes having great significance for living beings. The protonation constants, stability constants, titration curves and speciation curves were studied by using special computer programme SCOGS and ORIGIN which gives correct and accurate percentage information of the complex formation.

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