Kinetics of Cd, Co and Ni Adsorption from Wastewater using Red and Black Tea Leaf Blend as a Bio-adsorbent

Abstract

Every year there is deterioration in water quality. This is due to human activity. The current environmental strategies of many countries motivate the scientific community to develop reliable, economically viable and environmentally friendly technologies that are able to remove pollutants from the environment, including water. The study purpose is to determine of influence regularity of the bio-adsorbent composition and amount, which consists of red and black tea leaves mixture, on the Cd, Co and Ni adsorption process based on experimental data. As well as determine the most rational bio-adsorbent dose and the necessary red and black tea dose in bio-adsorbent to achieve MPC of heavy metals, with which process duration will be minimal. Initially, to study the adsorption process kinetics, the nature of the curve that describes the obtained experimental values was visually analyzed. To determine the adsorption process kinetic regularity, which most adequately and reliably describes the experimental data and to determine the values of the coefficients in the exponential regularity, the least squares method was used. It was observed that for Cd and Co, an increase in the black and red tea amount leads to a drastic reduction of the adsorption process time (up to 10 times); while for Ni the black tea addition slows down the adsorption process. Ni adsorption is the most complex and for certain bio-adsorbent composition values, complete Ni removal cannot be achieved in a technologically reasonable adsorption time. The technological process of Cd, Co and Ni adsorption can be expedient, if it is carried out in several stages with optimal red and black tea amounts for each of the metals. Adsorption process kinetic regularity, which was determined, can be used to calculate of adsorption process technological parameters in values wide range.

Efficient elimination of Hg(ii) from water bodies with acid-modified magnetic biomass spent tea leaves: conditional optimization and application

“…S1 (ESI †) reveals that the selected six spent tea leaves exhibited a similar change trend in adsorption capacity at various pyrolysis temperatures. 39,40 Comparatively, the six types of biomass STLs exhibited the minimal adsorption capacity towards Hg(II) when pyrolyzed at 573 K, whereas the maximum capacity at 773 K. Meanwhile, given that the STLs of Maofeng achieved the maximum value of 103.96 mg g À1 towards Hg(II) pyrolyzed at 773 K, the biomass green tea of Maofeng was selected for subsequent experiments.…”

Statistical analysis of Samara River pollution impact on the population morbidity rate in Western Donbas (Ukraine)

“…Many studies have been conducted in order to assess the state of environmental components that are under the excessive influence of anthropogenic load in one or another region, but so far no correlation has been established between indicators of pollution of surface water bodies and disease classes of the population living in the investigated territory [36][37][38][39][40][41][42][43].…”

A Review of the Modeling of Adsorption of Organic and Inorganic Pollutants from Water Using Artificial Neural Networks

“…In particular, it is a proven and well-known technology for water purification due to its both technical and economic advantages [3][4][5][6][7]. The recent advances on adsorption for water treatment have mainly focused on the preparation and evaluation of new materials with outstanding adsorption capacities for the removal of different pollutants like dyes, heavy metals, geogenic compounds, pharmaceuticals, and other emerging toxic chemicals [8][9][10][11][12][13][14][15][16][17][18][19][20]. Actually, there is a wide spectrum of adsorbents that have been prepared and assessed to remove inorganic and organic compounds from aqueous solutions.…”